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International Conference on Optical Communications and Networks (ICOCN)

Slow/fast light in erbium-doped fibers based on cross gain modulation

Li Zhan, Kai Qian, Liang Zhang, Fangying Tao, Shouyu Luo, Yuxing Xia

Published Jan 1, 2011• 1 citation
Publisher

Abstract

We proposed and demonstrated the propagation of slow/fast light in erbium-doped fiber through gain cross modulation. We observed the ultraslow light with a group velocity of 6.1×10-3 c and the superluminal propagation with a negative group velocity of -5.1 ×10-4c. (2 pages)
DOI
10.1049/cp.2011.1324

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We propose and experimentally demonstrate the propagation of slow/fast light in an erbium-doped fiber (EDF) using mutually modulated cross-gain modulation. The group velocity of the light signal can be manipulated by the effect of gain cross-saturation modulation by a saturating light at an arbitrary wavelength in the gain bandwidth of the EDF. The ultraslow propagation with a small group velocity of 5.6 × 10⁻³c (c is the light speed in free space) and superluminal propagation with a negative group velocity of -1.1 × 10⁻³c has been observed under different modulation phases.
Recently, researches about the controllable group velocity of light propagation had made many progresses. And several experiments had demonstrated the signal evolution of slow and fast light. In this letter, the authors described a simple experiment for the tracing of light signals in an erbium-doped optical fiber at the optical communication wavelength firstly. We have, directly, observed the evolution of slow and fast signals with different waveforms that travel in an erbium-doped fiber amplifier. Through tracing the signal evolution, when slow light (Vg<;<;c) or fast light (Vg<;0) was got in it, we concluded that asymmetrical absorption and amplification on the periodical signal could account for the generation of slow and fast light in an erbium-doped fiber amplifier easily.
We report the group velocity control of light in optical fiber by gain-imbedded unbalanced fiber Mach–Zehnder interferometer. Slow and fast light effects were observed at the frequencies near the minimum of the transmission spectrum. Controllable group velocity between 0.719 c to 0.620 c ( c is the light speed in a vacuum) was obtained via the cross-intensity modulation effect, by changing the gain index in the long arm. With the power compensation provided by the introduced Erbium doped fiber, this proposal offers a simple and operable solution to realize lossless slow and fast light propagation in optical fiber.
We observe both extremely slow and superluminal pulse propagation speeds at room temperature in an erbium-doped fiber (EDF). A signal at 1550 nm is sent through an erbium-doped fiber with varying powers of a 980 nm pump. The degree of signal delay or advancement is found to depend significantly on the pump intensity. We observe a maximum fractional advancement of 0.124 and a maximum fractional delay of 0.089. The effect is demonstrated both for a sinusoidally modulated signal and for Gaussian pulses. The ability to control the sign and magnitude of the pulse velocity could have important implications for applications in photonics.