Optical isolator using photonic crystal

Details Optical isolator using photonic crystal Optical isolator using photonic crystal

2007-01-16

2007-01-16

Palmer, Phan (Department: 2874)

Optical waveguides

With optical coupler

Particular coupling structure

C385S011000, C385S024000, C385S129000, C359S484010

Reexamination Certificate

active

11316842

ABSTRACT:
An optical isolator using a photonic crystal. The optical isolator includes an input portion that in turn includes an input waveguide part and an input waveguide having a taper portion formed in the input waveguide part. An output portion includes an output waveguide part and an output waveguide formed in the output waveguide part continuously with the input waveguide. The output waveguide includes a backward directional optical signal shield surface having an inclination greater than the taper portion with respect to an optical signal transmission center axis. The optical isolator is operable to have an optical signal substantially transmitted in a forward direction from the input portion to the output portion and further operable to substantially not transmit the optical signal in a backward direction from the output portion to the input portion.

REFERENCES:
patent: 6813399 (2004-11-01), Hamada
patent: 6934441 (2005-08-01), Toney
Pottier P et al. “Photonic crystal continuous taper for low-loss direct coupling into 2D photonic crystal channel waveguides and further device functionality”, Optics Communications, North-Holland Publishing Co. Amsterdam, NL, vol. 223, No. 4-6, Aug. 1, 2003, pp. 339-347, XP004443888.
Happ T D et al., “Photonic Crystal Tapers For Ultracompact Mode Conversion”, Optics Letters, OSA, Optical Society Of America, Washington, DC, US, vol. 26, No. 14, Jul. 15, 2001, pp. 1102-1104, XP001103642.

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