NDLI: Realization of true-time-delay using cascaded long-period fiber gratings: theory and applications to the optical pulse multiplication and temporal encoder/decoder

Content Provider	IEEE Xplore Digital Library
Author	Tae Joong Eom Sun-Jong Kim Tae-Young Kim Chang-Soo Park Un-Chul Paek Byeong Ha Lee
Copyright Year	1983
Abstract	This paper proposes and demonstrates a technique for repetition-rate multiplication of an optical pulse train having an arbitrary period or pattern and the optical temporal encoding/decoding for the optical-code-division multiple-access (O-CDMA) system. The technique exploits the difference in the propagation speeds between the core and copropagating cladding modes of a fiber to obtain true-time-delay between the modes traveling in the core mode and the cladding mode, which can be used to achieve pulse multiplication. For the coupling to the cladding mode, long-period fiber gratings (LPGs) were used. A series of cascaded LPGs imprinted in a fiber with a specific separation has been employed to obtain a specific rate of pulse multiplication with a single input pulse. Second, by controlling the separations among the gratings, the temporal encoder/decoder for O-CDMA could be implemented. The principle and the applications of the proposed device are investigated in detail. The effect of the birefringence of fiber and fiber gratings on the system performance in the time and spectral domains is presented. The sensitivity of the cladding modes in a conventional fiber to the perturbations at the cladding has been overcome by replacing the conventional fiber with inner-cladding fiber. The properties and the benefits of using the inner-cladding mode are investigated.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	597
Ending Page	608
Page Count	12
File Size	932993
File Format	PDF
ISSN	07338724
Volume Number	23
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fiber theory Fiber gratings Optical pulses Decoding Optical fiber devices Optical sensors Encoding Optical propagation Birefringence System performance optical fiber devices cascaded gratings dispersion-compensating fiber (DCF) fiber gratings long-period fiber gratings (LPGs) optical-code-division multiple access (O-CDMA) optical fiber communications
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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