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Optics Express

An efficient method of all-optical buffering with ultra-small core photonic crystal fibers

Yingchun Cao, Peixiang Lu, Zhenyu Yang, Wei Chen

Published Aug 26, 2008• 14 citations
Publisher

Abstract

We propose a new method of all-optical buffering with ultra-small core photonic crystal fibers (PCFs) based on stimulated Brillouin scattering. The large refractive index contrast between the near-hollow cladding and the pure-silica core contributes to high nonlinearity of the PCF. Considering the unusual gain spectrum of the ultra-small core PCF, we numerically investigate the influence of these factors to the buffering efficiency. A PCF with a length of 1 meter and a core diameter of 1.06 micrometer is simulated as the storage medium in this paper. It is shown that we can obtain a good buffering efficiency under a very low control power of 2 watt, which promises a significant improvement for the all-optical communication system.

DOI
10.1364/oe.16.014142

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We propose a new method of all-optical buffering with ultra-small core photonic crystal fibers (PCFs) based on stimulated Brillouin scattering. The large refractive index contrast between the near-hollow cladding and the pure-silica core contributes to high nonlinearity of the PCF. Considering the unusual gain spectrum of the ultra-small core PCF, we numerically investigate the influence of these factors to the buffering efficiency. A PCF with a length of 1 meter and a core diameter of 1.06 micrometer is simulated as the storage medium in this paper. It is shown that we can obtain a good buffering efficiency under a very low control power of 2 watt, which promises a significant improvement for the all-optical communication system.
We demonstrate that we realize large-delay slow light based on stimulated Brillouin scattering in a short length of our fabricated small-core photonic crystal fiber (PCF). The cavity effect from the partially reflective splices in the end of the PCF enhances slow-light delay significantly. Our experiments show that large slow-light delay can be easily realized in a very short length of the PCF with a moderate pump power. Up to a one-half pulse-width delay is achieved in only 50 m of PCF in a single pump segment.
Based on stimulated Brillouin scattering (SBS), the slow light effect in photonic crystal fibre (PCF), which is filled with highly nonlinear liquid-carbon disuphide in the core region, is investigated. Maximum allowable pump power for undistorted output pulse, minimum value of pump power required to initiate the SBS effect, Brillouin gain and time-tonic delay experienced by the pulse in the designed liquid-core photonic crystal fibre, are all calculated numerically. We have found that the maximum time-delay up to ∼134.4 ns at 1.064 μm can be obtained using 1 m long liquid-core PCF pumped with only 65.8 mW, which is lower than the value reported in the literature for achieving such a high delay time. The results indicate that liquid-core PCF is capable of generating tunable time-delay that is adjusted by the pump power and structural parameters of the proposed liquid-core PCF.
There is great interest in photonic crystal fibers (PCFs) because of their potential for hosting highly nonlinear material. Already with material of low nonlinearity such as silica for solid core PCFs, the nonlinear properties can be utilized since high intensities of light are guided within the core. To create squeezed states, we plan to exploit the high nonlinearity of resonant Rb vapor filled in the hollow fiber core and to use self-induced transparency (SIT) solitons to avoid resonant loss. High nonlinearity is induced from the self-phase modulation of a detuned 2pi soliton. Photon-phonon interactions, which cause a significant amount of excess noise in solid core fibers, will be highly reduced in our system.