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
Systems and methods for printing images outside a normal color gamut in image forming devices
Inter-cell power control in the presence of fractional frequency reuse
Server-side web analytics system and method
Electronic hand-held device
Motor assembly
Adaptive take-off strips for smoothing ink consumption
Method and system for modeling a common-language speech recognition, by a computer, under the influence of a plurality of dialects
  Randomly Featured Patents
Electron beam microfabrication apparatus and method
Gas barrier during edge rinse of SOG coating process to prevent SOG hump formation
Pickup head having two laser light sources for separately reading an optical disk with two recording layers
Benzofuran and benzothiophene sulfonamides
Spinwelded plastic pipe coupling joint
Geranium plant named `Gentred`
Hidden markov model based handwriting/calligraphy generation
Cleaning composition, pad, wipe, implement, and system and method of use thereof
Image forming apparatus, cutting device usable therewith and method thereof
Belt buckle