CN218182701U - Second-order forward Raman fiber amplifier - Google Patents
Second-order forward Raman fiber amplifier Download PDFInfo
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- CN218182701U CN218182701U CN202222768950.1U CN202222768950U CN218182701U CN 218182701 U CN218182701 U CN 218182701U CN 202222768950 U CN202222768950 U CN 202222768950U CN 218182701 U CN218182701 U CN 218182701U
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Abstract
The utility model relates to a network communication amplifier field especially relates to a raman fiber amplifier is preceding to second order. The utility model discloses a two kinds of pump laser, two kinds of pump light are launched to the form of second order pump laser and first order pump laser promptly, can solve the energy loss problem that the pump energy utilization is not fully brought among the current raman fiber amplifier, adopt simultaneously for the first time to mix the TiO problem of energy loss 2 The optical fiber is used as a gain medium of a second-order forward Raman optical fiber amplifier, and TiO doped is realized 2 The gain effect of the Raman fiber amplifier is obviously improved after the stimulated Raman scattering effect acts on the optical fiber, the gain flatness is reduced, and the power conversion efficiency of the pump light is obviously improved.
Description
Technical Field
The utility model relates to a network communication amplifier field especially relates to a raman fiber amplifier is preceding to second order.
Background
In recent years, a raman fiber amplifier is considered as a key device for solving the problem of signal attenuation in an all-optical network by virtue of the advantages of any bandwidth amplification, flexible pumping configuration, short action length and the like.
At present, a common raman fiber amplifier adopts a mode of directly amplifying signal light by a plurality of first-order pump lights, after the high-power pump lights are injected into an optical fiber, a stimulated raman scattering effect is generated between the high-power pump lights and a fiber core material, and the energy of the pump lights is downwards moved to the signal light with lower frequency, so that the signal light is amplified. However, the first-order raman fiber amplifier still has the problems of large spontaneous emission noise, insufficient pumping utilization, short amplification distance and the like.
Therefore, a novel raman fiber amplifier with low noise coefficient and high energy conversion efficiency is urgently needed to solve the problem of energy loss caused by insufficient utilization of pumping energy in the existing raman fiber amplifier. The second-order raman amplification is similar to the first-order raman amplification principle, and the conventional first-order RFA is to perform the first-order raman amplification on the signal light with the frequency of about 1.5 μm by using the pump light with the frequency of about 1.4 μm, and the frequency shift difference between the pump light and the signal light is 13.2THz, which is exactly one Stokes frequency shift. The second-order raman amplification uses a second-order raman shift to achieve an amplification function, and is different in that the second-order raman amplification is a relay amplification. The second-order RFA adds a second-order pump at a Stokes frequency shift position higher than the frequency of the first-order pump, namely about 1.3 mu m in frequency, the second-order pump firstly amplifies the first-order pump, and the amplified first-order pump then amplifies the signal light.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a raman fiber amplifier is preceding to second order, and noise figure is low and energy conversion is efficient.
In order to achieve the above object, the utility model provides a following scheme:
a second order forward raman fiber amplifier comprising: n pump lasers, optical coupler, optical isolator, band-pass filter, tiO doped laser 2 An optical fiber;
the n pump lasers are connected with the input end of the optical coupler through transmission optical fibers and used for emitting pump light, and the pump laser comprises:
the n pump lasers at least comprise 1 second-order pump laser and 1 first-order pump laser;
the output end of the optical coupler passes through the TiO-doped 2 The optical fiber is connected with the input end of the band-pass filter; the optical isolator is embedded in the TiO-doped layer 2 A position within the optical fiber near the end connected to the optical coupler;
the optical coupler is used for optically coupling the pump light and the signal light to form coupled light;
the optical isolator is used for limiting backward-propagating Rayleigh scattered light in the TiO-doped 2 Transmission in an optical fiber; the Rayleigh scattered light is generated by the coupled light in the transmission process;
the TiO-doped 2 The optical fiber is used for amplifying the signal light in the coupled light through a stimulated Raman scattering effect to obtain amplified coupled light;
the band-pass filter is used for filtering the pump light in the amplified coupled light to obtain amplified signal light.
Preferably, the TiO-doped 2 The length of the fiber was 6km.
Preferably, m optical transmitters, wavelength division multiplexers and m optical receivers are further included;
the m optical transmitters are connected with the input end of the optical coupler through transmission optical fibers;
the input end of the wavelength division multiplexer is connected with the output end of the band-pass filter through a transmission optical fiber;
the output end of the wavelength division multiplexer is connected with the m optical receivers through a transmission optical fiber; the wavelength division multiplexer is used for converting the amplified signal light into m paths of single-beam light with different wavelengths and respectively sending the m paths of single-beam light with different wavelengths to the m optical receivers in a one-to-one correspondence manner.
Preferably, the central wavelengths of m said optical transmitters range from 1565 to 1625nm, and the wavelength interval between m said optical transmitters is a multiple of 3.
Preferably, 1 of the second order pump lasers and 3 of the first order pump lasers are used for the n pump lasers.
Preferably, the wavelength of 1 second-order pump laser is 1408.3nm, and the wavelength of 3 first-order pump lasers is 1458.1nm, 1463.7nm and 1503.1nm respectively.
Preferably, the power of 1 of the second order pump lasers is 0.11w, and the power of 3 of the first order pump lasers is 0.4W, 0.53W and 0.58W respectively.
Preferably, the wavelengths of the n pump lasers are each less than the smallest of the center wavelengths of the m optical transmitters.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
the utility model discloses a two kinds of pump laser, two kinds of pump light are launched to the form of second order pump laser and first order pump laser promptly, can solve the energy loss problem that the pump energy utilization is not fully brought among the current raman fiber amplifier, adopt simultaneously for the first time to mix the TiO problem of energy loss 2 The optical fiber is used as a gain medium of a forward Raman optical fiber amplifier, and TiO is doped 2 The gain effect of the Raman fiber amplifier is obviously improved after the stimulated Raman scattering effect acts on the optical fiber, the gain flatness is reduced, and the power conversion efficiency of the pump light is obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a structural diagram of a second-order forward raman fiber amplifier according to an embodiment of the present invention;
FIG. 2 shows a TiO doped semiconductor device according to an embodiment of the present invention 2 A Raman gain spectrum of the optical fiber;
fig. 3 is an output gain diagram of a second-order forward raman fiber amplifier according to an embodiment of the present invention.
Description of the symbols:
optical transmitter-1, pump laser-2, transmission fiber-3, optical coupler-4, tiO doped 2 An optical fiber-5, an optical isolator-6, a band-pass filter-7, a wavelength division multiplexer-8 and an optical receiver-9.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a raman fiber amplifier is preceding to second order, and noise figure is low and energy conversion is efficient.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the following detailed description.
Example 1
In order to achieve the above object, embodiment 1 of the present invention provides a second-order forward raman fiber amplifier. As shown in fig. 1, a second-order forward raman fiber amplifier provided in an embodiment of the present invention includes: n pump lasers 2, an optical coupler 4, an optical isolator 6, a band-pass filter 7 and a TiO-doped laser 2 An optical fiber 5;
the n pump lasers 2 are connected with the input end of the optical coupler 4 through a transmission fiber 3, and are used for emitting pump light, and the pump laser comprises:
the n pump lasers 2 at least comprise 1 second-order pump laser and 1 first-order pump laser;
the output end of the optical coupler 4 passes through the TiO-doped 2 The optical fiber 5 is connected with the input end of the band-pass filter 7; the optical isolator 6 is embedded in the TiO-doped material 2 Proximity and within the optical fiber 5The position of the end to which the optical coupler 4 is connected;
the optical coupler 4 is used for optically coupling the pump light and the signal light to form coupled light;
the optical isolator 6 is used for limiting backward-propagating Rayleigh scattered light in the TiO-doped 2 Transmission in the optical fiber 5; the Rayleigh scattered light is generated by the coupled light in the transmission process;
the doped TiO 2 The optical fiber 5 is used for amplifying the signal light in the coupled light through a stimulated raman scattering effect to obtain amplified coupled light;
the band-pass filter 7 is configured to filter pump light in the amplified coupled light to obtain amplified signal light.
Further, when in specific use, the second-order forward raman fiber amplifier further includes m optical transmitters 1, a wavelength division multiplexer 8, and m optical receivers 9;
the m optical transmitters 1 are connected with the input end of the optical coupler 4 through a transmission optical fiber 3;
the input end of the wavelength division multiplexer 8 is connected with the output end of the band-pass filter 7 through a transmission optical fiber 3;
the output end of the wavelength division multiplexer 8 is connected with the m optical receivers 9 through the transmission optical fiber 3; the wavelength division multiplexer 8 is configured to convert the amplified signal light into m paths of single beams of light with different wavelengths, and respectively send the m paths of single beams of light with different wavelengths to the m optical receivers 9 in a one-to-one correspondence manner.
Wherein, the optical transmitter 1 is used for emitting signal light with different wavelengths to be amplified, the pump laser 2 emits pump light with different wavelengths (generally, the pump light wavelength is determined according to the fiber Raman gain spectrum and the signal light wavelength) for generating stimulated Raman scattering effect with the signal light in transmission so as to amplify the signal light, and the optical coupler 4 is used for coupling the pump light into the TiO-doped optical fiber 2 The optical fiber 5 and the optical isolator 6 only allow the light to pass through from front to back in a single direction, the band-pass filter 7 can filter the pump light out of the signal light wavelength range and only allow the signal light to pass through, and the wavelength division multiplexer 8 is used for converting the multi-path signal light originally emitted by the optical transmitter 1 into multi-path signal lightThe optical receiver 9 is used to receive the amplified optical signal as a single beam of light with different wavelengths.
TiO doped 2 The optical fiber can improve the gain effect of the forward Raman fiber amplifier.
Illustratively, n pump lasers 2 may employ 1 second-order pump laser and 3 first-order pump lasers.
As a specific embodiment, but not limited to this embodiment, specific parameters of the m optical transmitters 1 and 4 pump lasers 2 (1 st pump laser, 2 nd pump laser, 3 rd pump laser, and 4 th pump laser, respectively, where the 1 st pump laser is a second-order pump laser, and the 2 nd pump laser, the 3 rd pump laser, and the 4 th pump laser are first-order pump lasers) are:
central wavelength lambda of optical transmitter i ：1565-1625nm；λ i The center wavelength of the ith optical transmitter.
Wavelength interval Δ λ of optical transmitter: 3nm;
the power of the optical transmitter is: 0.1mW;
1 st pump laser: wavelength lambda p1 =1408.3nm; power p 1 ＝0.4W；
Pump laser 2: wavelength lambda p2 =1458.1nm; power p 2 ＝0.53W；
Pump laser No. 3: wavelength lambda p3 =1463.7nm; power p 3 ＝0.58W；
Pump laser 4: wavelength lambda p4 =1503.1nm; power p 4 ＝0.11W；
TiO doped 2 Length of optical fiber: l =6km;
example 2
The embodiment 2 of the present invention specifically sets up the quantity of the optical transmitter 1 to be 21, i.e. the value of m is 21. 21 paths of signal light with different wavelengths emitted by the 21 optical transmitters 1 are transmitted through the transmission optical fiber 3, and transmitted with 4 paths of pump light emitted by the 4 pump lasers 2 through the section of the transmission optical fiber 3 and then enter the optical coupler 4 to be coupledAfter combination, the mixture enters into the TiO-doped 2 The front end of the optical fiber 5, both of which are doped with TiO 2 Transmission in optical fiber 5, in TiO-doped 2 An optical isolator 6 is embedded in the fiber 5 to reduce losses due to backward propagating rayleigh scattered light. TiO doped signal light and pump light 2 When the signals are transmitted simultaneously in the optical fiber 5, the signal light is amplified by the stimulated raman scattering effect (the pump light with short wavelength emitted by the pump light transfers energy to the signal light with long wavelength). The amplified signal light is input to the input terminal of the band-pass filter 7 together with the residual pump light, and the band-pass filter 7 allows only light in the signal light wavelength range to pass therethrough, and filters out the residual pump light. The signal light output by the band-pass filter 7 is input into the wavelength division multiplexer 8 through the transmission optical fiber 3, the wavelength division multiplexer 8 is connected with the optical receiver 9 through the transmission optical fiber 3, the wavelength division multiplexer 8 separates out 21 paths of required signal light and transmits the signal light to the optical receiver 9, and the whole signal light amplification process is completed.
The utility model discloses can solve the not abundant energy loss problem that brings of pumping energy utilization among the current raman fiber amplifier, and showing of gain effect improves, reduced gain flatness, and then realized showing of the power conversion efficiency of pumping light and improve.
According to FIG. 2, the TiO is doped 2 Raman gain spectrum of optical fiber, second order pump light (lambda) p1 Frequency difference of =1408.3 nm) for the remaining three first-order pump lights is about 12THz (corresponding to 400cm abscissa) -1 ) Falling on the first peak from left to right of the curve, the frequency difference of the second-order pump light to the signal light is about 27THz (corresponding to 920cm abscissa) -1 ) The second peak falling from left to right of the curve, that is, the second-order pump light has an amplifying effect on the three first-order pump lights and the signal light at the same time. And the Raman frequency shift range is [0,1400 ]]cm -1 In this range, the frequency difference between the pump light and the signal light can be amplified to different degrees. When amplifying the signal light in L-band, selecting three frequency differences [274,506 ] with the signal light]cm -1 First order pump light in the range, one frequency difference with the signal light is [885,970%]cm -1 The second order pump light in the range is amplified jointly.
As shown in FIG. 3, the average gain reaches 26.9dB, and the gain flatness is only 1.14dB.
Based on the above specific embodiment, based on TiO doping 2 Second order forward Raman fiber amplifier for fiber 5 to dope TiO 2 The optical fiber is used as a gain medium, a mode of one second-order pump light and three first-order pump lights is adopted for forward injection into the fiber core, the L-waveband signal light is amplified, and finally, tiO-doped TiO with the length of 6km is injected forward when the pump light with the total pump power of 32dBm 2 The optical fiber 5 carries out second-order Raman amplification on 21 paths of signal light with the total power of 3dBm, experiments show that the total power of the signal light at the output end reaches 28.3dBm, the average power of the signal light at the output end is 15.1dBm, the average gain is 26.9dB, the gain flatness is only 1.14dB, the power conversion efficiency can reach 41.57%, wherein the power conversion efficiency formula is shown in the specification
The ratio of the difference between the output signal optical power and the input signal optical power to the input pump optical power, that is, how much the energy of the pump light is applied to the signal light amplification, is shown.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the description of the method part.
The principle and the implementation of the present invention are explained by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the utility model, the concrete implementation mode and the application scope can be changed. In summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A second order forward Raman fiber amplifier, comprisingCharacterized in that it comprises: n pump lasers, optical coupler, optical isolator, band-pass filter, tiO doped laser 2 An optical fiber;
the n pump lasers are connected with the input end of the optical coupler through transmission optical fibers and used for emitting pump light, and the pump laser comprises:
the n pump lasers at least comprise 1 second-order pump laser and 1 first-order pump laser;
the output end of the optical coupler passes through the TiO-doped 2 The optical fiber is connected with the input end of the band-pass filter; the optical isolator is embedded in the TiO-doped layer 2 A position within the optical fiber near an end connected to the optical coupler;
the optical coupler is used for optically coupling the pump light and the signal light to form coupled light;
the optical isolator is used for limiting backward-propagating Rayleigh scattered light in the TiO-doped 2 Transmission in an optical fiber; the Rayleigh scattered light is generated by the coupled light in the transmission process;
the TiO-doped 2 The optical fiber is used for amplifying the signal light in the coupled light through a stimulated Raman scattering effect to obtain amplified coupled light;
the band-pass filter is used for filtering the pump light in the amplified coupled light to obtain amplified signal light.
2. The second-order forward raman fiber amplifier according to claim 1, wherein said TiO-doped fiber is characterized by 2 The length of the fiber was 6km.
3. The second-order forward raman fiber amplifier according to claim 1, further comprising m optical transmitters, wavelength division multiplexers, and m optical receivers;
the m optical transmitters are connected with the input end of the optical coupler through transmission optical fibers;
the input end of the wavelength division multiplexer is connected with the output end of the band-pass filter through a transmission optical fiber;
the output end of the wavelength division multiplexer is connected with the m optical receivers through a transmission optical fiber; the wavelength division multiplexer is used for converting the amplified signal light into m paths of single-beam light with different wavelengths and respectively sending the m paths of single-beam light with different wavelengths to the m optical receivers in a one-to-one correspondence manner.
4. A second-order forward raman amplifier according to claim 3, wherein the central wavelength of m said optical transmitters ranges from 1565 nm to 1625nm, and the wavelength interval between m said optical transmitters is a multiple of 3.
5. The second-order forward raman amplifier according to claim 1, wherein n said pump lasers employs 1 said second-order pump laser and 3 said first-order pump lasers.
6. A second order forward Raman fiber amplifier according to claim 5, wherein 1 of said second order pump lasers has a wavelength of 1408.3nm and 3 of said first order pump lasers has a wavelength of 1458.1nm, 1463.7nm, 1503.1nm, respectively.
7. A second order forward Raman fiber amplifier according to claim 5, wherein the power of 1 of said second order pump lasers is 0.11W and the power of 3 of said first order pump lasers is 0.4W, 0.53W, 0.58W, respectively.
8. A second order forward raman fiber amplifier according to claim 3, characterized in that the wavelengths of each of n said pump lasers is smaller than the smallest of the central wavelengths of m said optical transmitters.
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| CN202222768950.1U CN218182701U (en) | 2022-10-20 | 2022-10-20 | Second-order forward Raman fiber amplifier |
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| CN202222768950.1U CN218182701U (en) | 2022-10-20 | 2022-10-20 | Second-order forward Raman fiber amplifier |
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