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Coupling Loss From Free Space to Large Mode Area Photonic Crystal Fibers

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2 Author(s)
Niru K. Nahar ; Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH, USA ; Roberto G. Rojas

Simulated and measured results are presented for the coupling loss from free space into a large mode area (LMA) photonic crystal fiber. The total measured loss (using bulk optics) for a signal (¿ = 1.55 ¿m) going in and out of a 1-m-long fiber was -2.15 dB. It was also observed that the fiber is not that sensitive to lateral misalignment compared that to the conventional single-mode fiber. Due to the low loss, this type of fiber could be used to create long delays in optical true-time-delay engines based on the White cell concept and others. The above loss can be further reduced by using field lenses or lensed LMA.

Published in:

Journal of Lightwave Technology  (Volume:26 ,  Issue: 22 )