Optical communication system with bipolar input signal

Details Optical communication system with bipolar input signal Optical communication system with bipolar input signal

1975-08-01

1977-01-04

Safourek, Benedict V.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

178 67, 178 68, 325 38A, 340347DD, H04B 900

Patent

active

040015785

ABSTRACT:
A bipolar electrical signal of the type transmitted in the T1 digital transmission system is converted into an optical binary signal having pulses and spaces by translating each positive digital "1" in the bipolar signal into two digital pulses, each negative digital 1 in the bipolar signal into two spaces, and the digital 0 in the binary signal into an optical pulse followed by a space. The nonpermitted code of a space followed by an optical pulse is utilized at the receiving location for instantaneous framing. As a result of this particular code conversion, the balanced property of the bipolar input signal is maintained in the optical signal thereby preventing an offset bias from developing at the receiving location in the photodetector. In addition, the bipolar information is maintained in transmission, thus making the optical system "transparent" to bipolar signals.

REFERENCES:
patent: 3569955 (1971-03-01), Maniere
patent: 3809908 (1974-05-01), Clanton
patent: 3815122 (1974-06-01), Schwartz
Takasaki et al., "Line Coding Plans for Fiber Optic Communication Systems" Conf. Record vol. II, International Conf. on Comm. S.F. Cal. pp. 32-20 to pp. 32-24; June 16, 1975 to June 18, 1975.
Takasaki et al., "Line Coding Plan for Fiber Optic Communication Systems" Proceedings of IEEE, July 1975, pp. 1081-1082.

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