S band distributed optical fiber Raman amplifier

Abstract

This invention relates to a S-wave band distribution fiber Laman amplifier, which comprises fiber laser, pump-signal fiber wavelength-division multiplex, monomode optical fiber of 50 km, dispersion compensated optical fiber of 5km, gain flat filter, first light separator and second light separator. The dispersion compensated optical fiber output end is connected with input end of monomode optical fiber; the output end of monomode optical fiber is connected with one end of pump-signal fiber wavelength-division multiplex; the other end of the multiplex is connected with the input ends of fiber laser and gain flat filter.

Description

technical field

[0001] The invention relates to an S-band distributed optical fiber Raman amplifier, which belongs to the field of optical communication devices. Background technique

[0002] In the field of optical communication C, in the L-band Dense Wavelength Division Multiplexing (DWDM) optical fiber transmission system, the transmission loss can be compensated by a doped fiber amplifier (such as an erbium-doped fiber amplifier EDFA), which does not need to convert the optical signal into electrical energy in advance. In the case of a signal, the optical signal is directly amplified. EDFA can be used to amplify weak optical signals that have been transmitted over long distances and carry a large amount of data, so as to compensate for the attenuation caused by optical signals transmitted along long-distance optical fibers. However, EDFA is only suitable for C and L bands, and special doped optical fibers are required, and the noise factor of the optical amplifier is la...

Examples

Embodiment Construction

[0019] refer to figure 1 , the invented S-band distributed fiber Raman amplifier includes a fiber laser 26, a low-loss, broadband pump-signal fiber wavelength division multiplexer 25 for excitation light and transmission signal light, and a section of 50km single-mode fiber 24 , a section of 5km dispersion compensating fiber 22, a gain flattening filter 23, a first optical isolator 21 and a second optical isolator 27. The fiber laser 26 adopts a fiber Raman laser working in the 1428nm band, and its power is adjustable so that the gain of the amplifier is also adjustable. The gain flattening filter 23 is a fiber Bragg grating gain flattening filter, which can make the gain flat in the 1490-1540nm band range, and the gain flatness is less than ±0.5dB in the 50nm spectral range. Single-mode fiber 24 selects common G652 single-mode fiber 24 for use, figure 2 Shown is the actual measured Raman gain spectrum of ordinary G652 single-mode fiber under the pumping condition of 1428nm...

technical field

[0001] The invention relates to an S-band distributed optical fiber Raman amplifier, which belongs to the field of optical communication devices. Background technique

[0002] In the field of optical communication C, in the L-band Dense Wavelength Division Multiplexing (DWDM) optical fiber transmission system, the transmission loss can be compensated by a doped fiber amplifier (such as an erbium-doped fiber amplifier EDFA), which does not need to convert the optical signal into electrical energy in advance. In the case of a signal, the optical signal is directly amplified. EDFA can be used to amplify weak optical signals that have been transmitted over long distances and carry a large amount of data, so as to compensate for the attenuation caused by optical signals transmitted along long-distance optical fibers. However, EDFA is only suitable for C and L bands, and special doped optical fibers are required, and the noise factor of the optical amplifier is la...

Examples

Embodiment Construction

[0019] refer to figure 1 , the invented S-band distributed fiber Raman amplifier includes a fiber laser 26, a low-loss, broadband pump-signal fiber wavelength division multiplexer 25 for excitation light and transmission signal light, and a section of 50km single-mode fiber 24 , a section of 5km dispersion compensating fiber 22, a gain flattening filter 23, a first optical isolator 21 and a second optical isolator 27. The fiber laser 26 adopts a fiber Raman laser working in the 1428nm band, and its power is adjustable so that the gain of the amplifier is also adjustable. The gain flattening filter 23 is a fiber Bragg grating gain flattening filter, which can make the gain flat in the 1490-1540nm band range, and the gain flatness is less than ±0.5dB in the 50nm spectral range. Single-mode fiber 24 selects common G652 single-mode fiber 24 for use, figure 2 Shown is the actual measured Raman gain spectrum of ordinary G652 single-mode fiber under the pumping condition of 1428nm...

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