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Japanese Journal of Applied Physics

Distributed Feedback Laser in External Light Injection Scheme for Tunable Slow Light

Chun-Ting Lin, Peng‐Chun Peng, Po-Tsung Shih, Sien Chi

Published Jun 1, 2008• 2 citations
Publisher

Abstract

This investigation experimentally demonstrates a commercial distributed feedback (DFB) laser in an external light injection scheme for tunable slow light. The effect of the polarization of the probe signal on tunable optical delay is studied. Tunable optical delays of up to 30 ps for 10 GHz sinusoidal signals with optimal polarization are achieved. We also study the relationship between optical delay and input optical modulation index.

DOI
10.1143/jjap.47.4600

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This investigation experimentally demonstrates a commercial distributed feedback (DFB) laser in an external light injection scheme for tunable slow light. The effect of the polarization of the probe signal on tunable optical delay is studied. Tunable optical delays of up to 30 ps for 10 GHz sinusoidal signals with optimal polarization are achieved. We also study the relationship between optical delay and input optical modulation index.
Tunable delays in semiconductor optical amplifiers are achieved via four wave mixing between a strong pump beam and a modulated probe beam. The delay of the probe beam can be controlled both electrically, by changing the SOA bias, and optically, by varying the pump power or the pump-probe detuning. For sinusoidal modulated signal at 0.5 GHz, a tunable delay of 1.6 ns is achieved. This corresponds to a RF phase change of 1.6 pi. For 1.3 ns optical pulses propagating through the SOA a delay of 0.59 ns is achieved corresponding to a delay-bandwidth product exceeding 0.45. For both the cases, slow light and superluminal light are observed as the pump-probe detuning is varied.
Abstract Tunable slow light systems have gained much interests recently due to their efficient control of strong light–matter interactions as well as their huge potential for realizing tunable device applications. Here, a dynamically tunable polarization independent slow light system is experimentally demonstrated via electromagnetically induced transparency (EIT) in a terahertz (THz) metasurface constituted by plus and dimer-shaped resonators. Optical pump-power dependent THz transmissions through the metasurface samples are studied using the optical pump THz probe technique. Under various photoexcitations, the EIT spectra undergo significant modulations in terms of its resonance line shapes (amplitude and intensity contrast) leading to dynamic tailoring of the slow light characteristics. Group delay and delay bandwidth product values are modulated from 0.915 ps to 0.42 ps and 0.059 to 0.025 as the pump fluence increases from 0 to 62.5 nJ cm−2. This results in tunable slow THz light with group velocities ranging from 2.18 × 105 m s−1 to 4.76 × 105 m s−1, almost 54% change in group velocity. The observed tuning is attributed to the photo-induced modifications of the optoelectronic properties of the substrate layer. The demonstrated slow light scheme can provide opportunities for realizing dynamically tunable slow light devices, delay lines, and other ultrafast devices for THz domain.
We report the experimental demonstration of tunable ultraslow light using a 1.55 um vertical-cavity surface-emitting laser (VCSEL) at room temperature. By varying the bias current around lasing threshold, we achieve tunable delay of an intensity modulated signal input. Delays up to 100 ps are measured for a broadband signal with modulation frequency of 2.8 GHz. With a VCSEL design optimized for amplification and leveraging the scalability of VCSEL arrays, delays of multiple modulation periods are feasible.