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Wave-division shared transmission path and dispersion compensation optical fiber

A technology of dispersion compensation optical fiber and transmission path, which is applied in the field of dispersion compensation optical fiber link dispersion shifted optical fiber, and can solve problems such as waveform degradation, transmission distance limitation, and unsuitability

Inactive Publication Date: 2002-10-23
FUJIKURA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, since the conventional NZDSF has a zero-dispersion wavelength near 1520nm or 1580nm, it is easy to generate noise due to four-wave mixing in these wavelength bands
Therefore, NZDSF has the disadvantage that it is not suitable for WDM transmission on S-band and L-band
[0008] Although the zero-dispersion wavelength of standard single-mode fiber is not in any of the S-band, C-band, and L-band, standard single-mode fiber has high chromatic dispersion in these bands, and due to the long-distance transmission Effect of accumulated dispersion (i.e., residual dispersion) on optical signals, which has the disadvantage of waveform degradation caused by interference between adjacent signals
Another disadvantage is that at L-band (where the residual chromatic dispersion is high), the transmission distance is limited

Method used

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  • Wave-division shared transmission path and dispersion compensation optical fiber
  • Wave-division shared transmission path and dispersion compensation optical fiber
  • Wave-division shared transmission path and dispersion compensation optical fiber

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0164] Experimental examples of the present invention will be described in detail below.

[0165] The WDM transmission path shown in Fig. 1 is fabricated. The used wavebands of the WDM transmission path include S-band, C-band, and L-band, ie, 1460nm to 1630nm.

[0166] An optical fiber having the refractive index profile shown in FIG. 2 was used as the dispersion-shifted optical fiber 1 . The structural parameters and optical properties of this dispersion-shifted fiber are shown in Figures 4A and 4B.

[0167] Optical fibers having the refractive index profiles shown in Fig. 3 were used as dispersion compensating optical fibers 2b, 3b, and 4b.

[0168] Moreover, the compensation band of the dispersion compensation fiber 2b includes the entire S band (center wavelength: 1495nm), the compensation band of the dispersion compensation fiber 3b includes the entire C band (center wavelength: 1550nm), and the compensation band of the dispersion compensation fiber 4b includes the enti...

experiment example 2

[0186] This experimental example is the same as experimental example 1, except that the compensation band of the dispersion compensation fiber 2b is set to from 1490nm to 1530nm (center wavelength: 1510nm) in the S band, the length of the optical fiber is as follows:

[0187] Dispersion-shifted fiber 1: 40km (km)

[0188] Dispersion compensation fiber 2b: 16.4km

[0189] Dispersion compensation fiber 3b: 6.3km

[0190] Dispersion compensation fiber 4b: 4.9km

[0191] 9A and 9B show structural parameters and optical characteristics of the dispersion compensating fiber 2b.

[0192] FIG. 10A is a graph showing the relationship between chromatic dispersion and wavelength in an optical fiber and a WDM transmission path. FIG. 10B is a diagram showing enlarged the relationship between the residual chromatic dispersion and the wavelength in the WDM transmission path.

[0193] In the band from 1490nm to 1620nm, the cumulative dispersion of the entire WDM transmission path is greate...

experiment example 3

[0198] 11A and 11B show structural parameters and optical characteristics of a dispersion compensating fiber that can be used instead of the dispersion compensating fiber 2b.

[0199] The length of the dispersion compensating fiber is adjusted according to the chromatic dispersion characteristic. 11C shows the length ratio, the compensation wavelength range, and the maximum absolute value of residual chromatic dispersion in the compensation wavelength range in the case where the dispersion-shifted fibers are linked similarly to Experimental Examples 1 and 2.

[0200] As shown in this experimental example, the optical characteristics of the dispersion compensating fiber of this experimental example can be adjusted according to its intended use purpose. Moreover, these results are useful for high-speed communications between 10 and 40 Gbit / s in the S-band at 1460 nm to 1530 nm or at 1490 nm to 1530 nm from the viewpoint of residual chromatic dispersion when forming a WDM transmi...

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Abstract

In the wavelength division multiplexing transmission path, the band used can be selected from the widest band including S-band, C-band, and L-band. A wavelength-division multiplexing transmission path having a dispersion-compensating transmission path (5) comprising a dispersion-shifting fiber (1) having positive chromatic dispersion in the wavelength range from 1460 nm to 1630 nm; and a type of dispersion-compensating fiber, or Two or more types of dispersion compensating fibers (2b, 3b, 4b) with different chromatic dispersion, having negative chromatic dispersion in the compensation band selected within the above range; for wavelength division multiplexing transmission paths Residual chromatic dispersion is adjusted to be greater than or equal to -1.0 ps / nm / km and less than or equal to +1.0 ps / nm / km in the wavelength band (selected from the above-mentioned range) used for the wavelength division multiplexing transmission path .

Description

technical field [0001] The present invention relates to wavelength division multiplexing (WDM) transmission paths, which are dispersion-shifted optical fibers linked by dispersion compensating optical fibers. Background technique [0002] The lowest transmission loss in silica fiber is at a wavelength around 1550nm, which is traditionally used for long-distance transmission. Generally, a dispersion-shifted fiber having a low absolute value of chromatic dispersion in the 1550 nm band is used as a transmission path in this case. In response to the recent demand for large-capacity optical communication, an optical communication system using light of a high-power signal obtained from a WDM signal and using an optical amplifier has emerged. [0003] On the other hand, when the chromatic dispersion value of the fiber reaches zero in the wavelength band used, four-wave mixing (which is a nonlinear optical effect) tends to occur; this is undesirable in WDM transmission. For this r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/036H04B10/2507H04B10/2513H04B10/2563H04J14/00H04J14/02
CPCG02B6/02019G02B6/02261G02B6/02271G02B6/0228G02B6/03611G02B6/03644G02B6/29377H04B10/25253H04B2210/258
Inventor 斋藤学爱川和彦松尾昌一郎
Owner FUJIKURA LTD