Optical transmission system

Details Optical transmission system Optical transmission system

1988-11-10

1989-11-07

Sikes, William L.

350 9616, G02B 626

Patent

active

048787264

ABSTRACT:
To prevent an interruption of service due to a break in an optical fiber, the information being transmitted is normally sent along two diversely routed lightwave paths using two complete transmitter sections, one for each path. Briefly, in this invention a single optical transmitter which can be an optical modulator such as a lithium niolate switch is used to impress a digital signal on a CW optical beam to obtain two digital optical outputs. One output is normally used as the modulated line signal for one of two diversely routed paths. The other output, which is the complement of the modulated signal, is used as the modulated line signal for the other of the two diversely routed paths. When the complement of the signal is detected, complementation can be performed to retrieve the original bit pattern. The advantages over the prior art are significant. For example, only one tansmitter is required. The laser is on continuously and, therefore, there is no chirp. The power (average) is directed 50% of the time to one output and 50% of the time to the other output. Thus, power loss is at a minimum.

REFERENCES:
patent: 4705350 (1987-11-01), Cheng
patent: 4755016 (1988-07-01), DeLoach, Jr. et al.
patent: 4777433 (1988-10-01), Steele et al.
Integrated Optical Circuits and Components Design and Application Edited by Lynn D. Hutcheson, p. 177, FIG. 6.2 and p. 221, FIG. 6.30, Published by Marcel Dekker, Inc., New York and Basel.

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