Linearized Optical Discriminator

We present design optimization techniques for linear optical frequency discriminator filters using cascaded lattice Mach-Zehnder interferometers (CLMZI). We propose a simple method for reducing the deviation in amplitude linearity, which relies on a slight reduction of the filter's full bandwid...

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Bibliographic Details
Published inJournal of lightwave technology Vol. 33; no. 2; pp. 386 - 390
Main Authors Serunjogi, Solomon M., Rasras, Mahmoud S.
Format Journal Article
LanguageEnglish
Published IEEE 15.01.2015
Subjects
Finite impulse response filters
Frequency response
Linear Phase
Linearity
Microwave filters
Nonlinear optics
Optical Discriminator
Optical filters
Optical interferometry
Parks McCllellan algorithm
Ring Assisted Mach-Zehnder Interferometer
Yule-Walker Moving Average
Parks–McCllellan algorithm
Yule–Walker
ring assisted
Linear phase
Mach–Zehnder interferometer
optical discriminator
moving average
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Summary:We present design optimization techniques for linear optical frequency discriminator filters using cascaded lattice Mach-Zehnder interferometers (CLMZI). We propose a simple method for reducing the deviation in amplitude linearity, which relies on a slight reduction of the filter's full bandwidth utilization (BWU). It is shown that a reduction in BWU as low as 5% can result in an order of magnitude improvement in the corresponding amplitude linearity. Additionally, by employing a generalized CLMZI (g-CLMZI) filter architecture with geometrically increasing delays, high linearity can be realized. For example, a three-stage (sixth order) g-CLMZI can provide deviation in linearity of less than 0.5% across the desired bandwidth. Both g-CLMZI and CLMZI architectures are optimized using nonlinear optimization techniques. Design examples of both filter types are given.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2014.2381240