Intensity modulated digital optical communications using a frequ

Optical: systems and elements – Deflection using a moving element – Using a periodically moving element

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

359114, 359130, 359185, 359188, H04B 1000

Patent

active

054166292

ABSTRACT:
In long distance digital and frequency modulation systems that use optical sources having optical frequency chirp, degradation due to optical dispersion in the transmission fiber is overcome by filtering the laser wavelength representative of one of the binary levels (e.g., binary "0"). An optical source such as a DFB laser is directly frequency modulated by a digital data stream. A first digital level is represented by a first intensity of the modulated carrier corresponding to a carrier wavelength .lambda..sub.1 and a second digital level is represented by a second intensity of the modulated carrier corresponding to a carrier wavelength .lambda..sub.2. A wavelength selective reflector is used to filter the wavelength .lambda..sub.1 from the modulated carrier. The modulated carrier, from which wavelength .lambda..sub.1 has been filtered, is then coupled to an optical communication path for transmission. In one embodiment the wavelength selective reflector is coupled to the laser output using an optical circulator. In another embodiment, a directional coupler is used.

REFERENCES:
patent: 4813756 (1989-03-01), Frenkel
patent: 4860294 (1989-08-01), Winzer
patent: 4953939 (1990-09-01), Epworth
patent: 5048909 (1991-09-01), Henry
patent: 5105295 (1992-04-01), O'Byrne
E. G. Bryant, et al., "Two-Way Transmission at 2.488 Gbit/s Over a 132 km Operational Submerged Cable Using Erbium-Doped Fibre Power Amplifiers," Electronics Letters, vol. 26, No. 17, Aug. 16, 1990, pp. 1355-1357.
E. G. Bryant, et al., "Unrepeatered 2.4 Gbit/s Transmission Experiment Over 250 km of Step-Index Fibre Using Erbium Power Amplifier," Electronics Letters, vol. 26, No. 8, Apr. 12, 1990, pp. 528-530.
K. O. Hill, "Fiber-Based Passive Components," OFC '92 Conference, San Jose, Calif., Feb. 4-7, 1992.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Intensity modulated digital optical communications using a frequ does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Intensity modulated digital optical communications using a frequ, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intensity modulated digital optical communications using a frequ will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-642280

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.