Photonic radio frequency and microwave intensity differentiator based on an optical frequency comb source in an integrated micro-ring resonator

Xingyuan Xu; Jiayang Wu; Mehrdad Shoeiby; Thach G. Nguyen; Sai T. Chu; Brent E. Little; Roberto Morandotti; Arnan Mitchell; David J. Moss

doi:10.1063/1.4989871

arXiv · 1710.00678

Photonic radio frequency and microwave intensity differentiator based on an optical frequency comb source in an integrated micro-ring resonator

Xingyuan Xu·Jiayang Wu·Mehrdad Shoeiby·Thach G. Nguyen·Sai T. Chu·Brent E. Little·Roberto Morandotti·Arnan Mitchell·David J. Moss

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Abstract

We propose and experimentally demonstrate a microwave photonic intensity differentiator based on a Kerr optical comb generated by a compact integrated micro-ring resonator (MRR). The on-chip Kerr optical comb, containing a large number of comb lines, serves as a high-performance multi-wavelength source for implementing a transversal filter, which will greatly reduce the cost, size, and complexity of the system. Moreover, owing to the compactness of the integrated MRR, frequency spacings of up to 200-GHz can be achieved, enabling a potential operation bandwidth of over 100 GHz. By programming and shaping individual comb lines according to calculated tap weights, a reconfigurable intensity differentiator with variable differentiation orders can be realized. The operation principle is theoretically analyzed, and experimental demonstrations of first-, second-, and third-order differentiation functions based on this principle are presented. The radio frequency (RF) amplitude and phase responses of multi-order intensity differentiations are characterized, and system demonstrations of real-time differentiations for a Gaussian input signal are also performed. The experimental results show good agreement with theory, confirming the effectiveness of our approach.

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Xingyuan Xu, Jiayang Wu, Mehrdad Shoeiby, Thach G. Nguyen, Sai T. Chu, Brent E. Little, Roberto Morandotti, Arnan Mitchell, David J. Moss. 2017-09-27. Photonic radio frequency and microwave intensity differentiator based on an optical frequency comb source in an integrated micro-ring resonator. https://doi.org/10.1063/1.4989871

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