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Dispersion compensation module

A technology of negative dispersion and positive dispersion, applied in the field of dispersion compensation module design, can solve problems such as complexity, mode noise deterioration of signal-to-noise ratio, and addition of mode converters

Inactive Publication Date: 2004-04-28
FITEL美国公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The downside is complexity, i.e. adding a mode converter, which potentially increases losses
Another complication is that fiber is multimode, meaning that mode noise due to interference between modes deteriorates the signal-to-noise ratio

Method used

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Embodiment Construction

[0031] the term

[0032] The following definitions are consistent with common usage in the prior art.

[0033] Chromatic Dispersion - Electromagnetic waves of different wavelengths, with different group velocity values ​​- In single-mode fiber, if not compensated, a linear effect (its amplitude is linearly dependent on power) that constitutes the main limitation on the channel information capacity (just bit rate, as does the pulse spread due to the different rates of the pulse-containing wavelengths).

[0034]Evaluation index (Figure Of Merit (FOM)) - at a specific wavelength, the value of fiber dispersion divided by the ratio of fiber attenuation.

[0035] Non-Zero Dispersion Shifted Fiber (NZDF) - at the expected operating wavelength of the fiber λ op A fiber with a certain amount of dispersion (typically greater than 0.8 ps / nm·km). Such fibers are disclosed in US Patent No. 5,878,182 and are particularly advantageous in WDM systems.

[0036] Refractive Index Profile -...

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PUM

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Abstract

Disclosed is a dispersion-compensating (DC) module [740] comprising a first length of DC optical fiber [10] in tandem with a second length of a standard singlemode optical fiber. The DC fiber is fabricated from silica glass and has a refractive index profile that includes a core region [51] surrounded by a cladding region [52] having a nominal refractive index n4. The core region includes a central core [511] having a nominal refractive index n1, a 'trench' [512] surrounding the central core having a nominal refractive index n2, and a 'ridge' [513] surrounding the trench having a nominal refractive index n3. A range of refractive index profiles has been found that provides relative dispersion slopes (RDS) that are greater than 0.012 nm-1 and figures of merit that are greater than 200 ps / (nm.dB).

Description

technical field [0001] The present invention mainly relates to the improvement of the optical fiber, especially relates to the design of the dispersion-compensating module. Background technique [0002] Various mechanisms limit the bandwidth of optical fibers. In multimode optical fibers, for example, modal dispersion exists, where light pulses entering one end of the fiber are dispersed as they emerge from the other end of the fiber. That's because multimode fibers support hundreds of different modes (or paths, when photons are considered particles rather than waves) as light travels along the length of the fiber. Unfortunately, successive pulses of certain modes arrive at the far end of the fiber almost simultaneously and interfere with each other. In order to avoid such intersymbol interference, individual optical pulses are transmitted at a lower rate in multimode systems. [0003] However, fibers designed to support only one fundamental mode at a specific wavelength ...

Claims

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Application Information

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IPC IPC(8): G02B6/34H04B10/18
CPCG02B6/29377G02B6/0228H04B10/2525G02B6/03694G02B6/02261G02B6/03644G02B6/03611G02B6/02285
Inventor 拉丝·格兰纳-尼尔森鲍尔·克里斯坦森全尼冲·乐玛丽·万德尔
Owner FITEL美国公司
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