CN1398061A - All-band laman optical fibre amplifier - Google Patents
All-band laman optical fibre amplifier Download PDFInfo
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- CN1398061A CN1398061A CN02136511A CN02136511A CN1398061A CN 1398061 A CN1398061 A CN 1398061A CN 02136511 A CN02136511 A CN 02136511A CN 02136511 A CN02136511 A CN 02136511A CN 1398061 A CN1398061 A CN 1398061A
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Abstract
A full band Raman optical fiber amplifier contains five signal transmissions and five amplifierd arms and a pair of wave band demultiplexer/multiplexer. The five amplified arms transmit light signals of different wavelengths and waveband demultiplexer demultiplexes input light signals to five different wave bands amplified by a semiconductor laser pump to be outputted together. The amplified arm uses unzero dispersion shift optical fiber as the medium of transmission and gain to the distributed Raman amplifying and to the concentrated, it uses its compensation fiber. Every amplified arm applies different laser pumps of different wavelengths to reversely pump the unzero dispersion shift fibers or the compensated in the arm to amplify the transmitted light signals.
Description
Technical field:
The present invention relates to a kind of fiber amplifier, relate in particular to a kind of all band fiber amplifier, be applicable to optical fiber telecommunications system and network based on Raman effect.
Background technology:
In recent years, the user is increasing to the capacity requirement of optical fiber telecommunications system, and the number of channels of trunk dense wave division multipurpose (DWDM) optical fiber telecommunications system surpasses 80, and single channel speed strides forward to 40Gb/s, and maximum total capacity has surpassed 80 * 40Gb/s.The DWDM optical fiber telecommunications system of vast capacity and long distance not only needs multi wave length illuminating source, and needs a large amount of image intensifers.Semiconductor optical amplifier is very sensitive to polarization and temperature, job insecurity, and noise is bigger; Erbium-doped fiber amplifier (EDFA) centre wavelength near 1550nm, maximum bandwidth about 80nm, superior performance, commercialization, but along with the DWDM bandwidth constantly increases, be difficult to satisfy the broadband requirement, especially can not have satisfied the above wavelength zone requirement of 1310nm and 1620nm.Raman Fiber Amplifier has the not available advantages of other amplifier such as wide bandwidth, low noise, becomes the hot subject of optical communication in recent years gradually.Raman Fiber Amplifier has two types: a kind of is centralized raman amplifier, used fiber gain medium is shorter, generally at several kilometers, pump power requires very high, generally several to tens watts, can produce the above high-gain of 40dB, be used for flashlight is concentrated amplification as EDFA, amplify mainly as high-gain, high power, scalable EDFA the wave band that can't amplify.Another kind is a distributed raman amplifier, and used optical fiber is long, is generally tens kilometers, and pump power can be reduced to the hundreds of milliwatt, and mainly auxiliary EDFA is used for the raising of DWDM communication system performance, suppresses nonlinear effect, improves signal to noise ratio.In dwdm system, transmission capacity, the especially increase of wavelength multiplexing number makes the luminous power of transmitting in the optical fiber increasing, and the nonlinear effect that causes is also more and more stronger, is easy to generate channel interference, makes distorted signals.Adopt distributed Raman to amplify the incident power that auxiliary transmission can reduce signal greatly, keep suitable light signal signal to noise ratio simultaneously.Because the needs that system transmission capacity promotes, this distributed Raman amplifying technique is developed fast.The multi wavelength pumping method is a promising method for pumping of realizing that Wideband Raman amplifies, it directly uses multiplexer together multiplexing the wavelength of a plurality of single mode semiconductor pump lasers, its advantage one is owing to multiplexing a plurality of wavelength provide a very wide gain spectral, the 2nd, and can be by the convenient gain slope of adjusting of the power of adjusting single laser.
Amplify bandwidth in order to improve Raman, KidorfHoward David (the US6052219 of U.S. TYCO SUBMARINE SYSTEM company, Wide bandwidth Raman amplifier capable of employingpump energy spectrally overlapping the signal) and Xiabing Ma (US6151160, Broadband Raman pre-amplifier for wavelength division multiplexed opticalcommunication systems) this is successively studied.The former adopts 1455nm and two pumping source backward pumpings of 1495nm, the signal that can obtain 1530-1610nm scope (C-band and L-band) amplifies, the latter proposes to adopt a plurality of minutes band structures, each divides band to amplify pairing light signal with rare-earth ion-doped optical fiber or Raman effect, can realize the broadband amplification, because the latter is before a minute band amplifies, an erbium-doped fiber amplifier or Raman Fiber Amplifier have also been utilized, its bandwidth of dividing band to amplify is subjected to the restriction of the amplifier of its front, and it amplifies bandwidth and is no more than 120nm.
Along with the day by day demand of user to bandwidth, optical fiber communication develops towards the direction of two-forty and high bandwidth, and the silica fiber at anhydrous peak is succeeded in developing (ALLWAVE optical fiber), will put it into commercial operation soon.The low-loss bandwidth of the silica fiber at anhydrous peak is 400nm (1250-1650nm), covered second, third, the 4th and the 5th communication window.Yet the maximally-flat bandwidth of the fiber amplifier of invention has only 120nm at present, and its bandwidth is less than all-wave fiber can utilize 1/3rd of bandwidth.Therefore, the wideer super-broadband fiber amplifier of research bandwidth becomes the research theme of recent close wavelength-division multiplex technology.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, propose a kind of all-band laman optical fibre amplifier, make it to have wideer transmission bandwidth, more adapt to the transmission requirement of all-wave fiber communication system.
For realizing such purpose, in the technical scheme of the present invention, utilize the method for dividing band structure and multi wavelength pumping to combine, adopt non-zero dispersion displacement optical fiber and dispersion compensating fiber respectively, design the distributed and centralized Raman Fiber Amplifier of all band of 400nm bandwidth.
The all-band laman optical fibre amplifier of the present invention's design comprises five signal transmission and amplifies arm and a pair of wavestrip demodulation multiplexer/multiplexer.Five are amplified arm and are respectively applied for transmission and amplify the light signal of 1250-1310nm, 1310-1380nm, 1380-1460nm, 1460-1550nm and 1550-1650nm wave-length coverage.Wavestrip demodulation multiplexer/multiplexer is used for the input optical signal of 1250-1650nm scope is demultiplexed into above-mentioned five different wavestrips.
Amplify for distributed Raman, be provided with five overall parallel amplification arms, five are amplified arm and use non-zero dispersion displacement optical fiber (NDSF) to make transmission and gain media.Use will demultiplex into five wavestrip (1250-1310nm from the light signal of the 1250-1650nm wave band of input based on the wavestrip demodulation multiplexer of band pass filter, 1310-1380nm, 1380-1460nm, 1460-1550nm, 1550-1650nm), after the amplification of non-zero dispersion displacement optical fiber backward pumping, close ripple output by the wavestrip multiplexer.
Amplify for centralized Raman, be provided with five overall parallel amplifier arms, five are amplified arm and use dispersion compensating fiber (DCF) to make transmission and gain media.Use will demultiplex into five wavestrip (1250-1310nm from the light signal of the 1250-1650nm wave band of input based on the wavestrip demodulation multiplexer of band pass filter, 1310-1380nm, 1380-1460nm, 1460-1550nm, 1550-1650nm), after the amplification of dispersion compensating fiber backward pumping, close ripple output by the wavestrip multiplexer.
Each amplifies the laser pumping that arm adopts several emission wavelengths not wait respectively, the non-zero dispersion displacement optical fiber that is used for this arm of pumping, amplify the wherein light signal of transmission so that distribute, or the pumping dispersion compensating fiber, the wherein light signal of transmission amplified so that concentrate.
The bandwidth of all-band laman optical fibre amplifier of the present invention can reach 400nm, covers all low-loss communication windows of all-wave fiber.In the all-wave fiber communication system, can make full use of the effective bandwidth of all-wave fiber.
Description of drawings:
Fig. 1 is the structural representation of all band distributed Raman fiber amplifier of the present invention.
As shown in Figure 1, all band distributed Raman fiber amplifier of the present invention is provided with five overall parallel signal transmission and amplifies arm, be respectively applied for the light signal of five different wavelength range of transmission, five arms adopt non-zero dispersion displacement optical fiber to make transmission and gain media.The multi wavelength pumping diode laser matrix connects and the pumping non-zero dispersion displacement optical fiber.Wavestrip demodulation multiplexer based on band pass filter demultiplexes into five wavestrips with the all-wave fiber signal of importing, and each wavestrip is closed ripple output through the wavestrip multiplexer after being amplified by the non-zero dispersion displacement optical fiber transmission.
Fig. 2 is the structural representation of the centralized Raman Fiber Amplifier of all band of the present invention.
As shown in Figure 2, the centralized Raman Fiber Amplifier of all band of the present invention is provided with five overall parallel signal transmission and amplifies arm, is respectively applied for the light signal of five different wavelength range of transmission, and five arms adopt dispersion compensating fiber to make transmission and gain media.The multi wavelength pumping diode laser matrix connects and the pumping dispersion compensating fiber.Wavestrip demodulation multiplexer based on band pass filter demultiplexes into five wavestrips with the all-wave fiber signal of importing, and each wavestrip is closed ripple output through the wavestrip multiplexer after being amplified by the dispersion compensating fiber transmission.
Embodiment: 1. distributed Raman amplifies
All-band laman optical fibre amplifier in the present embodiment comprises five signal transmission and amplifies arm, first amplifies the ultrashort wavelength signals that arm is used to transmit the 1250-1310nm wave-length coverage, second is amplified short wavelength's signal that arm is used to transmit the 1310-1380nm wave-length coverage, the 3rd short wavelength's signal that is used to transmit the 1380-1460nm wave-length coverage, the 4th signal that is used to transmit the 1460-1550nm wave-length coverage, the 5th signal that is used to transmit the 1550-1650nm wave-length coverage, use the long non-zero dispersion displacement optical fiber (NDSF) of 25km to make transmission and gain media, the non-zero dispersion displacement optical fiber parameter is as shown in table 1, and distributing rationally of pumping wavelength that is used to amplify and pump power is as shown in table 2.
Table 1 is used for the non-zero dispersion displacement optical fiber parameter that distributed Raman amplifies
In the table, β
1, β
2: 1st order chromatic dispersion and 2nd order chromatic dispersion; D
1, D
2: the first derivative of chromatic dispersion and second dervative;
| The loss of 1550nm place | ?β 1，β 2 | D 1，D 2 | ?λ 0 | ?PMD | ??A | L |
| ??0.2dB | ?2.55ps 2/km ?，0.11ps 3/km | -2ps/nm/km， 0.07ps/nm 2/km | ?1580.0nm | ?0.1pskm 1/2 | ??55μm 2 | 25km |
λ
0: zero-dispersion wavelength; PMD: polarization mode dispersion; A: fibre core effective area; L: fiber lengths
Table 2 is used for the pumping wavelength of distributed Raman amplification and distributing rationally of pump power
| Input signal wave-length coverage (nm) | Pumping wavelength of distributing rationally and pump power | |||||||
| ?1250-1310 | Wavelength (nm) | 1184.4 | ?1212.1 | ?1241.2 | ||||
| Power (mW) | 487.54 | ?154.79 | ?77.17 | |||||
| ?1310-1380 | Wavelength (nm) | 1237.1 | ?1268.5 | ?1298.1 | ?1307.2 | |||
| Power (mW) | 534.09 | ?153.65 | ?23.304 | ?38.271 | ||||
| ?1380-1460 | Wavelength (nm) | 1300.4 | ?1336.4 | ?1373.1 | ||||
| Power (mW) | 559.8 | ?162.56 | ?77.352 | |||||
| ?1460-1550 | Wavelength (nm) | 1371.2 | ?1409.9 | ?1452.3 | ||||
| Power (mW) | 585.86 | ?176.49 | ?82.218 | |||||
| ?1550-1650 | Wavelength (nm) | 1450.3 | ?1493.7 | ?1539.7 | ||||
| Power (mW) | 620.49 | ?191.4 | ?83.46 | |||||
Each input channel power is-20dBm that channel separation is 1.6nm.First transmission and amplification arm are respectively 1184.4nm with wavelength, 1212.1nm, and 1241.2nm, gross power are 3 diode-end-pumpeds of 720mW, the wavelength of optical signal scope is 1250-1310nm, the smooth bandwidth of gained is 60nm, and average gain is about 10dB, and flatness is in 1dB.Second transmits and amplify the arm wavelength is 1237.1nm, 1268.5nm, 1298.1nm, 1307.2nm, gross power is 4 diode-end-pumpeds of 744mW, wavelength of optical signal scope 1310-1380nm, the smooth bandwidth of gained is 70nm, average gain is about 10dB, and flatness is in 1dB.The 3rd transmits and amplify the arm gross power is that 798mW, emission wavelength are 1300.4nm, 1336.4nm, 1373.1nm 3 diode-end-pumpeds, the wave-length coverage of light signal is 1380-1460nm, the smooth bandwidth of gained is 80nm, average gain is about 10dB, and its flatness is in 1dB.The 4th transmits and amplify the arm gross power is that 855mW, emission wavelength are 1371.2nm, 1409.9nm, 1452.3nm 3 diode-end-pumpeds, the wave-length coverage of light signal is 1460-1550nm, the smooth bandwidth of gained is 90nm, average gain is about 10dB, and its flatness is in 1dB.The 5th transmits and amplify the arm gross power is that 896mW, emission wavelength are 1450.3nm, 1493.7nm, 3 diode-end-pumpeds of 1539.7nm, the wavelength of optical signal scope is 1550-1650nm, the smooth bandwidth of gained is 100nm, and average gain is about 10dB, and its flatness is in 1dB.After above five transmission and amplifying arm, the gain spectrum flattening bandwidth of exporting from the coupling of wavestrip multiplexer can reach 400nm.
Therefore the smooth bandwidth of all-band laman optical fibre amplifier of the present invention can reach the 400nm bandwidth, and the wave-length coverage of covering is 1250-1650nm.2. centralized Raman amplifies
All-band laman optical fibre amplifier in the present embodiment comprises five signal transmission and amplifies arm, first amplifies the ultrashort wavelength signals that arm is used to transmit the 1250-1310nm wave-length coverage, second is amplified short wavelength's signal that arm is used to transmit the 1310-1380nm wave-length coverage, the 3rd short wavelength's signal that is used to transmit the 1380-1460nm wave-length coverage, the 4th signal that is used to transmit the 1460-1550nm wave-length coverage, the 5th signal that is used to transmit the 1550-1650nm wave-length coverage, use the long dispersion compensating fiber (DCF) of 1km to make transmission and gain media, parameter is as shown in table 3.It is as shown in table 4 to be used for distributing rationally of pumping wavelength that centralized Raman amplifies and pump power.
Table 3 is used for the dispersion compensating fiber parameter that centralized Raman amplifies
In the table, β
1, β
2: 1st order chromatic dispersion and 2nd order chromatic dispersion; D
1, D
2: the first derivative of chromatic dispersion and second dervative;
| The loss of 1550nm place | ?β 1，β 2 | ??D 1，D 2 | ?λ 0 | ?PMD | ??A | L |
| 0.55dB | ?102.03ps 2/km ?，0.14ps 3/km | ??-80ps/nm/km， ??0.19ps/nm 2/km | ?3825.0nm | ?0.1pskm 1/2 | ??20μm 2 | 20km |
λ
0: zero-dispersion wavelength; PMD: polarization mode dispersion; A: fibre core effective area; L: fiber lengths
Table 4 is used for the pumping wavelength of centralized Raman amplification and distributing rationally of pump power
| Input signal wave-length coverage (nm) | Pumping wavelength of distributing rationally and pump power | |||||||
| 1250-1310 | Wavelength (nm) | 1161.4 | ?1162.3 | ?1163.2 | ?1164.1 | ?1165 | ?1206.3 | ?1239.2 |
| Power (mW) | 682.16 | ?682.16 | ?682.16 | ?682.16 | ?682.16 | ?225.72 | ?146.21 | |
| 1310-1380 | Wavelength (nm) | 1235.0 | ?1237.1 | ?1239.1 | ?1268.5 | ?1301.5 | ||
| Power (mW) | 688.35 | ?688.35 | ?688.35 | ?710.83 | ?295.44 | |||
| 1380-1460 | Wavelength (nm) | 1298.2 | ?1300.4 | ?1302.7 | ?1336.4 | ?1373.1 | ||
| Power (mW) | 753.19 | ?753.19 | ?753.19 | ?713.67 | ?303.59 | |||
| 1460-1550 | Wavelength (nm) | 1339.4 | ?1340.6 | ?1341.8 | ??1343 | ?1386.4 | ?1413.9 | ?1452.3 |
| Power (mW) | 772.41 | ?772.41 | ?772.41 | ?772.41 | ?736.18 | ?144.44 | ?282.58 | |
| 1550-1650 | Wavelength (nm) | 1448.9 | ?1450.3 | ?1451.7 | ?1453.1 | ?1495.2 | ?1541.3 | |
| Power (mW) | 651.24 | ?651.24 | ?651.24 | ?651.24 | ?716.58 | ?346.06 | ||
Each input channel power is-20dBm that channel separation is 1.6nm.First transmission and amplification arm are respectively 1161.4nm with wavelength, 1162.3nm, 1163.2nm, 1164.1nm, 1165.0nm, 1206.3nm and 1239.2nm, gross power are 7 diode-end-pumpeds of 3782mW, the wavelength of optical signal scope is 1250-1310nm, the smooth bandwidth of gained is 60nm, and average gain is about 10dB, and flatness is in 1dB.Second transmits and amplifies arm 1235.0nm, 1237.1nm, and 1239.1nm, 126 8.5nm, 1301.5nm, gross power are 5 diode-end-pumpeds of 3071mW, and the smooth bandwidth of gained is 70nm, and average gain is about 10dB, and flatness is in 1dB.The 3rd transmits and amplify the arm gross power is that 3276mW, emission wavelength are 1298.2nm, 1300.4nm, 1302.7nm, 1336.4nm, 5 diode-end-pumpeds of 1373.1nm, the smooth bandwidth of gained is 80nm, average gain is about 10dB, and its flatness is in 1dB.The 4th transmits and amplify the arm gross power is that 4252mW, emission wavelength are 1339.4nm, 1340.6nm, 1341.8nm, 1343nm, 1386.4nm, 1413.9nm, 1452.3nm 7 diode-end-pumpeds, the smooth bandwidth of gained is 90nm, and average gain is about 10dB, and its flatness is in 1dB.The 5th transmission and amplify arm with being that 3668mW, emission wavelength are 1448.9nm with gross power, 1450.3nm, 1451.7nm, 1453.1nm, 1495.2nm, 6 diode-end-pumpeds of 154 1.3nm, the smooth bandwidth of gained is 100nm, average gain is about 10dB, and its flatness is in 1dB.After above five transmission and amplifying arm, the gain spectrum flattening bandwidth of exporting from the coupling of wavestrip multiplexer can reach 400nm.
Therefore the smooth bandwidth of all-band laman optical fibre amplifier can reach the 400nm bandwidth, and the wave-length coverage of covering is 1250-1650nm.
Claims (5)
1, a kind of all-band laman optical fibre amplifier, it is characterized in that comprising five signal transmission and amplify arm and a pair of wavestrip demodulation multiplexer/multiplexer, five amplification arms transmit and amplify the light signal of 1250-1310nm, 1310-1380nm, 1380-1460nm, 1460-1550nm and 1550-1650nm wave-length coverage respectively, and the wavestrip demodulation multiplexer demultiplexes into above-mentioned five different wavestrips with the input optical signal of 1250-1650nm scope.Each wavestrip is closed ripple output by the wavestrip multiplexer after diode-end-pumped amplifies.
2, as the said all-band laman optical fibre amplifier of claim 1, it is characterized in that amplifying for distributed Raman, five overall parallel signals transmit and amplification arm use non-zero dispersion displacement optical fiber do transmission and gain media.
3, as the said all-band laman optical fibre amplifier of claim 1, it is characterized in that amplifying for centralized Raman, five overall parallel signals transmit and do transmission of amplifier arm use dispersion compensating fiber and gain media.
4,, it is characterized in that the non-zero dispersion displacement optical fibers of five amplification arms are used 3,4,3,3,3 diode-end-pumpeds that emission wavelength does not wait respectively as the said all-band laman optical fibre amplifier of claim 2.
5,, it is characterized in that the dispersion compensating fibers of five amplification arms are used 7,5,5,7,6 diode-end-pumpeds that emission wavelength does not wait respectively as the said all-band laman optical fibre amplifier of claim 3.
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| CNB021365113A CN1190914C (en) | 2002-08-15 | 2002-08-15 | All-band Laman optical fibre amplifier |
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| CNB021365113A CN1190914C (en) | 2002-08-15 | 2002-08-15 | All-band Laman optical fibre amplifier |
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| CN1190914C CN1190914C (en) | 2005-02-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044837A (en) * | 2019-04-11 | 2019-07-23 | 南京安控易创计算机科技有限公司 | A kind of difference absorption spectrum gas-detecting device based on fiber amplifier |
| CN112611726A (en) * | 2020-12-23 | 2021-04-06 | 陈政 | Molecular characteristic absorption spectrum measuring device and method |
-
2002
- 2002-08-15 CN CNB021365113A patent/CN1190914C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044837A (en) * | 2019-04-11 | 2019-07-23 | 南京安控易创计算机科技有限公司 | A kind of difference absorption spectrum gas-detecting device based on fiber amplifier |
| CN110044837B (en) * | 2019-04-11 | 2021-10-15 | 南京安控易创计算机科技有限公司 | Differential absorption spectrum gas detection device based on optical fiber amplifier |
| CN112611726A (en) * | 2020-12-23 | 2021-04-06 | 陈政 | Molecular characteristic absorption spectrum measuring device and method |
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| CN1190914C (en) | 2005-02-23 |
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