A reconsideration of birefringent interleaver

Chi-Hao Cheng

doi:10.1117/12.701532

20 February 2007 A reconsideration of birefringent interleaver

Chi-Hao Cheng

Proceedings Volume 6469, Optical Components and Materials IV; 646917 (2007) https://doi.org/10.1117/12.701532
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

Wavelength interleaver is an important component of dense wavelength division multiplexing systems. Various techniques are proposed to implement the wavelength interleaver. Among these approaches, the one based on the birefringent crystal might be the first ever been proposed and manufactured. The birefringent wavelength interleaver has a de facto standard structure consisting of n pieces of birefringent crystal with designed rotation angles. One important yet often overlooked issue regarding this structure is worthy of discussion. It is well known that the lossless finite impulse response (FIR) filter pair can be used to model the "standard" birefringent interleaver without material loss, and a "standard" interleaver consisting of n pieces of birefringent crystals implements nth-order Z-transform transfer functions. However, it is seldom mentioned that, this popular birefringent interleaver diagram can not represent arbitrary nth-order Z-transform functions of a lossless FIR filter pair. In other words, for an nth-order lossless FIR filter whose transfer function is derived from signal processing theory, it might not be feasible with the standard birefringent wavelength interleaver diagram. This fact makes it difficult to apply signal processing techniques to birefringent wavelength interleaver design. In this article, we present an alternative birefringent wavelength interleaver diagram to solve this problem.

Citation Download Citation

Chi-Hao Cheng "A reconsideration of birefringent interleaver", Proc. SPIE 6469, Optical Components and Materials IV, 646917 (20 February 2007); https://doi.org/10.1117/12.701532

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KEYWORDS

Polarization

Crystals

Finite impulse response filters

Image quality standards

Mach-Zehnder interferometers

Filtering (signal processing)

Optical filters

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