Resources Contact Us Home
Optical transmitter and optical transmission system

Image Number 14 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
Biomarker for Barrett's Oesophagus
Navigation apparatus, search result display method, and graphical user interface
System and method for updating firmware
Spread spectrum communication system and transmission power control method therefor
Method of preparing enteric hard capsule and enteric hard capsule prepared thereby
Haloalky -substituted amides as insecticides and acaricides
Smooth silicon-containing films
  Randomly Featured Patents
Image forming apparatus, method for forming an image, computer-readable storage medium, and computer system
Adducts of macrocyclic chelants
Keyboard and keyswitch
Analog reconstruction circuit and bar code reading apparatus employing same
Toy fabrication device for decorative discs
Using a cleaning cloth impregnated with coupling agent for adhesive films
Facility for the thermal treatment of workpieces
Slope etch of polyimide
Method of setting the time duration of illumination from an LED-based illumination array employed in a digital imaging-based code symbol reader, using an image-processing based illumination me
Lock device for latching different casings of a portable electronic device and portable electronic device therewith