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| Number | Title | Issue Date |
| 8145067 | Optical transmitter An optical transmitter includes a light source that outputs light superposed with a pilot signal having a predetermined frequency; an optical modulating unit that modulates the light from the light source according to an input electric signal; a detecting unit that ... | 03/27/2012 |
| 8086111 | Apparatus and method for controlling the optical output power of a laser in an optical transmitter (TX) A semi-open feedback loop optical output power control apparatus and method are provided for use in an optical TX. The apparatus and method enable input data signals having content frequencies that are below the cutoff frequency of the optical output power monitorin... | 12/27/2011 |
| 8081883 | Method and apparatus for compensating for optical crosstalk in an optical output power feedback monitoring system of a parallel optical transmitter A method and an apparatus are provided for use in a parallel optical transmitter or transceiver to compensate for variations in optical crosstalk in an optical output power monitoring system that are caused by lasers being enabled and/or disabled. In particular, the... | 12/20/2011 |
| 7978984 | Data communication unit using light-emitting diode for data communication, and electronic device The present invention enables device downsizing by utilizing a light-emitting diode as a plurality of interfaces. A light-emitting diode 11 of a data communication unit using a light-emitting diode for data communication outputs light when a current flows the... | 07/12/2011 |
| 7936998 | Optical transmitter apparatus An optical DQPSK modulator comprises a pair of phase modulators. Each of the pair of the phase modulators is provided with first and second driving signals. The first and second driving signals are amplified by first and second amplifiers, respectively. An RZ intens... | 05/03/2011 |
| 7809283 | Multi-transceiver module control with single microcontroller An optical transmit and receive circuit that includes a single control module that controls the transmit and receive operational behaviors in multiple transmit and receive data paths of the optical transmit and receive circuit. By having a single control module cont... | 10/05/2010 |
| 7787778 | Control system for a polar optical transmitter A method of controlling a polar optical transmitter comprising a dual-branch Mach-Zehnder (MZ) modulator driven by a pair of independent electrical drive signals. A cost function is provided which defines a relationship between a control parameter of the optical tra... | 08/31/2010 |
| 7657190 | Optical transmitter apparatus An optical DQPSK modulator comprises a pair of phase modulators. Each of the pair of the phase modulators is provided with first and second driving signals. The first and second driving signals are amplified by first and second amplifiers, respectively. An RZ intens... | 02/02/2010 |
| 7620329 | Laser power control with automatic compensation A method and apparatus is disclosed for optic signal power control to maintain a desired or optimum optic signal power level. During start-up, a default or target value from memory may be utilized to bias or otherwise control operation of an optic signal generator o... | 11/17/2009 |
| 7593648 | Method and system for high bit rate fiber-optic communications A method and system for high bit rate fiber-optic communications utilize a wavelength tunable transmitter controlled by a feedback signal from an error analyzer associated with a received optical data stream. ... | 09/22/2009 |
| 7593647 | Apparatuses and methods for automatic wavelength locking of an optical transmitter to the wavelength of an injected incoherent light signal An optical transmitter has a resonance wavelength characteristic that varies with the refractive index of the optical transmitter. The optical transmitter receives a narrow band injected wavelength signal from an incoherent light source. The controller substantially... | 09/22/2009 |
| 7437070 | Submarine observation apparatus and submarine observation system In each of a plurality of submarine observation apparatus (1 to n), a branching unit (63) branches fixed-wavelength light (λ1) from an incoming wavelength-multiplexed light signal. An observation signal modulating unit (64) modulates the... | 10/14/2008 |
| 7424228 | High dynamic range radio frequency to optical link A communication system includes an optical transmitter which is differentially driven and an optical receiver that outputs a differential signal. The optical transmitter creates the differential drive signal from an input signal and delivers the differential drive s... | 09/09/2008 |
| 7424221 | Optical network terminal with illegal transmission detection circuitry An optical network terminal, which includes an optical transmitter, monitors the status of the optical transmitter, such as the output or the power consumption of the optical transmitter, to determine when the optical transmitter is illegally transmitting. When an i... | 09/09/2008 |
| 7418210 | Programmable transition time adjustment mechanism An optical transceiver in which one or more bias currents provided to the laser driver are adjusted at cold temperatures such that transition speeds are reduced. A preliminary current generation circuit generates a preliminary current. In addition, a programmable co... | 08/26/2008 |
| 7415053 | Optical transmitter with a least pair of semiconductor laser diodes The present invention is to provide an optical transmitter with reduced power consumption. The optical transmitter includes two laser diodes connected in series to each other, one of which is connected in the anode thereof to the first driver, while the other of whi... | 08/19/2008 |
| 7412174 | Method and apparatus for distortion control for optical transmitters A method of manufacturing an optical transmitter includes assembling a laser device on a module including a temperature sensor and a temperature controller. An optimum operating temperature of the laser to minimize optical distortion is determined at a temperature w... | 08/12/2008 |
| 7403718 | Modulation phase shift to compensate for optical passband shift Disclosed is a technique for compensating for optical passband shift of an optical component (for example an optical demultiplexer). A broadband source coupled to a dispersive element generates a chirped pulsed optical signal. Data is modulated onto particular wavel... | 07/22/2008 |
| 7398023 | Method and apparatus for bias and alignment control in an optical signal transmitter A method and apparatus for controlling bias and alignment in an optical signal transmitter for providing intensity modulation and DPSK modulation to an optical signal, e.g. in an RZ-DPSK modulation format. Output power in dither signals applied to the bias signals m... | 07/08/2008 |
| 7379672 | Photonic RF distribution system The present photonic RF generation and distribution system provides a system and method for distributing an RF output signal. The photonic RF distribution system includes two optical sources for generating optical signals. A first optical source (42) is opera... | 05/27/2008 |
| 7373091 | Multicasting optical switch fabric and method of detection based on novel heterodyne receiver The inventors propose herein a switch fabric architecture that allows broadcasting and fast channel access in the ns-range. In various embodiments of the present invention, 10 Gb/s receiver modules are based on a novel heterodyne receiver and detection technique, wh... | 05/13/2008 |
| 7369774 | Optical frequency controlling device for ultra-dense wavelength-division-multiplexed optical channels Disclosed is an optical frequency controlling device for ultra-dense wavelength-division-multiplexed optical channels in which center frequencies of optical channels are aligned. An optical frequency controlling device for ultra-dense wavelength-division-multiplexed... | 05/06/2008 |
| 7365902 | Optical amplifier and optical communication system An optical amplifier includes a plurality of pump light sources, an intensity modulator that modulates intensity of a pump light to be output from any one of the pump light sources, at a predetermined frequency; a photoelectric converter that converts a part of the ... | 04/29/2008 |
| 7366426 | Optical add/drop multiplexer using tunable filter and method for feedback controlling the tunable filter A wavelength stabilizing filter has a wavelength transmission characteristic curve that has its peak in a wavelength located between a first continuous set band and a second continuous set band longer in wavelength than the first set band, and that linearly drops fr... | 04/29/2008 |
| 7366428 | Optical receiver An optical receiver includes a light-receiving part and a control part. The light-receiving part includes an APD, a PIN-PD, and a branching optical device. First signal light is incident on the light-receiving part and is divided into second signal light and third s... | 04/29/2008 |
| 7366427 | Line driver with variable bandwidth control A method and apparatus to provide bandwidth control in a high speed line driver circuit is described. ... | 04/29/2008 |
| 7358834 | Transmission line voltage controlled nonlinear signal processors Waveguide nonlinear signal processors include transmission lines defined on a substrate. A plurality of varactors or pairs of varactors are situated along the transmission line and are in communication with a signal conductor of the transmission line and one or more... | 04/15/2008 |
| 7340186 | Discrimination phase margin monitor circuit, transmitting/receiving device and communication system The discrimination phase margin monitor circuit (10) of the present invention comprises a first discrimination circuit (11 and 12) discriminating an input data signal using a clock signal extracted from the input data signal, a second discrimina... | 03/04/2008 |
| 7340184 | Linearized Optical Transmitter Using Feedback Control Apparatus and methods for linearizing an optical transmitter are described. A linearized optical transmitter according to the present invention includes a modulator bias voltage supply that biases an optical modulator. The optical modulator modulates an optical sign... | 03/04/2008 |
| 7336906 | Optical signal transmission An optical signal transmission apparatus for transmitting a plurality of data signals comprising a plurality of inputs for receiving a respective one of the data signals and delivering the respective data signal with a controlled phase and at a controlled data rate.... | 02/26/2008 |
| 7330667 | Electrical compensation of optical impairments Optical impairments such as dispersion and fibre nonlinearity are compensated by generating a pre-distorted electrical signal at the transmitter. This signal is modulated onto a carrier signal, so that it is upconverted in frequency. This up converted signal is then... | 02/12/2008 |
| 7330665 | Optical frequency modulated transmitter An optical frequency modulated transmitter includes a plurality of separately phased-controlled slave lasers, the outputs of which are combined to form a single output beam of the transmitter. A master optical oscillator outputs an optical signal for injection locki... | 02/12/2008 |
| 7327913 | Coherent optical detector and coherent communication system and method An optical device is provided with first and second inputs. A first coupler coupled is coupled to the first input and produces at least a first and second output. A second coupler is coupled to the second input and produces at least a first and second output. A thir... | 02/05/2008 |
| 7324760 | Apparatus and method for phase synchronization control in RZ optical transmitter An optical RZ transmitter comprises an optical signal source and a pair of electro-optical modulators in tandem, one arranged to receive a NRZ electrical data signal and the other a clock signal at the data rate of the data signal. The phase difference between the d... | 01/29/2008 |
| 7324572 | Laser driver circuit for burst mode transmission and fabrication method thereof A method for making a laser driver circuit for burst mode is described. The method includes the following steps: First, a continuous mode laser driver circuit is selected, the chip having a temperature compensation output, a bias current setting input, and a referen... | 01/29/2008 |
| 7324758 | Optical dispersion monitoring apparatus and optical dispersion monitoring method, and optical transmission system using same An optical dispersion monitoring apparatus and an optical dispersion monitoring method are capable of monitoring dispersion accurately with a simple construction in an optical transmission system using the same. To this end, the optical dispersion monitoring apparat... | 01/29/2008 |
| 7308204 | Noise suppressing method and apparatus thereof In the invention, an input light including a signal light and a noise light within a signal wavelength band of the signal light is divided into a first component with a polarization parallel to a polarization direction of the signal light and a second component with... | 12/11/2007 |
| 7305045 | Low voltage swing pad driver and receiver Low voltage swing pad driver and receiver. A transmitter portion and a receiver portion are implemented within various devices that communicate using low voltage swing pads communicatively coupled via a trace. The transmitter portion of one device generates a curren... | 12/04/2007 |
| 7302186 | Optical transceiver and host adapter with memory mapped monitoring circuitry A host adaptor is configured to monitor operation of an optoelectronic transceiver. The host adapter includes a transceiver interface, memory, comparison logic and a host interface. The transceiver interface receives from the optoelectronic transceiver digital value... | 11/27/2007 |
| 7286771 | Multi-channel optical transmitter incorporating a tunable optical signal source and method for transmitting a multi-channel optical signal The multi-channel optical transmitter is composed of a tunable optical signal source, an optical multiplexer and an intensity reducer. The tunable optical signal source includes a tunable laser, and additionally includes an optical signal output through which it out... | 10/23/2007 |
