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
Light emitting device and light emitting device package
Repeating frame battery with joining of cell tabs via welded-on male and female slip-fit connectors
Electrical installation arrangement
Method and system for checking citations
Authentication platform and related method of operation
Systems and methods for online search recirculation and query categorization
Mounting apparatus for PCI card
  Randomly Featured Patents
Liquid-crystal display device and method of driving liquid-crystal display device
Method and apparatus for managing intelligent assets in a distributed environment
Ballast power supply
III-nitride superlattice structures
Data processing system, method, and computer program product for generating a generic compilation interface from object-oriented code
Position determination method, positioning device, and electronic instrument
Optical modulator module package using flip-chip mounting technology
Method and apparatus for forming decorative inlays in wax candle walls
Motion-detector circuitry with adjustable background lighting level
Magnetic element