Parallel-cascaded micro-ring resonators waveguide photodetector with flat-top and steep-edge response

A novel waveguide photodetector with flat-top and steep-edge response is proposed in the paper. The response is obtained by designing a racetrack resonator following parallel-cascaded two or three micro-ring resonators. Its maximum values of the quantum efficiency in bandpass are 99.8%; 0.5dB, 3dB, and 20dB bandwidth is 0.22nm, 0.39nm, and1.1nm for cascaded double structure and 0.28nm, 0.32nm, and 0.5nm for cascaded triple structure, both of which meet the requirements of WDM system. Compared with similar waveguide photodetectors and RCE-PD, this photodetector has high quantum efficiency, narrow line width and good flat-top and steep-edge response. The structure is compact and conducive to chip-scale integration.

[1]  S. Kanakaraju,et al.  A tunable GaInAsP-InP optical microring notch filter , 2004, IEEE Photonics Technology Letters.

[2]  J. Muszalski,et al.  Resonant cavity enhanced photonic devices , 1995 .

[3]  V. Ahmadi,et al.  Design and analysis of resonant cavity enhanced-waveguide photodetectors for microwave photonics applications , 2006, IEEE Photonics Technology Letters.

[4]  X. Ren,et al.  Flat-top steep-edge photodetector with cascaded grating structure , 2009, 2009 Asia Communications and Photonics conference and Exhibition (ACP).

[5]  A. Yariv.  Critical coupling and its control in optical waveguide-ring resonator systems , 2002, IEEE Photonics Technology Letters.

[6]  Yasuo Kokubun,et al.  Box-like filter response and expansion of FSR by a vertically triple coupled microring resonator filter , 2002 .

[7]  Vien Van,et al.  Ultracompact SOI Microring Add–Drop Filter With Wide Bandwidth and Wide FSR , 2009, IEEE Photonics Technology Letters.

[8]  G. Griffel,et al.  Vernier effect in asymmetrical ring resonator arrays , 2000, IEEE Photonics Technology Letters.

[9]  T. Kaneko,et al.  Second-order filter response from parallel coupled glass microring resonators , 1999, IEEE Photonics Technology Letters.

[10]  Minghao Qi,et al.  Silicon-on-Insulator Microring Add-Drop Filters With Free Spectral Ranges Over 30 nm , 2008, Journal of Lightwave Technology.

[11]  Qianfan Xu,et al.  Micrometre-scale silicon electro-optic modulator , 2005, Nature.

[12]  Vien Van,et al.  Parallel-cascaded semiconductor microring resonators for high-order and wide-FSR filters , 2002 .