Matches 1 - 18 out of 18


Match Document Document Title
US20060088321 Closed loop RZ-DPSK alignment for optical communications  
A method and system are provided for using a power spectral density of an output of a modulator to facilitate closed loop feedback for controlling alignment of a pulse with respect to information...
US20050025502 Modular optical device that interfaces with an external controller  
Optical modules described herein include optical components such as lasers or photodiodes for communicating on fiber-optic networks. The lasers and photodiodes have analog interface such that the...
US20090310978 COMPLEMENTARY OPTICAL WIRING SYSTEM  
A complementary optical wiring system has a transmitting circuit configured to combine a delayed signal obtained by delaying a digital electric input signal by a time shorter than a minimum pulse...
US20070116478 Calibration for optical power monitoring in an optical receiver having an integrated variable optical attenuator  
Disclosed herein are various methods of calibrating optical receivers. One such method includes controlling different levels of optical power of light transmitted to an optical receiver having an...
US20070160374 Optical transmitter and method for controlling optical transmitter  
An optical transmitter includes a laser diode drive circuit for driving a laser diode in accordance with a laser diode current that superimposes a pilot signal on a “0” logic level and a “1” logic...
US20050249508 Method and system for controlling laser diodes in optical communications systems  
A system and an apparatus used to control laser diodes in optical communications systems, wherein the targeted or desired laser power can be varied, if needed, as a function of the laser...
US20080025729 Optical transceiver precisely setting the transmission rate of the output optical signal  
The present invention is to provide an optical transceiver that enhances and keeps the exactness of the transmission rate of the optical signal to be transmitted. The transceiver includes a rate...
US20060133824 Apparatus for stabilizing wavelength of optical source for optical communications  
Provided is an apparatus for stabilizing a wavelength for optical communications which includes a digital control circuit unit and an analog control circuit unit to stabilize a wavelength that may...
US20070280703 WAVELENGTH SWEEP CONTROL  
Methods and apparatus for the active control of a wavelength-swept light source used to interrogate optical elements having characteristic wavelengths distributed across a wavelength range are...
US20100215379 AUTO-POWER CONTROL CIRCUIT TO MAINTAIN EXTINCTION RATIO OF OPTICAL OUTPUT FROM LASER DIODE  
The present invention provides an auto-power control (APC) circuit and a method to stabilize the extinction ratio of an optical output from a laser diode (LD) in an optical transmitter. The APC...
US20110229151 PHOTOELECTRIC ENCODER  
A photoelectric encoder includes a scale; a detector; alight application section; a pair of origin signal reception sections; and a signal processing section adapted to provide the maximum value...
US20110058821 OPTICAL TRANSMISSION APPARATUS, OPTICAL TRANSMISSION SYSTEM, AND OPTICAL TRANSMISSION METHOD  
An optical transmission apparatus in an optical transmission system that transmits an optical signal through a transmission fiber includes a measurement device that measures Raman gain efficiency...
US20060078339 System and method for reducing interferometric distortion and relative intensity noise in directly modulated fiber optic links  
A laser transmitter with a feedback control loop for minimizing noise. The novel laser transmitter includes a laser, an external reflector adapted to form an extended cavity to the laser, and a...
US20110229150 OPTICAL MODULATION APPARATUS AND OPTICAL MODULATION METHOD  
An optical modulation apparatus includes a first modulator, a second modulator, a multiplexer, a calculator and an adjustor. The first modulator configured to modulate light emitted by a light...
US20100254717 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...
US20140186056 Closed Loop Optical Modulation Amplitude Control  
Systems and methods are provided for a low frequency AC comparison circuit. The low frequency AC comparison circuit includes circuitry configured to receive a monitoring signal generated by an...
US20110158655 Dispersion Measurement of Optical Fibres During Operation  
The invention at hand concerns a method and a system for transmitting data in an optical transmission system. A measuring signal is generated having a wavelength which differs from the wavelengths...
US20100303472 APPARATUS AND METHOD FOR ADAPTIVELY CONTROLLING THE IMPULSE RESPONSE OF THE OPTICAL SIGNAL OUTPUT FROM A LASER OF AN OPTICAL TRANSMITTER (TX)  
An apparatus and a method are provided for adaptively adjusting the impulse response of the optical output of the laser of the optical TX in a way that ensures that the optical waveform being...

Matches 1 - 18 out of 18