Journal
ACS PHOTONICS
Volume 7, Issue 9, Pages 2539-2546Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c00848
Keywords
optical all-pass filters; phase manipulations; microring resonators; complex plane; microwave photonic phase shifters; silicon photonics
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Funding
- National Key R&D Program of China [2018YFB2201700]
- National Natural Science Foundation of China [61975249, 11664009]
- Program for HUST Academic Frontier Youth Team [2018QYTD08]
- Natural Science Foundation of Hubei Province [2016CFB370]
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Optical all-pass filters, which exhibit constant amplitude response and pure phase variation, are extremely desired when only optical phase manipulation is required. However, many reported all-pass filters are accompanied by amplitude variations, which could degrade their performance. In this study, an all-pass filter is designed with constant amplitude and pure phase variation based on the analysis of the microring resonator response in the complex plane. The all-pass filter makes use of optical interference between the outputs of an all-pass microring resonator and a straight waveguide. Based on a silicon-on-insulator wafer, the all-pass filter is fabricated and its application to a microwave photonic phase shifter is also investigated. The all-pass filter exhibits a maximal magnitude variation of approximately 1.2 dB and a phase shift of 1.97 pi and can be continuously and widely tuned. This work offers a new approach to manipulate pure optical phases to improve the performance of optical devices and systems.
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