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Suppression of Phase-Induced Intensity Noise in Optical Delay-Line Signal Processors Using a Delayed Differential Technique

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2 Author(s)
Erwin Hoi Wing Chan ; Sch. of Electr. & Inf. Eng., Univ. of Sydney, Sydney, NSW, Australia ; Robert A. Minasian

In this paper, a new technique that can suppress the dominant phase-induced intensity noise (PIIN) in general delay-line signal processor structures is presented. It is based on a delayed differential technique using a complementary output electro-optic modulator together with appropriate time delay and polarization effects to cancel the PIIN noise at the filter passband frequency. Experimental results using the delayed differential technique demonstrate a PIIN noise reduction of 19 dB at the filter passband for an amplified recirculating delay-line bandpass filter, together with a fourfold increase in the free spectral range and a 10 dB increase in the bandpass filter rejection level.

Published in:

Journal of Lightwave Technology  (Volume:27 ,  Issue: 22 )