CN203661069U - A gain spectrum flattening Raman optical fiber amplifier based on tellurite-based optical fibers - Google Patents

A gain spectrum flattening Raman optical fiber amplifier based on tellurite-based optical fibers Download PDF

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CN203661069U
CN203661069U CN201420009099.7U CN201420009099U CN203661069U CN 203661069 U CN203661069 U CN 203661069U CN 201420009099 U CN201420009099 U CN 201420009099U CN 203661069 U CN203661069 U CN 203661069U
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optical fiber
optical
pump laser
output
wave multiplexer
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王沛
左旭
宁博
向红丽
赵云
袁心易
巩译
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Xian University of Posts and Telecommunications
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Abstract

The utility model discloses a gain spectrum flattening Raman optical fiber amplifier based on tellurite-based optical fibers. The gain spectrum flattening Raman optical fiber amplifier is connected to optical transmitters and optical receivers. The gain spectrum flattening Raman optical fiber amplifier comprises a first pump laser, a first combiner, an optical isolator, a band elimination filter, a second pump laser, a second combiner and a wave separator. Multiple optical transmitters and multiple optical receivers are arranged. The optical transmitters are connected with the first combiner through first optical fibers. The first pump laser is connected with the first combiner through a first-section second optical fiber. The output end of the first combiner is connected with the optical isolator through a first-section third optical fiber. The optical isolator is connected with the band elimination filter through a fourth optical fiber. The band elimination filter is connected with the second combiner through a fifth optical fiber. The second pump laser is connected with the second combiner through a second-section second optical fiber. The output end of the second combiner is connected with the wave separator through a second-section third optical fiber. The wave separator is connected with the optical receivers through sixth optical fibers. The gain spectrum flattening Raman optical fiber amplifier is simple in structure, can achieve gain flattening, is highly practical and is good in using effect.

Description

A kind of gain spectrum flattening Raman Fiber Amplifier based on telluro optical fiber
Technical field
The utility model relates to optical communication technique field, particularly a kind of gain spectrum flattening Raman Fiber Amplifier based on telluro optical fiber.
Background technology
As everyone knows, light is in the time of long Distance Transmission, owing to decayed by transmitting power, receiver sensitivity, fibre circuit, and impact and the restriction of the factor such as dispersion, light pulse is exported after Optical Fiber Transmission certain distance from optical sender, and its amplitude can be decayed, and waveform also there will be distortion.Therefore, grow the signal transmission of distance, just need to after optical signal transmission certain distance, add amplifier, to amplify the signal of decay, light pulse be regenerated.
Before erbium-doped optical fiber amplifier EDFA (Erbium Doped Fiber Amplifier) utility model, due to direct amplifying optical signals, all optical fiber telecommunications systems all can only adopt light-electrical-optical trunking scheme.First light signal is become to the signal of telecommunication, amplify, the information processing such as regeneration in electric territory, and then become light signal and transmit in optical fiber, this trunking scheme device complexity, cost is high, transmission quality is lower.Erbium-doped fiber amplifier replaces traditional light-electrical-optical trunking scheme, when having realized in an optical fiber multipath light signal, amplifies, and greatly reduces the cost of light relaying; Can realize good coupling with Transmission Fibers, there is the advantages such as high-gain low-noise simultaneously.Therefore be successfully applied to optical WDM communication system, greatly increased information capacity and the transmission range that in optical fiber, can transmit.
But in the process of the whole optical fiber low-loss region bandwidth resources of further exploitation, near the 1550nm of traditional erbium-doped fiber amplifier, the bandwidth of about 30nm is just nowhere near and has used; And raman amplifier based on telluro optical fiber has the gain bandwidth of 50nm, as long as select suitable pump light, just can amplify the signal of any wave band, and its output gain is high, gain flatness good, the response time is fast, saturation output power is large, noise figure is low and be easy to coupling, this to dense wavelength division multiplexing system capacity expansion and upgrading, reduce costs and increase business etc. has very important Technological Economy and is worth.
Utility model content
The purpose of this utility model is that a kind of gain spectrum flattening Raman Fiber Amplifier based on telluro optical fiber will be provided, it is simple in structure, reasonable in design, realization is convenient and cost is low, output gain is high, gain flatness good, the response time is fast, saturation output power is large, noise figure is low and be easy to coupling, practical, result of use is good, is convenient to promote the use of.
For achieving the above object, the utility model is implemented according to following technical scheme:
A kind of gain spectrum flattening Raman Fiber Amplifier based on telluro optical fiber, be connected in optical sender and optical receiver, comprise the first pump laser, the first wave multiplexer, optical isolator, band stop filter, the second pump laser, the second wave multiplexer and channel-splitting filter, described optical sender and optical receiver are set to multiple, the output of multiple optical senders is connected with the input of the first wave multiplexer by the first optical fiber accordingly, the output of described the first pump laser is connected with the input of the first wave multiplexer by first paragraph the second optical fiber, the output of described the first wave multiplexer is by connecting the input of optical isolator for first paragraph the 3rd optical fiber, the output of described optical isolator connects the input of band stop filter by the 4th optical fiber, the output of described band stop filter connects the input of the second wave multiplexer by the 5th optical fiber, the output of described the second pump laser is connected with the input of described the second wave multiplexer by second segment the second optical fiber, the output of described the second wave multiplexer connects the input of channel-splitting filter by second segment the 3rd optical fiber, the output correspondence of described channel-splitting filter is connected with the input of multiple optical receivers by many six fiberses, the central wavelength lambda of any one in the different and multiple described optical senders of the centre wavelength of described multiple optical senders iall be greater than the central wavelength lambda of described the first pump laser 1Pcentral wavelength lambda with described the second pump laser 2P, and
Figure BDA0000454203230000021
span be 300cm -1～500cm -1, span be 420cm -1～620cm -1, wherein, i is that the value of the number of channel and i is 1～N, N is flashlight sum and is integer.
As further preferred version of the present utility model, the central wavelength lambda of any one in described multiple optical senders icentral wavelength lambda with described the first pump laser 1Pmeet frequency displacement computing formula Δ v=(1/ λ 1P)-(1/ λ i), wherein, Δ v is that the span of frequency shift amount and Δ v is 300cm -1～500cm -1.
As further preferred version of the present utility model, the central wavelength lambda of any one in described multiple optical senders icentral wavelength lambda with described the second pump laser 2Pmeet frequency displacement computing formula Δ v=(1/ λ 2P)-(1/ λ i), wherein, Δ v is that the span of frequency shift amount and Δ v is 420cm -1～620cm -1.
As further preferred version of the present utility model, described first paragraph the 3rd optical fiber and second segment the 3rd optical fiber (6) are telluro highly nonlinear optical fiber, and the raman gain spectrum of described telluro highly nonlinear optical fiber is at 300cm -1～620cm -1frequency swing in normalization Raman gain coefficienct scope be 0.82 × 10 -12m/W～2.5 × 10 -12m/W.
As further preferred version of the present utility model, described band stop filter centre wavelength is identical with the first pump laser centre wavelength.
Compared with prior art, the utility model is simple in structure, reasonable in design, realization is convenient and cost is low, and output gain is high, gain flatness good, the response time is fast, saturation output power is large, noise figure is low and be easy to coupling, practical, result of use is good, is convenient to promote the use of.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model;
In figure: the 1-the first optical fiber; 2-first paragraph the second optical fiber; 3-first paragraph the 3rd optical fiber; The 4-the four optical fiber; The 5-the five optical fiber; 6-second segment the 3rd optical fiber; The 7-the six fibers; 8-optical sender; The 9-the first pump laser; The 10-the first wave multiplexer; 11-optical isolator; 12-band stop filter; The 13-the second pump laser; The 14-the second wave multiplexer; 15-channel-splitting filter; 16-optical receiver; 17-second segment the second optical fiber;
Fig. 2 is the raman gain spectrum of the utility model the 3rd optical fiber;
Fig. 3 be in the utility model signal light power with the Changing Pattern figure of fiber lengths;
Fig. 4 is the output gain figure of each flashlight of the utility model fiber Raman amplifier.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment thereof, the utility model is further described, is used for explaining the utility model in illustrative examples and the explanation of this utility model, but not as to restriction of the present utility model.
Of the present utility model a kind of gain spectrum flattening Raman Fiber Amplifier based on telluro optical fiber as shown in Figure 1, be connected in optical sender 8 and optical receiver 16, comprise the first pump laser 9, the first wave multiplexer 10, optical isolator 11, band stop filter 12, the second pump laser 13, the second wave multiplexer 14 and channel-splitting filter 15, described optical sender 8 and optical receiver 16 are set to multiple, the output of described multiple optical sender 8 is connected with the input of the first wave multiplexer 10 by the first optical fiber 1, the output of described the first pump laser 9 is connected with the input of described the first wave multiplexer 10 by first paragraph the second optical fiber 2, the output of described the first wave multiplexer 10 is by being connected with the optical isolator 11 for isolating reverse transfer light for first paragraph the 3rd optical fiber 3 that is undertaken flashlight to amplify by stimulated Raman scattering amplification process, the output of described optical isolator 11 connects the band stop filter 12 of the continuous laser for filtering out the first pump laser generation by the 4th optical fiber 4, the output of described band stop filter 12 is connected with by the 5th optical fiber 5 the second wave multiplexer 14 that continuous laser for the second pump laser 13 is produced and the flashlight after amplifying are coupled, the output of described the second pump laser 13 is connected with the input of described the second wave multiplexer 14 by second segment the second optical fiber 17, second segment the 3rd optical fiber 6 that the output of described the second wave multiplexer 14 carries out gain compensation by the each unequal signal of the power for the second wave multiplexer 14 is exported connects the channel-splitting filter 15 for power output equal signal, described channel-splitting filter 15 outputs are connected with multiple optical receivers 16 by many six fiberses 7, the central wavelength lambda of any one in the different and multiple described optical senders 8 of the centre wavelength of multiple described optical senders 8 iall be greater than the central wavelength lambda of described the first pump laser 9 1Pcentral wavelength lambda with described the second pump laser 13 2P, and
Figure BDA0000454203230000051
span be 300cm -1～500cm -1,
Figure BDA0000454203230000052
span be 420cm -1～620cm -1, wherein, i is that the value of the number of channel and i is 1～N, N is flashlight sum and is integer.
The central wavelength lambda of any one in multiple described optical senders 8 described in the present embodiment icentral wavelength lambda with described the first pump laser 9 1Pmeet frequency displacement computing formula Δ v=(1/ λ 1P)-(1/ λ i), wherein, Δ v is that the span of frequency shift amount and Δ v is 300cm -1～500cm -1.
The central wavelength lambda of any one in multiple described optical sender 8 described in the present embodiment icentral wavelength lambda with the described second continuous pump laser 13 2Pmeet frequency displacement computing formula Δ v=(1/ λ 2P)-(1/ λ i), wherein, Δ v is that the span of frequency shift amount and Δ v is 420cm -1～620cm -1.
First paragraph described in the present embodiment the 3rd optical fiber 3 and second segment the 3rd optical fiber 6 are telluro highly nonlinear optical fiber, and the raman gain spectrum of described telluro highly nonlinear optical fiber is at 300cm -1～620cm -1frequency swing in normalization Raman gain coefficienct scope be 0.82 × 10 -12m/W～2.5 × 10 -12m/W.
Band stop filter 12 centre wavelengths described in the present embodiment are identical with the first pump laser 9 centre wavelengths.
Adopt the utility model to carry out the method for optical signal amplification, comprise the following steps:
Step 1, selection centre wavelength are λ 1Pthe first pump laser 9, the first pump lasers 9 export the first continuous pump light and be transferred to the first wave multiplexer 10 through first paragraph the second optical fiber 2; In the present embodiment, selection centre wavelength is λ 1Pthe first pump laser 9 that=1444.5nm, power are 1W;
Step 2, according to frequency displacement computing formula Δ v=(1/ λ 1P)-(1/ λ i) select the different optical transmitter of multiple centre wavelength 8, wherein λ ifor any one centre wavelength in multiple described optical sender devices 8, and multiple described optical transmitters 8 are exported to the different flashlight of multiple centre wavelength and through many first Optical Fiber Transmission to the first wave multiplexer 10; As Fig. 2, wherein, Δ v is that the span of frequency shift amount and Δ v is 300cm -1～500cm -1, this span in raman gain spectrum Raman gain coefficienct with frequency displacement first increases and then decreases; In the present embodiment, choosing each optical transmitter 8 transmitted signal light wavelength scopes is that 1510nm～1557nm and each wavelength interval are 1nm, and luminous power is 0.01mW;
Multiple flashlight couplings that step 3, the described first continuous pump light first paragraph the second optical fiber 2 being transmitted by the first wave multiplexer 10 and Duo Gen the first optical fiber 1 transmit are respectively input in first paragraph the 3rd optical fiber 3;
Step 4, the described first continuous pump light of inputting through the first wave multiplexer 10 and multiple flashlight are input to optical isolator 11 after multiple flashlights being amplified through stimulated raman scattering in first paragraph the 3rd optical fiber 3, then be input in band stop filter 12 through the 4th optical fiber 4, the first continuous pump light is filtered out through band stop filter 12;
Step 5, according to frequency displacement computing formula Δ v=(1/ λ 2P)-(1/ λ i) selection the second pump laser 13 centre wavelengths, wherein λ ifor any one centre wavelength in multiple described optical transmitters 8, the second pump laser 13 is exported the second continuous pump light and is passed to the second wave multiplexer 14 through second segment the second optical fiber 17, is input to second segment the 3rd optical fiber 6 with the wavelength of exporting through band stop filter 12 through the second wave multiplexer 14; In Fig. 2, Δ v is that the span of frequency shift amount and Δ v is 420cm -1～620cm -1, this span Raman gain coefficienct in raman gain spectrum increases and first reduces to increase again with frequency displacement; In the present embodiment, the second pump laser 13 centre wavelengths are 1419.9nm;
Step 6, the second continuous pump light and the multiple flashlight that are input in described second segment the 3rd optical fiber 6 through the second wave multiplexer 14 couplings carry out gain compensation through stimulated raman scattering to multiple flashlights in second segment the 3rd optical fiber 6;
Step 7, multiple flashlight are carried out amplification in various degree at the first continuous pump light producing with the first pump laser 9 through first paragraph the 3rd optical fiber, multiple flashlights carry out gain compensation through second segment the 3rd optical fiber again in the second continuous pumping producing with the second pump laser 13, make the luminous power of multiple described flashlights wait until equivalent amplification and be transferred to the second wave multiplexer 14, in the present embodiment, the length 0.34km of described first paragraph the 3rd optical fiber 3, the length of described second segment the 3rd optical fiber is 0.159km, due at the second continuous pump light different with the first continuous pumping optical wavelength from having added centre wavelength in the congener second segment of first paragraph the 3rd optical fiber 3 the 3rd optical fiber 6, change to the second pump laser 13 wavelength makes frequency swing obtain change, make in the Raman gain coefficienct to signal and first paragraph the 3rd optical fiber 3, the Raman gain coefficienct of signal to be to complementary tendency in second segment the 3rd optical fiber 6, in first paragraph the 3rd optical fiber 3 the first continuous pump light to the Raman gain coefficienct of signal the increase first increases and then decreases with frequency displacement, in second segment the 3rd optical fiber 6, the second continuous pump light first reduces to increase with the increase of frequency displacement to the Raman gain coefficienct of signal again, make to use Part I frequency swing to make to carry out Raman amplification in first paragraph the 3rd optical fiber 3, in second segment the 3rd optical fiber 6, use Part II frequency swing to make to carry out the compensating action of amplifying power, finally reach equal effect.With the Changing Pattern of the 3rd fiber lengths as shown in Figure 3, flashlight luminous power significantly converges to 5.2 × 10 to multiple flashlight luminous powers -4w to 6.3 × 10 -4between W, abscissa represents fiber lengths, and unit is km; Ordinate represents luminous power P, and unit is W;
Step 8, described channel-splitting filter 15 separate the equal flashlight of multiple luminous powers mixing, the equal flashlight of multiple luminous powers after output gain compensation.After carrying out gain compensation, a flashlight obtains final gain as shown in Figure 4, and abscissa represents signal light wavelength λ, and unit is nm; Ordinate all represents gain, and unit is dB; As can be seen from Figure 4, the final gain that each flashlight obtains after gain compensation is tending towards equal, and in the time that gain bandwidth is 48nm, average gain is 17.72dB, and gain flatness is 0.68dB.
The technical solution of the utility model is not limited to the restriction of above-mentioned specific embodiment, and every technology distortion of making according to the technical solution of the utility model, within all falling into protection range of the present utility model.

Claims (5)

1. the gain spectrum flattening Raman Fiber Amplifier based on telluro optical fiber, be connected in optical sender (8) and optical receiver (16), it is characterized in that, comprise the first pump laser (9), the first wave multiplexer (10), optical isolator (11), band stop filter (12), the second pump laser (13), the second wave multiplexer (14) and channel-splitting filter (15), described optical sender (8) and optical receiver (16) are set to multiple, the output of multiple optical senders (8) is connected with the input of the first wave multiplexer (10) by the first optical fiber (1) accordingly, the output of described the first pump laser (9) is connected with the input of the first wave multiplexer (10) by first paragraph the second optical fiber (2), the output of described the first wave multiplexer (10) is by connecting the input of optical isolator (11) for first paragraph the 3rd optical fiber (3), the output of described optical isolator (11) connects the input of band stop filter (12) by the 4th optical fiber (4), the output of described band stop filter (12) connects the input of the second wave multiplexer (14) by the 5th optical fiber (5), the output of described the second pump laser (13) is connected with the input of described the second wave multiplexer (14) by second segment the second optical fiber (17), the output of described the second wave multiplexer (14) connects the input of channel-splitting filter (15) by second segment the 3rd optical fiber (6), the corresponding many six fiberses (7) that pass through of output of described channel-splitting filter (15) are connected with the input of multiple optical receivers (16), the central wavelength lambda of any one in the different and multiple described optical senders (8) of the centre wavelength of described multiple optical sender (8) iall be greater than the central wavelength lambda of described the first pump laser (9) 1Pcentral wavelength lambda with described the second pump laser (13) 2P, and span be 300cm -1～500cm -1,
Figure FDA0000454203220000012
span be 420cm -1～620cm -1, wherein, i is that the value of the number of channel and i is 1～N, N is flashlight sum and is integer.
2. the gain spectrum flattening Raman Fiber Amplifier based on telluro optical fiber according to claim 1, is characterized in that: the central wavelength lambda of any one in described multiple optical senders (8) icentral wavelength lambda with described the first pump laser (9) 1Pmeet frequency displacement computing formula Δ v=(1/ λ 1P)-(1/ λ i), wherein, Δ v is that the span of frequency shift amount and Δ v is 300cm -1～500cm -1.
3. the gain spectrum flattening Raman Fiber Amplifier based on telluro optical fiber according to claim 1, is characterized in that: the central wavelength lambda of any one in described multiple optical senders (8) icentral wavelength lambda with described the second pump laser (13) 2Pmeet frequency displacement computing formula Δ v=(1/ λ 2P)-(1/ λ i), wherein, Δ v is that the span of frequency shift amount and Δ v is 420cm -1～620cm -1.
4. the gain spectrum flattening Raman Fiber Amplifier based on telluro optical fiber according to claim 1, it is characterized in that: described first paragraph the 3rd optical fiber (3) and second segment the 3rd optical fiber (6) are telluro highly nonlinear optical fiber, and the raman gain spectrum of described telluro highly nonlinear optical fiber is at 300cm -1～620cm -1frequency swing in normalization Raman gain coefficienct scope be 0.82 × 10 -12m/W～2.5 × 10 -12m/W.
5. the gain spectrum flattening Raman Fiber Amplifier based on telluro optical fiber according to claim 1, is characterized in that: described band stop filter (12) centre wavelength is identical with the first pump laser (9) centre wavelength.
CN201420009099.7U 2014-01-07 2014-01-07 A gain spectrum flattening Raman optical fiber amplifier based on tellurite-based optical fibers Expired - Fee Related CN203661069U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103716093A (en) * 2014-01-07 2014-04-09 西安邮电大学 Gain spectrum flat Raman fiber amplifier based on tellurium-based optical fibers
CN104639258A (en) * 2015-02-06 2015-05-20 电子科技大学 Parameter multicast photon channelized radio-frequency receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103716093A (en) * 2014-01-07 2014-04-09 西安邮电大学 Gain spectrum flat Raman fiber amplifier based on tellurium-based optical fibers
CN104639258A (en) * 2015-02-06 2015-05-20 电子科技大学 Parameter multicast photon channelized radio-frequency receiver

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