Resources Contact Us Home
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
Hair motion compositor system for use in a hair/fur pipeline
Image forming apparatus, image forming method, and computer readable medium for identifying target-recording element using detection pattern
Toner cartridge and image forming apparatus including the same
HYR1 as a target for active and passive immunization against Candida
Anti-FGFR3 antibodies and methods using same
Policy based cryptographic application programming interface in secure memory
Photoelectric conversion apparatus
  Randomly Featured Patents
Reflector telescope with upright image
Carbonaceous fines recycle
Process for the hydrogenation of unsaturated triglycerides
Laser device tuned by forming a refractive index grating in optical fiber
Toner, color toner set, developer, process cartridge, and image forming method
Determination of characteristics of material
Alphanumeric input device
Infrared communications receiver
Emp generator