Optical interferometer

Details Optical interferometer Optical interferometer

2007-08-07

2007-08-07

Connelly-Cushwa, Michelle (Department: 2874)

Optical waveguides

Integrated optical circuit

C385S028000, C385S039000, C356S480000, C359S337500

Reexamination Certificate

active

11217543

ABSTRACT:
One embodiment of an optical interferometer includes a first MMI device coupled to a second MMI device via a waveguide. The first MMI device separates a first signal into a guided portion and a diffused portion. The guided portion is transmitted to the second MMI device through the waveguide. At least part of the diffused portion reflects off a reflector towards the second MMI device and is coupled with the guided portion within either the second MMI device or a part of the waveguide proximal to the second MMI device, forming at least part of a second signal. The difference between the propagation times of the guided portion and the at least part of the diffused portion results in constructive or destructive interference between the two portions, allowing specific channels to be added to or dropped from the first signal.

REFERENCES:
patent: 6771847 (2004-08-01), Mukai
Xioa Y, et al. “An MMI-Based Demultiplexer with Reduced Cross-talk” Optics Communications, North-Holland Publishing Co. Amsterdam, NL, vol. 247, No. 4-6, Mar. 15, 2005, pp. 335-339, XP004793147, ISSN: 0030-4018.
Soldano L. B. et al. “Optical Multi-Mode Interference Devices Based on Self-Imaging: Principles and Applications” Journal of Lightwave Technology, IEEE, Service Center, New York, NY, US, vol. 13, No. 4, Apr. 1, 1995, pp. 615-627, XP000513578 ISSN: 0733-8724.
Paiam, M. R. et al. “Compact Planar 980/1550-NM Wavelength Multi/Demultiplexer Based on Multimode Interference” IEEE Photonics Technology Letters, IEEE Service Center, Piscataway, NJ, US, vol. 7, No. 10, Oct. 1, 1995, pp. 1180-1182, XP000537230, ISSN: 1041-1135.
EP Search Report, Application No. 05108569.4, Dated Jun. 8, 2006.

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