Optical fiber, transmission system and multiple-wavelength transmission system
A technology of optical fiber and optical mode, which is applied in the field of suppressing stimulated Brillouin scattering (hereinafter referred to as the field of SBS), to achieve the effect of reducing stimulated Brillouin scattering and suppressing the occurrence of SBS
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[0120] [Conventional example]
[0121] right figure 2 , image 3 The illustrated conventional example will be described in further detail.
[0122] Image 6 This is an example of a conventional refractive index profile. The following characteristics can be obtained by using such a refractive index distribution. in addition, Figure 7 The distribution of optical power and acoustic mode in this conventional example is shown.
[0123] The cut-off wavelength of the fiber is 1.27μm
[0124] The cut-off wavelength of the optical cable is 1.21μm
[0125] The mode field diameter (Petermann II) was 9.43 μm at a wavelength of 1310 nm and 10.57 μm at a wavelength of 1550 nm.
[0126] · The zero dispersion wavelength is 1307.0 nm.
[0127] - The wavelength dispersion value was 0.26 ps / nm / km at a wavelength of 1310 nm and 17.43 ps / nm / km at a wavelength of 1550 nm.
[0128] - Bending loss at a bending diameter of 20 mm was 1.0 dB / m at a wavelength of 1310 nm and 19.7 dB / m at a wa...
no. 1 Embodiment
[0133] Figure 9 The refractive index distribution of the first example is shown. The optical fiber of the first embodiment has a distribution in which the refractive index has a maximum refractive index near the center and decreases with a substantially constant slope with respect to the radius. The following description has Figure 9 Optical properties of optical fibers for the refractive index profiles shown. in addition, Figure 10 Indicates the distribution of optical power and acoustic mode in this embodiment.
[0134] The cut-off wavelength of the fiber is 1.25μm
[0135] The cut-off wavelength of the optical cable is 1.20μm
[0136] The mode field diameter (Petermann II) was 9.46 μm at a wavelength of 1310 nm and 10.86 μm at a wavelength of 1550 nm.
[0137] · The zero dispersion wavelength is 1330.5 nm.
[0138] - The wavelength dispersion value is -1.90 ps / nm / km at a wavelength of 1310 nm and 16.27 ps / nm / km at a wavelength of 1550 nm.
[0139] - Bending loss ...
no. 2 Embodiment
[0144] Figure 12 The refractive index distribution of the second example is shown. The optical fiber of the second embodiment has a refractive index distribution in which the core is composed of two layers. The following description has Figure 12 Optical properties of optical fibers for the refractive index profiles shown. in addition, Figure 13 Indicates the distribution of optical power and acoustic mode in this embodiment.
[0145] The cut-off wavelength of the fiber is 1.29 μm
[0146] The cut-off wavelength of the optical cable is 1.22μm
[0147] The mode field diameter (Petermann II) was 9.27 μm at a wavelength of 1310 nm and 10.53 μm at a wavelength of 1550 nm.
[0148] · The zero dispersion wavelength is 1326.3 nm.
[0149] - The wavelength dispersion value is -1.55 ps / nm / km at a wavelength of 1310 nm and 16.77 ps / nm / km at a wavelength of 1550 nm.
[0150] - Bending loss at a bending diameter of 20 mm was 0.5 dB / m at a wavelength of 1310 nm and 12.8 dB / m at ...
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