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【Objective】The Array Waveguide Grating Router (AWGR) constructed in the form of an N×N matrix has optical parallelism and wavelength routing capabilities. It can simultaneously transmit N signals on different channels, and has advantages of good scalability, low latency, and wide bandwidth. Combined with tunable harmonic light sources, it can achieve fast optical switching, which is one of the potential technical solutions for the next generation of optical switching data center networks. In order to solve the problems of high crosstalk, additional coupling loss, polarization sensitivity, and non-uniformity of existing AWGR that may affect practical applications, this paper studied AWGR with 4×4 channels and 12×12 channels respectively to further expand the scale of data centers and improve the data exchange speed.【Methods】The basic design parameters were calculated using simulation software, and the AWGR design process was analyzed and studied. The Beam Propagation Method (BPM) was used for simulation. At the same time, performance optimization is carried out by adding a conical waveguide tap structure at the connection between the flat waveguide and the strip waveguide, increasing the spacing between the input and output waveguides.【Results】The simulation results show good performance parameters: 4×4 AWGR insertion loss of -0.714 dB, crosstalk of -35.556 dB, loss non-uniformity of 1.907 dB; 12×12 AWGR insertion loss of -0.294 dB, crosstalk of -36.019 dB, loss non-uniformity of 3.428 dB. The designed device chips are then fabricated and tested on the optical platform. The test results indicate: 4×4 AWGR insertion loss of -2.586 dB, crosstalk of -29.473 dB, loss non-uniformity of 1.921 dB; 12×12 AWGR insertion loss of -3.692 dB, crosstalk of -23.874 dB, loss non-uniformity of 3.873 dB.【Conclusion】This article investigates the performance optimization in areas such as crosstalk and non-uniformity of losses, accumulating experience for subsequent design iterations and further improving the performance parameters. |
