Multimode Fibered Photodetectors for High-Power High-Speed Applications Beyond 10 Gb/s (2007)

Roy Howard, Xinde Wang, Abhay Joshi, Don Becker, Shubhashish Datta & Christoph Wree
Discovery Semiconductors, Inc.
119 Silvia Street
Ewing, New Jersey, 08628, USA


We report the development of top illuminated InGaAs photodetectors pigtailed to 50 µm core multimode (MM) fibers. These PIN diodes, in conjunction with low dispersion graded index MM fibers, allow for low cost and rugged solutions for high speed digital and analog applications. Our PIN diodes have previously demonstrated high optical power handling capability at large signal bandwidths. Coupled with large collection efficiency of MM fibers, these devices are suitable for a diverse range of systems, including avionics, ultra-fast Ethernet, radio over fiber, optical backplanes and free space laser links. The effect of the MM fiber’s transfer function and fiber misalignment on the photodetector response is addressed. The spatial and temporal filtering effects of the MM fiber and the photodiode are explored experimentally through a 40 Gb/s link. Enhancement in photodiode linearity due to MM fiber is also reported.

* Paper presented at Defense and Security Symposium, Orlando, Florida, USA, 2007, Proc. SPIE Vol. 6572.

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