Optical pulse generator

Details Optical pulse generator Optical pulse generator

1997-01-13

1999-04-27

Scott, Jr., Leon

Coherent light generators

Optical fiber laser

372 25, 372 70, H01S 330

Patent

active

058987142

ABSTRACT:
An optical pulse generator, capable of generating ultrashort optical pulses suitable for optical soliton transmission, includes a DFB laser 10 for continuous laser oscillation, an electroabsorbtion modulator 12 for creating a sequence of optical pulses of the pulse width 14.6 ps from optical output of the laser 10. Output from an optical modulator 12 enters into a dispersion decreasing fiber 16 via an optical isolator 14. The dispersion decreasing fiber 16 has chromatic dispersion that decreases from 13.7 ps
m/km to 2.3 ps
m/km with distance, and its fiber length is 15 km. Pump laser beams from pump lasers 20, 24 are introduced to the dispersion decreasing fiber 16 by optical couplers 18, 22, and the fiber 16 functions as a Raman amplifier. When the Raman gain is 2.4 dB, the pulse width is compressed from 14.6 ps to 5.8 ps, approximately, even when the power of input pulses to the dispersion decreasing fiber 16 complies with the soliton condition.

REFERENCES:
patent: 5434693 (1995-07-01), Tanaka et al.
patent: 5659558 (1997-08-01), Tohmon et al.
patent: 5737460 (1998-04-01), Damen et al.
Morita et al., "Pre-emphasis Optical Soliton Compression Using DDF", The Institute of Electronics, Information and Communications Society Symposium 1995, p. 398.

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