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
Power semiconductor module
Separate matching models based on type of phone associated with a caller
Stabilization of dicarbonate diesters with protonic acids
Method and system for detecting center pivot collision
Parallel processing computer systems with reduced power consumption and methods for providing the same
Method for accessing wireless network
Hybrid fin field-effect transistor structures and related methods
  Randomly Featured Patents
Ultrasound system and method for measuring bladder wall thickness and mass
Method and apparatus for preventing starvation in a multi-node architecture
Method and apparatus for synthesizing urea
Surface mount motor
Method for separating off viruses from a protein solution by means of nanofiltration
Adhesion promotion
Slidable index tab for hanging file folder
Lid for drinking containers
Stabilization of iron in aqueous systems
End joining device for carrier traveling rails