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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 22, Iss. 7 — Jul. 1, 2004
  • pp: 1811–

Photonic Notch Filter Without Optical Coherence Limitations

E. H. W. Chan and R. A. Minasian

Journal of Lightwave Technology, Vol. 22, Issue 7, pp. 1811- (2004)


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Abstract

A new topology for a photonic notch filter that can solve the coherent interference problem in photonic signal processors is presented in this paper. It is based on a double-pass modulation technique. The key advantage of this new structure is that it completely removes the dominant phase noise limitation, which is a fundamental problem with existing incoherent processor approaches. It also enables arbitrary narrow-linewidth telecommunication-type lasers to be used with stable and robust filter operation. Extensions to obtain tunable notch frequency and wide-passband notch filter operation are presented. Results demonstrate robust notch filter operation with a narrow-linewidth source, no phase-induced intensity noise, and a vastly superior signal-to-noise ratio performance (i.e., a nearly 60-dB increase) compared with the conventional delay line notch filter. Tunable coherence-free operation of the notch filter is also shown. Finally, a new structure that not only operates without coherence limitations but also realizes a notch filter with a wide passband of more than 50% of the free spectral range is demonstrated.

© 2004 IEEE

Citation
E. H. W. Chan and R. A. Minasian, "Photonic Notch Filter Without Optical Coherence Limitations," J. Lightwave Technol. 22, 1811- (2004)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-22-7-1811

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