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
Fluorine-free fused ring heteroaromatic photoacid generators and resist compositions containing the same
Cardiac chamber volume computation from contours and base plane in cardiac MR Cine images
Terminal device, system and computer readable medium
TPO compositions, articles, and methods of making the same
Method and apparatus for detecting and tracking vehicles
Topology discovery, control channel establishment, and datapath provisioning within an aggregation network with centralized control
Time sharing type autostereoscopic display apparatus and method for driving the same
  Randomly Featured Patents
Pseudo 3D image creation device, pseudo 3D image creation method, and pseudo 3D image display system
Method of making porous-si capacitor dram cell
Formed wheel tire and method
System and method for estimating the epipolar geometry between images
Tobacco smoke filter
Speed reduction device of vehicle
Face detection device, digital camera, and computer readable storage medium which stores a face detection program
Metal species surface treatment of thin film photovoltaic cell and manufacturing method
Reclosable container lid
Container rack