Resources Contact Us Home
Optical transmitter and optical transmission system

Image Number 12 for United States Patent #7116917.

The present invention suppresses to a minimum the degradation of the transmission quality caused by chromatic dispersion characteristic of an optical transmission medium, and the interplay between the chromatic dispersion and non-linear optical effects in dense WDM transport systems. A baseband input data signal is pre-coded in advance by a pre-coding unit, phase modulation is carried out using a pre-coded signal by the optical phase modulating unit, and the phase modulated optical signal is converted to an RZ intensity modulated signal by the optical filter unit that performs phase-shift-keying to amplitude-shift-keying conversion. For example, an optical phase modulating unit generates an encoded DPSK phase modulated signal using a differential phase shirt keying (DPSK) format, and a phase modulated signal is converted to an RZ intensity modulated signal by the optical filter unit disposed downstream of the optical phase modulating unit.

  Recently Added Patents
Liquid composite compositions using non-volatile liquids and nanoparticles and uses thereof
Image capture apparatus and program
Lighting control device and lighting control method
Method, apparatus or computer program for changing from scheduled to unscheduled communication modes
Semiconductor IC including pulse generation logic circuit
String changing tool with a quick connector assembly and worm gear string cutter
Dimmer system and damper circuit thereof
  Randomly Featured Patents
Voltage stabilization circuit and semiconductor memory apparatus using the same
Method and system for recognizing a boundary between contiguous sounds for use with a speech recognition system
Control device for controlling current passing through a motor
Resilient connector having an insertable stop member
Absorbent article with non-irritating refastenable seams
Optical system for electric vehicle docking
Hemerocallis plant named `SPd 06-11`
Data processing system and method
Releasable plug coupling with protective sleeve
Process concentrate and dairy products