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Iranian Conference on Electrical Engineering

Tunable group delay in a SOI waveguide based on stimulated Raman scattering

Majid Ferdosian, Hassan Kaatuzian

Published Jan 1, 2011• 0 citations
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Abstract

We analytically demonstrate the slow down factor enhancement of slow light induced by stimulated Raman scattering in a silicon-on insulator waveguide with a p-i-n Structure. An analytical model is derived for group delay simulation by taking into account of propagation loss and free carrier absorption. It is shown that applying a variable reverse bias voltage to the waveguide decreases the FCA and thus the maximum group delay can be enhanced. Tunable delay time is achievable through applying different bias voltages.

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We analytically demonstrate the slow down factor enhancement of slow light induced by stimulated Raman scattering in a silicon-on insulator waveguide with a p-i-n Structure. An analytical model is derived for group delay simulation by taking into account of propagation loss and free carrier absorption. It is shown that applying a variable reverse bias voltage to the waveguide decreases the FCA and thus the maximum group delay can be enhanced. Tunable delay time is achievable through applying different bias voltages.
This paper presents a new model for an absorptive-dispersive optical bit memory using stimulated Raman scattering slow-light (SRS). The structure of our model is developed in a low loss silicon-on-insulator (SOI) waveguide based on Stimulated Raman Scattering (SRS). Waveguide has two parts, Raman cell and feedback pass. This model functions as a memory bit and can store an optical pulse by generating a pulse train in the output. Also by using a p-i-n diode structure in Raman cell, the delay time between OB output pulses can be tuned through changing the bias voltage.
We demonstrate optically tunable delays in a silicon-on-insulator planar waveguide based on slow light induced by stimulated Raman scattering (SRS). Inside an 8-mm-long nanoscale waveguide, we produce a group-index change of 0.15 and generate controllable delays as large as 4 ps for signal pulses as short as 3 ps. The scheme can be implemented at bandwidths exceeding 100 GHz for wavelengths spanning the entire low-loss fiber-optics communications window and thus represents an important step in the development of chip-scale photonics devices that process light with light.
We experimentally demonstrate slow-down of light by a factor of three in a 100 microm long semiconductor waveguide at room temperature and at a record-high frequency of 16.7 GHz. It is shown that the group velocity can be controlled all-optically as well as through an applied bias voltage. A semi-analytical model based on the effect of coherent population oscillations and taking into account propagation effects is derived and is shown to well account for the experimental results. It is shown that the carrier lifetime limits the maximum achievable delay. Based on the general model we analyze fundamental limitations in the application of light slowdown due to coherent population oscillations.
In this paper we describe a new modulation scheme using stimulated Raman scattering in conjunction with a reverse biased p-i-n diode embedded in a silicon waveguide. We show optical modulation of a weak probe beam by modulating the reverse bias voltage of the silicon waveguide excited by a strong pump beam. The probe beam modulation is due to the two-photon absorption-induced carrier density modulation in the waveguide. By tuning the probe wavelength to the Stokes wavelength, we demonstrate for the first time a lossless optical modulator in silicon with modulation speeds up to 80-MHz.