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Proceedings Paper

Silicon-based tunable optical delay lines and switches for next generation optical telecommunications
Author(s): Linjie Zhou; Jingya Xie; Liangjun Lu; Zuxiang Li; Jianping Chen
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Paper Abstract

We report our recent progress on reconfigurable optical true time delay lines (RTTDL) and optical switches. The RTTDL is composed of 8 stages of MZIs connected by 7 waveguide pairs with an incremental length difference. Variable optical attenuators are inserted in the delay waveguides to suppress crosstalk caused by the residual signals from noise paths. Transmission of a 25 Gbps PRBS signal confirms the signal fidelity after a maximum of 1.27 ns delay. The optical switch is based on a Benes architecture with Mach-Zehnder interferometers (MZI) as the switching elements. Both p-i-n diodes and silicon resistive micro-heaters are integrated in the MZI arms for electrical tuning and phase correction, respectively. The measured on-chip insertion loss of the 4×4 switch is < 8 dB. Transmission of a 50 Gb/s quadrature phase shift keying (QPSK) optical signal verifies its switching functionality.

Paper Details

Date Published: 27 February 2015
PDF: 8 pages
Proc. SPIE 9367, Silicon Photonics X, 93670Z (27 February 2015); doi: 10.1117/12.2083276
Show Author Affiliations
Linjie Zhou, Shanghai Jiao Tong Univ. (China)
Jingya Xie, Shanghai Jiao Tong Univ. (China)
Liangjun Lu, Shanghai Jiao Tong Univ. (China)
Zuxiang Li, Shanghai Jiao Tong Univ. (China)
Jianping Chen, Shanghai Jiao Tong Univ. (China)


Published in SPIE Proceedings Vol. 9367:
Silicon Photonics X
Graham T. Reed; Michael R. Watts, Editor(s)

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