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Multi-channel Dispersion Compensator Based on Interleaved Multi-Phase Shift Chirped Sampling Fiber Bragg Grating and Its Application

A technology of dispersion compensator and sampling optical fiber, which is applied to instruments, light guides, optics, etc., can solve the problems of low reflectivity of gratings, large power loss, inability to manufacture, etc., and achieve the effect of mature technology, easy manufacture and simple structure.

Active Publication Date: 2019-05-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of chirped sampling fiber gratings can perform dispersion compensation for multiple channels in WDM systems at the same time, the problem is that there are a large number of blank segments in each sampling period due to the use of sampling gratings, resulting in the reflectivity of the grating. Not high, resulting in large power loss
Therefore, for a dispersion compensator with an ultra-high channel number T, its corresponding refractive index modulation value Δn 0 too big to make

Method used

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  • Multi-channel Dispersion Compensator Based on Interleaved Multi-Phase Shift Chirped Sampling Fiber Bragg Grating and Its Application
  • Multi-channel Dispersion Compensator Based on Interleaved Multi-Phase Shift Chirped Sampling Fiber Bragg Grating and Its Application
  • Multi-channel Dispersion Compensator Based on Interleaved Multi-Phase Shift Chirped Sampling Fiber Bragg Grating and Its Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The multi-channel dispersion compensator of Embodiment 1 is designed as a dispersion compensator used in a WDM system with a frequency interval of 50 GHz (wavelength interval of 0.4 nm) and a center wavelength of 1550 nm. Bragg grating area 3 adopts interleaved multi-phase shift chirp sampling fiber grating.

[0072] Figure 6 It is a schematic structural diagram of the interleaved multi-phase-shift chirped sampling fiber grating of this embodiment, and from top to bottom are the second, first and third groups of multi-phase-shift chirped sampling fiber gratings respectively. According to the aforementioned reflectance spectrum cascading criterion, the central periods of the three groups of multi-phase-shift chirped sampling fiber gratings are: Λ 1 =522.7nm, Λ 2 =521.9nm, Λ 3 = 521.1 nm. For each group of multi-phase-shift chirped sampling fiber gratings, the difference between the initial phase of the grating in the (k+1)th sampling period and the initial phase of ...

Embodiment 2

[0080] The multi-channel dispersion compensator of this embodiment is designed as a dispersion compensator used in a WDM system with a frequency interval of 100 GHz (wavelength interval of 0.8 nm) and a central wavelength of 1550 nm. The Bragg grating area adopts 5 sets of interleaved multi-phase shift chirped sampling fiber gratings.

[0081] Figure 9 It is a schematic diagram of the structure of interleaved multi-phase-shift chirped sampling fiber gratings, from top to bottom are the fourth, second, first, third, and fifth groups of multi-phase-shift chirped sampling fiber gratings.

[0082] According to the reflection spectrum cascading criterion, the central period of each group of multi-phase-shift chirped sampling fiber gratings is calculated. For each group of multi-phase-shift chirped sampling fiber gratings, the difference between the initial phase of the grating in the (k+1)th sampling period and the initial phase of the grating in the kth sampling period is Acco...

Embodiment 3

[0089] Similar to Example 2, the difference is:

[0090] 1. The number m of interleaved grating groups changed from 5 to 7;

[0091] 2. In order to keep the reflectance of each channel unchanged under the premise of adding channels, the refractive index modulation value Δn 0 Increased to 7×10 -4 ;

[0092] 3. Since the increase in the number of interleaved grating groups will reduce the total length of each group of interleaved gratings when the total length of the grating remains unchanged, in order to ensure that the total amount of chirp of each group of interleaved gratings remains unchanged , that is, the product of the chirp coefficient of each group of interleaved gratings and its total length remains unchanged, and the chirp coefficient is increased to 14.9331nm / m.

[0093] table 3

[0094]

[0095] Figure 12 In the Bragg grating region of this embodiment, the reflection spectrum and delay curve of the interleaved multi-phase-shift chirp-sampled fiber grating ...

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Abstract

The invention provides a multichannel dispersion compensator based on interleaved multi-phase-shift chirp sampling fiber gratings. The multichannel dispersion compensator comprises an input end, a circulator, a Bragg grating area and an output end. The Bragg grating area is formed by m sets of multi-phase-shift chirp sampling fiber gratings through interleaving. All sets of the chirp sampling fiber gratings have the same sampling duty ratio, the sampling period N and the total grating length. The interleaved multi-phase-shift chirp sampling fiber gratings have wider reflection spectrum envelope 3dB bandwidth, better reflection spectrum flatness, more channels and better dispersion compensation effect so as to provide better dispersion compensation effect to more channels in a WDM system.

Description

【Technical field】 [0001] The invention relates to a multi-channel dispersion compensator, which belongs to the field of laser technology. The dispersion compensator is a multi-channel dispersion compensator based on an interleaved multi-phase-shift chirped sampling fiber grating. 【Background technique】 [0002] Since optical signals of different frequencies, different modes, and different polarization modes have different group velocities propagating in the optical fiber, the optical signal will cause pulse broadening after a certain distance in the optical fiber, that is, dispersion. The pulse broadening caused by dispersion will cause overlapping between adjacent pulses, resulting in intersymbol interference and increasing the bit error rate. In order to eliminate intersymbol interference, the pulse interval can be increased, but this will reduce the transmission rate. Therefore, it is necessary to perform dispersion compensation on the optical signal to avoid pulse broad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/293
CPCG02B6/29316
Inventor 李满余永林
Owner HUAZHONG UNIV OF SCI & TECH
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