Photonic band gap device and method using a periodicity defect r

Details Photonic band gap device and method using a periodicity defect r Photonic band gap device and method using a periodicity defect r

1997-10-24

1999-05-25

Nelms, David

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359250, 359259, 359260, 359264, 359279, 359331, 359586, 359587, 359588, G02B 110

Patent

active

059074272

ABSTRACT:
A photonic band gap structure device and method for delaying photonic signals of a predetermined frequency and a predetermined bandwidth by a predetermined delay is provided. A Fabry-Perot delay line device has several regions of periodically alternating refractive material layers which exhibit a series of photonic band gaps and a periodicity defect region, interposed between the regions of periodically alternating refractive material layers. The Fabry-Perot delay line device imparts a predetermined delay to photonic signals that pass therethrough. The introduction of the periodicity defect region into this photonic band gap structure creates a sharp transmission resonance within the corresponding photonic band gap of the structure and causes at least an order of magnitude improvement in photonic signal delay for a band-edge delay line device of similar size. Variable photonic delays to multiple photonic signals are also generated by this Fabry-Perot delay line device. In addition, a photonic signal delay device based on an optical fiber grating structure is provided.

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Scalora et al., "Ultrashort pulse propagation at the photonic band edge: Large tunable group delay with minimal distortion and loss", Rapid Communications, vol. 54, No. 2, pp. R1078-R1081, Aug. 1996.

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