Resources Contact Us Home
Optical transmitter apparatus

Image Number 16 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
Apparatus for providing location information of hand-held device and method thereof
Electronic component
Topology discovery, control channel establishment, and datapath provisioning within an aggregation network with centralized control
Video reproducing apparatus and video reproducing method
Methods of isolating bipotent hepatic progenitor cells
Integrated circuit packaging system with an encapsulation and method of manufacture thereof
Monitoring cloud-runtime operations
  Randomly Featured Patents
Dedicated message matched filter
Circuit for generating a sum or differential frequency signal
Remote access between UPnP devices
Optical disk, an optical disk barcode forming method, an optical disk reproduction apparatus, a marking forming apparatus, a method of forming a laser marking on an optical disk, and a method
Oscillator damped test and evaluation circuit for a proximity switch
Herbicidal compounds
Color standard method and apparatus
Thin flexible, RFID labels, and method and apparatus for use
Semiconductor device and method of forming embedded passive circuit elements interconnected to through hole vias
Method of making tungsten gate MOS transistor and memory cell by encapsulating