General IIR optical filter design for WDM applications using all-pass filters

• Published in: Journal of lightwave technology Vol. 18; no. 6; pp. 860 - 868
• Main Author: Madsen, C.K.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.06.2000; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithm design and analysis; Applied sciences; Band pass filters; Circuit properties; Electric, optical and optoelectronic circuits; Electronics; Equalizers; Exact sciences and technology; Finite impulse response filter; Frequency; Gain; IIR filters; Impulse response; Integrated optics. Optical fibers and wave guides; Mathematical analysis; Multichannel; Optical amplifiers; Optical and optoelectronic circuits; Optical design; Optical filters; Selectors; Stimulated emission; Tolerances; Wavelength division multiplexing; Infinite impulse response filter; Waveform; Integrated optics; System architecture; System response; Optical telecommunication; Wavelength division multiplexing; Equalization; Algorithm; Frequency selector; Optimal design; Multichannel filter; All pass filter; Experimental result; Optical filter; Band pass filter; Finite impulse response filter; Optical waveguide; Frequency response; Multiple channel
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/50.848399

A general design algorithm is presented for infinite impulse response (IIR) bandpass and arbitrary magnitude response filters that use optical all-pass filters as building blocks. Examples are given for an IIR multichannel frequency selector, an amplifier gain equalizer, a linear square-magnitude response, and a multi-level response. Major advantages are the efficiency of the IIR filter compared to finite impulse response (FIR) filters, the simplicity of the optical architecture, and its tolerance for loss. A reduced set of unique operating states is discussed for implementing a reconfigurable multichannel selection filter.