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
Circuit board and display panel assembly having the same
Methods and systems to reduce a number of simulations in a timing analysis
Surface-emitting laser light source using two-dimensional photonic crystal
Magnesium metal-air battery
Apparatus and methods for color displays
Direct mode adapter based shortcut for FCoE data transfer
Methods and compositions for inhibiting progression to chronic cardiac failure
  Randomly Featured Patents
Interactive language conversion system
Chromatographic method for high yield purification and viral inactivation of antibodies
Hopper for a weighing machine
Plane display element
Card connector
Process for the preparation of liquid mixtures of compounds having isocyanate groups
Electrically controlled pressure-regulating system for a hydraulic circuit
Machine for applying an article carrier to a plurality of bottles
Inspection of solder bump lighted with rays of light intersecting at predetermined angle
Current sensing