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Optical fiber, transmission system and multiple-wavelength transmission system

A technology of optical fiber and light intensity distribution, applied in the field of suppressing stimulated Brillouin scattering (hereinafter referred to as SBS field, to achieve the effect of reducing stimulated Brillouin scattering

Inactive Publication Date: 2007-10-03
THE FUJIKURA CABLE WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, in optical transmission using an optical fiber, there are cases where, even if light of a certain power or more is incident on the optical fiber, only a certain amount of light can be incident due to SBS, which is a nonlinear phenomenon. The amount of light (hereinafter referred to as the SBS threshold power
), the rest of the light becomes backscattered light and returns to the incident light side, thereby limiting the signal light power in the input part (for example, refer to Non-Patent Document 1

Method used

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  • Optical fiber, transmission system and multiple-wavelength transmission system
  • Optical fiber, transmission system and multiple-wavelength transmission system
  • Optical fiber, transmission system and multiple-wavelength transmission system

Examples

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Embodiment

[0133] [Conventional example]

[0134] The conventional examples shown in FIGS. 2 and 3 will be described in further detail.

[0135] Fig. 6 is an example of a conventional type refractive index distribution. The following characteristics can be obtained by using such a refractive index distribution. In addition, FIG. 7 shows distributions of optical power and acoustic modes in this conventional example.

[0136] · Fiber cut-off wavelength is 1.27μm

[0137] ·Cable cut-off wavelength is 1.21μm

[0138] ·The mode field diameter (Petermann II) is 9.43 μm at a wavelength of 1310 nm and 10.57 μm at a wavelength of 1550 nm.

[0139] ·The zero dispersion wavelength is 1307.0nm.

[0140] ·Wavelength dispersion value is 0.26ps / nm / km when the wavelength is 1310nm, and is 17.43ps / nm / km when the wavelength is 1550nm.

[0141] ·The bending loss when the bending diameter is 20mm is 1.0dB / m when the wavelength is 1310nm, and it is 19.7dB / m when the wavelength is 1550nm.

[0142] · Op...

no. 1 Embodiment

[0146] Fig. 9 shows the refractive index distribution of the first embodiment. The optical fiber of the first embodiment has a distribution in which the refractive index has a maximum value near the center and decreases at a substantially constant slope with respect to the radius. Next, optical characteristics of an optical fiber having the refractive index profile shown in Fig. 9 will be described. In addition, FIG. 10 shows distributions of optical power and acoustic modes in this embodiment.

[0147] · Fiber cut-off wavelength is 1.25μm

[0148] ·Cable cut-off wavelength is 1.20μm

[0149] ·The mode field diameter (Petermann II) is 9.46 μm at a wavelength of 1310 nm and 10.86 μm at a wavelength of 1550 nm.

[0150] ·The zero dispersion wavelength is 1330.5nm.

[0151] ·Wavelength dispersion value is -1.90ps / nm / km when the wavelength is 1310nm, and is 16.27ps / nm / km when the wavelength is 1550nm.

[0152] ·The bending loss when the bending diameter is 20mm is 2.6dB / m whe...

no. 2 Embodiment

[0157] Fig. 12 shows the refractive index distribution of the second example. The optical fiber of the second embodiment has a refractive index distribution in which the core is composed of two layers. Next, optical characteristics of an optical fiber having the refractive index profile shown in Fig. 12 will be described. In addition, FIG. 13 shows distributions of optical power and acoustic modes in this embodiment.

[0158] · Fiber cut-off wavelength is 1.29μm

[0159] ·Cable cut-off wavelength is 1.22μm

[0160] ·The mode field diameter (Petermann II) is 9.27 μm at a wavelength of 1310 nm and 10.53 μm at a wavelength of 1550 nm.

[0161] ·The zero dispersion wavelength is 1326.3nm.

[0162] ·Wavelength dispersion value is -1.55ps / nm / km when the wavelength is 1310nm, and is 16.77ps / nm / km when the wavelength is 1550nm.

[0163] ·The bending loss when the bending diameter is 20mm is 0.5dB / m when the wavelength is 1310nm, and it is 12.8dB / m when the wavelength is 1550nm. ...

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Abstract

The invention provides an optical fiber. In an optical fiber, a first mode field diameter of a basic mode of an acoustic mode generated in the optical fiber is different from a second mode field diameter of a light intensity distribution of the optical fiber. A transmission system is configured to perform analog signal transmission or base band transmission or optical SCM transmission by using such optical fiber.

Description

technical field [0001] The present invention relates to an optical fiber capable of suppressing the occurrence of stimulated Brillouin scattering (hereinafter referred to as SBS) and transmitting higher-power signals. [0002] The present invention claims Japanese Patent Application No. 2004-321912 filed on November 5, 2004, Japanese Patent Application No. 2005-77008 filed on March 17, 2005, and Japanese Patent Application filed on July 6, 2005 Priority No. 2005-197639, the contents of which are incorporated herein. Background technique [0003] In recent years, fiber-to-the-home (Fiber To The Home: hereinafter referred to as FTTH.) services have started to connect optical fiber to each home and exchange various information using the optical fiber. [0004] As one form of FTTH for transmitting various information, there is a system (ITUT Recommendation G.983.3) in which a broadcast signal and other communication signals are simultaneously transmitted using a single optical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/036H04B10/02H04B10/18H04B10/2537H04J14/02
Inventor 松尾昌一郎谷川庄二内山圭祐姬野邦治
Owner THE FUJIKURA CABLE WORKS LTD