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Optical receiver scheme with all-optical decision element

Patent Number: 8112005
Publication Date: 2012-02-07
Inventors: Ghelfi, Paolo; Bogoni, Antonella; Poti, Luca; Scaffardi, Mirco

A receiver scheme for optical signals in Return-to-zero (RZ) systems comprises a conventional receiver at the input of which is placed an all-optical decision element realized with nonlinear optical elements. This allows obtaining a substantial increase in performance compared with a simple conventional receiver optimized for NRZ signals. In particular, an optical decision is made up advantageously of two non-linear optical loop mirrors (NOLMs) arranged in cascade with an optical amplifier ...

Optical receiver implemented with dual electronic dispersion compensators

Patent Number: 8112004
Publication Date: 2012-02-07
Inventor: Ishibashi, Hiroto

An optical receiver implemented with two electronic dispersion compensators (EDC) is disclosed. The optical receiver selects one of the EDC in an ordinary operation. Once there shaped signal compensated by the selected EDC is degraded due to irregular conditions of the optical transmission line, the optical transmitter and so on, the optical receiver reconfigures the tap coefficients of the unselected EDC and switches to the newly configured EDC after setting the tap coefficients for the ...

Optical transmitter, operation controlling method for the same, and recording medium

Patent Number: 8112003
Publication Date: 2012-02-07
Inventor: Kozato, Atsushi

An optical transmitter according to an exemplary aspect of the present invention is an optical transmitter that includes a variable-wavelength light source and a modulator for modulating and outputting the output light of the variable-wavelength light source in accordance with data to be transmitted, wherein the optical transmitter includes a control unit for varying the bias voltage of the modulator based on the light output power of the modulator to make feedback control of the light ...

Transmitting circuit and complementary optical wiring system

Patent Number: 8112002
Publication Date: 2012-02-07
Inventors: Furuyama, Hideto; Uemura, Hiroshi

A transmitting circuit has a first transmitter configured to generate a first electric pulse signal in synchronization with a rising edge of a digital electric input signal, a second transmitter configured to generate a second electric pulse signal in synchronization with a falling edge of the digital electric input signal, a first variable impedance circuit configured to supply a bias current to a first light-emitting element only for a predetermined period before the first light-emitting ...

Non-linearity compensation in an optical transmission

Patent Number: 8112001
Publication Date: 2012-02-07
Inventors: Lowery, Arthur James; Du, Liang Bangyuan

A method of transmitting information over a non-linear optical channel includes the step (152) of generating an information-bearing signal, preferably an OFDM signal, which includes a plurality of closely-spaced sub-carriers in the frequency domain. A time-varying phase modulation is determined (154), which is a first function, and preferably a linear function, of the transmitted optical power corresponding with the information-bearing signal. The information-bearing signal ...

Electronic device

Patent Number: 8112000
Publication Date: 2012-02-07
Inventors: Matsubara, Kenta; Kito, Eiichi; Nishino, Naoyuki; Ohta, Yasunori

An electronic device includes a casing having a laser light reception region on its outer surface, a receiver that receives transmission data from a partner device, and a suppression member that suppresses leakage of the laser light between the partner device and the electronic device. The partner device includes a laser light emission component and a laser light modulator. The receiver detects, in a state where the partner device and the electronic device are positioned in to communicable ...

Inter-transceiver module communication for firmware upgrade

Patent Number: 8111999
Publication Date: 2012-02-07
Inventors: Hahin, Jayne C.; Dybsetter, Gerald L.; Ekkizogloy, Luke M.; Hosking, Lucy G.

An operational optical transceiver configured to update operational firmware using an optical link of the transceiver. The optical transceiver includes at least one processor and a system memory capable of receiving firmware. The optical transceiver receives an optical signal over the optical link containing the update firmware. The optical transceiver then recovers the firmware from the optical signal. Finally, the optical transceiver provides to the system memory the recovered firmware, ...

Transponder systems and methods for radio-over-fiber (RoF) wireless picocellular systems

Patent Number: 8111998
Publication Date: 2012-02-07
Inventors: Sauer, Michael; George, Jacob; Kobyakov, Andrey

Transponder systems and methods for radio-over-fiber (RoF) wireless picocellular system are disclosed. One type of transponder system includes a RoF transponder used in combination with at least one radiation-reflector assembly to provide for enhanced antenna directivity of the transponder. Another type of transponder system is a transponder node assembly, wherein two or more transponders are integrated into a single assembly, thereby reducing cost while facilitating RoF wireless ...

Multiple movable barrier operator system and method

Patent Number: 8111997
Publication Date: 2012-02-07
Inventor: Butler, Brian Frederic

A first moveable barrier operator is actuated to move a first moveable barrier and a light beam is encoded with operational information regarding the first movable barrier operator. The encoded light beam is transmitted from an emitter associated with the first moveable barrier operator to a first detector associated with the second moveable barrier operator. The second moveable barrier operator may be subsequently operated at least in part according to the operational information encoded ...

Compact optical multiplexer and demultiplexer

Patent Number: 8111996
Publication Date: 2012-02-07
Inventors: Nagarajan, Radhakrishnan L.; Evans, Peter W.; Kato, Masaki; Joyner, Charles H.

Consistent with the present disclosure, an arrayed waveguide grating (AWG) is provided that includes first inputs and second inputs. Each of the first inputs receives a corresponding one of a plurality of first optical signals, each of which has a corresponding one of a plurality of wavelengths. Second inputs are also provided, such that each second input is preferably provided between two adjacent first inputs. Each of the second inputs receives a corresponding one of a plurality of second ...

Shared, colorless add/drop configuration for a ROADM network using M×N wavelength switches

Patent Number: 8111995
Publication Date: 2012-02-07
Inventor: Wisseman, Philip

A system and method for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network is disclosed. The system includes a plurality of M×N wavelength selective switches (WSS) for locally dropping selected wavelengths at a node, where each M×N WSS has M inputs connected to optical fan-out devices in each of M network degrees, and a plurality of M×N wavelength selective switches for locally adding selected wavelengths to a node, where ...

Balanced bypass circulators and folded universally-balanced interferometers

Patent Number: 8111994
Publication Date: 2012-02-07
Inventor: Popovic, Milos

The invention generally relates, in one aspect, to an interferometer system. The interferometer system includes a splitter/combiner element (SCE), a first bi-directional optical path, and a second bi-directional optical ...

Methods and apparatus for optical transmission of digital signals

Patent Number: 8111993
Publication Date: 2012-02-07
Inventors: Armstrong, Jean; Lowery, Arthur James

A system (100) for transmitting digital information includes a transmitting apparatus (102) for generating an optical signal bearing digital information, a dispersive optical channel (104), and a receiving apparatus (110) for receiving the optical signal. The dispersive optical channel (104) is disposed to convey the optical signal from the transmitting apparatus (102) to the receiving apparatus (110). The transmitting apparatus includes an ...

Amplified wavelength broadband video distribution architectures

Patent Number: 8111992
Publication Date: 2012-02-07
Inventors: Chen, Yihong; Sweeney, Kevin L.; Villarruel, Fernando X.; Condra, Steven C.; Sulhoff, James W.

Provided herein are embodiments of a device, method of use and system for a low-cost analog multi-wavelength video distribution transamplifier for CATV and FTTH networks having a broadband overlay. The transamplifier embodiments described herein allow the use of multiple wavelengths to segment logical service groups in a CATV distribution system and a FTTH system having a broadband ...

N-way broadcast / narrowcast combiner

Patent Number: 8111991
Publication Date: 2012-02-07
Inventors: Barker, Charles; Pradzynski, Krzysztof

Systems and methods are described for an optiplex. A method includes: conveying a first narrowcast signal to a first optical combiner; conveying a second narrowcast signal to a second optical combiner; tapping into said first narrowcast signal; monitoring a first characteristic of said first narrowcast signal; tapping into said second narrowcast signal; monitoring a second characteristic of said second narrowcast signal; combining a broadcast signal with the first narrowcast signal using ...

Apparatus for transferring optical data in optical switching system using time synchronization

Patent Number: 8111990
Publication Date: 2012-02-07
Inventors: Kang, Min Ho; Kim, Ji Hwan; Choi, Jung Yul; Rhee, June Koo

Provided is an apparatus for transferring optical data in an optical switching system using time synchronization. The apparatus performs time synchronization on optical data to input the optical data at regular intervals through fiber delay line for time synchronization respectively disposed on input ports. Therefore, the apparatus can efficiently reduce a data blocking rate in comparison with a conventional optical switching system using an asynchronous electric buffer without a ...

Optical switch and optical signal communication system

Patent Number: 8111989
Publication Date: 2012-02-07
Inventors: Hsu, Dar-Zu; Yang, Chun-Liang; Hong, Jian-Ting

An optical switch including a first reversible optical circulator and a second reversible optical circulator is provided. Each of the first reversible optical circulator and the second reversible optical circulator respectively has four I/O ports, wherein the four I/O ports are respectively a first terminal, a second terminal, a third terminal, and a fourth terminal, the four terminals sequentially transmit an optical signal in a forward circulation or a backward circulation according to a ...

Method for monitoring wavelength-division multiplexed signal

Patent Number: 8111988
Publication Date: 2012-02-07
Inventors: Schantz, Howard J.; Uhlhorn, Brian L.

A method for monitoring wavelength-division multiplexed (WDM) signal for detecting signal drift of objective signals, including generation of one or more objective signals and a guard signal. The guard signal has a wavelength that is within a range defined by a guard channel. The first and second objective signals and the guard signal are wavelength-division multiplexed to generate a wavelength-division multiplexed signal. The first objective signal, the second objective signal, and the ...

Rogue ONU detection via photonic mixing

Patent Number: 8111987
Publication Date: 2012-02-07
Inventors: Teeter, Jason; Baghdadi, Jihad; Dalton, Rodger

A system, method, and computer readable medium for rogue Optical Network Unit (ONU) detection via photonic mixing, comprises a first Wavelength Division Multiplexer (WDM), a second WDM communicably coupled to the first WDM, a non-linear medium communicably coupled to the second WDM, and a photodetector communicably coupled to the non-linear medium, wherein the first WDM transmits a first upstream beam and a second upstream beam to the second WDM, wherein the first upstream beam is a normal ...

Testing of transmitters for communication links by software simulation of reference channel and/or reference receiver

Patent Number: 8111986
Publication Date: 2012-02-07
Inventor: Lindsay, Thomas A.

A transmitter for a communications link is tested by using a (software) simulation of a reference channel and/or a reference receiver to test the transmitter. In one embodiment for optical fiber communications links, a data test pattern is applied to the transmitter under test and the resulting optical output is captured, for example by a sampling oscilloscope. The captured waveform is subsequently processed by the software simulation, in order to simulate propagation of the optical signal ...

Apparatus and method for performing line analysis of continuous data signals

Patent Number: 8111985
Publication Date: 2012-02-07
Inventors: Goldstein, Alex; Dvir, Amiad; Avishai, David

An apparatus for performing an optical line analysis of continuous data signals. The apparatus comprise a phase position processor for computing a phase early/late indicator; a phase control code processor for computing a difference phase indicator; a frequency extractor for computing a low frequency jitter indicator; and a statistical calculator for computing a plurality of statistical measures regarding frequency and amplitude components of a jitter of an input continuous data signal, ...

Method and apparatus for reception of optical signals

Patent Number: 8107827
Publication Date: 2012-01-31
Inventors: Armstrong, Jean; Lowery, Arthur James; Schmidt, Brendon James

An apparatus and method are provided for receiving an optical signal having an optical carrier component and at least one information-bearing optical sideband. In general, an optical filter arrangement (110) is used to separate the optical carrier component from the information-bearing optical sideband. First and second optical splitters (126, 128) divide the optical power in the optical carrier and the optical sideband, respectively, into corresponding sub-components. The ...

Methods and apparatus for optical transmission of digital signals

Patent Number: 8107826
Publication Date: 2012-01-31
Inventors: Armstrong, Jean; Lowery, Arthur James

A method of communicating digital information over a dispersive optical channel includes encoding the digital information into a plurality of data blocks, each of which includes a number of bits of the information. A time-varying electrical signal is generated which corresponds with each of said data blocks. The time-varying electrical signal is applied to an optical transmitter (122) to generate an optical signal which includes an asymmetrically amplitude limited transmitted signal ...

Apparatus and method for support of dimming in visible light communication

Patent Number: 8107825
Publication Date: 2012-01-31
Inventors: Rajagopal, Sridhar; Li, Ying

A method and system for visible light communication (VLC) for use in a dimmable lighting environment is provided. The method includes transmitting data using light from at least one light source, a brightness of the light reduced below a maximum level. The method also includes compensating or accommodating for the reduced brightness of the light at a VLC circuitry to maintain communication. The method further includes transmitting data to at least one VLC receiver using the light from the ...

Passive optical network system and communication method therefor

Patent Number: 8107824
Publication Date: 2012-01-31
Inventors: Kazawa, Tohru; Yajima, Yusuke; Tsuchiya, Akihiko

In a passive optical network system in which communication signals from a master station to a plurality of subsidiary stations are multiplexed by time division and transmitted, after converting (modulating) data with a high transmission speed to a low transmission speed, a base speed, in the master station, a header including an identifier destined for each subsidiary station is attached to the data with a low transmission speed and the converted data, respectively, the data and the header ...

Optical transmission module

Patent Number: 8107823
Publication Date: 2012-01-31
Inventors: Yamada, Osamu; Ishii, Hiroyoshi; Ohtake, Toshikazu; Maeda, Fumihide; Motohiro, Satoshi

In an optical transmission module having a communication module which is freely movable in a case, when a tensile force is generated on an optical cable after connection of an optical transmission module, optical coupling surface and an optical axis center follow each other and thus stable optical transmission can be constantly ...

Protocols for out-of-band communication

Patent Number: 8107822
Publication Date: 2012-01-31
Inventor: Noble, Gayle L.

Methods for managing an optical network through out-of-band communication between optical transceiver modules in a heterogeneous network fabric are disclosed. The disclosed methods include methods for performing fabric discovery, communicating error messages, detecting intrusion. Methods are also disclosed for communicating between transceivers of differing protocol versions and memory ...

Systems and methods for Ethernet extension and demarcation

Patent Number: 8107821
Publication Date: 2012-01-31
Inventors: El-Ahmadi, Siraj Nour; Wilcox, Reginald; Hotchkiss, Adam R; El Ahmadi, Salam

The present invention provides Ethernet extension and demarcation functionality through a Multi-Source Agreement (MSA) pluggable transceiver in a customer or remote device. The pluggable transceiver is configured to frame an Ethernet client signal and to provide OAM&P functionality, such as with G.709 framing. The pluggable transceiver operates within existing multi-source agreement (MSA) specifications. Accordingly, the pluggable transceiver can operate in any customer device compliant to ...

Systems and methods for the integration of framing, OAM&P, and forward error correction in SFP optical transceiver devices

Patent Number: 8107820
Publication Date: 2012-01-31
Inventors: El-Ahmadi, Siraj Nour; Hotchkiss, Adam R; El Ahmadi, Salam

The present invention provides systems and methods for integrated framing functionality; optical layer operations, administration, maintenance, and provisioning (OAM&P); forward error correction (FEC); data encapsulation; and performance enhancement support in SFP optical transceiver modules. An SFP pluggable transceiver is configured to frame a client signal and to provide OAM&P functionality, such as with G.709 framing. The SFP pluggable transceiver operates within existing multi-source ...

Systems and methods for interference prediction

Patent Number: 8107819
Publication Date: 2012-01-31
Inventors: Hsu, Dar-Zu; Yang, Chun-Liang

An optical network device of a passive optical network is introduced. The optical network device includes a light source, a control unit, and a variable optical attenuator. The light source can generate an optical signal. The control unit can generate a magnetic signal based on a control signal capable of providing information relating to a distance between the optical network device and an optical line termination. The variable optical attenuator can adjust a polarization angle of the ...

Tunable filter

Patent Number: 8107818
Publication Date: 2012-01-31
Inventors: Sakurai, Yasuki; Chong, Changho

A light is incident on a refractive diffraction grating 13, and is distributed for each of wavelengths at different angles to be outputted. A lens 14 converts the distributed lights into belt-shaped lights, and the belt-shaped lights are incident on a mirror substrate 15 having selective reflection regions 17-1 to 17-x. By moving the mirror substrate 15 toward a direction different from a distribution direction of the belt-shaped ...

Method for receiving optical orthogonal frequency-division multiplexing signal and receiver thereof

Patent Number: 8107817
Publication Date: 2012-01-31
Inventors: Hsu, Dar-Zu; Lin, Yu-Min; Chen, Hung-Lin

A method for receiving an optical orthogonal frequency-division multiplexing (OFDM) signal and a receiver thereof are applicable to an optical OFDM system. The receiving method includes the following steps. An optical signal is converted into a digital signal. A symbol boundary of the digital signal is estimated. A guard interval of the digital signal is removed according to the symbol boundary, so as to generate an electrical signal. The electrical signal is converted into a plurality of ...

Wavelength division multiplexing module

Patent Number: 8107816
Publication Date: 2012-01-31
Inventors: Bolster, Kristofer; Pfarr, John

A telecommunications module includes an optical wavelength division multiplexer/demultiplexer configured to demultiplex a first optical signal input into the telecommunications module into a plurality of different wavelengths, a fiber optic splitter configured to split a second optical signal input into the telecommunication module into a plurality of optical signals, and a plurality of optical add/drop filters, each of the optical add/drop filters configured to combine one of the optical ...

System and method for communicating wireless data utilizing a passive optical network

Patent Number: 8107815
Publication Date: 2012-01-31
Inventors: Naito, Takao; Akasaka, Youichi; Mizutani, Satoshi

In one embodiment, a method for providing wireless communications utilizing a passive optical network (PON) is disclosed. The method includes receiving, at a PON, downstream packets from a base station destined for a mobile station, and transmitting the downstream packets to wireless transceivers associated with PON. The method also includes receiving, at the first wireless transceiver communicatively coupled to a first optical network terminal (ONT), the downstream packets from the first ...

Transporting upstream data in a passive optical network

Patent Number: 8107814
Publication Date: 2012-01-31
Inventors: Farvez, Amin; Jones, Michael; Futch, Richard J.; Kien, Thai-Bao H.; Causey, Richard T.

Upstream data handling in a digital Data Over Cable Service Interface Specification (DOCSIS) passive optical network (DPON). Embodiments include receiving at a headend, in an upstream path over an optical network, a plurality of digitized and serialized DPON upstream packets respectively distributed in a time division multiplexed fashion, wherein each DPON upstream packet includes a header, a trailer and a payload, monitoring the optical network for energy in the upstream path, including ...

Drive circuit and optical switch

Patent Number: 8107813
Publication Date: 2012-01-31
Inventors: Noguchi, Masaji; Yoshida, Setsuo; Kai, Yutaka

A drive circuit includes a first transistor that is controlled to be in on or off state in response to a control signal, and outputs, in on state, a positive current which is input from a first operational amplifier connected with a drain of the first transistor to a semiconductor optical amplifier; and a second transistor that is connected with a source of the first transistor, and is in inverse on or off state to the state of the first transistor. The drive circuit also includes a ...

Dynamic range measurement and calculation of optical keyless entry sensor

Patent Number: 8107812
Publication Date: 2012-01-31
Inventor: Zhang, Wenwei

An optical keyless entry sensor system and method includes an optical sensor in association with a mirror that reflects light transmitted from the optical sensor, wherein reflected light is detectable by the optical sensor. An attenuation filter can be located between the mirror and the optical sensor, wherein the attenuation filter is configured to simulate a contamination of the optical sensor in order to determine an exact level of attenuation representative of contamination that causes ...

Remotely controlling one or more client devices detected over a wireless network using a mobile device

Patent Number: 8106742
Publication Date: 2012-01-31
Inventors: Longe, Michael R.; Marshall, Kevin; Lefevre, John

According to one general aspect, a method according to the present application includes remotely controlling wirelessly networked devices via a mobile unit. The method includes receiving, at a mobile unit and from a user, an input, analyzing the input to identify a networked device associated with the input, determining whether the networked device is presently accessible via a wireless network; determining whether to establish a connection with the networked device based on whether the ...

Linearized phase modulated analog optical links

Patent Number: 8103178
Publication Date: 2012-01-24
Inventor: McKinney, Jason D.

A phase-modulated analog optical link that uses parallel interferometric demodulation to mitigate the dominant intermodulation distortion present in the link. A receiver for demodulating phase modulated optical signals includes a splitter dividing the phase modulated signal into parallel optical paths, each optical path having an asymmetrical interferometer, the time delays of the interferometers being unequal, and each optical path includes a photodiode optically connected to an output of ...

Apparatus and method for frequency offset monitoring used in digital coherent optical receiver

Patent Number: 8103177
Publication Date: 2012-01-24
Inventors: Nakashima, Hisao; Li, Lei; Tao, Zhenning; Zhang, Huijian

The present invention discloses a frequency offset detecting apparatus and method for use in a digital coherent optical receiver. The digital coherent optical receiver comprises: a front-end processing section for generating a digital baseband electric signal; an equalizer for performing equalized filtering on the digital baseband electric signal; and the frequency offset detecting apparatus for detecting frequency offset contained in the digital baseband electric signal or frequency offset ...

Frequency offset compensating apparatus and method, and optical coherent receiver

Patent Number: 8103176
Publication Date: 2012-01-24
Inventors: Nakashima, Hisao; Li, Lei; Tao, Zhenning

The present invention relates to a frequency offset compensating apparatus and method, and an optical coherent receiver. The optical coherent receiver includes a front end processor and a frequency offset estimator, of which said front end processor converts an inputted optical signal into a base band digital electric signal, and said frequency offset estimator estimates a phase offset change introduced by a frequency offset in said base band digital electric signal; said frequency offset ...

Optical signal processing systems and methods for amplification and/or attenuation

Patent Number: 8103175
Publication Date: 2012-01-24
Inventors: Enoch, Michael; Kowalczyk, Anthony C.

An optical signal processing system is provided that includes a first light modulator for receiving, placing information on a first optical signal, and for producing a second optical signal. The second optical signal includes a desired signal portion and an undesired signal portion. The optical signal processing system includes a second light modulator that tunes a first optical pump signal to a Brillouin frequency that is less than, but corresponding to, a frequency of the undesired signal ...

Transmission network having an optical receiver that utilizes dual power pins and a single status pin to lower power consumption, lower manufacturing cost, and increase transmission efficiency

Patent Number: 8103174
Publication Date: 2012-01-24
Inventors: Schneider, Edmund M.; Susanto, Tony; Mokry, Wesley L.; Knapp, David J.

A communication network is provided for interconnecting a network of digital systems, such as multimedia devices. Each node of the communication network may include a receiver and a transmitter. The receiver and transmitter of each node can be an optical receiver and transmitter. The optical receiver is preferably powered by two power supply pins, each providing different supply amounts. An activity detector within the receiver can be powered from a first supply amount, and the signal path ...

Method and system for a polarization mode dispersion tolerant optical homodyne detection system with optimized transmission modulation

Patent Number: 8103173
Publication Date: 2012-01-24
Inventors: Djordjevic, Antonije R.; Maricevic, Zoran; Schemmann, Marcel F. C.; Racey, Darby

An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted to the center of the data bands, and its polarization state is matched to the polarization state of the respective data bands to compensate for polarization mode dispersion during transmission. By shifting a boosted side carrier to the center of the data bands, and by simultaneously compensating ...

Distributable quantum relay architecture

Patent Number: 8103172
Publication Date: 2012-01-24
Inventors: Peters, Nicholas A.; Runser, Robert; Goodman, Matthew S.; Chapuran, Thomas E.

A distributed quantum relay architecture is disclosed. In one embodiment of this architecture, time and wavelength division multiplexing are used to enable a laser pump pulse, already used to create an initial entangled photon pair, to be distributed to a remote relay site, on the same optical fiber as a photon from that initial pair. At that remote site, the pump pulse is amplified and used to locally create the second entangled photon pair that is required for quantum teleportation. This ...

Method, system and device for data transfer in an optical network

Patent Number: 8103171
Publication Date: 2012-01-24
Inventors: Lin, Huafeng; Yu, Fan

A method for data transfer in an optical network, including: amplitude modulating, by a central office, an optical carrier by a downstream data with a first rate to generate a downstream optical signal carrying the downstream data; sending the downstream optical signal to a user terminal; obtaining, by the user terminal, the downstream data from the downstream optical signal; amplitude modulating, by the user terminal, the downstream optical signal by an upstream data with a second rate to ...

Method for optical time division multiplex and apparatus thereof

Patent Number: 8103170
Publication Date: 2012-01-24
Inventor: Toda, Hiroyuki

The present invention inputs a signal synthesized an optical pulse with a variable-wavelength laser beam different in wavelength from it to a delay unit (S1). The delay unit branches the signal to two optical signals, produces an optical path difference between them to afford a delay, synthesizes them again to generate a multiplexed optical signal, and minutely varies the optical path length of one of them (S2). The present invention measures output variance of the delay unit ...

VWS secure/non-secure bypass switch

Patent Number: 8103169
Publication Date: 2012-01-24
Inventor: Winegard, Robert

Disclosed is a secure/non-secure bypass switch, which includes a secure mode signal path, and a non-secure mode signal path, wherein signals are routed through an encryption device connected in the secure mode signal path when no power is supplied to the switch, and the signals are routed through the non-secure path when power is supplied to the ...

RF discrete time optical frequency translator

Patent Number: 8103168
Publication Date: 2012-01-24
Inventors: Enoch, Michael; Kowalczyk, Anthony C.; Samra, Parmijit

A frequency translator, a method, and a machine readable medium for performing frequency signal translations are disclosed. The frequency translator includes a modulator for modulating an optical pulse train with an input RF signal to generate an output optical pulse train having the amplitude information of the input RF signal at a plurality of times corresponding to the optical pulse train. In addition, the frequency translator includes a modulator for modulating the output optical pulse ...

System for free space optical communication and method for operation thereof

Patent Number: 8103167
Publication Date: 2012-01-24
Inventor: Tidhar, Gil

A free space optical communication system is described that comprises a receiver node and a transmitter node communicating to each other via a control data communication channel and an information data communication channel operating at a wavelength region different from the wavelength region of the control data communication channel. The receiver node includes a receiver unit configured to receive an information data signal provided by the transmitter node through the information data ...