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Double-pass Raman amplifier for gain enhancement and gain clamping

H. AHMAD1, S. F. NORIZAN1, A. HAMZAH1, S. W. HARUN2,*

Affiliation

  1. Photonics Research Center, University of Malaya, 50603 Kuala Lumpur, Malaysia
  2. Department of Electrical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia

Abstract

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.

Keywords

Raman amplification, Discrete Raman amplifier, Double-pass DRA.

Citation

H. AHMAD, S. F. NORIZAN, A. HAMZAH, S. W. HARUN, Double-pass Raman amplifier for gain enhancement and gain clamping, Optoelectronics and Advanced Materials - Rapid Communications, 3, 9, September 2009, pp.924-926 (2009).

Submitted at: March 19, 2009

Accepted at: Sept. 15, 2009