Scalable Bandwidth-Tunable Micro-Ring Filter Based on Multi-Channel-Spectrum Combination

We propose and experimentally demonstrate a scalable bandwidth-tunable bandpass filter on silicon. Its spectrum is combined by that of four channels and each channel is formed by two cascaded micro-ring resonators (MRRs). By tuning the center wavelength spacing of the eight MRRs and the phase shifts...

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Bibliographic Details
Published in:IEEE photonics technology letters 2018-06, Vol.30 (11), p.1044-1047
Main Authors: Dai, Tingge, Wang, Gencheng, Guo, Xiaoqin, Bei, Chen, Jiang, Jianfei, Chen, Weiwei, Wang, Yuehai, Yu, Hui, Yang, Jianyi
Format: Article
Language:English
Subjects:
Band-pass filters
Bandwidth
bandwidth tunable
Heating systems
Loss measurement
microring resonator
Optical filters
Phase shifters
Photonic integrated circuits
Resonator filters
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Summary:We propose and experimentally demonstrate a scalable bandwidth-tunable bandpass filter on silicon. Its spectrum is combined by that of four channels and each channel is formed by two cascaded micro-ring resonators (MRRs). By tuning the center wavelength spacing of the eight MRRs and the phase shifts of four channels, a wide bandwidth tuning range from 37.5 GHz to 227.5 GHz can be achieved with a shape factor between 0.2 and 0.73 and an in-band ripple less than 1 dB. By comparing with the performance of three-channel and two-channel structures, we can draw the conclusion that inducing more channels can effectively improve the bandwidth tunability. The filter also has a wide free spectral range (about 1.2 THz) and small footprint (0.12 mm 2 ).
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2018.2826724