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
Methods and apparatus for low power out-of-band communications
Methods and devices for creating, compressing and searching binary tree
Device for installing conducting components in structures
Methods of isolating bipotent hepatic progenitor cells
Nestable shallow container
Antibodies to Clostridium difficile toxins
Simultaneous enhancement of transmission loss and absorption coefficient using activated cavities
  Randomly Featured Patents
Blank adapted to be blown into a container and providing orientation of the material in the mouth and neck as well as the body
Low energy appliance control apparatus and method
Combined filter and skimmer assembly for ponds
Sun gear bushing and sleeve and method for sealing in a hybrid electromechanical automatic transmission
Dispensing apparatus
Methods and articles of manufacture for the detection of cryptosporidium occysts
Thrust bearing with locking tabs
X-ray CT scanner and image creating method
Cigarette vending machine