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Multi-wavelength tunable filer based on polarization maintaining chirped fiber grating

A technology of chirped fiber grating and tuned filter, which is applied in the direction of polarized fiber, grating fiber, cladding fiber, etc., can solve the problems of complex manufacturing process of dual-core fiber filter, low filter extinction ratio, etc., and achieve higher wavelength range, effects that increase controllability

Inactive Publication Date: 2016-06-15
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manufacturing process of the dual-core fiber-optic filter is complicated, and the extinction ratio of the filter is very low

Method used

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  • Multi-wavelength tunable filer based on polarization maintaining chirped fiber grating
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  • Multi-wavelength tunable filer based on polarization maintaining chirped fiber grating

Examples

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Embodiment 1

[0028] A multi-wavelength tunable filter based on a polarization-maintaining chirped fiber grating, such as figure 1 As shown, the multi-wavelength tunable filter is formed by writing a chirped fiber grating 15 on the polarization maintaining fiber 11 and introducing a phase shift 16 to the chirped phase-shifting fiber grating 15 . The polarization maintaining optical fiber has a stress axis X12, a stress axis Y13 and a fiber core 14. Under the action of the stress axis X13 and the stress axis Y14, the refractive index of the fiber core 14 on the X axis and the Y axis is different, forming birefringence, so that the polarization maintaining The frequency spectrum of the chirped fiber grating 15 on the polarization fiber 11 has two mutually symmetrical polarization transmission bands. The transmission spectrum of a polarization-maintaining chirped fiber grating is as follows figure 2As shown, the polarization transmission band 21 on the left corresponds to the frequency spect...

Embodiment 2

[0035] A multi-wavelength tunable filter based on a polarization-maintaining chirped fiber grating, such as figure 1 As shown, the multi-wavelength tunable filter is formed by writing a chirped fiber grating 15 on the polarization maintaining fiber 11 and introducing a phase shift 16 to the chirped phase-shifting fiber grating 15 . The polarization maintaining optical fiber has a stress axis X12, a stress axis Y13 and a fiber core 14. Under the action of the stress axis X13 and the stress axis Y14, the refractive index of the fiber core 14 on the X axis and the Y axis is different, forming birefringence, so that the polarization maintaining The frequency spectrum of the chirped fiber grating 15 on the polarization fiber 11 has two mutually symmetrical polarization transmission bands. The transmission spectrum of a polarization-maintaining chirped fiber grating is as follows figure 2 As shown, the polarization transmission band 21 on the left corresponds to the frequency spec...

Embodiment 3

[0042] A multi-wavelength tunable filter based on a polarization-maintaining chirped fiber grating, such as figure 1 As shown, the multi-wavelength tunable filter is formed by writing a chirped fiber grating 15 on the polarization maintaining fiber 11 and introducing a phase shift 16 to the chirped phase-shifting fiber grating 15 . The polarization maintaining optical fiber has a stress axis X12, a stress axis Y13 and a fiber core 14. Under the action of the stress axis X13 and the stress axis Y14, the refractive index of the fiber core 14 on the X axis and the Y axis is different, forming birefringence, so that the polarization maintaining The frequency spectrum of the chirped fiber grating 15 on the polarization fiber 11 has two mutually symmetrical polarization transmission bands. The transmission spectrum of a polarization-maintaining chirped fiber grating is as follows figure 2 As shown, the polarization transmission band 21 on the left corresponds to the frequency spec...

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Abstract

The invention relates to a multi-wavelength filter based on a polarization-maintaining fiber grating, which belongs to the fields of optical fiber communication and instrumentation. A chirped fiber grating (15) is written on a polarization-maintaining fiber (11), and a phase shift (16) is introduced into the chirped fiber grating. Under the action of the stress axis X (12) and the stress axis Y (13) of the polarization-maintaining fiber, the refractive index of the fiber core (14) on the X-axis and the Y-axis is different, forming birefringence, from the polarization-maintaining chirped fiber grating ( The spectrum of 15) has two mutually symmetrical polarization transmission peaks (21) and (22), and the bandwidth of each polarization transmission peak is consistent with the bandwidth of a chirped fiber grating on an ordinary optical fiber. When a phase shift (16) is introduced into the chirped fiber grating (15), corresponding extremely narrow narrow The position of the slit in the bandwidth range can be changed by changing the position of the phase shift introduced, and the transmission depth of the slit can be changed by changing the phase shift amount θ introduced by the phase shift, and the filter wavelength of the slit can also be finely adjusted at the same time, changing The number m of phase shifts can be introduced to change the filtering number of the filter.

Description

technical field [0001] The invention relates to the fields of optical fiber communication and instrumentation, in particular to a multi-wavelength tunable filter based on a polarization-maintaining chirped fiber grating. Background technique [0002] With the development of communication technology, communication services will turn to broadband services represented by high-speed IP data and multimedia, which put forward higher and higher requirements for the bandwidth and capacity of optical communication networks, and Dense Wavelength Division Multiplexing (DWDM) technology The mature application of the fiber optic communication system has greatly improved the capacity. With the increase in the number of optical channels in DWDM systems, various optical multi-wavelength filter technologies have become a research hotspot in the field of optical fiber communication. [0003] In recent years, people have proposed many optical multi-wavelength filter technologies, mainly inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/024G02B6/293
CPCG02B6/02057G02B6/024G02B6/29317
Inventor 吴良英裴丽王建帅
Owner BEIJING JIAOTONG UNIV
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