Generation of a sequence of optical pulses and communication...

Details Generation of a sequence of optical pulses and communication... Generation of a sequence of optical pulses and communication...

G - Physics

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G02B 6/26 (2006.01) G02F 1/00 (2006.01) G02F 1/35 (2006.01) H01S 3/00 (2006.01) H01S 3/30 (2006.01)

Patent

CA 1253210

- 16 - GENERATION OF A SEQUENCE OF OPTICAL PULSES AND COMMUNICATION SYSTEM USING SUCH PULSES Abstract Optical pulses of nominal frequency fo and of predetermined repetition rate t?1 can be generated by means of the induced modulational instability in single mode optical fiber, provided the fiber has anomalous dispersion at fo. The method involves coupling (15, 15') first (13) and second (14) cw or quasi cw optical radiation, of frequencies f1 and f2, respectively, into the optical fiber (17). The resultant radiation in the fiber has frequency fo between f1 and f2, and is sinusoidally modulated with frequency ?f1-f2?. 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 tp<tM/4' preferably <tM/10.

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