Broadband Sagnac Raman amplifiers and cascade lasers

Details Broadband Sagnac Raman amplifiers and cascade lasers Broadband Sagnac Raman amplifiers and cascade lasers

1998-07-07

2000-04-18

Healy, Brian

Coherent light generators

Optical fiber laser

372 21, 372 22, 372 70, 372 71, 372 72, 372 94, 372 99, 356345, 359115, 359127, 359134, 359341, 359345, 359346, 385 39, 385 42, 385122, H01S 330, G01B 902, H04J 1400, G02B 626

Patent

active

06052393&

ABSTRACT:
This invention describes new developments in Sagnac Raman amplifiers and cascade lasers to improve their performance. The Raman amplifier bandwidth is broadened by using a broadband pump or by combining a cladding-pumped fiber laser with the Sagnac Raman cavity. The broader bandwidth is also obtained by eliminating the need for polarization controllers in the Sagnac cavity by using an all polarization maintaining configuration, or at least using loop mirrors that maintain polarization. The polarization maintaining cavities have the added benefit of being environmentally stable and appropriate for turn-key operation. The noise arising from sources such as double Rayleigh scattering is reduced by using the Sagnac cavity in combination with a polarization diversity pumping scheme, where the pump is split along two axes of the fiber. This also leads to gain for the signal that is independent of the signal polarization. Finally, a two-wavelength amplifier for 1310 nm and 1550 nm can be implemented by using a parallel combination of Raman amplifiers with shared pump lasers or by combining Raman amplifiers with erbium-doped fiber amplifiers. Combinations of the above improvements can be used advantageously to meet specifications for broad bandwidth, polarization independence, noise performance and multi-wavelength operation.

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Sato et al., "A 1.6 .mu.m Band OTDR Using a Synchronous Raman Fiber Amplifier," IEEE Photonics Technology Letters, Aug. 1992, pp. 923-925.
Chernikov et al., "High-gain, monolithic, cascaded fibre Raman amplifier operating at 1.3 .mu.m," Electronics Letters, Mar. 16, 1995, vol. 31, No. 6, pp. 472-473.
Dianov et al., "Demonstration of 1.3-.mu.m Raman Fiber Amplifier Gain of 25 dB at a Pumping Power of 300 mW," Optical Fiber Technology, Mar. 22, 1995, vol. 1, pp. 236-238.
Chernikov et al., "High-power, compact, high-efficiency, fiber laser source around 1.24 .mu.m for pumping Raman amplifiers," Technical Digest of the Optical Fiber Communications Conference, Feb. 1997.

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