A Four-Channel DWDM Tunable Add/Drop Demultiplexer Based on Silicon Waveguide Bragg Gratings

We demonstrate a thermally tunable four-channel add/drop demultiplexer based on silicon grating-assisted contra-directional couplers (contra-DCs) for 200 GHz dense wavelength division multiplexing (DWDM) systems. In order to obtain the narrow bandwidth and the rapid roll-off necessary for the DWDM,...

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Bibliographic Details
Published in:IEEE photonics journal 2019-02, Vol.11 (1), p.1-8
Main Authors: Mu, Debin, Qiu, Huiye, Jiang, Jianfei, Wang, Xiaofei, Fu, Zhilei, Wang, Yuehai, Jiang, Xiaoqing, Yu, Hui, Yang, Jianyi
Format: Article
Language:English
Subjects:
Apodization
Bandwidth
Bandwidths
Bragg gratings
Couplings
demultiplexer
Dense Wavelength Division Multiplexing
Directional couplers
DWDM
filter
Gratings
Insertion loss
Integrated optics device
Optical filters
Optical waveguides
Ports
Sidelobe reduction
Sidelobes
Silicon
Wave division multiplexing
waveguides
Wavelength division multiplexing
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Summary:We demonstrate a thermally tunable four-channel add/drop demultiplexer based on silicon grating-assisted contra-directional couplers (contra-DCs) for 200 GHz dense wavelength division multiplexing (DWDM) systems. In order to obtain the narrow bandwidth and the rapid roll-off necessary for the DWDM, every wavelength channel is filtered dually by two identical contra-DCs cascaded in parallel. In addition, the phase apodization technique is utilized to suppress sidelobes. With these special designs, passbands of the four drop ports exhibit 3 and 20 dB bandwidths of 0.4 and 0.8 nm, respectively, while isolation between adjacent channels is better than 20 dB. Insertion losses at through and drop ports are 0.6 and ~2.6 dB, respectively. The maximal wavelength-tunable range is up to 25 nm.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2019.2897359