H - Electricity – 04 – L
Patent
H - Electricity
04
L
325/1
H04L 25/22 (2006.01) H04B 10/155 (2006.01)
Patent
CA 1053758
OPTICAL COMMUNICATION SYSTEM WITH BIPOLAR INPUT SIGNAL Abstract of the Disclosure 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 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. - 1 -
247939
Cook John S.
Personick Stewart D.
Na
Western Electric Company Incorporated
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