Method of putting binary data on an optical carrier wave, and a

Details Method of putting binary data on an optical carrier wave, and a Method of putting binary data on an optical carrier wave, and a

1996-05-21

1999-12-07

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359181, 359182, 359248, 385 3, 385 10, H04B 1000, H04B 1004, G02F 103, G02F 1035

Patent

active

059992972

ABSTRACT:
In a transmission system, a control circuit (4) receives an input binary sequence (T) representing data to be transmitted. The circuit encodes the sequence using a phase alternation code which differs from the phase inversion duobinary code in that the phase shifts applied to a carrier wave are less than 90 degrees. For this purpose, a semiconductor chip (3) includes a laser transmitter and an electro-absorption modulator having two segments. The chip generates said carrier wave and modulates it using the encoded sequence. An optical fiber (54) conveys the modulated wave. And a detector diode (58) receives the conveyed wave and performs intensity discrimination thereon so as to restore the input binary sequence.

REFERENCES:
patent: 4979185 (1990-12-01), Bryans et al.
patent: 5144469 (1992-09-01), Brahms et al.
patent: 5611003 (1997-03-01), Lesterlin
patent: 5706117 (1998-01-01), Imai et al.
A. J. Price et al, "Reduced bandwidth optical digital intensity modulation with improved chromatic dispersion tolerance," Electronics Letters, vol. 31, No. 1, Jan. 5, 1995, Stenvenage GB, pp. 58-59.
Toshiyuki Itoh et al, "Coded Continuous Phase Modulation Combined with Nonuniform Mapping and Multi-H Scheme", IEEE Global Telecommunications Conference & Exhibition, Hollywood, Nov. 28-Dec. 1988, vol. 2 of 3, No. 27.5, Nov. 28, 1988--Institute of Electronics Engineers, pp. 865-869.

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