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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 21, Iss. 10 — Oct. 1, 2003
  • pp: 2412–

Subband All-Pass Filter Architectures With Applications to Dispersion and Dispersion-Slope Compensation and Continuously Variable Delay Lines

C. K. Madsen

Journal of Lightwave Technology, Vol. 21, Issue 10, pp. 2412- (2003)


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Abstract

A new optical filter architecture is proposed that employs optical subband and all-pass filters but circumvents the typical tradeoff between passband width and peak delay inherent to all-pass filters. A filter design for a dispersion compensator with a tuning range of ± 1000 ps/nm and 95-GHz passband width on a 100-GHz grid is presented. Compared with a cascade architecture, a lower core-to-cladding index contrast for planar waveguide ring resonator implementations can be used, and lower filter losses are achieved, since the signal propagates through fewer all-pass filter stages for the same dispersion. A continuously variable delay line is designed with more than 90% bandwidth utilization. For a ten-stage all-pass filter with 25-GHz free spectral range (FSR) in a double-pass configuration,a 1000-ps continuous tuning range can be achieved. Finally, a dispersion-slope compensator design is presented with a change in dispersion of 700 ps/nm over a wavelength range determined by the filter FSR-to-channel-spacing ratio.

© 2003 IEEE

Citation
C. K. Madsen, "Subband All-Pass Filter Architectures With Applications to Dispersion and Dispersion-Slope Compensation and Continuously Variable Delay Lines," J. Lightwave Technol. 21, 2412- (2003)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-21-10-2412

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