Photonics Research, Volume. 11, Issue 5, 742(2023)
Reconfigurable multichannel amplitude equalizer based on cascaded silicon photonic microrings
Fig. 1. (a) Schematic configuration of the proposed amplitude equalizer based on MRRs. (b) Top view of an MRR. (c) Cross section of the thermal-tuning region in the MRR.
Fig. 2. (a) Calculated spectral responses of the designed elliptical microring simulated by the 3D-FDTD method. (b) Simulated light propagation in the MRR working at the resonance wavelength near 1535 nm.
Fig. 3. Microscope images of the fabricated amplitude equalizer based on adiabatic elliptical microrings. (a) Eight-channel amplitude equalizer containing eight elliptical microring units. (b) Enlarged view of the focused grating coupler. (c) Enlarged view of the elliptical microring unit.
Fig. 4. (a) Transmission spectra at the through port of the eighth channel of the eight-channel amplitude equalizer as the applied voltage is increased from 0 to 0.8 V with a step of 0.02 V for the initialized state with uniform channel spacing of 200 GHz for clarity. (b) Measured resonance-wavelength shift as the power applied to the microheater increases. Here the chip was placed on the temperature controller set with different temperatures of 25°C, 35°C, 45°C, and 55°C, respectively. (c) Measured transmittances at the through port for the eighth operating wavelength as the heating power increases.
Fig. 5. Measured transmission spectra at the through port of the eight-channel amplitude equalizer with different operating states. (a) Device performance after fabrication when all the eight microheaters are OFF. (b) Nonattenuation state with all the eight resonance wavelengths initialized to be deviated from the operating wavelengths by half of the channel spacing. Full-attenuation states when tuning some resonance peaks to be aligned with some of the operating wavelengths: (c)
Fig. 6. Measured transmission spectra at the through port of the eight-channel amplitude equalizer when the resonance peaks of adjacent wavelength-channels are tuned to be overlapped with each other. Attenuation states when tuning some resonance peaks to be aligned with some of the operating wavelengths. (a)
Fig. 7. Measured results
|
Get Citation
Copy Citation Text
Changping Zhang, Shujun Liu, Hao Yan, Dajian Liu, Long Zhang, Huan Li, Yaocheng Shi, Liu Liu, Daoxin Dai. Reconfigurable multichannel amplitude equalizer based on cascaded silicon photonic microrings[J]. Photonics Research, 2023, 11(5): 742
Category: Silicon Photonics
Received: Dec. 20, 2022
Accepted: Feb. 16, 2023
Published Online: Apr. 23, 2023
The Author Email: Daoxin Dai (dxdai@zju.edu.cn)