Double-pass Raman amplifier for gain enhancement and gain clamping

作者：Ahmad H; Norizan S F; Hamzah A; Harun S W^*

来源：Optoelectronics and Advanced Materials-Rapid Communications, 2009, 3(9): 924-926.

• Raman amplification
• Discrete Raman amplifier
• Double-pass DRA

A double-pass discrete Raman amplifier (DRA) is demonstrated using a broadband fiber Bragg grating for gain enhancement and gain clamping. With the use of Truewave Reach fiber as a gain medium, maximum on/off gain improvement of 5 dB is achieved in C-band region However, the proposed double-pass configuration cannot increase the maximum achievable gain in DRA since almost no gain improvement is observed with a piece of 50km long standard single mode fiber With dispersion compensating fiber as a gain medium, the gain of double-pass DRA is clamped at 19dB for the small input signal This shows that the double-pass scheme is a promising candidate to perform gain clamping without an optical feedback The proposed double-pass DRA can also remarkably shorten the fiber length used and reduce the device size of the amplifier

• 出版日期2009-9