Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1986-02-20
1988-05-03
Sikes, William L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350 9616, 350 9629, 350320, 455610, 455611, 455612, G02B 626, G02F 100
Patent
active
047415878
ABSTRACT:
Optical pulses of nominal frequency f.sub.o and of predetermined repetition rate .tau..sub.M.sup.-1 can be generated by means of the induced modulational instability in single mode optical fiber, provided the fiber has anomalous dispersion at f.sub.o. A particularly advantageous method for generating such pulses that is capable of very high repetition rates is disclosed. The method involves coupling first and second cw or quasi cw optical radiation, of frequencies f.sub.1 and f.sub.2, respectively, into the optical fiber. Frequently one of the two radiations has much greater amplitude than the other. The resultant radiation in the fiber has frequency f.sub.o between f.sub.1 and f.sub.2, and is sinusoidally modulated with frequency .vertline.f.sub.1 -f.sub.2 .vertline.. Propagation of the resultant radiation through the fiber results in steepening and narrowing of the amplitude peaks. The length of the fiber typically is chosen such that, at the output, the pulse width .tau..sub.p <.tau..sub.M /4, preferably <.tau..sub.M /10. The inventive pulse generation method can advantageously be used in optical communications systems, e.g., in soliton systems. Other uses, e.g., in information processing apparatus, are also contemplated.
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Jewell Jack L.
Tai Kuochou
Tomita Akira
American Telephone and Telegraph Company AT&T Bell Laboratories
Healy Brian M.
Pacher Eugen E.
Sikes William L.
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