Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 24, Pages 7551-7562Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3093201
Keywords
Optical ring resonators; Integrated optics; Optical modulation; Optical polarization; Optical distortion; Optical fiber communication; Optical attenuators; Integrated microwave photonics; linearization; optical spectral shaping; spurious-free dynamic range
Funding
- Netherlands Organisation for Scientific Research NWO [15702, 740.018.021]
- Chinese Scholarship Council
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Integrated microwave photonics is a rapidly growing area that processes high frequency microwave signals in the optical domain, combining the advantages of microwave photonics and photonic integrated circuits. Many functionalities have been demonstrated in integrated MWP, but on-chip linearization remains a challenge. Investigating on-chip linearization methods is crucial for advanced integrated MWP systems with large SFDR.
Integrated microwave photonics (MWP) is a fast growing area where high frequency microwave signals are processed in the optical domain, merging key advantages of both microwave photonics and photonic integrated circuits (PICs) technologies including low-loss, reconfigurability, advanced functionality, enhanced stability, and reduced footprint. Plenty of functionalities have been demonstrated in integrated MWP, especially based on spectral shaping technique, where the phase and amplitude of the optical spectrum is precisely tailored by PICs. However, on-chip linearization is lagging behind and has not been investigated deeply. It is crucial and urgent to study on-chip linearization methods, which will lead to advanced integrated MWP systems with large spurious-free dynamic range (SFDR). In this paper, we present two novel techniques for on-chip linearization of microwave photonic links. The first technique is based on line-by-line complex spectral shaping using a series of ring resonators. The second technique relies on spatial separation to achieve parallel spectral shaping in two complementary spatial channels. Both methods are demonstrated in low-loss programmable silicon nitride circuits that can already host a number of advanced functionalities. Our results point to the great potential of integrating advanced functionalities and linearization in the same integrated platform.
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