WO2001089045A1 - Amplificateur a fibre dopee a un element des terres rares et a sources lumineuses de pompage, et amplificateur raman - Google Patents

Amplificateur a fibre dopee a un element des terres rares et a sources lumineuses de pompage, et amplificateur raman Download PDF

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Publication number
WO2001089045A1
WO2001089045A1 PCT/JP2001/004085 JP0104085W WO0189045A1 WO 2001089045 A1 WO2001089045 A1 WO 2001089045A1 JP 0104085 W JP0104085 W JP 0104085W WO 0189045 A1 WO0189045 A1 WO 0189045A1
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Prior art keywords
wavelength
light
pump
excitation
multiplexer
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PCT/JP2001/004085
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English (en)
Japanese (ja)
Inventor
Minoru Yoshida
Hisashi Sawada
Kazuo Imamura
Norio Naka
Yoshiyuki Imada
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Mitsubishi Cable Industries, Ltd.
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Application filed by Mitsubishi Cable Industries, Ltd. filed Critical Mitsubishi Cable Industries, Ltd.
Publication of WO2001089045A1 publication Critical patent/WO2001089045A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
    • H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • 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

Definitions

  • the present invention relates to a pumping light source, a rare-earth element doped fiber amplifier, and a Raman amplifier, and more particularly to a technical field of wavelength-multiplexing a plurality of pumping lights respectively output from a plurality of semiconductor lasers.
  • a rare earth element-doped fiber amplifier in which a rare earth element doped fino in which a core is doped with a rare earth element is used as an amplification medium to directly amplify an optical signal used for communication.
  • erbium is used in the core.
  • Erbium-doped fiber amplifiers (EDFAs) using doped erbium-doped fins (EDFs) exhibit excellent performance as optical amplifiers.
  • the rare earth element doped fiber amplifier combines an excitation light source having a semiconductor laser (LD) for outputting excitation light for exciting the rare earth element, an excitation light output from the excitation light source, and a signal light.
  • LD semiconductor laser
  • a pump light and a signal light multiplexer and the pump light and the signal light combined by the pump light and the signal light multiplexer are output to the rare earth element dope fiber, and the rare earth element is converted by the pump light.
  • the signal light is amplified by excitation.
  • a Raman amplifier that amplifies the signal light by using a Raman amplification fiber instead of the rare earth element doped fiber and exciting the Raman amplification fiber with the excitation light.
  • the pumping input is In order to increase the polarization, the two pump lights are polarized and multiplexed (polarization synthesis), and each of the polarized and multiplexed pump lights is output to the fiber. In order to further increase the pump input, a plurality of pump lights having different wavelengths are wavelength-multiplexed (wavelength combining) by a wavelength multiplexer, and each of the wavelength-multiplexed pump lights is output to a doped fiber. .
  • polarization-maintaining fiber when performing polarization multiplexing as described above, a polarization-maintaining fiber must be used, and fiber connection of polarization-type components requires rotation of the fiber to match the polarization plane. It requires advanced technology. In addition, an expensive polarization multiplexer with large insertion loss is required.
  • wavelength multiplexing when wavelength multiplexing is performed, it is easier than when polarization multiplexing is performed, but the wavelength of the excitation light deviates from the transmission wavelength of the wavelength multiplexer (the wavelength at which the insertion loss is minimized). Since the loss due to the wavelength multiplexer becomes large, it is necessary to match both.
  • the wavelength of the pump light output from the semiconductor laser changes depending on the temperature, drive current, and the like, it is necessary to match the wavelength of the pump light with the transmission wavelength of the wavelength multiplexer by using a semiconductor laser and a wavelength multiplexer.
  • a fiber Bragg grating is provided between each of the input terminals and the wavelength is fixed by reflecting only the wavelength corresponding to the transmission wavelength of the wavelength multiplexer to the semiconductor laser by this fiber Bragg grating. Need to be done, resulting in increased costs.
  • the reflection wavelength of the fiber Bragg grating and the transmission wavelength of the wavelength multiplexer also change with temperature, etc., and the wavelength of the pump light and the transmission of the wavelength multiplexer are changed. It is very difficult to reliably match the wavelength. Further, even if the loss due to the wavelength multiplexer is reduced by providing the fiber Bragg grating, the loss due to the fiber Bragg grating (about 0.2 to 0.5 dB) occurs. Therefore, there is a limit in improving the output of each wavelength-multiplexed pump light.
  • each channel of the wavelength multiplexer in order to increase the tolerance of the wavelength shift between the semiconductor laser and the wavelength multiplexer. It is necessary to increase the wavelength interval (wavelength difference between two adjacent pump lights) of each pump light to be waved.
  • the wavelength range suitable for the pumping is limited, and if the wavelength interval between the above-described pump lights becomes large, the efficiency deviates from the optimum excitation wavelength, resulting in a decrease in efficiency. I will.
  • An object of the present invention is to make the wavelength of each pump light and the transmission wavelength of a wavelength multiplexer coincide with a simple configuration when a plurality of pump lights output from a plurality of semiconductor lasers are wavelength-multiplexed. Accordingly, an object of the present invention is to improve the output of each wavelength-multiplexed pump light as much as possible.
  • a reflector is provided at an output side of a wavelength multiplexer to reflect a part of each pump light multiplexed by the wavelength multiplexer toward the wavelength multiplexer.
  • a plurality of semiconductor lasers respectively outputting a plurality of pumping lights, a plurality of pumping lights respectively outputted from the plurality of semiconductor lasers are inputted, and the inputted plurality of pumping lights are inputted.
  • a reflector is provided on the output side of the wavelength multiplexer to reflect a part of each of the pump lights wavelength-multiplexed by the wavelength multiplexer toward the wavelength multiplexer.
  • each of the wavelength-multiplexed pump lights is reflected by the reflector, so that laser light is oscillated between the reflector and the semiconductor laser via the wavelength multiplexer, and each pump light is
  • the wavelength is automatically fixed to the optimal wavelength determined by the transmission wavelength characteristics of the wavelength multiplexer (the most output can be extracted from the wavelength multiplexer) (the wavelength is pulled in).
  • the wavelength of the pump light and the transmission wavelength of the wavelength multiplexer can be matched irrespective of a temperature change or the like. Loss can be reduced.
  • the loss due to the reflector can be suppressed to a relatively small value by appropriately setting the reflectance of each excitation light. Therefore, the output of each wavelength-combined pump light can be improved as low cost as possible.
  • a plurality of pairs of semiconductor lasers each outputting a plurality of pump lights having two kinds of polarizations, each having a different polarization plane, and two kinds of different polarization planes respectively output from the respective pairs of semiconductor lasers.
  • Wavelength multiplexing that inputs pumping light and wavelength-multiplexes and outputs the inputted plurality of pumping lights.
  • a light source for excitation that outputs each pump light wavelength-multiplexed by the wavelength multiplexer.
  • Each of the wavelength-multiplexed wavelengths is output by the wavelength multiplexer to the output side of the wavelength multiplexer. It is assumed that a reflector for reflecting a part of the excitation light toward the wavelength multiplexer is provided.
  • each pair of semiconductor lasers outputs excitation light composed of two types of polarizations having different polarization planes, and these two types of excitation light are polarized and multiplexed by a polarization multiplexer.
  • the light is input to the wavelength multiplexer, the excitation lights of a plurality of wavelengths are wavelength-multiplexed and reflected by the reflector, and the respective excitation lights are determined by the transmission wavelength characteristics of the wavelength multiplexer in the same manner as described above.
  • the wavelength is fixed automatically.
  • an isolator to which each pump light wavelength-multiplexed by the wavelength multiplexer is input via an input fiber is connected to an output end of the wavelength multiplexer, and a reflector is connected to the isolators. It is provided at the excitation light emitting end of the input fiber in the section.
  • the module of each semiconductor laser that outputs pump light having a wavelength of 1.48 ⁇ m is usually provided with an isolator for preventing damage to the semiconductor laser due to external light.
  • an isolator having such a function can be integrated into one isolator provided on the output side of the wavelength multiplexer and having a reflector, thereby further reducing the cost.
  • the reflector can be easily provided only by coating the excitation light emitting end of the fiber with a dielectric multilayer film or the like, thereby facilitating the manufacture.
  • each semiconductor laser and the wavelength multiplexer are connected by a polarization-maintaining fiber.
  • the polarization planes of the two types of pump light for each wavelength are stably preserved by connecting the entire plane between each semiconductor laser and the isolator with a polarization-maintaining fiber.
  • the output of the pump light can be stably increased.
  • the output fluctuation of the polarization plane of the two types of pump light from the semiconductor laser can be controlled, only the polarization between the semiconductor laser and the wavelength multiplexer is maintained, as in the latter case. It is only necessary to connect with the existing fiber, and the system using the polarization-maintaining fiber can be simplified.
  • each pair of semiconductor lasers may have a polarization characteristic of non-polarization.
  • the output polarization of the excitation light can be automatically drawn in with respect to the light reflected by the reflector, and a complicated system using a polarization-maintaining fiber is not required.
  • the reflectance of each excitation light on the reflector is preferably set to 2 to 20%.
  • an excitation light source having any one of the above configurations, and an excitation light for multiplexing each excitation light and signal light output from the excitation light source are provided.
  • the rare earth element of the rare earth element fiber is It is assumed that the signal light is amplified by being excited by the excitation light.
  • a Raman amplifier a pumping light source having any one of the above configurations, and a pumping light / signal light multiplexer for multiplexing each pumping light and signal light output from the pumping light source And a Raman amplification fiber to which the pump light and the signal light multiplexed by the pump light / signal light multiplexer are input, and that the Raman amplification fiber is pumped by the pump light. It is assumed that the signal light is amplified. As a result, the same functions and effects as described above can be obtained, and the pumping input of the rare earth element-doped fiber amplifier or the fiber for Raman amplification can be increased.
  • a plurality of semiconductor lasers each outputting a plurality of pumping lights, a plurality of pumping lights respectively output from the plurality of semiconductor lasers are inputted, and the inputted plurality of pumping lights are wavelength-combined.
  • a wavelength multiplexer for multiplexing and outputting, and an excitation light source for outputting each excitation light wavelength-multiplexed by the wavelength multiplexer, each excitation light and signal light output from the excitation light source Multiplexed by the pump light / signal optical multiplexer and the above-described pump light / signal optical multiplexer.
  • the above-mentioned rare earth element doped fiber amplifier is provided with a part of each pump light on the transmission line of each wavelength multiplexed pump light between the pump light source and the rare earth element doped fiber. It is assumed that a reflector for reflecting light is provided on the side.
  • a plurality of semiconductor lasers each outputting a plurality of pumping lights, a plurality of pumping lights respectively output from the plurality of semiconductor lasers are inputted, and the plurality of inputted pumping lights are connected to each other.
  • each wavelength-multiplexed light between the light source for pumping and the fiber for Raman amplification is used.
  • each pump light It is assumed that a reflector for reflecting a part of the light toward the excitation light source is provided. As a result, the excitation input of the Raman amplification fiber can be increased as described above.
  • a plurality of pairs of semiconductor lasers each outputting a plurality of pump lights each having two types of polarizations having different polarization planes, and two types of pump lights each having a different polarization plane respectively output from each pair of semiconductor lasers
  • a plurality of polarization multiplexers for polarization-multiplexing and outputting the two types of input pump light, and a plurality of excitation lights respectively output from the plurality of polarization multiplexers.
  • the pump light and the signal light multiplexer which combine the pump light and the signal light output from the pump light source, and the pump light and the signal light multiplexed by the pump light and the signal light combiner are input.
  • a rare earth element doped fiber The rare earth element doped with the rare earth element of Iva is amplified by each of the above excitation lights to amplify the signal light.
  • a reflector that reflects a part of each pump light toward the pump light source is provided on the transmission path of each wavelength-multiplexed pump light between the pump light source and the rare-earth element doped fiber. Shall be provided.
  • a plurality of pairs of semiconductor lasers each outputting a plurality of pump lights having two types of polarizations, each having a different polarization plane, and two types of semiconductor lasers each having a different polarization plane respectively output from each pair of semiconductor lasers.
  • a plurality of polarization multiplexers for inputting the pump light and polarization-multiplexing and outputting the two types of input pump light, and a plurality of excitations respectively output from the plurality of polarization multiplexers
  • a wavelength multiplexer for inputting light, wavelength-multiplexing the plurality of input pump lights, and outputting the same, and outputting each pump light wavelength-multiplexed by the wavelength multiplexer.
  • Pump light and signal light multiplexer for multiplexing each pump light and signal light output from the excitation light source, and each pump light and signal light multiplexed by this pump light and signal light multiplexer.
  • a Raman amplification fiber to which the Raman amplification is input.
  • a Raman amplifier configured to amplify the signal light by being pumped by each pump light
  • a Raman amplifier is provided on a transmission path of each wavelength-multiplexed pump light between the pump light source and the Raman amplification fiber. It is assumed that a reflector that reflects a part of each of the excitation lights toward the excitation light source is provided.
  • the same effects as described above can be obtained, and the pumping input of the rare earth element doped fiber amplifier or the Raman amplification fino can be increased.
  • FIG. 1 is a schematic diagram showing an excitation light source according to Example 1 of the present invention and a rare earth element doped fiber amplifier using the excitation light source.
  • FIG. 2 is a schematic diagram showing the reflection isolator in detail.
  • FIG. 3 is a transmission wavelength characteristic diagram of the wavelength multiplexer.
  • FIG. 4 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention.
  • FIG. 5 is a diagram corresponding to FIG. 1 showing a third embodiment of the present invention.
  • FIG. 1 shows a pumping light source 1 according to Embodiment 1 of the present invention and a rare earth element doped fiber amplifier A using the pumping light source 1.
  • the pumping light source 1 outputs five pumping lights, respectively. (Laser diodes) and the five pumping lights output from the five semiconductor lasers 2, 2,..., Respectively.
  • a wavelength multiplexer 3 for multiplexing and outputting wavelengths.
  • the wavelength of each pumping light output from each of the semiconductor lasers 2 is, for example, 1.48 zm band (1.44 to 1.48 m) when the rare earth element doped fiber 13 described later is an erupium doped fiber.
  • the wavelength is about 1.5 ⁇ m) or 0.9 band
  • the transmission wavelength of the wavelength multiplexer 3 (the wavelength at which the insertion loss is minimized) is 1.48 / m
  • the transmission wavelength of the wavelength multiplexer 3 (the wavelength at which the insertion loss is minimized) is 1.48 / m
  • the transmission wavelength of the wavelength multiplexer 3 is 1.48 / m
  • Each of the semiconductor lasers 2 has a laser body chip, a lens, and the like, and is modularized.
  • the output end of the cleavage surface of the laser body chip may be left open. However, in order to ensure the wavelength pull-in described later and achieve higher output, it is preferable to apply a non-reflective coating so that the reflectance at the output end is 5% or less.
  • the output end of the wavelength multiplexer 3 is connected to a reflection isolator 5 to which each pump light wavelength-multiplexed by the wavelength multiplexer 3 is input via an input fiber 6.
  • the reflection isolator 5 has an input section 5a to which the above-mentioned wavelength-multiplexed pump lights are inputted, a non-reciprocal section 5b, and an output of each pump light. And an output unit 5c.
  • the input section 5a is connected to the pumping light emitting end of the input fiber 6, and converts each pumping light emitted from the pumping light emitting end into parallel light to be transmitted to the non-reciprocal section 5b.
  • An input side collimating lens 5 d is provided.
  • the output section 5c is provided with an output side collimating lens 5e for converging the parallel light passing through the non-reciprocal section 5b.
  • the excitation light incident ends of the two are arranged.
  • the output fiber 7 outputs the wavelength-multiplexed pump light as an output of the pump light source 1 to a pump light / signal optical multiplexer 11 described later.
  • the pumping light emitting end of the input fiber 6 a part of each pumping light wavelength-multiplexed by the wavelength multiplexer 3 is connected to the wavelength multiplexer 3 side.
  • a reflector 8 for reflecting light to the surface That is, the reflector 8 is provided on the output side of the wavelength multiplexer 3 in the excitation light source 1.
  • This reflector 8 is, specifically, It is composed of a dielectric multilayer film or a metal film coated on the excitation light emitting end of the input fiber 6, and the reflectance of each excitation light on the reflector 8 is set to 2 to 20%. .
  • the reflectance of each of the above-mentioned excitation lights is set to be ⁇ 20% or less of the average reflectance of all the excitation lights.
  • the reflectivity may be determined in consideration of the reflectivity of the output end of the laser body chip in each of the semiconductor lasers 2 so that the wavelength pull-in described later occurs.
  • the Fresnel reflection (reflectance of about 4%) may be used without coating the dielectric multilayer film or metal film on the light emitting end (in this case, the excitation light is emitted from the input cuff fiber 6). The end itself becomes the reflector 8).
  • Each pumping light output from the pumping light source 1 is converted into a communication signal input to the pumping light / signal light multiplexer 11 by the pumping light / signal light multiplexer 11 via the isolator 12. It is multiplexed (wavelength multiplexed) with light (for example, wavelength 1.55m band), and a rare earth element (Er (amplification of 1.55m band signal light), Pr (1.3 / m band signal light amplification), Yb (1.05 1m band signal light amplification), Nd (1.06 ⁇ m band signal light amplification), etc.) Fiber 13.
  • the rare-earth element doped fiber 13 receives the multiplexed pump light and signal light, and amplifies the signal light by exciting the rare-earth element with each of the pump lights.
  • the signal light amplified by the rare earth element doped fiber 13 is output as an output of the rare earth element doped fiber amplifier A via the isolator 14.
  • the isolators 12 and 14 are provided to remove laser oscillation and reflected return light in the rare-earth element-doped fiber 13.
  • Each pumping light output from each semiconductor laser 2 of the pumping light source 1 is wavelength-multiplexed by the wavelength multiplexer 3, and Each of the wavelength-multiplexed pump lights is input to the reflection isolator 5 via the input fiber 6. At this time, a part of each pump light is reflected to the wavelength multiplexer 3 side by the reflector 8 provided at the pump light output end of the input fiber 6, so that the reflector 8 passes through the wavelength multiplexer 3.
  • each of the wavelength-multiplexed pump lights is output from the pump light source 1 through the reflection isolator 5 and the output fiber 7, and is combined with the signal light by the pump light / signal light multiplexer 11. Waved.
  • the multiplexed pump light and signal light are input to the rare earth element doped fiber 13, and the respective excited lights excite the rare earth element in the core of the rare earth element doped fiber 13.
  • the signal light is amplified by the stimulated emission phenomenon of the excited rare earth element ions, and the amplified signal light is output as an output of the rare earth element doped fiber amplifier A via the isolator 14.
  • the reflector 8 is provided on the output side of the wavelength multiplexer 3 in the activation light source 1, a fiber Bragg grating is provided between each semiconductor laser 2 and the wavelength multiplexer 3. Even if the wavelength is not fixed, the wavelength of each pump light and the transmission wavelength of the wavelength multiplexer 3 can be matched with a simple configuration regardless of a temperature change or the like. Further, since the reflectance of each excitation light in the reflector 8 is set to 2 to 20%, the loss due to the reflector 8 can be suppressed to a considerably small value.
  • each channel of the wavelength multiplexer 3 it is not necessary to increase the transmission wavelength width of each channel of the wavelength multiplexer 3, and the wavelength interval (the wavelength difference between two pump lights having adjacent wavelengths) of each pump light output from each semiconductor laser 2 is not required. It can be made as small as possible (for example, to about 0.005), and the wavelength of each pumping light can be concentrated in an extremely narrow wavelength range optimal for pumping the rare earth element doped fiber 13. Therefore, the output of each wavelength-multiplexed pump light can be maximized, and the pump input of the rare-earth element doped fiber 13 can be increased.
  • the reflector 8 is provided at the pumping light emitting end of the input fiber 6 at the input section 5a of the reflecting isolator 5, a diode for preventing damage to the semiconductor laser 2 due to external light is provided. It is not necessary to provide each of the semiconductor lasers 2, and one reflection isolator 5 can be used. Moreover, the reflector 8 can be easily provided by coating a dielectric multilayer film or the like on the excitation light emitting end of the input fiber 6.
  • the reflector 8 is provided at the pumping light emitting end of the input fiber 6 in the reflecting isolator 5 of the pumping light source 1, but the wavelength of each pumping light is 0.9981! 1 band.
  • the wavelength instead of providing the reflection isolator 5, a simple reflector may be provided as the reflector 8 at the output end or the output side of the wavelength multiplexer 3.
  • FIG. 4 shows a second embodiment of the present invention (in the following embodiments, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted).
  • the pumping light source 1 is provided with the reflector 8, while the pumping light wavelength-multiplexed between the pumping light source 1 and the rare-earth element-doped fiber 13 is provided.
  • a reflector 8 is provided on the transmission path of the first embodiment, and a part of each excitation light is reflected to the excitation light source 1 side.
  • the reflection isolator 5 (having the input and output fibers 6 and 7 and the reflector 8 provided at the pumping light emitting end of the input fiber 6) in the first embodiment is used as the pumping light signal.
  • the output of the wavelength multiplexer 3 is used as the output of the excitation light source 1, and the output of the excitation light / signal optical multiplexer 11 is passed through the reflection isolator 5. Instead of direct input.
  • the reflector 8 reflects only each excitation light and does not reflect the signal light (while reflecting a part of the wavelength of each excitation light, On the other hand, it has the property of transmitting almost all of them).
  • the isolator 12 in the first embodiment can be used also as the reflective isolator 5 and is unnecessary.
  • FIG. 5 shows Embodiment 3 of the present invention, in which polarization multiplexing is performed in addition to wavelength multiplexing of pump light.
  • the pumping light source 1 is not provided with the five semiconductor lasers 2, 2,... For respectively outputting five pumping lights having different wavelengths as in the first embodiment. Instead, each of them is a combination of a pair of semiconductor lasers 2a, 2b, and a total of 10 (5 pairs) semiconductor lasers 2a, 2b, 2a, 2b, ... are provided.
  • Each pair of the two semiconductor lasers 2a and 2b has one wavelength composed of two kinds of polarizations having different polarization planes (for example, 1.46 ⁇ m, 1.465zm, 1.47zm, 1.475 m (one of 48 m)
  • Each output end is connected to a polarization multiplexer 17 via a polarization-maintaining fiber 16a, 16b (PMF).
  • PMF polarization-maintaining fiber 16a, 16b
  • two types of pump light with different polarization planes output from each pair of semiconductor lasers 2a and 2b are input, and the two types of input pump light are polarized and multiplexed and output. It has become.
  • each pumping light wavelength-multiplexed by the wavelength multiplexer 3 is connected to a reflection isolator which is input via a polarization-maintaining fiber 19. 5 is connected.
  • This reflection isolator 5 has a reflector 8 at the exit end of the excitation light of the polarization-maintaining fiber 19 as in the first embodiment (see FIG. 2), and its output section includes an output fiber 7.
  • the pump light and the signal light multiplexer 11 are connected via the.
  • the pumping light / signal light multiplexer 11 and the rare earth element doped fiber 13 are connected via an isolator 20.
  • Other configurations are the same as those of the first embodiment (see FIG. 1).
  • pumping light composed of two types of polarizations having different polarization planes and the same wavelength is output from each pair of semiconductor lasers 2a and 2b.
  • the polarization multiplexer 17 After being polarized and multiplexed by the polarization multiplexer 17, they are input to one wavelength multiplexer 3.
  • this wavelength multiplexer 3 after the excitation lights of five wavelengths are multiplexed with each other, they are reflected by the reflector 8 of the reflection isolator 5, and each excitation light has the same wavelength as in the first embodiment.
  • the wavelength is automatically fixed to the optimum wavelength determined by the transmission wavelength characteristic of the multiplexer 3.
  • the output of the pumping light can be increased, and the output can be substantially doubled as compared with the case of only the wavelength multiplexing.
  • the semiconductor lasers 2a, 2b and the reflection isolator 5 specifically, between each of the semiconductor lasers 2a, 2b and the polarization multiplexer 17, Polarization-preserving figures 16 a, 16 b, 18, and 19 both between the wavelength multiplexer 17 and the wavelength multiplexer 3 and between the wavelength multiplexer 3 and the reflection isolator 5.
  • each of the semiconductor lasers 2a and 2b and the reflection isolator 3 are connected by the polarization maintaining fiber 16a, 16b, 18 and 19.
  • the output fluctuations of the polarization planes of the two types of pump light from each of the semiconductor lasers 2a and 2b can be adjusted by electric feedback control for the drive pumps of the semiconductor lasers 2a and 2b.
  • each pair of semiconductor lasers 2a and 2b is used whose polarization characteristic is non-polarized, the whole from each semiconductor laser 2a and 2b to the reflection isolator 5 is used.
  • a complex system that uses polarization-maintaining fiber that can be connected by an optical fiber that is not a polarization-maintaining fiber and that automatically pulls in the output polarization of the pump light in response to the reflected light from the reflector 8. Becomes unnecessary.
  • each semiconductor laser 2 is a pair of semiconductor lasers 2 each of which outputs pump light composed of two kinds of polarized waves having different polarization planes.
  • they may be connected by a polarization multiplexer, and a plurality of polarization multiplexers may be connected to one wavelength multiplexer 11.
  • Rare-earth element-doped fino It is possible to increase the excitation input of the amplifier.
  • the rare-earth element doped fiber amplifier A has been described.
  • the present invention can be applied to a Raman amplifier. That is, a Raman amplification fiber is used in place of the rare earth-doped fiber 13 described above, and the other configuration may be the same as that of the rare earth-doped fiber amplifier A.
  • the Raman scattering is performed by being pumped by the pumping light. Then, the signal light may be amplified by the Raman scattering.
  • the present invention relates to a case where a plurality of pump lights output from a plurality of semiconductor lasers are wavelength-multiplexed and output to a rare-earth element doped fino amplifier or a fiber for Raman amplification, and are combined with signal light by a pump light / signal light multiplexer.
  • the output of each wavelength-multiplexed pump light can be improved by using a simple configuration to match the wavelength of each pump light with the transmission wavelength of the wavelength multiplexer, and amplify the rare earth element doped fiber amplifier and Raman amplifier. Its industrial applicability is high in that it can promote an increase in output.

Abstract

Lorsqu'une pluralité de lumières de pompage émises respectivement par une pluralité de lasers semi-conducteurs (2, 2, ) sont multiplexées en longueur d'onde par un multiplexeur (3) en longueur d'onde, un réflecteur (8), destiné à réfléchir une partie de chaque lumière de pompage multiplexée en direction du multiplexeur (3), est prévu du côté sortie du multiplexeur (3) afin de renforcer au maximum la sortie de chaque lumière de pompage multiplexée en longueur d'onde par la mise en correspondance, au moyen d'un dispositif simple, de la longueur d'onde de chaque lumière de pompage avec la longueur d'onde de transmission du multiplexeur (3). Plus spécifiquement, un isolateur (5) de réflexion, recevant par une fibre d'entrée (6) chaque lumière de pompage multiplexée par le multiplexeur (3), est connecté à l'extrémité de sortie du multiplexeur (3) ; et le réflecteur (8), qui comprend un film multicouches diélectrique, est prévu à l'extrémité de sortie de lumière de pompage de la fibre d'entrée (6), dans la partie d'entrée (5a) de l'isolateur (5) de réflexion.
PCT/JP2001/004085 2000-05-19 2001-05-16 Amplificateur a fibre dopee a un element des terres rares et a sources lumineuses de pompage, et amplificateur raman WO2001089045A1 (fr)

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Publication number Priority date Publication date Assignee Title
US6697187B2 (en) * 2001-06-05 2004-02-24 Nortel Networks Limited Method and apparatus for Raman amplifier gain control
KR100440568B1 (ko) * 2001-11-28 2004-07-21 한국전자통신연구원 광대역 광링크 제어장치

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JPS62229891A (ja) * 1986-03-29 1987-10-08 Nippon Telegr & Teleph Corp <Ntt> 多波長半導体光源
JPH11145541A (ja) * 1997-09-12 1999-05-28 Samsung Electron Co Ltd 光繊維増幅のための高電力ポンピング装置
JPH11186642A (ja) * 1997-12-25 1999-07-09 Nec Corp 光増幅器
JPH11266047A (ja) * 1998-03-17 1999-09-28 Fujitsu Ltd 光増幅器及び該光増幅器を備えたシステム
JP2000098433A (ja) * 1998-07-23 2000-04-07 Furukawa Electric Co Ltd:The ラマン増幅器とそれを用いた光中継器
JP2000232248A (ja) * 1999-02-10 2000-08-22 Fujikura Ltd 多波長励起光合波用デバイスおよびこの多波長励起光合波用デバイスを組み込んだ多波長励起用光源と光増幅器
JP2001117126A (ja) * 1999-08-06 2001-04-27 Nippon Telegr & Teleph Corp <Ntt> ラマン増幅器及びそれを用いた光ファイバ通信システム

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JPS62229891A (ja) * 1986-03-29 1987-10-08 Nippon Telegr & Teleph Corp <Ntt> 多波長半導体光源
JPH11145541A (ja) * 1997-09-12 1999-05-28 Samsung Electron Co Ltd 光繊維増幅のための高電力ポンピング装置
JPH11186642A (ja) * 1997-12-25 1999-07-09 Nec Corp 光増幅器
JPH11266047A (ja) * 1998-03-17 1999-09-28 Fujitsu Ltd 光増幅器及び該光増幅器を備えたシステム
JP2000098433A (ja) * 1998-07-23 2000-04-07 Furukawa Electric Co Ltd:The ラマン増幅器とそれを用いた光中継器
JP2000232248A (ja) * 1999-02-10 2000-08-22 Fujikura Ltd 多波長励起光合波用デバイスおよびこの多波長励起光合波用デバイスを組み込んだ多波長励起用光源と光増幅器
JP2001117126A (ja) * 1999-08-06 2001-04-27 Nippon Telegr & Teleph Corp <Ntt> ラマン増幅器及びそれを用いた光ファイバ通信システム

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6697187B2 (en) * 2001-06-05 2004-02-24 Nortel Networks Limited Method and apparatus for Raman amplifier gain control
KR100440568B1 (ko) * 2001-11-28 2004-07-21 한국전자통신연구원 광대역 광링크 제어장치

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