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
Use of Lactobacillus for liver protection
Phosphor adhesive sheet, light emitting diode element including phosphor layer, light emitting diode device, and producing methods thereof
Patterned birefringent product
Controller interface providing improved data reliability
Method for transmitting a signal from a transmitter to a receiver in a power line communication network, transmitter, receiver, power line communication modem and power line communication syst
Antenna device and wireless communication apparatus
Lubricant supplying device, process cartridge, and image forming apparatus
  Randomly Featured Patents
Control device for the therapeutic mobilization of joints
Bearing device
Headset-- hookless
Valve seal retainer with multiple diameter boot base
High protein pasta formulation
Probe card with vertical needle for enabling improved wafer testing and method of manufacturing the same
Device and method of driving light source in display device
Toy vehicle having rolling oscillatory motion
Integrated interference cancellation system architecture with distortion correction
Electronic device package