FSR-free silicon-on-insulator microring resonator based filter with bent contra-directional couplers.

High-speed optical interconnects drive the need for compact microring resonators (MRRs) with wide free spectral ranges (FSRs). A silicon-on-insulator MRR based filter with bent contra-directional couplers that exhibits an FSR-free response, at both the drop and through ports, while achieving a compact footprint is both theoretically and experimentally demonstrated. Also, using bent contra-directional couplers in the couping regions of MRRs allowed us to achieve larger side-mode suppressions than MRRs with straight CDCs. The fabricated filter has a minimum suppression ratio of more than 15 dB, a 3dB-bandwidth of ~23 GHz, an extinction ratio of ~18 dB, and a drop-port insertion loss of ~1 dB. High-speed data transmission through our filter is also demonstrated at data rates of 12.5 Gbps, 20 Gbps, and 28 Gbps.

[1]  L. Chrostowski,et al.  Process calibration method for designing silicon-on-insulator contra-directional grating couplers. , 2015, Optics express.

[2]  Wei Shi,et al.  Silicon photonic grating-assisted, contra-directional couplers. , 2013, Optics express.

[3]  Xiang Zhou,et al.  Optical interconnects: recent advances and future challenges. , 2015, Optics express.

[4]  Daoxin Dai,et al.  High-order microring resonators with bent couplers for a box-like filter response. , 2014, Optics letters.

[5]  Wei Shi,et al.  Ultra-compact, flat-top demultiplexer using anti-reflection contra-directional couplers for CWDM networks on silicon. , 2013, Optics express.

[6]  Jing Li,et al.  Electron beam lithography writing strategies for low loss, high confinement silicon optical waveguides , 2011 .

[7]  Hui Chen,et al.  On-Chip Optical Interconnect Roadmap: Challenges and Critical Directions , 2005, IEEE Journal of Selected Topics in Quantum Electronics.

[8]  A. Melloni,et al.  Experimental evaluation of ring resonator filters impact on the bit error rate in non return to zero transmission systems , 2004 .

[9]  Nicolas A. F. Jaeger,et al.  Grating-coupled silicon microring resonators , 2012 .

[10]  Lukas Chrostowski,et al.  Experimental performance of DWDM quadruple Vernier racetrack resonators. , 2013, Optics express.

[11]  L. Chrostowski,et al.  FSR-Eliminated Vernier Racetrack Resonators Using Grating-Assisted Couplers , 2013, IEEE Photonics Journal.

[12]  Linjie Zhou,et al.  Selective excitation of microring resonances using a pulley-coupling structure , 2014, 2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR).

[13]  Jeroen De Coster,et al.  Silicon photonics integrated circuits: a manufacturing platform for high density, low power optical I/O's. , 2015, Optics express.