Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Coverage at a glance
Celestial body running vehicle wheel
Bolt retention apparatus and method
Method and apparatus of operating a scanning probe microscope
Camera lens
Converter device for communicating with multiple medical devices
Leather production and aqueous formulations suitable therefor
  Randomly Featured Patents
Method of manufacturing plasma addressed liquid crystal display
Method for digitally controlling the envelope curve in a polyphonic musical synthesizer and circuitry to implement the method
Optical fibre cable incorporating a stack of fibre ribbon elements
Coupling for quick connection of elements
Method and apparatus for producing plastic foam boardstock and product thereof
Ball cleaner
Method for preparing high performance ball grid array board and jig applicable to said method
Internal liner for a sport boot
Apparatus for emitting high-frequency electromagnetic waves
Dynamic row buffer circuit for DRAM