Reconfigurable photonic RF filters based on integrated Kerr frequency comb sources

Abstract

We demonstrate two categories of photonic radio frequency (RF) filters based on integrated optical micro-combs. The first one is based on the transversal filtering structure and the second one is based on the channelization technique. The large number of wavelengths brought about by the microcomb results in a significantly increased RF spectral resolution and a large instantaneous bandwidth for the RF filters. For the RF transversal filter, we demonstrated Q factor enhancement, improved out-of-band rejection, tunable centre frequency, and reconfigurable filtering shapes. While a high resolution of 117 MHz, a large RF instantaneous bandwidth of 4.64 GHz, and programmable RF transfer functions including binary-coded notch filters and RF equalizing filters with reconfigurable slopes are demonstrated for the RF channelized filter. The microcomb-based approaches feature a potentially much smaller cost and footprint, and is promising for integrated photonic RF filters.

4 pages, 5 figures, 32 references. arXiv admin note: substantial text overlap with arXiv:1903.08541

References in corpus (4)

• All-optical signal processing platforms for CMOS compatible integrated nonlinear optics
• Photonic radio frequency and microwave intensity differentiator based on an optical frequency comb source in an integrated micro-ring resonator
• Novel architecture for ultra-stable micro-ring resonator based optical frequency combs
• Ultra-pure RF tone from a micro-ring resonator based optical frequency comb source