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This paper describes an in-line optical phase-sensitive amplifier (PSA) with a pump laser whose optical phase is locked to that of a randomly modulated signal by using an optical phase-lock loop (OPLL). The OPLL is designed with the capability of optical phase locking at an arbitrary relative phase. Experimental evaluation is presented of the OPLL employing a newly developed external cavity semiconductor ring laser with a spectrum linewidth of less than 20 kHz. Employing this pump laser with the OPLL in conjunction with a 4.4-km long nonlinear fiber Sagnac interferometer (NFSI) yields optical phase-sensitive gain of up to 11 dB. A randomly modulated signal is successfully amplified and confirmed offering a clear eye-opening
Published in:
Lightwave Technology, Journal of
(Volume:17
,
Issue:
4
)
Date of Publication: Apr 1999
- Page(s):
- 637 - 646
- ISSN :
- 0733-8724
- INSPEC Accession Number:
- 6228456
- Digital Object Identifier :
- 10.1109/50.754794
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- Apr 1999
- Sponsored by :
- IEEE Aerospace and Electronic Systems Society
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