WO2014101427A1 - 多波长光源装置 - Google Patents

多波长光源装置 Download PDF

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Publication number
WO2014101427A1
WO2014101427A1 PCT/CN2013/080962 CN2013080962W WO2014101427A1 WO 2014101427 A1 WO2014101427 A1 WO 2014101427A1 CN 2013080962 W CN2013080962 W CN 2013080962W WO 2014101427 A1 WO2014101427 A1 WO 2014101427A1
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Prior art keywords
wavelength
light source
source device
erbium
optical
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PCT/CN2013/080962
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English (en)
French (fr)
Inventor
代溪泉
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华为技术有限公司
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Priority to JP2014553611A priority Critical patent/JP2015504612A/ja
Priority to EP13785335.4A priority patent/EP2816746A4/en
Priority to US14/106,175 priority patent/US20140185131A1/en
Publication of WO2014101427A1 publication Critical patent/WO2014101427A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/506—Multiwavelength transmitters
    • 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
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0078—Frequency filtering
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06758—Tandem amplifiers
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06795—Fibre lasers with superfluorescent emission, e.g. amplified spontaneous emission sources for fibre laser gyrometers
    • 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
    • H01S2301/00—Functional characteristics
    • H01S2301/04—Gain spectral shaping, flattening
    • 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
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0064—Anti-reflection devices, e.g. optical isolaters
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06762—Fibre amplifiers having a specific amplification band
    • H01S3/06766—C-band amplifiers, i.e. amplification in the range of about 1530 nm to 1560 nm
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06762—Fibre amplifiers having a specific amplification band
    • H01S3/0677—L-band amplifiers, i.e. amplification in the range of about 1560 nm to 1610 nm
    • 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
    • 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
    • H01S3/094061—Shared pump, i.e. pump light of a single pump source is used to pump plural gain media in parallel
    • 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
    • H01S3/0941—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
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
    • 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
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1608—Solid materials characterised by an active (lasing) ion rare earth erbium
    • 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
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2308—Amplifier arrangements, e.g. MOPA
    • H01S3/2325—Multi-pass amplifiers, e.g. regenerative amplifiers
    • H01S3/2333—Double-pass amplifiers

Definitions

  • Multi-wavelength light source device The present application claims priority to Chinese Patent Application No. 201210587190.2, entitled “Multi-wavelength Light Source Device”, filed on December 28, 2012, the entire contents of which is incorporated herein by reference. .
  • the present invention relates to the field of optical communications, and more particularly to a multi-wavelength light source device in the field of optical communications. Background technique
  • Wavelength-Division Multiplexing passive optical network
  • PON Passive Optical Network
  • DWDM Density Wavelength-Division Multiplexing
  • the multi-wavelength light source device mainly adopts a Super Luminescent Diode/Super-Luminescent Light Emitting Diode (SLD/SLED), and an Erbium Doped Fiber Amplified Spontaneous Emission (abbreviation). Implemented as an "EDF-ASE” or Distributed Feedback Laser (“DFB”) array.
  • SLD/SLED Super Luminescent Diode/Super-Luminescent Light Emitting Diode
  • abbreviation Erbium Doped Fiber Amplified Spontaneous Emission
  • the SLD/SLED can emit a wide-spectrum optical signal that meets the requirements of a certain wavelength range, but the SLD/SLED is a signal light source carrying modulated data, and there is a defect that the optical power is small in a unit wavelength, and the transmitted wide-spectrum optical signal It also has a certain polarization state, which is inconvenient for subsequent use.
  • Erbium-doped fiber spontaneous emission source (EDF-ASE) is based on an erbium-doped fiber-based spontaneous emission source, using an Erbium Doped Fiber Amplifier (EDFA) to emit a broad-spectrum optical signal, and can pass different ⁇ Fiber selection and pumping to achieve spontaneous emission in the C-band and L-band.
  • EDF-ASE Erbium-doped fiber spontaneous emission source
  • EDFA Erbium Doped Fiber Amplifier
  • the luminous power of the EDF-ASE source is much higher than that of the SLD, the spectral width of the optical signal emitted by the EDF-ASE is wide, and the useful wavelength component only accounts for a small portion of the total spectrum, resulting in a unit.
  • the useful optical power is small and inconvenient to use.
  • the DFB array uses a plurality of DFB lasers to form a laser array to provide multiple wavelengths required. Each single wave has good monochromaticity and high power.
  • the DFB array requires complex wavelength temperature control, which is difficult to align and cost, and the DFB array also has a polarization state.
  • the present invention provides a multi-wavelength light source device having a concentrated spectral energy and a simple structure.
  • an embodiment of the present invention provides a multi-wavelength light source device, and the multi-wavelength light source device
  • the method includes: a pumping light source for providing pump light; an erbium-doped fiber for absorbing the energy of the pumping light to emit a broad-spectrum laser; an optical filter for filtering the broad-spectrum laser, and outputting the optical a multi-wavelength optical signal in a free spectral range of the filter; wherein the multi-wavelength optical signal is incident on the erbium-doped fiber, and the erbium-doped fiber is further used to re-amplify the incident multi-wavelength optical signal for output.
  • the multi-wavelength light source device further includes: a gain flattening filter, configured to filter the multi-wavelength optical signal output by the optical filter, and filter the multi-wavelength The optical signal is output to the erbium doped fiber for amplification again.
  • a gain flattening filter configured to filter the multi-wavelength optical signal output by the optical filter, and filter the multi-wavelength The optical signal is output to the erbium doped fiber for amplification again.
  • the multi-wavelength light source device further includes: a gain flattening filter, configured to filter the multi-wavelength optical signal outputted by the erbium-doped fiber again.
  • the erbium doped fiber comprises a first erbium doped fiber and a second erbium doped An optical fiber, wherein the first doped fiber is disposed between the pumping source and the optical filter for generating the wide-spectrum laser; and the second doped fiber is used for outputting the multi-wavelength light to the optical filter The signal is amplified again and output.
  • the multi-wavelength light source device further includes: an optical splitter, a pump for transmitting the pumping light source Puguang is divided into two parts, the first part of the pump light is incident on the first doped fiber, and the second part of the pump light is incident on the second fiber; the first wavelength division multiplexer is used for the second Part of the pump light and the multi-wavelength optical signal output by the optical filter are combined and incident on the second doped fiber.
  • the multi-wavelength light source device further includes: a first optical isolator disposed on the optical filter and the first Between a wavelength division multiplexer; a second optical isolator disposed between the second doped fiber and the output of the multi-wavelength light source device.
  • the multi-wavelength light source device further includes a second wavelength division multiplexer and a reflector, wherein the pump light emitted by the pump source is incident on the doped fiber through the second wavelength division multiplexer, and the multi-wavelength optical signal output by the optical filter is reflected back to the light by the reflector
  • the bait fiber is amplified by the erbium doped fiber and output through the second wavelength division multiplexer.
  • the multi-wavelength light source device further includes: a third optical isolator disposed in the second wavelength division multiplexing Between the output of the multi-wavelength source device.
  • the pumping source is a pump laser
  • the pump laser provides pump light with a center wavelength of 980 nm.
  • the optical filter is Fabry - Perot filter.
  • the multi-wavelength optical signal has a wavelength In the range of 1528 nm to 1565 nm, or in the range of 1565 nm to 1625 nm.
  • the multi-wavelength light source device of the embodiment of the present invention can selectively output an optical signal having a desired wavelength through an optical filter, and re-amplify by inputting the optical signal into the erbium-doped optical fiber, so that the output light is The spectral energy is concentrated, and the power of the output light can be increased.
  • the multi-wavelength light source device of the embodiment of the invention has the characteristics of polarization insensitivity, simple structure and low cost.
  • FIG. 1 is a schematic block diagram of a multi-wavelength light source device in accordance with an embodiment of the present invention.
  • FIG. 2 is another schematic block diagram of a multi-wavelength light source device in accordance with an embodiment of the present invention.
  • FIG. 3 is still another schematic block diagram of a multi-wavelength light source device in accordance with an embodiment of the present invention.
  • FIG. 4 is a schematic block diagram of a cascade type multi-wavelength light source device according to an embodiment of the present invention.
  • 5A and 5B are another schematic block diagrams of a cascade type multi-wavelength light source device according to an embodiment of the present invention.
  • FIG. 6 is a schematic block diagram of a reflective multi-wavelength light source device in accordance with an embodiment of the present invention.
  • FIG. 7A and 7B are another schematic block diagrams of a reflective multi-wavelength light source device in accordance with an embodiment of the present invention.
  • a radio access network radio Access
  • WDM-PON Wavelength-Division Multiplexing-Passive Optical Network
  • DWDM Density Wavelength-Division Multiplexing
  • Optical Transport Network abbreviation
  • C-RAN Cloud Radio Access Network
  • the embodiment of the present invention is only described by taking an optical communication application scenario as an example, but the embodiment of the present invention is not limited thereto, and the multi-wavelength light source device according to the embodiment of the present invention may also be applied to other applications requiring a multi-wavelength light source device. Scenes.
  • Fig. 1 shows a schematic block diagram of a multi-wavelength light source device 10 in accordance with an embodiment of the present invention.
  • the multi-wavelength light source device 10 includes: a pumping light source 11, an erbium doped fiber 12, and an optical filter 13, wherein the pumping light source 11 is used to provide pumping light; and the erbium doped fiber 12 is used for Absorbing energy of the pump light to emit a broad-spectrum laser; the optical filter 13 is configured to filter the broad-spectrum laser and output a multi-wavelength optical signal in a free spectral range of the optical filter 13;
  • the wavelength optical signal is incident on the erbium doped fiber 12, and the erbium doped fiber 12 is further used to re-amplify the incident multi-wavelength optical signal for output.
  • the pump light output from the pumping light source 11 is incident on the erbium-doped fiber 12, and the erbium ions in the erbium-doped fiber 12 absorb the energy of the pump light and are pumped to a higher energy level to generate spontaneous radiation.
  • the multi-wavelength light source device of the embodiment of the present invention can selectively output an optical signal having a desired wavelength through an optical filter, and re-amplify the optical signal by injecting the optical signal into the erbium-doped fiber, so that the spectral energy of the output light is concentrated. And the power of the output light can be increased.
  • the multi-wavelength light source device of the embodiment of the invention has the characteristics of polarization insensitivity, simple structure and low cost.
  • a broad-spectrum laser including a desired wavelength can be generated.
  • the concentration of cerium ions can be set to 400 ppm (parts per million) to 600 ppm; for erbium-doped fibers for L-band, the concentration of cerium ions can be set to more than 1000 ppm. .
  • the C-band or the L-band conforms to the relevant standards defined by the International Telecommunication Union (“ITU") Telecommunication Standardization Organization (ITU-T).
  • ITU International Telecommunication Union
  • the C-band can refer to an optical signal having a wavelength in the range of 1528 nm to 1565 nm
  • the L-band can refer to an optical signal having a wavelength in the range of 1565 nm to 1625 nm.
  • the pumping source 11 is a pumping laser that provides pump light having a center wavelength of 980 nanometers. That is, the wavelength or center wave of the pump light output from the pumping light source 11 is a 980 nanopulse laser and a 980 nm pump laser. It should be understood that
  • the optical filter 13 is a Fabry-Perot etalon filter.
  • the Fabry-Perot filter can also be called a Fabry-Perot etalon filter, or FP filter.
  • the Free Spectral Range ("FSR") of the optical filter 13 can be designed to conform to the ITU-T defined wavelength point. Of course, it can also be designed to meet other required wavelengths.
  • the free optical range FSR of the optical filter 13 is 50 GHz or 100 GHz. It should be understood that in the embodiment of the present invention, the desired frequency interval FSR can be designed by selecting the refractive index of the FP resonator of the Fabry-Perot filter and the length of the FP resonator.
  • the FP resonator is an air medium, that is, the FP resonator has a refractive index of 1, then: If a FP filter with a frequency interval of 50 GHz is to be designed, the length of the FP resonator can be designed. It is 2.979792458mm; if a FP filter with a frequency interval of 100GHz is to be designed, the length of the FP resonator can be designed to be 1.498926229mm.
  • the optical filter may have other free spectral ranges depending on the application, and may also use a filter other than the FP filter that can selectively output an optical signal within a specific frequency interval or FSR.
  • the example is not limited to this.
  • the multi-wavelength optical signal has a wavelength in the range of 1528 nm to 1565 nm, or in the range of 1565 nm to 1625 nm. That is, in the embodiment of the present invention, the doping concentration of the erbium ions in the erbium-doped fiber can be selected, and the free spectral range of the optical filter can be determined, so that the wavelength of the optical signal output by the multi-wavelength light source device can be mainly from 1528 nm to 1565. In the range of nanometers, or in the range of 1565 nm to 1625 nm.
  • the multi-wavelength light source device 10 further includes: a gain flattening filter 14 for filtering the multi-wavelength optical signal output by the optical filter 13, and The filtered multi-wavelength optical signal is output to the erbium doped fiber 12 for amplification again.
  • the gain flattening filter 14 may be disposed between the erbium-doped fiber 12 and the output end of the multi-wavelength light source device 10, and the multi-wavelength optical signal outputted by the erbium-doped fiber 12 is amplified again.
  • the gain flattening filter 14 is filtered again and output to equalize the power between the respective wavelengths output by the multi-wavelength light source device 10, so that the spectral energy of the output light of the multi-wavelength light source device 10 is more uniform and concentrated.
  • the multi-wavelength light source device 10 further includes: a gain flattening filter 14 for multi-wavelength optical signals outputted after being amplified by the erbium doped fiber 12 again. Filtering is performed.
  • a gain flattening filter 14 may be disposed between the optical filter 13 and the erbium doped fiber 12 for filtering the multi-wavelength optical signal output by the optical filter 13, and will pass through
  • the multi-wavelength optical signal filtered by the optical filter 13 is output to the erbium doped fiber 12 for re-amplification to equalize the power between the respective wavelengths output by the multi-wavelength light source device 10, so that the spectral energy of the output light of the multi-wavelength light source device 10 is more Both are more concentrated.
  • the gain flattening filter 14 can be used to filter the multi-wavelength optical signal output by the optical filter 13, and output the filtered multi-wavelength optical signal to the erbium-doped fiber 12.
  • the amplification is performed again, and can also be used to filter the multi-wavelength optical signal outputted by the erbium-doped fiber 12 again.
  • the gain flattening filter may be disposed at other positions to equalize the power between the respective wavelengths, and the embodiment of the present invention is not limited thereto.
  • the multi-wavelength light source device of the embodiment of the present invention can selectively output an optical signal having a desired wavelength through an optical filter, and re-amplify the optical signal by injecting the optical signal into the erbium-doped fiber, so that the spectral energy of the output light is concentrated. It is uniform and can increase the power of the output light.
  • the multi-wavelength light source device of the embodiment of the invention has the characteristics of polarization insensitivity, simple structure and low cost.
  • the cascading structure or the reflection type structure may be used, and the multi-wavelength optical signal output from the optical filter is incident on the erbium-doped fiber, and amplified and output.
  • a cascade type multi-wavelength light source device and a reflection type multi-wavelength light source device according to an embodiment of the present invention will be described in detail below with reference to Figs. 4 to 7B, respectively.
  • the erbium-doped fiber 12 includes a first erbium-doped fiber 15 and a second erbium-doped fiber 16, wherein the first erbium-doped fiber 15 is disposed in the pump.
  • the second light-doped optical fiber 16 is used to re-amplify the multi-wavelength optical signal output from the optical filter 13 and output the light source 11 and the optical filter 13.
  • first and second are merely used to refer to different devices, and should not be limited to the number or function of the device, for example, the first erbium-doped fiber or the first Both erbium-doped fibers may include one or more erbium doped fibers.
  • re-amplification of the multi-wavelength optical signal can be achieved by at least two erbium-doped optical fibers to concentrate the spectral energy and increase the output power.
  • the multi-wavelength light source device 10 further includes:
  • An optical splitter configured to divide the pump light emitted by the pump light source into two parts, the first part of the pump light is incident on the first fiber, and the second part of the pump light is incident on the second fiber ;
  • a first wavelength division multiplexer for combining the second partial pump light and the multi-wavelength optical signal output by the optical filter, and incident on the second doped fiber.
  • the multi-wavelength light source device 100 includes: a pump laser 101, an optical splitter 102, an erbium doped fiber 103 (ie, a first erbium doped fiber), an FP filter 104, a gain flattening filter 105, A wavelength division multiplexer 107 (i.e., a first wavelength division multiplexer) and an erbium doped fiber 108 (i.e., a second erbium doped fiber).
  • the pump laser 101 can emit pump light of about 980 nm, and the power of the pump light can be between 150 mW and 500 mW.
  • the pump light can be divided into two parts by the optical splitter 102, and the two parts are pump light. They can be implanted into erbium-doped fibers (EDF) 103 and 108, respectively.
  • EDF erbium-doped fibers
  • the optical splitter 102 has an operating wavelength range of 960 nm to 990 nm, and the split ratio is, for example, 50%.
  • the erbium ions in the erbium fiber absorb the energy of the pump light and are pumped to a higher energy level, followed by spontaneous emission (ASE) to produce a broad-spectrum laser, which can include the C-band (1528 nm).
  • ASE spontaneous emission
  • the broad spectrum laser can be filtered by a Fabry-Perot etalon filter 104 having, for example, an FSR of 50 GHz or 100 GHz, having an operating wavelength range of, for example, 1520 nm to 1630 nm.
  • the multi-wavelength optical signal outputted by the FP filter 104 and a part of the pump light split by the optical splitter 102 can be combined by the wavelength division multiplexer 107 and incident on the doped fiber 108 for re-amplification. It can boost the power of the output light and concentrate the energy to the useful band.
  • the multi-wavelength optical signal filtered out by the FP filter 104 may be first filtered by a Gain Flatness Filter (GFF) 105 to achieve power balance between the wavelengths, and
  • GFF Gain Flatness Filter
  • the multi-wavelength optical signal filtered by the gain flattening filter 105 and a part of the pump light split by the optical splitter 102 can be combined by the wavelength division multiplexer 107 and incident on the doped optical fiber 108 for amplification again. , thereby increasing the power of the output light and concentrating the energy into the useful band.
  • the multi-wavelength light source device 10 further includes:
  • a first optical isolator disposed between the optical filter and the first wavelength division multiplexer
  • a second optical isolator is disposed between the second doped fiber and the output of the multi-wavelength source device.
  • the multi-wavelength light source device 100 may further include: an optical isolator 106 (ie, a first optical isolator) and an optical isolator 109 (ie, a second optical isolator), and the optical isolators 106 and 109 are used. Isolation of the optical signal in the optical path to prevent reflection of the optical signal. It should be understood that, in the embodiment of the present invention, a plurality of optical isolators may be disposed to prevent reflection of optical signals in the optical path, and embodiments of the present invention are not limited thereto.
  • Fig. 5B shows the connection between the optical elements of the cascade type multi-wavelength light source device 100 according to an embodiment of the present invention.
  • 110 to 118 show the fiber fusion splice points between the optical elements, specifically, 110 is the fiber fusion splice point between the pump laser 101 and the optical splitter 102; 111 is the optical splitter The fiber fusion splice point between 102 and the erbium doped fiber 103; 112 is the fiber fusion splice point between the erbium doped fiber 103 and the FP filter 104; 113 is the fiber fusion splice point between the FP filter and the gain flattening filter 105; The fiber fusion splice point between the gain flattening filter 105 and the optical isolator 106; 115 is the fiber fusion splice point between the optical isolator 106 and the wavelength division multiplexer 107; 116 is the optical splitter 102 and wavelength division multiplexing The fiber fusion splice points between
  • connections between the components shown in FIG. 5B are for illustrative purposes only, and that the components may have fiber fusion splices at other locations, or have other fiber splice points and structures, and embodiments of the present invention are not limited thereto. this.
  • the multi-wavelength light source device of the embodiment of the present invention can select an output device through an optical filter.
  • a light signal of a desired wavelength is obtained, and the light signal is incident on the erbium-doped fiber for re-amplification, so that the spectral energy of the output light is concentrated, and the power of the output light can be increased; in addition, the multi-wavelength of the embodiment of the present invention
  • the light source device is also characterized by polarization insensitivity, simple structure, and low cost.
  • the cascading type multi-wavelength light source device has been described in detail above with reference to FIG. 4 to FIG. 5B.
  • a reflective multi-wavelength light source device according to an embodiment of the present invention will be described with reference to FIGS. 6 to 7B. Describe.
  • the reflective multi-wavelength light source device 10 further includes a second wavelength division multiplexer 17 and a reflector 18, wherein the pump light emitted by the pump light source 11 passes through the second
  • the wavelength division multiplexer 17 is incident on the doped fiber 12, and the multi-wavelength optical signal outputted by the optical filter 13 is reflected back to the optical doped fiber 12 through the reflector 18, and amplified again by the erbium doped fiber 12. It is output by the second wavelength division multiplexer 17.
  • the reflector 18 is, for example, a mirror, or other device having a reflective characteristic
  • the operating wavelength of the reflector 18 is, for example, in the range of 1500 nm to 1700 nm
  • the reflectance of the reflector 18 is, for example, 100%.
  • the multi-wavelength light source device 10 further includes: a third optical isolator disposed between the second wavelength division multiplexer and an output end of the multi-wavelength light source device, The optical signals in the optical path are isolated to prevent reflection of optical signals.
  • first optical isolator, the second optical isolator or the third optical isolator may comprise one or more optical isolators; it is also understood that other components of the multi-wavelength light source device according to embodiments of the present invention are There may also be optical isolators, and embodiments of the invention are not limited thereto.
  • the multi-wavelength light source device 200 includes: a pump laser 201, a mirror 202, an FP filter 203, an erbium doped fiber 204, a wavelength division multiplexer 205, a gain flattening filter 206, and an optical isolator 207. .
  • the pump laser 201 can emit pump light power of about 980 nm and is injected into the erbium-doped fiber (EDF) 204 through the wavelength division multiplexer 205. In the erbium-doped fiber 204, the erbium ions in the erbium fiber are absorbed.
  • EDF erbium-doped fiber
  • the energy of the pump light is pumped to a higher energy level, followed by spontaneous emission (ASE) to produce a broad spectrum of light signals; the broad spectrum light signal is filtered by the Fabry-Perot etalon filter 203 and is The mirror 202 is reflected back into the erbium doped fiber 204 and is amplified again therein; the amplified multi-wavelength optical signal can be filtered by the wavelength division multiplexer 205 and the gain flattening filter 206, and then passed through the isolator 207. And is finally output.
  • ASE spontaneous emission
  • FIG. 7B shows the connection between the optical elements of the reflective multi-wavelength light source device 200 according to an embodiment of the present invention.
  • 208, 209, 210, 211, 212, and 213 are optical elements, respectively.
  • the fiber fusion splice point will not be described here.
  • the embodiment of the present invention only uses the cascaded multi-wavelength light source device 100 and the reflective multi-wavelength.
  • the light source device 200 is described as an example.
  • the multi-wavelength light source device 10 according to the embodiment of the present invention may have other structures, and the embodiment of the present invention is not limited thereto.
  • the multi-wavelength light source device of the embodiment of the present invention can selectively output an optical signal having a desired wavelength through an optical filter, and re-amplify the optical signal by injecting the optical signal into the erbium-doped fiber, so that the spectral energy of the output light is concentrated. And the power of the output light can be increased.
  • the multi-wavelength light source device of the embodiment of the invention has the characteristics of polarization insensitivity, simple structure and low cost.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or may be a device, or a device. Form, pick up. ⁇ .
  • the components displayed by the unit may or may not be physical, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware.

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Abstract

一种多波长光源装置（10），该多波长光源装置（10）包括：泵浦光源（11），用于提供泵浦光；掺铒光纤（12），用于吸收该泵浦光的能量而发射宽谱激光；光学滤波器（13），用于对该宽谱激光进行滤波，并输出该光学滤波器（13）的自由光谱范围内的多波长光信号；其中，该多波长光信号入射到该掺铒光纤（12），该掺铒光纤（12）还用于对该入射的该多波长光信号再次放大后输出。该多波长光源装置能够选择输出光的波长，并且输出光的光谱能量集中，功率大；并且，该多波长光源装置偏振不敏感，结构简单和成本低。

Description

多波长光源装置 本申请要求于 2012 年 12 月 28 日提交中国专利局、 申请号为 201210587190.2, 发明名称为 "多波长光源装置" 的中国专利申请优先权， 其 全部内容通过引用结合在本申请中。
技术领域
本发明涉及光通信领域， 尤其涉及光通信领域中的一种多波长光源装置。 背景技术
在波分复用 （Wavelength-Division Multiplexing, 简称为 "WDM" )无源光 网络（Passive Optical Network, 简称为 "PON" )、 密集波分复用系统（ Density Wavelength-Division Multiplexing , 简称为 "DWDM" )以及一些无源光器件的 测试领域， 需要用到多波长光源装置， 该多波长光源装置能够同时发射多个波 长。
目前， 多波长光源装置主要通过超辐射激光器 /发光二极管 （ Super Luminescent Diode/Super-Luminescent Light Emitting Diode , 简 称 为 " SLD/SLED" )、 掺铒光纤自发辐射光源 （Erbium Doped Fiber Amplified Spontaneous Emission, 简称为 "EDF-ASE" )或分布式反馈激光器（ Distributed Feedback Laser , 简称为 "DFB " ) 阵列来实现。
具体而言， SLD/SLED能够发射符合一定波长范围要求的宽谱光信号， 但 SLD/SLED 作为携带调制数据的信号光源， 存在单位波长内光功率较小的缺 陷， 并且发射的宽谱光信号还具有一定的偏振态， 对后续的使用带来不便。 掺 铒光纤自发辐射光源（ EDF-ASE )基于掺铒光纤的自发辐射光源， 使用掺铒光 纤放大器 （ Erbium Doped Fiber Amplifier, 简称为 "EDFA" )来发射宽谱光信 号， 并可以通过不同的铒纤选择以及泵浦来实现 C波段以及 L波段的自发辐 射。 虽然 EDF-ASE光源的发光功率较 SLD有较大的提升， 但由于 EDF-ASE 发射的光信号的光谱宽度较宽，并且其中有用的波长成分又只占到全部光谱的 一小部分， 导致单位有用光功率较小， 不方便使用。
DFB阵列釆用多个 DFB激光器构成激光器阵列 ,来提供所需的多个波长， 每个单波的单色性好， 功率大。 但该 DFB阵列需要复杂的波长温度控制， 对 准耦合困难， 成本较高， 并且 DFB阵列同样存在偏振态的问题。
因此， 需要一种光谱能量集中且结构简单的多波长光源装置。
发明内容
本发明提供了一种多波长光源装置，该多波长光源装置的光谱能量集中且 结构简单。
第一方面， 本发明实施例提供了一种多波长光源装置， 该多波长光源装置 包括： 泵浦光源， 用于提供泵浦光； 掺铒光纤， 用于吸收该泵浦光的能量而发 射宽谱激光； 光学滤波器， 用于对该宽谱激光进行滤波， 并输出该光学滤波器 的自由光谱范围内的多波长光信号；其中，该多波长光信号入射到该掺铒光纤， 该掺铒光纤还用于对该入射的该多波长光信号再次放大后输出。
在第一方面的第一种可能的实现方式中， 该多波长光源装置还包括： 增益 平坦滤波器， 用于将该光学滤波器输出的多波长光信号进行滤波， 并将滤波后 的多波长光信号输出到该掺铒光纤进行再次放大。
在第一方面的第二种可能的实现方式中， 该多波长光源装置还包括： 增益 平坦滤波器， 用于将经过该掺铒光纤再次放大后输出的多波长光信号进行滤 波。
结合第一方面或第一方面的第一种或第二中可能的实现方式，在第一方面 的第三种可能的实现方式中， 该掺铒光纤包括第一掺铒光纤和第二掺铒光纤， 其中， 该第一掺饵光纤设置在该泵浦光源和该光学滤波器之间， 用于生成该宽 谱激光；该第二掺饵光纤用于对该光学滤波器输出的多波长光信号进行再次放 大后输出。
结合第一方面的第三种可能的实现方式，在第一方面的第四种可能的实现 方式中， 该多波长光源装置还包括： 光分路器， 用于将该泵浦光源发射的泵浦 光分为两部分， 第一部分泵浦光入射到该第一掺饵光纤， 第二部分泵浦光入射 到该第二掺何光纤； 第一波分复用器， 用于将该第二部分泵浦光和该光学滤波 器输出的多波长光信号进行合路， 并入射到该第二掺饵光纤。
结合第一方面的第四种可能的实现方式，在第一方面的第五种可能的实现 方式中， 该多波长光源装置还包括： 第一光隔离器， 设置在该光学滤波器和该 第一波分复用器之间； 第二光隔离器，设置在该第二掺饵光纤和该多波长光源 装置的输出端之间。
结合第一方面或第一方面的第一种或第二种可能的实现方式，在第一方面 的第六种可能的实现方式中，该多波长光源装置还包括第二波分复用器和反射 器， 其中， 该泵浦光源发射的泵浦光经过该第二波分复用器后入射到该掺饵光 纤， 该光学滤波器输出的多波长光信号经该反射器反射回该光掺饵光纤， 并经 过该掺铒光纤再次放大后通过该第二波分复用器输出。
结合第一方面的第六种可能的实现方式，在第一方面的第七种可能的实现 方式中， 该多波长光源装置还包括： 第三光隔离器， 设置在该第二波分复用器 和该多波长光源装置的输出端之间。
结合第一方面或第一方面的第一种至第七种可能的实现方式中的任意一 种实现方式，在第一方面的第八种可能的实现方式中， 该泵浦光源为泵浦激光 器， 该泵浦激光器提供中心波长为 980纳米的泵浦光。
结合第一方面或第一方面的第一种至第七种可能的实现方式中的任意一 种实现方式，在第一方面的第九种可能的实现方式中， 该光学滤波器为法布里 -珀罗滤波器。
结合第一方面或第一方面的第一种至第七种可能的实现方式中的任意一 种实现方式，在第一方面的第十种可能的实现方式中， 该多波长光信号具有的 波长在 1528纳米至 1565纳米的范围内，或在 1565纳米至 1625纳米的范围内。
基于上述技术方案， 本发明实施例的多波长光源装置，通过光学滤波器能 够选择输出具有所需要波长的光信号，并且通过将该光信号入射到掺铒光纤中 进行再次放大，使得输出光的光谱能量集中，并能够增大输出光的功率； 另夕卜， 本发明实施例的多波长光源装置还具有偏振不敏感、 结构简单和成本低的特 点。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对本发明实施例中所 需要使用的附图作简单地介绍， 显而易见地， 下面所描述的附图仅仅是本发明 的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1是根据本发明实施例的多波长光源装置的示意性框图。
图 2是根据本发明实施例的多波长光源装置的另一示意性框图。
图 3是根据本发明实施例的多波长光源装置的再一示意性框图。
图 4是根据本发明实施例的级联型多波长光源装置的示意性框图。
图 5A和 5B是根据本发明实施例的级联型多波长光源装置的另一示意性 框图。
图 6是根据本发明实施例的反射型多波长光源装置的示意性框图。
图 7A和 7B是根据本发明实施例的反射型多波长光源装置的另一示意性 框图。
具体实施方式
下面将结合本发明实施例中的附图 ,对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例是本发明的一部分实施例， 而不是全 部实施例。基于本发明中的实施例， 本领域普通技术人员在没有做出创造性劳 动的前提下所获得的所有其他实施例， 都应属于本发明保护的范围。
应理解， 本发明实施例的技术方案可以应用于各种通信系统， 例如： 固定 接入网 （Fixed Access ) , 核心网 （ Core Network ) , 数据通信网 ( Data Communication )、 传送网 ( Transport Network )或无线接入网 ( Radio Access ) 等各种通信系统中， 尤其是固定接入网中的波分复用无源光网络 ( Wavelength-Division Multiplexing - Passive Optical Network , 简称为 "WDM-PON" )、 传送网中的密集波分复用系统（ Density Wavelength-Division Multiplexing, 简称为 "DWDM" )、 光传送网 （ OpticalTransport Network, 简称 为 'ΌΤΝ" )或无线接入中的（ Radio Access )无线云接入网络（ Cloud Radio Access Network, 简称为 "C-RAN" )等。
应理解， 本发明实施例仅以光通信应用场景为例进行说明，但本发明实施 例并不限于此，根据本发明实施例的多波长光源装置还可以应用于需要多波长 光源装置的其它应用场景。
图 1示出了根据本发明实施例的多波长光源装置 10的示意性框图。 如图 1所示， 该多波长光源装置 10包括： 泵浦光源 11、 掺铒光纤 12和光学滤波器 13 , 其中， 该泵浦光源 11用于提供泵浦光； 该掺铒光纤 12用于吸收该泵浦光 的能量而发射宽谱激光； 该光学滤波器 13用于对该宽谱激光进行滤波， 并输 出该光学滤波器 13的自由光谱范围内的多波长光信号； 其中， 该多波长光信 号入射到该掺铒光纤 12, 该掺铒光纤 12还用于对该入射的该多波长光信号再 次放大后输出。
具体而言， 泵浦光源 11输出的泵浦光入射到掺铒光纤 12, 该掺铒光纤 12 内的铒离子吸收了泵浦光的能量后，被抽运到更高能级而发生自发辐射，产生 宽谱激光， 该宽谱激光入射到光学滤波器 13 , 并经过该光学滤波器 13滤波后 输出具有所需要波长的多波长光信号， 该多波长光信号最后经过掺铒光纤 12 再次放大后输出。
因此， 本发明实施例的多波长光源装置，通过光学滤波器能够选择输出具 有所需要波长的光信号， 并且通过将该光信号入射到掺铒光纤中进行再次放 大， 使得输出光的光谱能量集中， 并能够增大输出光的功率； 另外， 本发明实 施例的多波长光源装置还具有偏振不敏感、 结构简单和成本低的特点。
在本发明实施例中， 通过控制掺铒光纤 12中的铒离子的掺杂浓度， 可以 产生包括所需要波长的宽谱激光， 例如， 该掺铒光纤 12吸收泵浦光的能量后， 可以产生覆盖 C波段或 L波段的宽谱激光， 以便能够用于通信领域。 例如， 对于普通的 C波段用的掺铒光纤， 铒离子的浓度可以设置为 400ppm (百万分 比浓度）至 600ppm; 而对于 L波段用的掺铒光纤， 铒离子的浓度可以设置为 lOOOppm以上。
应理解， 在本发明实施例中， C 波段或 L 波段符合国际电信联盟 ( International Telecommunication Union, 简称为 "ITU" ) 的电信标准化组织 ( ITU-T ) 定义的相关标准。 具体而言， C 波段可以指代波长在 1528nm 至 1565nm范围内的光信号； L波段可以指代波长在 1565nm至 1625nm范围内的 光信号。
在本发明实施例中， 可选地， 该泵浦光源 11为泵浦激光器， 该泵浦激光 器提供中心波长为 980纳米的泵浦光。 即该泵浦光源 11输出的泵浦光的波长 或中心波 为 980纳 浦激光器也 980nm泵浦激光器。 应理解，
Figure imgf000005_0001
于 。 '、 '、 ' 在本发明实施例中， 可选地， 该光学滤波器 13 为法布里 -珀罗滤波器 ( Fabry-Perot etalon Filter )。该法布里 -珀罗滤波器也可以称之为法布里-珀罗标 准具滤波器， 或称为 FP滤波器。 为了使得根据本发明实施例的多波长光源装 置能够应用于光通信领域， 该光学滤波器 13 的自由光谱范围 （Free Spectral Range, 简称为 "FSR" )可以设计成符合 ITU-T定义的波长点， 当然也可以设 计成符合其它所需要的波长。
在本发明实施例中，可选地，光学滤波器 13的自由光语范围 FSR为 50GHz 或 100GHz。 应理解， 在本发明实施例中， 通过选择法布里-珀罗滤波器的 FP 谐振腔的折射率以及该 FP谐振腔的长度， 就可以设计所需的频率间隔 FSR。
具体而言， 例如， 如果该 FP谐振腔为空气介质， 即该 FP谐振腔的折射 率为 1 , 那么： 如果要设计一个频率间隔为 50GHz的 FP滤波器， 可以将该 FP 谐振腔的长度设计为 2.99792458mm; 如果要设计一个频率间隔为 100GHz的 FP滤波器， 可以将该 FP谐振腔的长度设计为 1.49896229mm。
应理解， 根据应用需要， 光学滤波器可以具有其它的自由光谱范围， 并且 也可以釆用除 FP滤波器之外的其它能够选择输出特定频率间隔或 FSR内的光 信号的滤波器， 本发明实施例并不限于此。
在本发明实施例中， 可选地， 该多波长光信号具有的波长在 1528纳米至 1565纳米的范围内， 或在 1565纳米至 1625纳米的范围内。 即在本发明实施 例中， 可以通过选择掺铒光纤中铒离子的掺杂浓度， 并确定光学滤波器的自由 光谱范围， 可以使得多波长光源装置输出的光信号的波长主要在 1528纳米至 1565纳米的范围内， 或在 1565纳米至 1625纳米的范围内。
在本发明实施例中， 可选地， 如图 2所示， 该多波长光源装置 10还包括： 增益平坦滤波器 14, 用于将该光学滤波器 13输出的多波长光信号进行滤 波， 并将滤波后的多波长光信号输出到该掺铒光纤 12进行再次放大。
具体而言， 如图 2所示，增益平坦滤波器 14可以设置在掺铒光纤 12和多 波长光源装置 10的输出端之间，经过该掺铒光纤 12再次放大后输出的多波长 光信号由增益平坦滤波器 14再次滤波后输出，以均衡多波长光源装置 10输出 的各个波长之间的功率， 使得多波长光源装置 10输出光的光谱能量更均匀更 集中。
在本发明实施例中， 可选地， 如图 3所示， 该多波长光源装置 10还包括： 增益平坦滤波器 14, 用于将经过该掺铒光纤 12再次放大后输出的多波长 光信号进行滤波。
具体而言， 如图 3 所示， 增益平坦滤波器 14可以设置在光学滤波器 13 和掺铒光纤 12之间， 用于将该光学滤波器 13输出的多波长光信号进行滤波， 并将经过光学滤波器 13滤波后的多波长光信号输出到该掺铒光纤 12进行再次 放大， 以均衡多波长光源装置 10输出的各个波长之间的功率， 使得多波长光 源装置 10输出光的光谱能量更均勾更集中。 应理解， 在本发明实施例中， 增益平坦滤波器 14既可以用于将该光学滤 波器 13输出的多波长光信号进行滤波， 并将滤波后的多波长光信号输出到该 掺铒光纤 12进行再次放大，也可以用于将经过该掺铒光纤 12再次放大后输出 的多波长光信号进行滤波。
应理解， 在本发明实施例中， 根据多波长光源装置的具体结构设计， 也可 以将增益平坦滤波器设置在其它位置， 以均衡各个波长之间的功率， 本发明实 施例并不限于此。
因此， 本发明实施例的多波长光源装置，通过光学滤波器能够选择输出具 有所需要波长的光信号， 并且通过将该光信号入射到掺铒光纤中进行再次放 大， 使得输出光的光谱能量集中且均匀， 并能够增大输出光的功率； 另外， 本 发明实施例的多波长光源装置还具有偏振不敏感、 结构简单和成本低的特点。
在本发明实施例中， 可以釆用级联型结构或反射型结构， 将光学滤波器输 出的多波长光信号入射到掺铒光纤， 进行再次放大后输出。 下面将结合图 4 至图 7B, 分别对根据本发明实施例的级联型多波长光源装置和反射型多波长 光源装置进行详细描述。
图 4示出了根据本发明实施例的级联型多波长光源装置的示意性框图。如 图 4所示， 在本发明实施例中， 可选地， 该掺铒光纤 12包括第一掺铒光纤 15 和第二掺铒光纤 16, 其中， 该第一掺饵光纤 15设置在该泵浦光源 11和该光 学滤波器 13之间， 用于生成该宽谱激光； 该第二掺饵光纤 16用于对该光学滤 波器 13输出的多波长光信号进行再次放大后输出。
应理解， 在本发明实施例中， "第一" 和 "第二" 仅仅是为了指代不同的 器件， 而不应对器件的数量或功能等进行任何限定， 例如， 第一掺铒光纤或第 二掺铒光纤都可以包括一个或多个掺铒光纤。
即在本发明实施例中，通过至少两个掺铒光纤可以实现多波长光信号的再 次放大， 以集中光谱能量并增加输出功率。
在本发明实施例中， 可选地， 该多波长光源装置 10还包括：
光分路器， 用于将该泵浦光源发射的泵浦光分为两部分， 第一部分泵浦光 入射到该第一掺何光纤， 第二部分泵浦光入射到该第二掺何光纤；
第一波分复用器，用于将该第二部分泵浦光和该光学滤波器输出的多波长 光信号进行合路， 并入射到该第二掺饵光纤。
例如， 如图 5A所示， 多波长光源装置 100包括： 泵浦激光器 101、 光分 路器 102、 掺铒光纤 103 (即第一掺铒光纤 )、 FP滤波器 104、 增益平坦滤波器 105、波分复用器 107 (即第一波分复用器）和掺铒光纤 108 (即第二掺铒光纤）。
其中， 泵浦激光器 101可以发出 980nm左右的泵浦光， 该泵浦光的功率 可以在 150mW至 500mW之间，该泵浦光经过光分路器 102可以分成两部分， 这两部分泵浦光可以分别注入到掺铒光纤 （EDF ) 103和 108中。 例如， 该光 分路器 102的工作波长范围为 960nm至 990nm, 并且分光比例如为 50%。 在 掺铒光纤 103中， 铒纤内的铒离子吸收了泵浦光的能量后被抽运到更高能级， 继而发生自发辐射 （ASE ) 产生宽谱激光， 该宽谱激光可以包括 C 波段 ( 1528nm~1565nm )或 L波段 ( 1565nm~1625nm ) 范围内的光信号， 以便能 用于通信领域。
该宽谱激光可以通过法布里 -珀罗标准具滤波器 104进行滤波，该 FP滤波 器 104例如具有 50GHz或 100GHz的 FSR,其工作波长范围例如为 1520nm至 1630nm。经过 FP滤波器 104输出的多波长光信号以及经过光分路器 102分成 的一部分泵浦光， 可以通过波分复用器 107 进行合路， 并入射到该掺饵光纤 108进行再次放大， 从而能够提升输出光的功率并将能量集中到有用波段。
可选地， 经过 FP滤波器 104滤出的多波长光信号可以先通过增益平坦滤 波器（ Gain Flatness Filter, 简称为 "GFF" ) 105进行再次滤波， 以便实现各个 波长之间的功率均衡，并且经过增益平坦滤波器 105滤波后的多波长光信号以 及经过光分路器 102分成的一部分泵浦光，可以通过波分复用器 107进行合路， 并入射到该掺饵光纤 108进行再次放大，从而能够提升输出光的功率并将能量 集中到有用波段。
在本发明实施例中， 可选地， 该多波长光源装置 10还包括：
第一光隔离器， 设置在该光学滤波器和该第一波分复用器之间；
第二光隔离器， 设置在该第二掺饵光纤和该多波长光源装置的输出端之 间。
例如，如图 5A所示， 多波长光源装置 100还可以包括： 光隔离器 106 (即 第一光隔离器）和光隔离器 109 (即第二光隔离器）， 光隔离器 106和 109用 于对光路中的光信号进行隔离，防止光信号反射。应理解，在本发明实施例中， 还可以设置多个光隔离器， 以防止光路中的光信号反射， 本发明实施例并不限 于此。
图 5B示出了根据本发明实施例的级联型多波长光源装置 100的各光学元 件之间的连接。 如图 5B所示， 110至 118示出了各光学元件之间的光纤熔接 点， 具体而言， 110为泵浦激光器 101和光分路器 102之间的光纤熔接点； 111 为光分路器 102和掺铒光纤 103之间的光纤熔接点； 112为掺铒光纤 103与 FP 滤波器 104之间的光纤熔接点； 113为 FP滤波器与增益平坦滤波器 105之间 的光纤熔接点； 114为增益平坦滤波器 105与光隔离器 106之间的光纤熔接点； 115为光隔离器 106与波分复用器 107之间的光纤熔接点； 116为光分路器 102 和波分复用器 107之间的光纤熔接点； 117为波分复用器 107和掺铒光纤 108 之间的光纤熔接点； 118为掺铒光纤 108和光隔离器 109之间的光纤熔接点。
应理解， 图 5B所示的各元件之间的连接仅仅为了示例说明， 各元件之间 还可以在其它位置具有光纤熔接点， 或具有其它的光纤熔接点和结构， 本发明 实施例并不限于此。
因此， 本发明实施例的多波长光源装置，通过光学滤波器能够选择输出具 有所需要波长的光信号， 并且通过将该光信号入射到掺铒光纤中进行再次放 大， 使得输出光的光谱能量集中， 并能够增大输出光的功率； 另外， 本发明实 施例的多波长光源装置还具有偏振不敏感、 结构简单和成本低的特点。
上文中结合图 4至图 5B, 对根据本发明实施例的级联型多波长光源装置 进行了详细描述， 下面将结合图 6至图 7B, 对根据本发明实施例的反射型多 波长光源装置进行描述。
如图 6所示， 根据本发明实施例的反射型多波长光源装置 10还包括第二 波分复用器 17和反射器 18 , 其中， 该泵浦光源 11发射的泵浦光经过该第二 波分复用器 17后入射到该掺饵光纤 12 , 该光学滤波器 13输出的多波长光信 号经该反射器 18反射回该光掺饵光纤 12, 并经过该掺铒光纤 12再次放大后 通过该第二波分复用器 17输出。
具体而言， 该反射器 18例如为反射镜， 或其它具有反射特性的器件， 该 反射器 18的工作波长例如在 1500nm至 1700nm的范围内， 该反射器 18的反 射率例如为 100%。
可选地， 在本发明实施例中， 该多波长光源装置 10还包括： 第三光隔离 器，设置在该第二波分复用器和该多波长光源装置的输出端之间， 以对光路中 的光信号进行隔离， 防止光信号的反射。
应理解， 该第一光隔离器、 第二光隔离器或第三光隔离器可以包括一个或 多个光隔离器； 还应理解，根据本发明实施例的多波长光源装置的其它元器件 之间还可以具有光隔离器， 本发明实施例并不限于此。
例如， 如图 7A所示， 多波长光源装置 200包括： 泵浦激光器 201、 反射 镜 202、 FP滤波器 203、 掺铒光纤 204、 波分复用器 205、 增益平坦滤波器 206 和光隔离器 207。
其中， 泵浦激光器 201可以发出 980nm左右的泵浦光功率， 并经过波分 复用器 205后注入掺铒光纤 ( EDF ) 204中； 在掺铒光纤 204中， 铒纤内的铒 离子吸收了泵浦光的能量后被抽运到更高能级， 继而发生自发辐射（ASE )产 生宽谱的光信号； 该宽谱光信号通过法布里 -珀罗标准具滤波器 203进行滤波 后， 被反射镜 202反射回到掺铒光纤 204中， 并在其中被再次放大； 经过放大 后的多波长光信号可以通过波分复用器 205以及增益平坦滤波器 206进行滤波 后， 再经过隔离器 207而被最终输出。
图 7B示出了根据本发明实施例的反射型多波长光源装置 200的各光学元 件之间的连接， 如图 7B所示， 208、 209、 210、 211、 212和 213分别为各光 学元件之间的光纤熔接点， 为了简洁， 在此不再赘述。
应理解，根据本发明实施例的反射型多波长光源装置 200中的部分器件的 上述和其它操作和 /或功能，与根据本发明实施例的级联型多波长光源装置 100 中的相应器件相同或相似， 为了简洁， 在此不再赘述。
还应理解，本发明实施例仅以级联型多波长光源装置 100和反射型多波长 光源装置 200为例进行说明， 根据本发明实施例的多波长光源装置 10还可以 具有其它结构， 本发明实施例并不限于此。
因此， 本发明实施例的多波长光源装置，通过光学滤波器能够选择输出具 有所需要波长的光信号， 并且通过将该光信号入射到掺铒光纤中进行再次放 大， 使得输出光的光谱能量集中， 并能够增大输出光的功率； 另外， 本发明实 施例的多波长光源装置还具有偏振不敏感、 结构简单和成本低的特点。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示 例的单元及算法步骤， 能够以电子硬件、 计算机软件或者二者的结合来实现， 为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地 描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决 于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用 来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范 围。
所属领域的技术人员可以清楚地了解到， 为了描述的方便和简洁， 上述描 述的系统、装置和单元的具体工作过程， 可以参考前述方法实施例中的对应过 程， 在此不再赘述。
在本申请所提供的几个实施例中， 应该理解到， 所揭露的系统、 装置和方 法， 可以通过其它的方式实现。 例如， 以上所描述的装置实施例仅仅是示意性 的， 例如， 所述单元的划分， 仅仅为一种逻辑功能划分， 实际实现时可以有另 外的划分方式， 例如多个单元或组件可以结合或者可以集成到另一个系统， 或 一些特征可以忽略， 或不执行。 另夕卜， 所显示或讨论的相互之间的耦合或直接 耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或通信连接，也 可以是 ^的,、 机 ^的或 ^它的形式，接。 ^ 。 、 、 、 - 单元显示的部件可以是或者也可以不是物理 ^元， 即可以位于一个地方， 或者 也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部 单元来实现本发明实施例方案的目的。
另外， 在本发明各个实施例中的各功能单元可以集成在一个处理单元中， 也可以是各个单元单独物理存在，也可以是两个或两个以上单元集成在一个单 元中。 上述集成的单元既可以釆用硬件的形式实现。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于 此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易想到 各种等效的修改或替换， 这些修改或替换都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围应以权利要求的保护范围为准。

Claims

权 利 要 求
1、 一种多波长光源装置， 其特征在于， 包括：
泵浦光源， 用于提供泵浦光；
掺铒光纤， 用于吸收所述泵浦光的能量而发射宽谱激光；
光学滤波器， 用于对所述宽谱激光进行滤波， 并输出所述光学滤波器的自 由光谱范围内的多波长光信号；
其中， 所述多波长光信号入射到所述掺铒光纤， 所述掺铒光纤还用于对所 述入射的所述多波长光信号再次放大后输出。
2、 根据权利要求 1所述的多波长光源装置， 其特征在于， 所述多波长光 源装置还包括：
增益平坦滤波器， 用于将所述光学滤波器输出的多波长光信号进行滤波， 并将滤波后的多波长光信号输出到所述掺铒光纤进行再次放大。
3、 根据权利要求 1所述的多波长光源装置， 其特征在于， 所述多波长光 源装置还包括：
增益平坦滤波器，用于将经过所述掺铒光纤再次放大后输出的多波长光信 号进行滤波。
4、 根据权利要求 1至 3中任一项所述的多波长光源装置， 其特征在于， 所述掺铒光纤包括第一掺铒光纤和第二掺铒光纤， 其中， 所述第一掺饵光纤设 置在所述泵浦光源和所述光学滤波器之间， 用于生成所述宽谱激光； 所述第二 掺饵光纤用于对所述光学滤波器输出的多波长光信号进行再次放大后输出。
5、 根据权利要求 4所述的多波长光源装置， 其特征在于， 所述多波长光 源装置还包括：
光分路器， 用于将所述泵浦光源发射的泵浦光分为两部分， 第一部分泵浦 光入射到所述第一掺饵光纤， 第二部分泵浦光入射到所述第二掺饵光纤； 第一波分复用器，用于将所述第二部分泵浦光和所述光学滤波器输出的多 波长光信号进行合路， 并入射到所述第二掺饵光纤。
6、 根据权利要求 5所述的多波长光源装置， 其特征在于， 所述多波长光 源装置还包括：
第一光隔离器， 设置在所述光学滤波器和所述第一波分复用器之间； 第二光隔离器，设置在所述第二掺何光纤和所述多波长光源装置的输出端 之间。
7、 根据权利要求 1至 3中任一项所述的多波长光源装置， 其特征在于， 所述多波长光源装置还包括第二波分复用器和反射器， 其中， 所述泵浦光源发 射的泵浦光经过所述第二波分复用器后入射到所述掺饵光纤，所述光学滤波器 输出的多波长光信号经所述反射器反射回所述光掺饵光纤，并经过所述掺铒光 纤再次放大后通过所述第二波分复用器输出。
8、 根据权利要求 7所述的多波长光源装置， 其特征在于， 所述多波长光 源装置还包括：
第三光隔离器，设置在所述第二波分复用器和所述多波长光源装置的输出 端之间。
9、 根据权利要求 1至 8中任一项所述的多波长光源装置， 其特征在于， 所述泵浦光源为泵浦激光器，所述泵浦激光器提供中心波长为 980纳米的泵浦 光。
10、 根据权利要求 1至 8中任一项所述的多波长光源装置， 其特征在于， 所述光学滤波器为法布里-珀罗滤波器。
11、 根据权利要求 1至 8中任一项所述的多波长光源装置， 其特征在于， 所述多波长光信号具有的波长在 1528纳米至 1565纳米的范围内， 或在 1565 纳米至 1625纳米的范围内。
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