Optical transmission system

Details Optical transmission system Optical transmission system

1993-02-22

1995-06-06

Moore, David K.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359187, 359191, 359194, H04B 1004

Patent

active

054227526

ABSTRACT:
An optical transmission system utilizing at a transmitter (100) continuous phase frequency shift keyed modulation of a laser (14) and a coherent heterodyne receiver (200) therefor, the system including at the transmitter means for imposing (18,12) a low frequency modulation on the transmitter optical power and frequency deviation and at the receiver means for extracting (28) from the receiver AGC control signal a replica of the low frequency modulation, means for demodulating (32) the modulated frequency deviation of the received optical signal synchronously with respect to the extracted low frequency signal, means for deriving (34) from the demodulated signal an error signal and a control system responsive to the error signal to control the receiver local oscillator (22) frequency.

REFERENCES:
patent: 4912527 (1990-03-01), Yamazaki
patent: 4955026 (1990-09-01), Hill et al.
patent: 5142402 (1992-08-01), Tsushima
patent: 5200967 (1993-04-01), Miyata
patent: 5247382 (1993-09-01), Suzuki
patent: 5307197 (1994-04-01), Tanabe et al.
Bryant, et al., "A 1.2 Gbit/s optical FSK field trial demonstration", Br. Telecom Technol J., vol. 8, No. 2, Apr. 1980, pp. 18-26.
Hardcastle, et al., "High Performance 140 Mbit/s FSK Coherent System", Electronics Letters, vol. 26, No. 18, Aug. 30, 1990, pp. 1523-1524.

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