Fully reconfigurable optical add/drop multiplexing subsystem on a chip

Louay A. Eldada; Junichiro Fujita; Antonije M. Radojevic; Reinald Gerhardt; Deepti Pant; Fang Wang; Chuck C. Xu

doi:10.1117/12.529567

30 April 2004 Fully reconfigurable optical add/drop multiplexing subsystem on a chip

Louay A. Eldada, Junichiro Fujita, Antonije M. Radojevic, Reinald Gerhardt, Deepti Pant, Fang Wang, Chuck C. Xu

Proceedings Volume 5279, Optical Fibers and Passive Components; (2004) https://doi.org/10.1117/12.529567
Event: Asia-Pacific Optical and Wireless Communications, 2003, Wuhan, China

Abstract

We propose a single-chip-based module that provides the entire switching/monitoring/equalizing/shuffling functionality needed in 8-channel fully reconfigurable optical add/drop multiplexers. This subsystem on a chip includes an array of switches for adding/dropping individual channels, optical power taps and integrated photodetectors for power monitoring, variable optical attenuators for channel power equalization, and optical cross-connects for channel shuffling at the add and drop ports for full wavelength agility. The chip is based on a polymer-on-silicon platform that allows hybrid integration of passive and active elements. Waveguiding circuitry is built in an optical polymer, and it includes thermo-optic switches, variable optical attenuators, and power taps. Out-of-plane coupling mirrors are formed by ablation of 45° slopes in the polymer waveguides with an Excimer laser, followed by metalization. A self-aligning flipchip process is used to mount photodetector arrays on top of mirrors fabricated in tap waveguides for power monitoring. The worst-case fiber-to-fiber insertion loss for the proposed module, between 1528 and 1610 nm wavelength, is 1.2 dB from Input to Output (Express), including 4% tapped power, and 1.2 dB from Input to Drop and from Add to Output (4.1 dB with 8×8 shuffle cross-connects). The polarization dependent loss for any path is under 0.2 dB, and the polarization mode dispersion is under 0.05 ps. The channel-to-channel crosstalk is 50 dB, the switch extinction is 45 dB, and the return loss is 50 dB.

Citation Download Citation

Louay A. Eldada, Junichiro Fujita, Antonije M. Radojevic, Reinald Gerhardt, Deepti Pant, Fang Wang, and Chuck C. Xu "Fully reconfigurable optical add/drop multiplexing subsystem on a chip", Proc. SPIE 5279, Optical Fibers and Passive Components, (30 April 2004); https://doi.org/10.1117/12.529567

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