Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Optical transmitter apparatus










Image Number 10 for United States Patent #7657190.

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 intensity modulator generates an optical RZ-DQPSK signal from an optical DQPSK signal output from the optical DQPSK modulator. A photodetector generates a monitor signal from the optical RZ-DQPSK signal. A gain adjuster unit adjusts the gains of the first and second amplifiers so as to minimize the power of the monitor signal.








 
 
  Recently Added Patents
Dehumidifier
Vehicle running control system
Battery power management system and method
Systems and methods of device-free motion detection and presence detection
Method, preprocessor, speech recognition system, and program product for extracting target speech by removing noise
Integrated transmit/receive switch
Engineered enzymes with methionine-gamma-lyase enzymes and pharmacological preparations thereof
  Randomly Featured Patents
Supported pallet rack
Oscillator arrangement and method for generating a periodic signal
Combustion system and method with fog injection and heat exchange
Apparatus and method for reducing the visual effects of artifacts present in a line scanned video display
Mixed acid stain inhibitor
Solution and method for cleaning tooth enamel
Apparatus for monitoring wet compression gas turbine power augmentation-related casing distortions
Payment system and its method for supporting user verification in VoIP configuration
Universal connector device for bus networks in host computer/co-processor computer system
System and method for reading a memory cell