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Optical fiber of stimulated Brillouin scattering effect enhancement type

A technology of stimulated Brillouin and scattering effects, applied in cladding fibers, multi-layer core/cladding fibers, optics, etc., and can solve problems such as insufficient performance

Active Publication Date: 2015-08-26
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The patent document with the application number CN 101174002 B discloses a nonlinear optical fiber. By reducing the effective area of ​​the optical field in the optical fiber, the nonlinear constant in the optical fiber is increased, so that self-phase modulation, cross-phase modulation and four-wave mixing and other nonlinear effects are enhanced; but for the Brillouin scattering benefit spectrum, the optical fiber disclosed in this patent document cannot meet the performance of the aforementioned high-Q parameter active optical filter application

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  • Optical fiber of stimulated Brillouin scattering effect enhancement type
  • Optical fiber of stimulated Brillouin scattering effect enhancement type
  • Optical fiber of stimulated Brillouin scattering effect enhancement type

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Experimental program
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Embodiment 1

[0034] The optical fiber provided by embodiment 1 comprises a core and a cladding surrounding the core;

[0035] Among them, the core radius a is 3 μm, the core doping Ge concentration is 1.646%, and the core refractive index is 1.4616; the cladding doping F concentration is 0.335%, and the cladding refractive index is 1.4551;

[0036] The doping concentration and core radius of the above-mentioned optical fiber make only one form of optical field exist in the optical fiber, and the optical field parameter a 2 Δn is 0.036μm 2 ; corresponding to a unique β acoust ; among them, β acoust is the component of the acoustic wave vector along the axis of the optical fiber;

[0037] For the optical fiber provided in Example 1, due to the fiber doping effect, the acoustic velocity difference between the core and the cladding is ΔV l is 16.6m / s; therefore a 2 ΔV l =149.6μm 2 m / s, compared with ordinary single-mode fiber, a 2 ΔV l An order of magnitude smaller, it is a single acous...

Embodiment 14

[0044] The optical fiber provided by Embodiment 14 includes a core and a cladding surrounding the core;

[0045] Among them, the core radius a is 2 μm, the core doping Ge concentration is 3.704%, and the refractive index is 1.4634; the cladding layer doping F concentration is 0.748%, and the refractive index is 1.4544; the optical field is a single-mode characteristic, and the parameter a 2 Δn is 0.0364μm 2 , corresponding to a unique β acoust ; The fiber doping effect makes the acoustic velocity difference between the core and the cladding ΔV l is 38.4m / s, get a 2 ΔV l =153.6μm 2 m / s;

[0046] Compared with the optical fiber provided in Example 1, the acoustic velocity difference ΔV between the core and the cladding of the optical fiber provided in Example 14 l Raise about 3 times than the optical fiber of embodiment 1, but the fiber core radius reduces to 2 / 3 of the fiber core radius in embodiment 1; The acoustic field normalization parameter a of the optical fiber tha...

Embodiment 15

[0049] The optical fiber provided by Embodiment 15 includes a core and a cladding surrounding the core;

[0050] Among them, the core radius a is 1.5 μm, the core doping Ge concentration is 6.584%, and the refractive index is 1.4676; the cladding doping F concentration is 1.330%, and the refractive index is 1.4516; the parameter a 2 Δn is 0.036μm 2 , corresponding to the only fiber doping effect that makes the parameter a between the acoustic velocity difference of the core cladding and the core radius 2 ΔV l =153.7μm 2 m / s;

[0051] Compared with embodiment 1 and embodiment 14, the optical fiber provided by embodiment 15 has a reduced core radius, while the sound velocity difference between the core and the cladding further increases; the acoustic velocity difference of the optical fiber provided by embodiment 15 is about It is 7 times of that in Example 1, and the sound field normalization parameter a 2 ΔV l Basically unchanged, so the sound field is also a single-mode...

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Abstract

The invention discloses an optical fiber of a stimulated Brillouin scattering effect enhancement type, and the optical fiber comprises a fiber core and a wrapping layer surrounding the fiber core. The radius a of the fiber core is from 1 [mu]m to 7 [mu]m, and the fiber core is doped with one of GeO2, P2O, and Al2O3. The wrapping layer is doped with a material F. The relation between the refractive index difference delta n between the fiber core and the wrapping layer and the radius a of the fiber meets the conditions: a*a*delta n is greater than zero and not greater than 0120 [mu]m[2]. The relation between the sound speed difference delta V1 between the fiber core and the wrapping layer and the radius a of the fiber meets the conditions: a*a*delta V1 is greater than zero and not greater than 225 [mu]m[2]*m / s, so as to excite and generate single optical mode and single sound mode constraint stably in the optical fiber at the same time. The fiber core and the wrapping layer are respectively doped with different materials, thereby obtaining the common excitation of an acousto-optic field. A single brillouin gain peak is formed in the optical fiber through coupling. The position of the gain peak of a gain spectrum of the optical fiber is higher in gain coefficient, and the full width at half maximum of a brillouin gain spectrum is narrower and is about 10 MHz. Moreover, the optical fiber also can improve an absolute value of a chromatic dispersion parameter while enhancing the stimulated Brillouin scattering effect, and effectively inhibits an four-wave mixing effect nearby a normally-used working band window 1.55 [mu]m.

Description

technical field [0001] The invention belongs to the field of optical fiber technology, and more specifically relates to a stimulated Brillouin scattering effect enhanced optical fiber. Background technique [0002] The gain spectrum bandwidth of stimulated Brillouin scattering in optical fiber is very narrow (about 10MHz). Using this narrow bandwidth gain spectrum characteristic, it can be used to construct an active optical filter with high Q parameters to extract specific wavelength components of the measured signal , has a wide range of applications in ultra-high resolution spectral analysis, microwave photon filtering and other fields. When applied in these fields, the filter should have a narrow passband bandwidth, high isolation and a single-peak transmission curve; therefore, the optical fiber used to form an active optical filter with a high Q parameter should have a Brillouin The narrow bandwidth of the gain spectrum, high gain factor and single gain peak are featu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/036G02B6/02
CPCG02B6/02028G02B6/02242G02B6/03627
Inventor 柯昌剑郭臻潘登刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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