CN107533270B - Raman amplification light source, Raman amplification light source system, Raman amplifier, and Raman amplification system - Google Patents

Raman amplification light source, Raman amplification light source system, Raman amplifier, and Raman amplification system Download PDF

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CN107533270B
CN107533270B CN201680022816.1A CN201680022816A CN107533270B CN 107533270 B CN107533270 B CN 107533270B CN 201680022816 A CN201680022816 A CN 201680022816A CN 107533270 B CN107533270 B CN 107533270B
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raman
incoherent
light source
raman amplification
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大越春喜
森本政仁
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Furukawa Electric Co Ltd
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    • H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
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    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
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    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094096—Multi-wavelength pumping
    • H—ELECTRICITY
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    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping

Abstract

A Raman amplification light source for Raman-amplifying a signal light transmitted through an optical transmission fiber, comprising: a plurality of incoherent light sources that output incoherent light; a plurality of excitation light sources that output second-order excitation light having a wavelength at which the incoherent light is raman-amplified; a raman amplification optical fiber connected to the plurality of incoherent light sources and the plurality of excitation light sources, for raman-amplifying the incoherent light by the second-order excitation light and outputting the amplified incoherent light; and an output unit connected to the optical transmission fiber, to which incoherent amplification light raman-amplified by the raman amplification optical fiber is input, and which outputs the incoherent amplification light as first-order excitation light having a wavelength at which the signal light is raman-amplified to the optical transmission fiber.

Description

Raman amplification light source, Raman amplification light source system, Raman amplifier, and Raman amplification system
Technical Field
The present invention relates to a raman amplification light source, a raman amplification light source system, a raman amplifier, and a raman amplification system.
Background
Conventionally, in optical fiber communication, an erbium-doped fiber amplifier (EDFA) has been used to extend a transmission distance and a transmission capacity. However, at present, it is essential to use not only EDFA but also raman amplification, and to efficiently combine both. Currently, as raman amplification, backward excitation raman amplification is mainly used in which excitation light is incident on an optical fiber for raman amplification so as to propagate in a direction opposite to the propagation direction of signal light. However, in order to achieve higher speed (100Gb/S), long distance (100km transmission), and broadband (effective use of L, S-band) for the next generation, it is essential to use both a mode in which excitation light enters a raman amplification optical fiber so as to propagate in the same direction as the propagation direction of signal light, which is called forward excitation raman amplification, and backward excitation raman amplification. This approach is called two-way stimulated raman amplification. Further, it has been reported that, by using the wavelength division multiplexing excitation method, although it is possible to achieve flattening of the raman gain and widening of the band by only backward excitation raman amplification, it is impossible to achieve flattening of the Noise Figure (NF) without using the bidirectional excitation raman amplification (non-patent documents 1 and 2).
Here, it is explained why an incoherent (incoherent) excitation light source for forward-excited raman amplification is newly required in addition to a 14XXnm band semiconductor laser module (LDM) which has been widely used as an excitation light source for EDFAs. The main characteristics necessary for raman amplification, particularly forward excitation raman amplification, are listed below.
(1) Low RIN transfer (Relative Intensity Noise)
(2) Low SBS (Stimulated Brillouin Scattering)
(3) Low non-linear effect
In addition, in order to cope with the current wide band wavelength division multiplexing transmission (DWDM transmission),
(4) it is necessary to control the amplification gain in a wide wavelength range to perform optical amplification.
RIN is an index obtained by normalizing a minute intensity fluctuation component of laser light with respect to the total light output. The phenomenon of raman amplification is due to the short lifetime of the excitation level that produces the gain: (
Figure BDA0001438733920000021
Several fsec), if there is intensity noise in the excitation light source, the intensity noise directly becomes noise of the signal light through the amplification process. EDFA has a long life due to the excitation level (
Figure BDA0001438733920000022
10msec) so there is no such concern. For Raman amplification, PingThe gain per unit length is very small compared to the EDFA, but in forward excitation raman amplification, since the signal light and the excitation light travel together in the optical fiber over a long distance, the noise of the excitation light is slowly converted into the noise of the signal light. This is called RIN transfer. In the backward excitation raman amplification, since the signal light is opposed to the excitation light, the time during which the excitation light having a certain noise component and the signal light intersect is short, and the noise of the excitation light has less influence on the signal light. Further, since the noise of the excitation light is random, even if the signal light is affected, it is averaged in the process of relative advancing. As described above, forward raman amplification requires a characteristic of low RIN transition, and particularly, it is important to reduce this RIN transition in a Dispersion Shifted Fiber (DSF) or the like in which the group velocity difference between signal light and excitation light is small and the time for which the signal light and the excitation light travel in parallel in the fiber is long.
SBS is one of the third-order nonlinear optical effects, a phenomenon in which a part of light is scattered backward due to acoustic phonons generated by light excitation in an optical fiber. When SBS occurs, the excitation light is not preferable because it scatters backward and does not contribute to raman amplification effectively. Generally, if the total light output intensity is the same, SBS is easily generated in the excitation light source that oscillates in a single mode and outputs laser light having a narrow line width, and therefore, SBS can be suppressed without reducing raman gain in the excitation light source that oscillates in the number of longitudinal modes and reduces the light output in each longitudinal mode. SBS can be suppressed more effectively if the light source oscillates in a continuous longitudinal mode and has a wider spectral width.
The nonlinear effect causes distortion of the signal light, which degrades the communication quality, and therefore must be avoided. The current optical communication is generally wavelength division multiplexing communication, and even if the power (power) of signal light of one wavelength is small, the entire power increases by multiplexing. For example, even if the power of the signal light of each wavelength is 1mW, the total power becomes 100mW when the 100-wave multiplexing is performed. When signal light is optically amplified to compensate for loss in a transmission line, if the signal light is amplified at a certain position by a lumped constant type amplifier such as EDFA, the power of the amplified signal light is introduced into the transmission line at a time, and thus a nonlinear effect is likely to occur. To avoid this, it is advantageous to gradually perform amplification with various distributed constant type amplifiers of raman amplification. However, in forward raman amplification, the raman amplification gain exceeds the transmission loss of the optical fiber as a transmission line on the incident side of the transmission line, and the power of the signal light in this portion of the optical fiber is larger than the power at the incident end of the signal light, which tends to cause a nonlinear effect. In order to avoid this, high-order raman amplification has been studied in which raman amplification is repeated in cascade to a wavelength that can be used as the excitation light of the signal light. For example, it is a principle that excitation light having a wavelength of about 1450nm is used to raman-amplify signal light in the 1550nm band, but in this case, excitation light having a wavelength of about 1350nm is used to raman-amplify excitation light at 1450nm, and the raman-amplified excitation light at 1450nm is used to raman-amplify signal light in the 1550nm band. As a result, at the incident end of the transmission path, the power of 1450nm excitation light for raman-amplifying the signal light is small, and therefore the raman gain of the signal light in the 1550nm band is small, and as the signal light is transmitted, the 1450nm excitation light is amplified by the 1350nm excitation light, and the raman gain of the signal light in the 1550nm band becomes large. Thus, when viewed as the entire transmission line, the loss and the raman gain of the transmission line are well cancelled, and the transmission line can be regarded as a transmission line as if the transmission loss of the optical fiber is 0, and the nonlinear effect can be further reduced. In this case, 1450nm excitation light is referred to as first-order excitation light, 1350nm excitation light is referred to as second-order excitation light, and the system is referred to as a second-order excitation system. Based on the same principle, high-order raman excitation systems such as the third order and the fourth order have been studied, but even such high-order raman excitation systems require low RIN transition and low SBS for high-quality transmission.
In order to solve the above 4 problems, various techniques have been disclosed (non-patent documents 3 and 4, and patent documents 1 to 4).
Prior art documents
Patent document
Patent document 1: japanese patent No. 3676167
Patent document 2: specification of U.S. Pat. No. 07190861
Patent document 3: specification of U.S. Pat. No. 07215836
Patent document 4: specification of U.S. Pat. No. 07233431
Non-patent document
Non-patent document 1: s.kado, y.emori, s.namiki, n.tsukiji, j.yoshida, and t.kimura: ECOC' 01(2001), PD Paper 1.8.
Non-patent document 2: jiansen, door, and wood: "noise index spectrum design of Raman amplifier based on two-way excitation method" ancient river electrotechnical Times, No. 111 (2003), page 10
Non-patent document 3: development of excitation light source for forward excitation Raman amplification, ancient river electrotechnical time, 7 months 2003, No.112, pages 5-10
Non-patent document 4: kafin Keita, Philippie Delaye, Robert Fray and Gerald Roosen, "Relative sensitivity noise transfer of large-bandwidth pump lasers in Raman fiber," Journal of Optical Society America B, Vol.23, No.12, pp.2479-2485, December 2006.
Disclosure of Invention
Problems to be solved by the invention
However, the raman amplification light source system, the raman amplifier, and the raman amplification system that can simultaneously solve the above 4 problems have not achieved characteristics to a practical extent.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a raman amplification light source, a raman amplification light source system, a raman amplifier, and a raman amplification system that can simultaneously solve 4 problems.
Means for solving the problems
In order to solve the above-described problems and achieve the object, a raman amplification light source according to one aspect of the present invention is a raman amplification light source for raman-amplifying signal light transmitted through an optical transmission fiber by a stimulated raman scattering phenomenon in the optical transmission fiber, the raman amplification light source including: a plurality of incoherent light sources outputting incoherent light; a plurality of excitation light sources that output second-order excitation light having a wavelength at which the incoherent light is raman-amplified; a raman amplification optical fiber connected to the plurality of incoherent light sources and the plurality of excitation light sources, for raman-amplifying the input incoherent light with the input second-order excitation light and outputting the amplified incoherent light; and an output unit that is connected to the optical transmission fiber, receives the incoherent amplification light raman-amplified by the raman amplification optical fiber, and outputs the incoherent amplification light to the optical transmission fiber as first-order excitation light having a wavelength at which the signal light is raman-amplified.
In a raman amplification light source according to an aspect of the present invention, the plurality of incoherent light sources and the plurality of excitation light sources are connected to the raman amplification optical fiber such that the second-order excitation light forward-excites the incoherent light.
In a raman amplification light source according to an aspect of the present invention, the plurality of incoherent light sources and the plurality of excitation light sources are connected to the raman amplification optical fiber such that the second-order excitation light backward excites the incoherent light.
In the raman amplification light source according to one aspect of the present invention, the output unit is connected to the optical transmission fiber so that the first-order excitation light excites the signal light in a forward direction.
In the raman amplification light source according to one aspect of the present invention, the output unit is connected to the optical transmission fiber so that the first-order excitation light backward excites the signal light.
A raman amplification light source according to an aspect of the present invention is a raman amplification light source for raman-amplifying signal light transmitted through an optical transmission fiber, the raman amplification light source including: a plurality of incoherent light sources outputting incoherent light; a plurality of excitation light sources that output second-order excitation light having a wavelength at which the incoherent light is raman-amplified; and an output unit that is connected to the plurality of incoherent light sources, the plurality of excitation light sources, and the optical transmission fiber, and outputs the incoherent light and the second-order excitation light that have been input so as to propagate in the same direction through the optical transmission fiber, wherein the first-order excitation light having a wavelength at which the signal light is raman-amplified is generated in the optical transmission fiber by raman-amplifying the incoherent light that has been input with the second-order excitation light that has been input.
A raman amplification light source according to an aspect of the present invention includes: and an excitation light source that outputs excitation light having a wavelength at which second-order excitation light output from at least one of the plurality of excitation light sources is raman-amplified.
In a raman amplification light source according to an aspect of the present invention, the plurality of incoherent light sources include at least one of a super luminescent diode, a semiconductor optical amplifier, and an amplified spontaneous emission light source including a rare earth-doped fiber.
In a raman amplification light source according to an aspect of the present invention, the plurality of incoherent light sources include an incoherent light source that includes a superluminescent diode and a semiconductor optical amplifier and is configured to optically amplify and output incoherent light output from the superluminescent diode by the semiconductor optical amplifier.
In a raman amplification light source according to an aspect of the present invention, the plurality of incoherent light sources include an incoherent light source configured by connecting a plurality of semiconductor optical amplifiers in a multistage manner.
A raman amplification light source according to an aspect of the present invention is characterized in that the plurality of excitation light sources include at least one of a fabry-perot type semiconductor laser, a fabry-perot-fiber bragg grating type semiconductor laser in which a fabry-perot type and a fiber bragg grating are combined, a distributed feedback type semiconductor laser, and a distributed bragg reflection type semiconductor laser.
In a raman amplification light source according to an aspect of the present invention, the plurality of incoherent light sources include incoherent light sources that output incoherent light beams of mutually different wavelength bands.
A raman amplification light source system according to an aspect of the present invention includes a raman amplification light source according to an aspect of the present invention and a raman amplification light source according to an aspect of the present invention, and an output unit of each raman amplification light source is connected to the optical transmission fiber so that the first-order excitation light bidirectionally excites the signal light.
A raman amplification light source system according to an aspect of the present invention includes two raman amplification light sources according to an aspect of the present invention, and an output unit of each of the raman amplification light sources is connected to the optical transmission fiber so that the first-order excitation light bidirectionally excites the signal light.
A raman amplification light source system according to an aspect of the present invention is a raman amplification light source system for raman-amplifying signal light transmitted through an optical transmission fiber, the raman amplification light source system including: the 1 st light source unit includes: a1 st output unit which outputs the incoherent light, and which is connected to the 1 st incoherent light source and the optical transmission fiber, and outputs the incoherent light to the optical transmission fiber; and a 2 nd light source unit including: and a second-order output unit connected to the first-order excitation light source and the optical transmission fiber, the second-order excitation light being output to the optical transmission fiber, the first-order output unit and the second-order output unit being connected to the optical transmission fiber such that the incoherent light and the second-order excitation light propagate in opposite directions through the optical transmission fiber between the first-order output unit and the second-order output unit, the input incoherent light being raman-amplified by the input second-order excitation light in the optical transmission fiber between the first-order output unit and the second-order output unit, and first-order excitation light having a wavelength at which the signal light is raman-amplified being generated.
A raman amplification light source system according to an aspect of the present invention is characterized in that the 2 nd light source unit includes a plurality of 2 nd incoherent light sources that output a 2 nd incoherent light having a wavelength at which raman amplification is performed by the second order excitation light, the 1 st light source unit includes a plurality of 2 nd excitation light sources that output a 2 nd order excitation light having a wavelength at which the 2 nd incoherent light is raman-amplified, the 2 nd output unit of the 2 nd light source unit is connected to the plurality of 2 nd incoherent light sources and outputs the 2 nd incoherent light to the optical transmission fiber, the 1 st output unit of the 1 st light source unit is connected to the plurality of 2 nd excitation light sources and outputs the 2 nd order excitation light to the optical transmission fiber, and the 1 st output unit and the 2 nd output unit are connected to the optical transmission fiber, the 2 nd incoherent light and the 2 nd order excitation light are caused to propagate in opposite directions in the optical transmission fiber between the 1 st output unit and the 2 nd output unit, and the 2 nd incoherent light input is raman-amplified by the 2 nd order excitation light input in the optical transmission fiber between the 1 st output unit and the 2 nd output unit, thereby generating 2 nd order excitation light having a wavelength at which the signal light is raman-amplified.
In a raman amplification light source system according to an aspect of the present invention, the plurality of incoherent light sources include at least one of a super luminescent diode, a semiconductor optical amplifier, and an amplified spontaneous emission light source including a rare earth-doped fiber.
In the raman amplification light source system according to one aspect of the present invention, the plurality of incoherent light sources include an incoherent light source that includes a superluminescent diode and a semiconductor optical amplifier and is configured to optically amplify and output incoherent light output from the superluminescent diode by the semiconductor optical amplifier.
In a raman amplification light source system according to an aspect of the present invention, the plurality of incoherent light sources include an incoherent light source configured by connecting a plurality of semiconductor optical amplifiers in a multistage manner.
A raman amplification light source system according to an aspect of the present invention is characterized in that the plurality of excitation light sources include at least one of fabry-perot type semiconductor lasers having different wavelengths, fabry-perot-fiber bragg grating type semiconductor lasers having a fabry-perot type and a fiber bragg grating combined, distributed feedback type semiconductor lasers, and distributed bragg reflection type semiconductor lasers.
In a raman amplification light source system according to an aspect of the present invention, the plurality of incoherent light sources include incoherent light sources that output incoherent light beams of mutually different wavelength bands.
A raman amplifier according to an aspect of the present invention includes: a raman amplification light source or raman amplification light source system according to an embodiment of the present invention, and the optical transmission fiber.
A raman amplification system according to an aspect of the present invention includes: a raman amplification light source or raman amplification light source system according to an embodiment of the present invention, and the optical transmission fiber.
Effects of the invention
According to the present invention, there is obtained an effect that a raman amplification light source, a raman amplification light source system, a raman amplifier, and a raman amplification system capable of simultaneously solving 4 problems can be realized.
Drawings
Fig. 1 is a schematic configuration diagram of a raman amplification system using a raman amplification light source according to embodiment 1.
Fig. 2 is a diagram showing an example of the structure of the WDM coupler.
Fig. 3 is a diagram showing another example of the structure of the WDM coupler.
Fig. 4 is a diagram showing an example of arrangement of the wavelengths of the incoherent light and the second-order excitation light.
Fig. 5 is a schematic configuration diagram of a raman amplification system using the raman amplification light source according to embodiment 2.
Fig. 6 is a schematic configuration diagram of a raman amplification system using the raman amplification light source according to embodiment 3.
Fig. 7 is a schematic configuration diagram of a raman amplification system using the raman amplification light source according to embodiment 4.
Fig. 8 is a schematic configuration diagram of a raman amplification system using the raman amplification light source according to embodiment 5.
Fig. 9 is a schematic configuration diagram of a raman amplification system using the raman amplification light source according to embodiment 6.
Fig. 10 is a schematic configuration diagram of a raman amplification system using the raman amplification light source system according to embodiment 7.
Fig. 11 is a schematic configuration diagram of a raman amplification system using the raman amplification light source system according to embodiment 8.
Fig. 12 is a schematic configuration diagram of a raman amplification system using the raman amplification light source system according to embodiment 9.
Fig. 13 is a schematic configuration diagram of a raman amplification system using the raman amplification light source system according to embodiment 10.
Fig. 14 is a diagram showing an example of the configuration of an incoherent light source.
Detailed Description
Hereinafter, embodiments of a raman amplification light source, a raman amplification light source system, a raman amplifier, and a raman amplification system according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to these embodiments. In the drawings, the same or corresponding elements are denoted by the same reference numerals as appropriate.
(embodiment mode 1)
Fig. 1 is a schematic configuration diagram of a raman amplification system using a raman amplification light source according to embodiment 1. As shown in fig. 1, the raman amplification system 100 is applied to an optical transmission system 1000, and the optical transmission system 1000 includes: a transmitter 1001 for transmitting signal light S1, which is WDM signal light in a 1.55 μm wavelength band; an optical transmission fiber 1002 as a transmission path for transmitting the signal light S1; and a receiver 1003 that receives the signal light S1. The raman amplification system 100 includes a raman amplification light source 10 and an optical transmission fiber 1002. The raman amplification system 100 according to embodiment 1 and the raman amplification systems according to the respective embodiments described below are also configured as raman amplifiers.
The raman amplification light source 10 includes: a plurality of incoherent light sources 11, a plurality of excitation light sources 12, a WDM coupler 13, a raman amplification optical fiber 14, and a WDM coupler 15 as an output section.
The plurality of incoherent light sources 11 output incoherent light IL having wavelengths different from each other, respectively. Further, incoherent light means light composed of a collection of uncorrelated photons having a continuous spectrum, rather than a laser light source that oscillates in a single or multiple discrete modes (longitudinal modes). The plurality of incoherent light sources 11 include at least one of an SLD (Super Luminescent Diode), an SOA (Semiconductor Optical Amplifier), and an ASE (Amplified Spontaneous Emission) light source including a rare earth-doped fiber (e.g., EDF), and in embodiment 1, all are SLDs.
The plurality of excitation light sources 12 output second-order excitation light SPL having wavelengths different from each other and raman-amplified incoherent light IL. The plurality of excitation light sources 12 include at least one of fabry-perot (FP) type semiconductor lasers having different wavelengths, FP-FBG type semiconductor lasers in which FP type and Fiber Bragg Grating (FBG) are combined, DFB type semiconductor lasers, and DBR type semiconductor lasers, and in embodiment 1, all of them are FP type semiconductor lasers.
The WDM coupler 13 combines each incoherent light IL and each second-order excitation light SPL to output. Fig. 2 is a diagram showing an example of the configuration of the WDM coupler 13. The WDM coupler 13 has a structure in which a plurality of WDM couplers 13a each including a dielectric multilayer film filter and a plurality of WDM couplers 13b each including a dielectric multilayer film filter are connected in series via an optical fiber. Each WDM coupler 13a is connected to each incoherent light source 11 via an optical fiber, and has wavelength characteristics of reflecting incoherent light IL output from the connected incoherent light source 11 and transmitting light of other wavelengths. Similarly, each WDM coupler 13b is connected to each excitation light source 12 via an optical fiber, and has wavelength characteristics of reflecting the second-order excitation light SPL output from the connected excitation light source 12 and transmitting light of other wavelengths. Thus, the WDM coupler 13 can multiplex the incoherent light IL and the second-order excitation light SPL and output the resultant light from the output port 13 c.
Fig. 3 is a diagram showing a WDM coupler 13' as another example of the configuration of the WDM coupler. The WDM coupler 13 'includes an Arrayed Waveguide Grating (AWG) 13' a using a Planar Lightwave Circuit (PLC). Each of the plurality of ports 13 ' aa on the multi-port side of AWG13 ' a is connected to each incoherent light source 11, and each of the plurality of ports 13 ' ab is connected to each excitation light source 12. Thus, the WDM coupler 13 'can multiplex the incoherent light IL and the second-order excitation light SPL and output the resultant light from the output port 13' ac.
Returning to fig. 1. The raman amplification optical fiber 14 is connected to the plurality of incoherent light sources 11 and the plurality of excitation light sources 12 via the WDM coupler 13, raman-amplifies each of the input incoherent light IL with the input second-order excitation light SPL, and outputs the amplified light as incoherent amplified light. The raman amplification optical fiber 14 is a known optical fiber such as a highly nonlinear fiber. Here, the plurality of incoherent light sources 11 and the plurality of excitation light sources 12 are connected to a raman amplification optical fiber 14 via a WDM coupler 13 so that the second order excitation light SPL forward-excites the incoherent light IL. That is, the propagation direction of the second-order excitation light SPL and the propagation direction of the incoherent light IL are the same direction in the raman amplification optical fiber 14.
The WDM coupler 15 as an output unit is connected to the optical transmission fiber 1002, receives the incoherent amplified light as input, and outputs the first-order excitation light FPL having a wavelength of raman-amplifying the signal light S1 to the optical transmission fiber 1002. The WDM coupler 15 is a known WDM coupler using a dielectric multilayer filter or the like. Here, the WDM coupler 15 is connected to the optical transmission fiber 1002 such that the first-order excitation light FPL forward-excites the signal light S1. That is, the WDM coupler 15 is connected to the optical transmission fiber 1002 such that the propagation direction of the first-order excitation light FPL and the propagation direction of the signal light S1 are the same direction. Thus, the signal light S1 transmitted in the optical transmission fiber 1002 is raman-amplified by the first-order excitation light FPL by the stimulated raman scattering phenomenon in the optical transmission fiber 1002.
It is known that when incoherent light is used as the first-order excitation light, the RIN shift from the first-order excitation light to the signal light can be reduced, but since the output power of the incoherent light source is generally low, it is difficult to use it as a first-order excitation light source for raman amplification.
In contrast, the present inventors have found that when incoherent light raman-amplified by coherent second-order excitation light of an FP-type semiconductor laser or the like is used as the first-order excitation light, the RIN shift to the signal light can be reduced. Then, in the raman amplification system 100, the raman amplification light source 10 is configured such that the plurality of excitation light sources 12 made of FP type semiconductor lasers are raman-amplified as second order excitation light SPL by the raman amplification optical fiber 14 to obtain incoherent light, and the obtained incoherent light is raman-amplified as first order excitation light FPL by the optical transmission fiber 1002 to the signal light S1. Thus, a low RIN transition can be achieved.
Further, the incoherent light IL has a wider emission band than a coherent light source such as an FP type semiconductor laser, and has a low peak intensity with respect to the entire intensity of the emitted light. Therefore, it is amplified to be used as the first-order excitation light FPL, thereby enabling low SBS. Further, according to the width of the wavelength band of the emitted light of the incoherent light IL, the four-wave mixing, which is a typical nonlinear effect, hardly satisfies the phase matching condition thereof, and the occurrence of the four-wave mixing is suppressed. Thereby, a low non-linear effect can be achieved.
Further, since the plurality of incoherent light sources 11 each outputting incoherent light IL having a different wavelength from each other and the plurality of excitation light sources 12 each outputting second-order excitation light SPL having a different wavelength from each other are provided, the amplification gain of the signal light can be controlled in a wide-band wavelength region to perform optical amplification.
Thus, the raman amplification light source 10 can simultaneously solve the above 4 problems.
The wavelength, number, frequency band, and power of the excitation light source 12 and the incoherent light source 11 can be appropriately adjusted according to the amplification frequency band of the signal light S1 to be amplified, a desired gain, and gain flatness.
Next, examples of the arrangement of the wavelengths and the powers of the incoherent light and the second-order excitation light will be described. Fig. 4 is a diagram showing an example of arrangement of the wavelengths of the incoherent light and the second-order excitation light. In the example shown in fig. 4, the number of incoherent light sources 11(SLD) is 2, and the number of excitation light sources 12 (excitation FP-LD) is 4. As shown in FIG. 4, the wavelengths of the second-order excitation lights SPLA, SPLB, SPLC, and SPLD are 1350nm, 1370nm, 1380nm, and 1400nm, respectively, and the powers are 250 mW. The wavelengths of the incoherent light ILA and ILB were 1450nm and 1480nm, respectively, the 3dB bandwidths were 30nm, and the powers were 5mW, respectively. Raman gain bands having raman peaks RPA, RPB, RPC, and RPD of the second-order excitation lights as peak positions are formed at positions raman-shifted by about 100nm from the second-order excitation lights SPLA, SPLB, SPLC, and SPLD, respectively. Thereby, the incoherent light ILA and ILB is raman-amplified to become first-order excitation light FPL. Here, in the example shown in fig. 4, the wavelengths of the second-order excitation lights SPLA, SPLB, SPLC, and SPLD are set so that the raman peaks RPA, RPB, RPC, and RPD are located at the wavelength at which the light intensity on the long wavelength side is low and the wavelength at which the light intensity on the short wavelength side is low with respect to the peak wavelength of the incoherent lights ILA and ILB, and therefore, a high raman gain can be given to the light at the wavelength at which the light intensity of the incoherent lights ILA and ILB is low. As a result, the first-order excitation light FPL becomes a flatter spectral shape with respect to the wavelength.
For example, in embodiment 1, when the second-order excitation light SPLA, SPLB, SPLC, SPLD, incoherent light ILA, ILB is set as described above, incoherent raman amplification light (first-order excitation light) having high power and a wide band of about 1430nm to 1500nm can be obtained, and signal light in the C + L band used for optical communication of about 1530nm to 1625nm can be raman-amplified.
In addition, the plurality of incoherent light sources 11 may be configured to output different waves by using SLD and EDF-based ASE light sources, SOA and SLD, or the likeBy combining different types of incoherent light sources of the segment incoherent light to widen the excitation light band, the gain band can be easily widened. For example, when an SOA operating in a band of several tens of nm centered on a 1480nm band is used as the incoherent light source, it is difficult to operate the SOA at other wavelengths. Therefore, when the SOA is used together with the SLD and ASE light sources, the excitation light band can be expanded to 1300nm or 1550nm instead of 1480 nm. Further, the use of an ASE light source using an optical fiber to which different rare earth elements (Er or Er and Al) are added as an ASE light source enables widening the excitation light band2O3Yb co-doped, PbS semiconductor quantum dots) optical fibers, and optical fibers to which different rare earth elements are commonly added.
(embodiment mode 2)
Fig. 5 is a schematic configuration diagram of a raman amplification system using the raman amplification light source according to embodiment 2. The raman amplification system 100A includes a raman amplification light source 10A and an optical transmission fiber 1002.
The raman amplification light source 10A includes: a plurality of incoherent light sources 11, a plurality of excitation light sources 12, WDM couplers 13Aa and 13Ab, a raman amplification optical fiber 14, and a WDM coupler 15.
The WDM coupler 13Aa multiplexes the incoherent lights IL and outputs them. The WDM coupler 13Ab multiplexes and outputs the second-order excitation light SPL. The WDM couplers 13Aa and 13Ab can be configured using dielectric multilayer filters and AWGs as illustrated in fig. 2 and 3.
The raman amplification optical fiber 14 is connected to the plurality of incoherent light sources 11 via the WDM coupler 13Aa, and is connected to the plurality of excitation light sources 12 via the WDM coupler 13 Ab. The raman amplification optical fiber 14 raman-amplifies each of the input incoherent lights IL with the input second-order excitation light SPL, and outputs the amplified incoherent lights as incoherent amplified light. Here, the plurality of incoherent light sources 11 and the plurality of excitation light sources 12 are connected to the raman amplification optical fiber 14 via WDM couplers 13Aa and 13Ab, respectively, so that the second order excitation light SPL excites the incoherent light IL backward. That is, in the raman amplification optical fiber 14, the propagation direction of the second-order excitation light SPL and the propagation direction of the incoherent light IL are opposite to each other.
The WDM coupler 15 is connected to the optical transmission fiber 1002, receives the incoherently amplified light as input, generates first-order pump light FPL having a wavelength of raman-amplifying the signal light S1, and outputs the first-order pump light FPL to the optical transmission fiber 1002. Here, the WDM coupler 15 is connected to the optical transmission fiber 1002 such that the first-order excitation light FPL forward-excites the signal light S1. Thus, the signal light S1 is raman-amplified by the first-order excitation light FPL in the optical transmission fiber 1002.
The raman amplification light source 10A can simultaneously solve the above 4 problems, similarly to the raman amplification light source 10. Further, in the raman amplification light source 10A, the second order excitation light SPL is backward-excited in the raman amplification optical fiber 14 to raman-amplify the incoherent light IL. Thus, the RIN transition of the second order excitation light SPL to the incoherent light IL is further reduced, and therefore the RIN transition to the signal light S1 is also further reduced.
(embodiment mode 3)
Fig. 6 is a schematic configuration diagram of a raman amplification system using the raman amplification light source according to embodiment 3. The raman amplification system 100B includes a raman amplification light source 10B and an optical transmission fiber 1002.
The raman amplification light source 10B has a structure in which the WDM coupler 15 of the raman amplification light source 10 is replaced with a WDM coupler 15B. The WDM coupler 15B is connected to the optical transmission fiber 1002, receives the incoherently amplified light as input, generates first-order excitation light FPL having a wavelength of raman-amplifying the signal light S1, and outputs the first-order excitation light FPL to the optical transmission fiber 1002. Here, the WDM coupler 15B is connected to the optical transmission fiber 1002 such that the first-order excitation light FPL backward excites the signal light S1. That is, the WDM coupler 15B is connected to the optical transmission fiber 1002 such that the propagation direction of the first-order excitation light FPL and the propagation direction of the signal light S1 become opposite directions. Thus, the signal light S1 is raman-amplified by the first-order excitation light FPL in the optical transmission fiber 1002.
The raman amplification light source 10B can simultaneously solve the above 4 problems, similarly to the raman amplification light source 10. In the case of the raman amplification light source 10B, the low nonlinear effect can be further suppressed as compared with the case of the forward excitation type as in the raman amplification light source 10. This is because, since it is of the backward excitation type, the signal light S1 starts to be subjected to the transmission loss of the optical transmission fiber 1002 and is amplified by raman amplification based on the first-order excitation light FPL after the power starts to become small, so the power of the signal light S1 is kept smaller in the optical transmission fiber 1002 than that of the forward excitation type, and since the first-order excitation light FPL and the signal light S1 propagate in the reverse direction, it is difficult to satisfy the phase matching condition causing the nonlinear effect compared to the forward excitation.
(embodiment mode 4)
Fig. 7 is a schematic configuration diagram of a raman amplification system using the raman amplification light source according to embodiment 4. The raman amplification system 100C includes a raman amplification light source 10C and an optical transmission fiber 1002.
The raman amplification light source 10C has a structure in which the WDM coupler 15 of the raman amplification light source 10A is replaced with a WDM coupler 15C. The WDM coupler 15C is connected to the optical transmission fiber 1002, receives the incoherently amplified light as input, generates first-order excitation light FPL having a wavelength of raman-amplifying the signal light S1, and outputs the first-order excitation light FPL to the optical transmission fiber 1002. Here, the WDM coupler 15C is connected to the optical transmission fiber 1002 such that the first-order excitation light FPL backward excites the signal light S1. That is, the WDM coupler 15C is connected to the optical transmission fiber 1002 such that the propagation direction of the first-order excitation light FPL and the propagation direction of the signal light S1 become opposite directions. Thus, the signal light S1 is raman-amplified by the first-order excitation light FPL in the optical transmission fiber 1002.
The raman amplification light source 10C can simultaneously solve the above 4 problems, similarly to the raman amplification light source 10. Further, in the raman amplification light source 10C, the second order excitation light SPL is raman-amplified by backward excitation of the incoherent light IL in the raman amplification optical fiber 14, similarly to the raman amplification light source 10A. Thus, the RIN transition of the second order excitation light SPL to the incoherent light IL is further reduced, and therefore the RIN transition to the signal light S1 is also further reduced.
(embodiment 5)
Fig. 8 is a schematic configuration diagram of a raman amplification system using the raman amplification light source according to embodiment 5. The raman amplification system 100D includes a raman amplification light source system 10D and an optical transmission fiber 1002.
The raman amplification light source system 10D includes a raman amplification light source 10 and a raman amplification light source 10B, and the WDM couplers 15 and 15B of the raman amplification light sources 10 and 10B are connected to the optical transmission fiber 1002 such that the first-order excitation light FPL output from the WDM couplers 15 and 15B bidirectionally excites the signal light S1. That is, the raman amplification system 100D is a bidirectional excitation system using the raman amplification light source system 10D.
The raman amplification light source system 10D can also solve the above 4 problems at the same time. Further, according to the raman amplification light source system 10D, since it is a bidirectional excitation type, it is easy to achieve wavelength flattening of raman gain, broadband, and wavelength flattening of NF.
Further, the raman amplification light source system may be configured by the raman amplification light source 10A and the raman amplification light source 10C, and the WDM couplers 15 and 15C of the raman amplification light sources 10A and 10C may be connected to the optical transmission fiber 1002 so that the signal light S1 is bidirectionally excited by the first-order excitation light FPL output from the respective sources, thereby configuring a bidirectional excitation raman amplification system similar to the raman amplification system 100D.
(embodiment mode 6)
Fig. 9 is a schematic configuration diagram of a raman amplification system using the raman amplification light source according to embodiment 6. The raman amplification system 100E includes a raman amplification light source 10E and an optical transmission fiber 1002.
The raman amplification light source 10E includes: a plurality of incoherent light sources 11, a plurality of excitation light sources 12, and a WDM coupler 13 as an output section.
The WDM coupler 13 is connected to the plurality of incoherent light sources 11, the plurality of excitation light sources 12, and the optical transmission fiber 1002, and outputs the incoherent light IL input from each incoherent light source 11 and the second-order excitation light SPL input from each excitation light source 12 so as to propagate in the same direction through the optical transmission fiber 1002. Further, the WDM coupler 13 is connected to the optical transmission fiber 1002 such that each incoherent light IL and each second-order excitation light SPL propagate in the optical transmission fiber 1002 in the same direction as the signal light S1. Such a configuration can be realized by connecting the WDM coupler 13 shown in fig. 2 to the optical transmission fiber 1002 such that the signal light S1 is input from the input port 13d and output from the output port 13 c. In the case of using the WDM coupler 13 'shown in fig. 3, a port 13' ad for signal light multiplexing may be provided, and the signal light S1 may be input from the port 13 'ad, and the signal light S1, the incoherent light IL, and the second-order excitation light SPL may be multiplexed and output from the output port 13' ac, by connecting the port to the optical transmission fiber 1002.
In the raman amplification system 100E, in the optical transmission fiber 1002, the incoherent light beams IL are gradually raman-amplified by the second-order excitation light beams SPL, and first-order excitation light beams FPL having wavelengths for raman-amplifying the signal light beams S1 are generated. The first-order excitation light FPL propagates in the same direction as the signal light S1, and raman-amplifies the signal light S1. That is, the raman amplification system 100E is a forward excitation type and a second-order excitation type raman amplification system.
The raman amplification light source 10E can also solve the above 4 problems at the same time. Further, according to the raman amplification light source 10E, the power of the first order excitation light FPL for raman-amplifying the signal light S1 is small in the optical transmission fiber 1002 near the WDM coupler 13, and thus the raman gain of the signal light S1 is small, but the incoherent light IL is amplified by the second order excitation light SPL as the signal light S1 is transmitted through the optical transmission fiber 1002, and thus the power of the first order excitation light FPL becomes large and the raman gain with respect to the signal light S1 becomes large. Thus, the transmission loss and the raman gain are well cancelled when viewed as the entire optical transmission fiber 1002, and the nonlinear effect can be further reduced by considering a transmission path in which the transmission loss of the optical fiber is 0 or the fluctuation of the power of the signal light S1 in the longitudinal direction of the optical transmission fiber 1002 is small.
In addition, with the configuration of the raman amplification system 100E, as illustrated in fig. 4, the raman amplification experiment was performed with the wavelengths of the second-order excitation light SPLA, SPLB, SPLC, SPLD being 1350nm, 1370nm, 1380nm, and 1400nm, the powers being 250mW, the wavelengths of the incoherent light ILA and ILB being 1450nm and 1480nm, the 3dB bandwidths being 30nm, and the powers being 5 mW. The signal light S1 is WDM signal light composed of 4 signal lights, and its wavelength is 1530nm, 1560nm, 1590nm, 1620 nm. The length of the optical transmission fiber 1002 was set to 50 km. As a result, a raman gain of about 10dB was obtained at the wavelength of each signal light. In addition, the difference between the maximum raman gain and the minimum raman gain among the wavelengths of the 4 signal lights is 1dB or less.
In addition, according to the raman amplification light source 10E, the raman amplification system 100E can operate not only as a second-order excitation system but also as a third-order excitation system or a higher-order excitation system by setting the wavelength of the second-order excitation light SPL. For example, when (a)1380nm ± 20nm is used as the wavelength of the second order excitation light SPL and (b) an SLD of 1480nm ± 20nm is used as the incoherent light source 11, the second order excitation raman amplification system operates such that (a) raman-amplifies (b), and the amplified (b) raman-amplifies the signal light S1 in a wavelength region around 1590nm ± 20 nm.
For example, if (a)1290nm ± 20nm and (a ') 1380nm ± 20nm are used as the wavelength of the second-order excitation light SPL and (b)1480nm ± 20nm SLD is used as the incoherent light source 11, the system operates as a third-order excitation raman amplification system in which (a') is raman-amplified, and (a ') and (b') are raman-amplified, and (b) after the raman amplification is raman-amplified, and signal light S1 in a wavelength region around 1590nm ± 20nm is raman-amplified. In this case, the raman amplification light source 10E includes an excitation light source that outputs excitation light having a wavelength for raman-amplifying the second-order excitation light SPL output from at least 1 of the plurality of excitation light sources 12. In this case, by adjusting the powers of (a), (a') and (b), the above 4 problems can be simultaneously achieved, and further, the raman gain can be easily flattened, the bandwidth can be widened, and NF can be easily flattened.
(embodiment 7)
Fig. 10 is a schematic configuration diagram of a raman amplification system using the raman amplification light source system according to embodiment 7. The raman amplification system 100F is composed of a raman amplification light source system 10F and an optical transmission fiber 1002.
The raman amplification light source system 10F includes a raman amplification light source 10E and a raman amplification light source 10 EA. The raman amplification light source 10EA has a structure in which the WDM coupler 13 is connected to the optical transmission fiber 1002 in the raman amplification light source 10E so that the signal light S1 is input from the output port 13c and is output from the input port 13 d. In the optical transmission fiber 1002, the incoherent light IL inputted from the raman amplification light source 10EA is gradually raman-amplified by the second order excitation light SPL, and generates first order excitation light FPL having a wavelength for raman-amplifying the signal light S1. The first-order excitation light FPL propagates in the opposite direction to the signal light S1, and raman-amplifies the signal light S1. On the other hand, the first-order excitation light FPL generated by the raman amplification light source 10E propagates in the same direction as the signal light S1, and raman-amplifies the signal light S1.
In this way, the WDM coupler 13 of each of the raman amplification light sources 10E and 10EA is connected to the optical transmission fiber 1002 so that the first-order excitation light FPL bidirectionally excites the signal light S1, and the raman amplification system 100F becomes a two-way excitation type and two-order excitation type raman amplification system using the raman amplification light source system 10F.
According to the raman amplification light source system 10F, the above-described 4 problems can be simultaneously solved, the nonlinear effect can be further reduced as in the case of the raman amplification light source 10E, and the degree of freedom in designing the power distribution of the signal light S1 in the longitudinal direction of the optical transmission fiber 1002 can be improved because of the bidirectional excitation type. For example, the wavelength, number, band, and power of the excitation light source 12 and the incoherent light source 11 in each of the raman amplification light sources 10E and 10EA can adjust the amplification band, desired gain, and gain flatness of the signal light S1 to be amplified, and can also adjust the power distribution of the signal light S1 in the longitudinal direction. Further, according to the raman amplification light source system 10F, the raman amplification system 100F can operate not only as a second-order excitation system but also as a third-order excitation system or a higher-order excitation system, as in the raman amplification system 100E.
(embodiment mode 8)
Fig. 11 is a schematic configuration diagram of a raman amplification system using the raman amplification light source system according to embodiment 8. The raman amplification system 100H includes a raman amplification light source system 10H and an optical transmission fiber 1002.
The raman amplification light source system 10H includes a1 st light source unit 10HA and a 2 nd light source unit 10 HB. The 1 st light source unit 10HA includes: a1 st plurality of incoherent light sources 11A that output incoherent light IL; and a WDM coupler 16 connected to the 1 st plurality of incoherent light sources 11A and the optical transmission fiber 1002, and outputting incoherent light IL to the 1 st output section of the optical transmission fiber 1002. The 2 nd light source unit 10HB includes: a1 st plurality of excitation light sources 12A that output second-order excitation light SPL having a wavelength at which incoherent light IL is raman-amplified; and a WDM coupler 17 connected to the 1 st plurality of excitation light sources 12A and the optical transmission fiber 1002 and outputting the second-order excitation light SPL to the 2 nd output section of the optical transmission fiber 1002.
The 1 st plurality of incoherent light sources 11A output incoherent light IL having wavelengths different from each other, as in the plurality of incoherent light sources 11. The 1 st plurality of incoherent light sources 11A includes at least one of an SLD, an SOA, and an ASE light source including a rare earth-doped fiber, and in embodiment 8, all of them are SLDs. The power of the incoherent light IL output from each incoherent light source 11A is, for example, 40 mW.
The 1 st plurality of excitation light sources 12A output second-order excitation light SPL having wavelengths different from each other and raman-amplified incoherent light IL, as in the plurality of excitation light sources 12. The 1 st plurality of excitation light sources 12A include at least one of FP type, FP-FBG type, DFB type, and DBR type semiconductor lasers having different wavelengths, and all of them are FP type semiconductor lasers in embodiment 8. The power of the second-order excitation light SPL output from each excitation light source 12A is, for example, 500 mW.
The WDM coupler 16 and the WDM coupler 17 are connected to the optical transmission fiber 1002 such that the incoherent light IL and the second-order excitation light SPL propagate in opposite directions in the optical transmission fiber 1002 between the WDM coupler 16 and the WDM coupler 17. Specifically, the incoherent light IL propagates in the same direction as the signal light S1, and the second-order excitation light SPL propagates in the opposite direction to the signal light S1.
In the raman amplification light source system 10H, the incoherent light IL inputted into the optical transmission fiber 1002 between the WDM coupler 16 and the WDM coupler 17 is gradually raman-amplified by the second-order excitation light SPL, and the first-order excitation light FPL having the wavelength at which the signal light S1 is raman-amplified is generated. The first-order excitation light FPL propagates in the same direction as the signal light S1, and raman-amplifies the signal light S1. That is, the raman amplification system 100H is a forward excitation type and a second-order excitation type raman amplification system.
The raman amplification light source system 10H can also solve the above 4 problems at the same time. Further, according to the raman amplification light source system 10H, by the same action as the raman amplification light source 10E, the transmission loss and the raman gain are well cancelled when viewed as the entire optical transmission fiber 1002, and it can be considered as a transmission path in which the transmission loss of the optical fiber is 0 or the fluctuation of the power of the signal light S1 in the longitudinal direction of the optical transmission fiber 1002 is small, and the nonlinear effect can be further reduced. Further, according to the raman amplification light source system 10H, the raman amplification system 100H can operate not only as a second-order excitation system but also as a third-order excitation system or a higher-order excitation system, as in the raman amplification system 100E.
(embodiment mode 9)
Fig. 12 is a schematic configuration diagram of a raman amplification system using the raman amplification light source system according to embodiment 9. The raman amplification system 100I is composed of a raman amplification light source system 10I and an optical transmission fiber 1002.
The raman amplification light source system 10I also includes the 1 st light source unit 10HA and the 2 nd light source unit 10HB, as in the raman amplification light source system 10H. Further, the same as the raman amplification light source system 10H is also true in that the WDM coupler 16 and the WDM coupler 17 are connected to the optical transmission fiber 1002 so that the incoherent light IL and the second-order excitation light SPL propagate in opposite directions in the optical transmission fiber 1002 between the WDM coupler 16 and the WDM coupler 17. However, unlike the raman amplification light source system 10H, the WDM coupler 16 and the WDM coupler 17 are connected to the optical transmission fiber 1002 such that the incoherent light IL propagates in the direction opposite to the signal light S1, and the second-order excitation light SPL propagates in the same direction as the signal light S1.
In the raman amplification light source system 10I, as in the case of the raman amplification light source system 10H, the incoherent light IL inputted into the optical transmission fiber 1002 between the WDM coupler 16 and the WDM coupler 17 is gradually raman-amplified by the second-order excitation light SPL, and the first-order excitation light FPL having a wavelength for raman-amplifying the signal light S1 is generated. However, unlike the case of the raman amplification light source system 10H, the first-order excitation light FPL propagates in the direction opposite to the signal light S1, and raman-amplifies the signal light S1. That is, the raman amplification system 100I is a backward excitation type and a second-order excitation type raman amplification system.
The raman amplification light source system 10I can also solve the above 4 problems at the same time. Further, according to the raman amplification light source system 10I, the raman amplification system 100I can operate not only as a second-order excitation system but also as a third-order excitation system or a higher-order excitation system, as in the raman amplification system 100E.
(embodiment mode 10)
Fig. 13 is a schematic configuration diagram of a raman amplification system using the raman amplification light source system according to embodiment 10. The raman amplification system 100J includes a raman amplification light source system 10J and an optical transmission fiber 1002.
The raman amplification light source system 10J includes the 1 st light source unit 10HAA and the 2 nd light source unit 10 HBA. The 1 st light source unit 10HAA includes: a1 st plurality of incoherent light sources 11A that output incoherent light IL; a 2 nd plurality of excitation light sources 12B that output 2 nd order excitation light SPL 2; the 1 st plurality of incoherent light sources 11A, the 2 nd plurality of excitation light sources 12B, and the optical transmission fiber 1002 are connected, and the incoherent light IL and the 2 nd order excitation light SPL2 are output to the WDM coupler 16A, which is the 1 st output section of the optical transmission fiber 1002. The 2 nd light source unit 10HBA includes: a1 st plurality of excitation light sources 12A that output second-order excitation light SPL; a 2 nd plurality of incoherent light sources 11B that output a 2 nd incoherent light IL 2; and a WDM coupler 17A connected to the 1 st plurality of excitation light sources 12A, the 2 nd plurality of incoherent light sources 11B, and the optical transmission fiber 1002, and outputting the 2 nd incoherent light IL2 and the second order excitation light SPL to the 2 nd output section of the optical transmission fiber 1002.
The 2 nd incoherent light source 11B outputs the 2 nd incoherent light IL2 having a wavelength raman-amplified by the 2 nd order excitation light SPL2 output from the 2 nd excitation light source 12B. The 1 st plurality of excitation light sources 12A output second-order excitation light SPL having a wavelength for raman-amplifying the incoherent light IL output from the 1 st plurality of incoherent light sources 11A.
The WDM coupler 16A and the WDM coupler 17A are connected to the optical transmission fiber 1002 such that the incoherent light IL and the second order excitation light SPL propagate in opposite directions in the optical transmission fiber 1002 between the WDM coupler 16A and the WDM coupler 17A, and the 2 nd incoherent light IL2 and the 2 nd second order excitation light SPL2 propagate in opposite directions in the optical transmission fiber 1002 between the WDM coupler 16A and the WDM coupler 17A. Specifically, the incoherent light IL and the second-order 2 excitation light SPL2 propagate in the same direction as the signal light S1, and the second-order excitation light SPL and the second-order 2 incoherent light IL2 propagate in the opposite direction to the signal light S1.
In the raman amplification light source system 10J, the incoherent light IL input to the optical transmission fiber 1002 between the WDM coupler 16A and the WDM coupler 17A is gradually raman-amplified by the second-order excitation light SPL, and first-order excitation light FPL having a wavelength at which the signal light S1 is raman-amplified is generated. Further, in the raman amplification light source system 10J, the 2 nd incoherent light IL2 input into the optical transmission fiber 1002 between the WDM coupler 16A and the WDM coupler 17A is gradually raman-amplified by the 2 nd order excitation light SPL2, and the 2 nd order excitation light FPL2 having the wavelength of raman-amplifying the signal light S1 is generated. The first-order excitation light FPL propagates in the same direction as the signal light S1, and the 2 nd first-order excitation light FPL2 propagates in the opposite direction to the signal light S1, and raman-amplifies the signal light S1. That is, the raman amplification system 100J is a bidirectional excitation type and a second-order excitation type raman amplification system.
The raman amplification light source system 10J can also solve the above 4 problems at the same time. Further, according to the raman amplification light source system 10J, since it is a bidirectional excitation type, it is possible to improve the degree of freedom in designing the power distribution of the signal light S1 in the longitudinal direction of the optical transmission fiber 1002. For example, the wavelength, number, frequency band, and power of the excitation light sources 12A and 12B and the incoherent light sources 11A and 11B in the light source units 10HAA and 10HBA can adjust the amplification band of the signal light S1 to be amplified, a desired gain, and gain flatness, and also adjust the power distribution of the signal light S1 in the longitudinal direction. Further, in the raman amplification system 100J, the second order excitation light for raman-amplifying the incoherent light IL input from the front is not limited to the second order excitation light SPL introduced from the rear, and the incoherent light IL input from the front may be raman-amplified by the 2 nd second order excitation light SPL2 input from the front. Which second-order excitation light raman-amplifies which incoherent light depends on the design of the system. Further, according to the raman amplification light source system 10J, the raman amplification system 100J can operate not only as a second-order excitation system but also as a third-order excitation system or a higher-order excitation system, as in the raman amplification system 100E.
In the above embodiment, the plurality of incoherent light sources 11, 11A, or 11B may include an incoherent light source 11C configured by connecting the SOAs 11A in multiple stages and outputting incoherent light IL or IL2 as shown in fig. 14 (a), or may include an incoherent light source 11D configured by including an SLD11B and an SOA11A and by optically amplifying the incoherent light output from the SLD11B with the SOA11A and outputting the incoherent light IL or IL2 as shown in fig. 14 (B). This can increase the power of incoherent light IL or IL 2.
The present invention is not limited to the above embodiments. The present invention also encompasses a structure in which the above-described respective components are appropriately combined. Further effects, modifications, and the like can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above-described embodiments, and various modifications are possible.
Industrial applicability
As described above, the raman amplification light source system, the raman amplifier, and the raman amplification system according to the present invention are useful for optical fiber communication.
Description of the symbols
10. Light source for Raman amplification of 10A, 10B, 10C, 10E, 10EA
Light source system for 10D, 10F, 10H, 10I, 10J Raman amplification
10HA, 10HAA No.1 light source unit
10HB and 10HBA 2 nd light source unit
11. 11A, 11B, 11C, 11D incoherent light source
12. 12A, 12B excitation light source
13. 13', 13a, 13B, 13Aa, 13Ab, 15B, 15C, 16A, 17A WDM coupler
13′a AWG
13c, 13' ac output port
13d input port
13 ' aa, 13 ' ab, 13 ' ad ports
14 optical fiber for Raman amplification
100. 100A, 100B, 100C, 100D, 100E, 100F, 100H, 100I, 100J Raman amplification system
1000 optical transmission system
1001 transmitter
1002 optical transmission fiber
1003 receiver
FPL first-order excitation light
FPL2 first order 2 excitation light
Incoherent light of IL, ILA and ILB
IL2 No. 2 incoherent light
RPA, RPB, RPC, RPD Raman peaks
S1 Signal light
Second order excitation light of SPL and SPLA
SPL2 second order 2 excitation light.

Claims (17)

1. A raman amplification light source for raman-amplifying signal light transmitted through an optical transmission fiber by a stimulated raman scattering phenomenon in the optical transmission fiber, the raman amplification light source comprising:
a plurality of incoherent light sources outputting incoherent light;
a plurality of excitation light sources that output second-order excitation light having a wavelength at which the incoherent light is raman-amplified;
a raman amplification optical fiber connected to the plurality of incoherent light sources and the plurality of excitation light sources, for raman-amplifying the input incoherent light with the input second-order excitation light and outputting the amplified incoherent light; and
an output unit connected to the optical transmission fiber, to which incoherent amplification light raman-amplified by the raman amplification optical fiber is input, and which outputs first-order excitation light to the optical transmission fiber, the first-order excitation light having a wavelength at which the signal light is raman-amplified and propagating through the optical transmission fiber in a direction in which the signal light is forward-excited,
the plurality of incoherent light sources include an incoherent light source configured by connecting semiconductor optical amplifiers in multiple stages.
2. The Raman amplification light source according to claim 1,
the plurality of incoherent light sources and the plurality of excitation light sources are connected with the Raman amplification optical fiber, so that the second-order excitation light performs forward excitation on the incoherent light.
3. The Raman amplification light source according to claim 1,
the plurality of incoherent light sources and the plurality of excitation light sources are connected to the raman amplification optical fiber so that the second-order excitation light backward excites the incoherent light.
4. The light source for Raman amplification according to any one of claims 1 to 3,
the output section is connected to the optical transmission fiber so that the first-order excitation light forward-excites the signal light.
5. A raman amplification light source for raman-amplifying a signal light transmitted through an optical transmission fiber, the raman amplification light source comprising:
a plurality of incoherent light sources outputting incoherent light;
a plurality of excitation light sources that output second-order excitation light having a wavelength at which the incoherent light is raman-amplified; and
an output section connected to the plurality of incoherent light sources, the plurality of excitation light sources, and the optical transmission fiber, and outputting the incoherent light and the second-order excitation light that are input so as to propagate in the same direction in the optical transmission fiber,
in the optical transmission fiber, Raman-amplifying the input incoherent light by the input second-order excitation light, generating first-order excitation light having a wavelength at which the signal light is Raman-amplified and propagating in the optical transmission fiber in a direction in which the signal light is forward-excited,
the plurality of incoherent light sources include an incoherent light source configured by connecting semiconductor optical amplifiers in multiple stages.
6. The Raman amplification light source according to claim 5,
the disclosed device is provided with: and another excitation light source that outputs excitation light having a wavelength for raman-amplifying the second-order excitation light output from at least one of the plurality of excitation light sources.
7. The Raman amplification light source according to any one of claims 1 to 3 and 5 to 6,
the plurality of incoherent light sources include an incoherent light source that includes a superluminescent light emitting diode and a semiconductor optical amplifier and is configured to optically amplify and output incoherent light output from the superluminescent light emitting diode by the semiconductor optical amplifier.
8. The Raman amplification light source according to any one of claims 1 to 3 and 5 to 6,
the plurality of excitation light sources include at least one of a fabry-perot type, a fabry-perot-fiber bragg grating type in which a fabry-perot type and a fiber bragg grating are combined, a distributed feedback type, and a distributed bragg reflection type semiconductor laser.
9. The Raman amplification light source according to any one of claims 1 to 3 and 5 to 6,
the plurality of incoherent light sources include incoherent light sources that output incoherent light of mutually different wavelength bands.
10. A light source system for Raman amplification, characterized in that,
the Raman amplification light source according to claim 5, wherein an output unit of each of the Raman amplification light sources is connected to the optical transmission fiber so that the first-order excitation light excites the signal light in both directions.
11. A Raman amplification light source system for Raman-amplifying a signal light transmitted through an optical transmission fiber via the optical transmission fiber, the Raman amplification light source system comprising:
the 1 st light source unit includes: a1 st output unit which outputs the incoherent light, and which is connected to the 1 st incoherent light source and the optical transmission fiber, and outputs the incoherent light to the optical transmission fiber; and
a 2 nd light source unit including: a1 st plurality of excitation light sources that output second order excitation light having a wavelength for raman-amplifying the incoherent light, and a 2 nd output unit that is connected to the 1 st plurality of excitation light sources and the optical transmission fiber and outputs the second order excitation light to the optical transmission fiber,
the 1 st output section and the 2 nd output section are connected to the optical transmission fiber such that the incoherent light and the second order excitation light propagate in opposite directions in the optical transmission fiber between the 1 st output section and the 2 nd output section,
in the optical transmission fiber between the 1 st output unit and the 2 nd output unit, Raman-amplifying the input incoherent light by the input second-order excitation light, generating first-order excitation light having a wavelength at which the signal light is Raman-amplified and propagating in the optical transmission fiber in a direction in which the signal light is forward-excited,
the plurality of incoherent light sources include an incoherent light source configured by connecting semiconductor optical amplifiers in multiple stages.
12. The Raman amplification light source system according to claim 11,
the 2 nd light source unit includes a 2 nd plurality of incoherent light sources that output 2 nd incoherent light having a wavelength raman-amplified by the second order excitation light,
the 1 st light source unit includes a 2 nd plurality of excitation light sources that output 2 nd order excitation light having a wavelength at which the 2 nd incoherent light is raman-amplified,
a 2 nd output section of the 2 nd light source section is connected to the 2 nd plurality of incoherent light sources, outputs the 2 nd incoherent light to the optical transmission fiber,
a1 st output unit of the 1 st light source unit is connected to the 2 nd plurality of excitation light sources and outputs the 2 nd order excitation light to the optical transmission fiber,
the 1 st output section and the 2 nd output section are connected to the optical transmission fiber such that the 2 nd incoherent light and the 2 nd second order excitation light propagate in opposite directions in the optical transmission fiber between the 1 st output section and the 2 nd output section,
in the optical transmission fiber between the 1 st output unit and the 2 nd output unit, the 2 nd incoherent light input is raman-amplified by the 2 nd order excitation light input thereto, and 2 nd order excitation light having a wavelength at which the signal light is raman-amplified is generated.
13. The light source system for Raman amplification according to any one of claims 10 to 12,
the plurality of incoherent light sources include an incoherent light source that includes a superluminescent light emitting diode and a semiconductor optical amplifier and is configured to optically amplify and output incoherent light output from the superluminescent light emitting diode by the semiconductor optical amplifier.
14. The light source system for Raman amplification according to any one of claims 10 to 12,
the plurality of excitation light sources include at least one of Fabry-Perot type semiconductor lasers having mutually different wavelengths, Fabry-Perot type semiconductor lasers, distributed feedback type semiconductor lasers, and distributed Bragg reflection type semiconductor lasers, each of which is formed by combining a Fabry-Perot type semiconductor laser and a fiber Bragg grating.
15. The light source system for Raman amplification according to any one of claims 10 to 12,
the plurality of incoherent light sources include incoherent light sources that output incoherent light of mutually different wavelength bands.
16. A Raman amplifier is provided with:
the light source for raman amplification according to any one of claims 1 to 9 or the light source system for raman amplification according to any one of claims 10 to 15; and
the optical transmission fiber.
17. A Raman amplification system is provided with:
the light source for raman amplification according to any one of claims 1 to 9 or the light source system for raman amplification according to any one of claims 10 to 15; and
the optical transmission fiber.
CN201680022816.1A 2015-05-13 2016-05-13 Raman amplification light source, Raman amplification light source system, Raman amplifier, and Raman amplification system Active CN107533270B (en)

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JP2015-210487 2015-10-27
PCT/JP2016/064337 WO2016182068A1 (en) 2015-05-13 2016-05-13 Light source for raman amplification, light source system for raman amplification, raman amplifier, raman amplifying system

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