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Optical temporal encoding/decoding of short pulses using cascaded long-period fiber gratings

Sun-Jong Kim, Tae-Jung Eom, Byeong Ha Lee, and Chang-Soo Park

Open Access Open Access

Abstract

A novel, optical temporal encoding/decoding method is proposed and demonstrated. This can be accomplished by passing a short optical pulse through cascaded long-period fiber gratings. It has the advantages of constructing ultrafast codes and developing resistance to interferometric perturbations among the coded pulses. To verify the feasibility as a code generator, two types of codes are generated and compared with the predicted code patterns. In addition, to show an application for an optical code-division-multiplexing system, decoding performances with matched and unmatched decoders are compared.

©2003 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Schematic diagram of a temporal encoder using cascaded LPGs. Inset figures are the measured near-field patterns of the core mode and the cladding mode.

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Fig. 2.
Fig. 2. The configurations and temporal responses of cascaded LPGs for two codes: C1 and C2.; (a) Structure of cascaded LPGs with C1; (b) Predicted response of cascaded LPGs with C1; (c) Measured response of cascaded LPGs with C1; (d) Structure of cascaded LPGs with C2; (e) Predicted response of cascaded LPGs with C2 (f) Measured response of cascaded LPGs with C2

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Fig. 3.
Fig. 3. Transmission spectra of two cascaded LPGs with (a) C1 (b) C2. Inset figures are the predicted spectra.

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Fig. 4.
Fig. 4. Experimental set-up. The first LPGs encode an input short pulse into C1, which is decoded by two cascaded LPGs with C1 (autocorrelation) and C2 (cross-correlation). EDFA is an erbium-doped fiber amplifier.

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Fig. 5.
Fig. 5. Decoded signals obtained with (a) the matched decoder; C1*C1 (b) the unmatched decoder; C1*C2. Dotted line: predicted, solid line: measured. Inset figures are the predicted pulse trains measured after the decoder, but before the autocorrelator.

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Equations (2)

Equations on this page are rendered with MathJax. Learn more.

( β co − β cl ) = 2 π Λ
Δ T = L c Δ m eff
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