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Published October 14, 1991 | public
Journal Article Open

Ultracompact, low-loss directional couplers on InP based on self-imaging by multimode interference


We report extremely compact (494-µm-long 3 dB splitters, including input/output bends), polarization-insensitive, zero-gap directional couplers on InP with a highly multimode interference region that are based on the self-imaging effect. We measured cross-state extinctions better than 28 dB and on-chip insertion losses of 0.5 dB/coupler plus 1 dB/cm guide propagation loss at 1523 nm wavelength.

Additional Information

Copyright © 1991 American Institute of Physics (Received 12 June 1991; accepted 12 August 1991) We acknowledge useful conversations and technical assistance from L. M. Schiavone. This work was supported in part under the auspices of the U.S. Department of Energy under contract No. W-7405-ENG-48.


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