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
Solid-state imaging apparatus and imaging system
Acoustic echo cancellation
Hard disk drives having different rotational speeds
Replacing memory pointers with implicit pointers to be used in compiler-generated debug output
Variety corn line LIC7382
Wireless monitoring in process applications
Mobile target system
  Randomly Featured Patents
Preparation of high-modulus, high-strength linear polycondensates
High speed electrographic printing
Beginning-of-tape sensor with automatic threshold adjustment
Novel 9-substituted carbacyclin analogs
Derivatives of 3,3-diphenylpropylamines
Terminal and method for controlling display in terminal
Method for placing contact on electrical connector
Monopolar ion exchange membrane electrolytic cell assembly
System and method for power line carrier communication using high frequency tone bursts