Optical amplifiers

Details Optical amplifiers Optical amplifiers

1991-10-29

1993-03-02

Ullah, Akm E.

Optical waveguides

With optical coupler

Particular coupling function

359134, G02B 600, G02B 636

Patent

active

051916282

ABSTRACT:
A practical fibre Raman amplifier for soliton systems which employs conventional transmission fibre (4) and a pulsed pump source (3). The pump source only requires a relatively low mean power level but must be capable of providing sufficiently high peak output power pulses at intervals corresponding to the intervals between solitons whereby to amplify the latter. A conventional mode-locked laser diode source can achieve this at the requisite wavelength. The use of such a pulsed pump source is possible since the solitons have to be spaced at intervals approximately 8 to 10 times their pulse width in order to avoid interaction problems. Conventionally, Raman amplification requires high means power continuous wave pump sources and suitable laser diode sources are not available at the requisite wavelengths.

REFERENCES:
patent: 4558921 (1985-12-01), Hasegawa et al.
patent: 4633524 (1986-12-01), Hasegawa
patent: 4700339 (1987-10-01), Gordon et al.
patent: 4741587 (1988-05-01), Jewell et al.
patent: 4881788 (1989-11-01), Doran
patent: 5035481 (1991-07-01), Mollenauer

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