Fast-light-tunable device based on stimulated Brillouin scattering

Abstract

The invention discloses a fast-light-tunable device based on stimulated Brillouin scattering. The fast-light-tunable device comprises an optical pulse light source module, an optical amplifier, an optical fiber circulator, an attenuation-tunable module and an optical fiber coupler, and is characterized in that the attenuation-tunable module, the optical fiber circulator, the optical fiber coupler and a section of common single-mode optical fiber form a one-way ring resonant cavity, and an optical pulse enters the resonant cavity after being amplified by the optical amplifier. When the power of the optical pulse is larger than a threshold value, a stimulated Brillouin laser is generated in the resonant cavity, the output time of an optical signal is earlier than the input time of pulsed light at the moment, and therefore the transmission speed of signal light is improved. Under the condition that the fast light is achieved, the timing advance value of the optical signal can be controlled by controlling the attenuation-tunable module, and then the propagation speed of the light can be tuned. The fast-light-tunable device can work under any wavelength and can be well compatible with a modern optical communication system, and the lead time value of the fast light can be continuously adjusted.

Description

technical field [0001] The invention relates to the optical signal transmission speed control technology, and constructs a fast optical tunable device based on the stimulated Brillouin scattering effect (SBS). Background technique [0002] Due to the incomparable advantages of other communication methods in large-capacity and long-distance communication, optical fiber communication has developed rapidly in the past three decades. However, some key technologies in the current optical fiber communication system are still realized by converting optical signals into electrical signals, such as information storage, routing, and switching on. Limited by the conversion limit rate, the traditional photoelectric conversion can no longer meet the development needs of communication capacity. The inevitable direction of the development of the next generation communication system is all-optical communication. One of the key technologies of all-optical communication is to use optical mea...

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Problems solved by technology

[0003] In the existing research, there are many dielectric materials that can realize optical delay: one is to realize optical delay through semiconductor optical amplifier (Chinese patent: 201010120879), this technical means is easy to use with Other semiconductor optoelectronic device chips are integrated, but they can only work in a specific wavelength range; the second is slow light on photonic crystal waveguides (Chinese patents: 201010283337, 201010251511). and other advantages, but the general processing technology is complicated, and the coupling with the optical fiber also causes the instability of the system

[0004]The technology of directly controlling the speed of light in the optical fiber can be better integrated in the optical communication network. The related technologies mainly include the following categories: First, the use of coherent population Oscillation (CPO) technology produces fast and slow light in erbium-doped fibers (see G. M. Gehring, et al., Science 312, 895 (2006) for details), by changing the erbium-doped The pump power of optical fiber is used to realize the tuning of fast and slow light, but the response bandwidth is only on the order of kHz, which cannot meet the requirements of high-speed optical communication applications with a transmission rate of 40Gb / s or even higher; the second is to use stimulated Raman scattering (SRS) to achieve slow Light (see J. E. Sharping, et al., Opt. Express 13, 6092 (2005) for details), using fiber Raman amplifiers to achieve delays to femtosecond pulses, but The absolute delay of slow light is only on the order of 100fs; the third is to realize slow light based on optical parametric amplification technology (OPA) (see D. Dahan, et al., Opt. Express 13, 6234 (2005)), through the nonlinear interaction between strong pump light and signal light, the speed of light is slowed down, and at the same time, it can perform wavelength conversion and has a large response bandwidth (~200nm), and can respond to 10Gb / s The absolute delay of slow light can reach the order of 10 ps for optical communication data signals at an order of magnitude rate; the fourth is to use stimulated Brillouin scattering to realize fast and slow light (see Y. Okawachi, et al. , Phys. Rev. Lett.94, 153902 (2005)), this technology slows down or speeds up the speed of light through the Brillouin nonlinear interaction between pump light and signal light, and can work in any Wavelength, relative delay and advance are relatively large, but the optical structure is relatively complex, generally only by adjusting the pump light power to achieve the delay or advance

[0005] So far, most of the research work has focused on the slowing down of the speed of light and its tunable control. big progress

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