Microwave photonic filter design via optical frequency comb shaping

Minhyup Song, Purdue University

Abstract

The field of microwave photonics (MWP), where the wideband and low-loss capability in optics is utilized to enhance the performance of radio frequency (RF) systems, has been significantly explored over the last decades. This perspective offers benefits that are unattainable with conventional electronics solutions, such as ultra-broad bandwidth, insensitivity to electromagnetic interference, transport through optical fiber networks, easy tuning control, or programmability. One important application of microwave photonics is the implementation of microwave filters for high carrier frequency and wide bandwidth RF waveform. In this thesis, MWP filters based on an optical frequency combs (OFCs) and a dispersive medium are presented. First, noise evaluation of MWP filters based on OFCs is explored to show the potential of optical frequency comb technology to operate over large distances in MWP filter links. Then, amplitude and phase control complex coefficient taps MWP filters are presented. We demonstrate reconfigurable and tunable flat-top MWP filters by applying positive and negative weights across the comb lines and adding a phase ramp onto the tap weights. Furthermore the application of this technique to phase filtering operation over an ultra-wide bandwidth will be demonstrated through high-speed real-time measurement. We present the implementation of matched filter to compress the chirped pulses to their bandwidth limited duration. We also explore the group delay ripple (GDR) compensation of chirped fiber Bragg grating (CFBG) which would reduce the delay of MWP filter links.

Degree

Ph.D.

Advisors

Weiner, Purdue University.

Subject Area

Engineering|Electrical engineering

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