WO2002047217A1 - Source lumineuse et dispositif à multiplexage en longueurs d'ondes - Google Patents

Source lumineuse et dispositif à multiplexage en longueurs d'ondes Download PDF

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Publication number
WO2002047217A1
WO2002047217A1 PCT/JP2001/010716 JP0110716W WO0247217A1 WO 2002047217 A1 WO2002047217 A1 WO 2002047217A1 JP 0110716 W JP0110716 W JP 0110716W WO 0247217 A1 WO0247217 A1 WO 0247217A1
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Prior art keywords
optical
wavelength
light source
wavelengths
optical fiber
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PCT/JP2001/010716
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English (en)
Japanese (ja)
Inventor
Takeshi Ota
Original Assignee
Photonixnet Kabushiki Kaisha
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Priority to JP2002548828A priority Critical patent/JPWO2002047217A1/ja
Priority to AU2002221079A priority patent/AU2002221079A1/en
Publication of WO2002047217A1 publication Critical patent/WO2002047217A1/fr

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Classifications

    • 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
    • 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
    • H01S3/06791—Fibre ring lasers
    • 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
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/08086—Multiple-wavelength emission

Definitions

  • the present invention relates to a wavelength division multiplexer (WDM).
  • WDM wavelength division multiplexer
  • the present invention relates to a light source that generates light of a plurality of wavelengths used as a light source of a wavelength multiplexing device.
  • the present invention relates to a low-density wavelength multiplexing device (DWDM).
  • DWDM low-density wavelength multiplexing device
  • the present invention relates to optical fiber communication.
  • MMC multiple grating cavity laser
  • h Mu 1 tip 1 ex Laser Oscillator JP-A-62-229891
  • Multi-wavelength semiconductor light source JP-A-5-198893
  • Wavelength multiplexed laser-one oscillator "
  • a laser 102 and lasers 103-1 to 103-n are arranged on the semiconductor laser array 101.
  • the first end face 104a of the semiconductor laser array 101 is coated with a coating having a reflectance of about several tens percent.
  • the second end face 104b of the semiconductor laser array 101 is provided with an anti-reflection coating, and its reflectance is almost zero percent.
  • the laser 102 and the laser 103-1 or 103-n are coupled via the concave diffraction grating 106 at respective wavelengths.
  • laser 102 and laser 103-1 are coupled at wavelength 1
  • the 102 and the Laser 103 — n are coupled at wavelength; L n. Therefore, the two lasers are combined to form an external resonator type laser resonator, and laser oscillation occurs.
  • a modulation current is applied to the lasers 103_1 to 103_n from a current modulation circuit (not shown), and the laser light is modulated by a signal.
  • the modulated laser beams having wavelengths of 1 to n are collected by the laser 102 and then coupled to the optical fiber 105.
  • the multiple grating cavity laser described above has the function of simultaneously oscillating a large number of wavelengths, the function of individually modulating a large number of oscillated wavelengths, and the coupling of an optical signal consisting of these many wavelengths into a single optical fiber. Function.
  • the laser optical system has the advantage that the line width of the oscillated laser light is narrow due to the long cavity optical system, and high quality laser light can be generated. Disclosure of the invention
  • the multiple grating cavity laser has a long resonant optical system length
  • the upper limit of the modulatable speed is limited by the round-trip time of light in the resonator, and the modulation is at most about 622 Mb ps.
  • a wavelength multiplexed light source includes at least two components: an optical amplifier, a first loop-shaped optical fiber, a first optical power bra, a passive wavelength multiplexer.
  • a second optical power bra comprising at least two second loop optical fibers, branching only one wavelength of laser light out of the laser light oscillated at a plurality of wavelengths from the second optical power bra; It is characterized by outputting to the outside.
  • FIG. 1 is a diagram showing a schematic configuration of a wavelength multiplexed light source according to a first embodiment of the present invention.
  • FIG. 2 is a diagram showing a schematic configuration of a wavelength multiplexing device configured using the wavelength multiplexing light source according to the first embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing a partial reflection element used in the wavelength multiplexed light source i_QJ according to the first embodiment of the present invention and an alternative means thereof.
  • FIG. 4 is a diagram showing a schematic configuration of a wavelength multiplexed light source according to a second embodiment of the present invention.
  • FIG. 5 is a diagram showing a schematic configuration of a wavelength multiplexed light source 30 according to a third embodiment of the present invention.
  • FIG. 6 is a diagram showing a schematic configuration of a wavelength multiplexed light source according to a fourth embodiment of the present invention.
  • FIG. 7 is a diagram showing a schematic configuration of a wavelength multiplexed light source 60 according to a fifth embodiment of the present invention.
  • FIG. 8 is a diagram showing a schematic configuration of a wavelength-division multiplexed light source: L according to a sixth embodiment of the present invention.
  • FIG. 9 is a diagram showing a schematic configuration of a wavelength multiplexed light source A according to a seventh embodiment of the present invention.
  • FIG. 10 is a diagram showing a schematic configuration of a conventionally known multiple grating cavity laser. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 shows the establishment of the wavelength multiplexed light source according to the first embodiment of the present invention.
  • an optical amplifier 1 a looped optical fiber 2, a variable optical attenuator 3, an optical power blur 4, a passive wavelength multiplexer (spectroscope) 5, and an optical power blur 6-1 to 6- n, loop optical fiber 7-1 to 7-n, and automatic power control (APC) 8.
  • the optical amplifier 1 uses an L-band (amplifiable wavelength band: 1535 to 1565 nm) erbium-doped optical fiber amplifier (EDFA).
  • L-band amplifiable wavelength band: 1535 to 1565 nm
  • EDFA erbium-doped optical fiber amplifier
  • Type of fiber optic amplifier or semiconductor laser fiber optic amplifier Or a Raman optical fiber amplifier A normal optical amplifier has an optical isolator inside, and light is amplified only in one direction.
  • a fusion type optical fiber optical plastic was used for the optical power bra 4 or the optical power bras 6-1 to 6_n. This is a waveguide type optical power bra or a free space optical type optical power bra. Is also good.
  • Spectrometer an arrayed waveguide grating (AWG) was used, but other types of passive wavelength multiplexers (AWGs) were used.
  • Spectrometer for example, a free-space optical wavelength multiplexer using a diffraction grating, a free-space optical wavelength multiplexer using a dielectric filter, or an optical waveguide using a diffraction grating or a dielectric filter Type wavelength multiplexer.
  • the wavelength of the laser light oscillated by the passive wavelength multiplexer is determined, so that the passive wavelength multiplexer (spectroscope) 5 is controlled to a predetermined temperature by a temperature control mechanism (not shown). Is controlled. This mechanism can be omitted depending on the accuracy of wavelength multiplexing.
  • Spontaneous emission light with a wide wavelength spectrum emitted from an optical amplifier (EDFA) 1 passes through a loop-shaped optical fiber 2, a variable optical attenuator 3, and a light power bra 4, and a passive wavelength multiplexer (AWG) Reach five.
  • the passive wavelength multiplexer (AWG) 5 splits the spontaneous emission light into discrete wavelengths 1 to n and outputs them to each output terminal.
  • the split light of wavelength ⁇ or ⁇ is transmitted to the passive wavelength multiplexer (AWG) 5 again through the loop optical fiber 7-1 to 7 _ ⁇ and the optical power coupler 6-1 to 6- ⁇ , respectively. And return.
  • the passive wavelength multiplexer (AWG) 5 combines the light of wavelengths 1 to ⁇ into one and sends it to the optical amplifier (EDFA) 1 via the optical power bra 4.
  • ⁇ is amplified by an optical amplifier (EDFA) 1, and then looped optical fiber 2, variable optical attenuator 3, optical power bra 4, passive wavelength multiplexer (AWG) 5, Power Brass 6-1 to 6_n, Looped Optical Fibers 7-1 to 7-n, Passive Wavelength Multiplexer (AWG) 5, Optical Brassier 4, and then sent back to Optical Amplifier (EDFA) 1 .
  • EDFA optical amplifier
  • ATG Passive Wavelength Multiplexer
  • the optical power 4 splits a part of the laser light of Send to Force Control Unit (AP C) 8.
  • An automatic output control device (APC) 8 controls the variable optical attenuator 3 so that the laser light oscillation output becomes constant.
  • the automatic output control device (APC) 8 can be omitted. This is because the optical amplifier has a saturation output characteristic, and the laser output is stabilized at a predetermined output. However, the stability of the laser output is better when the automatic power controller (APC) 8 is used.
  • the optical power plugs 6-1 to 6-n branch off part of the laser light with discrete wavelengths 1 to ⁇ and send them to the output terminals 11-1 to 11- ⁇ , respectively.
  • an arbitrary number of wavelengths of laser light determined by the passive wavelength multiplexer (AWG) 5 for wavelengths within the amplifying wavelength band of the optical amplifier (EDFA) 1 Can be oscillated.
  • FIG. 2 is a diagram showing a configuration of a wavelength multiplexing device using the wavelength multiplexing light source of FIG.
  • Wavelength multiplexed light source ⁇ _0_ output terminal 1 1 1 1 to 1 1 _n The laser light of different wavelengths passes through the transmitting module 14-1 to 14-1 n and the passive wavelength multiplexer (AWG) 15 a Are combined into one optical fiber.
  • the transmission modules 141-1 to 14-n are composed of electric signal units 12-1 to 12-n and optical modulators 13-1 to 13-n.
  • the optical modulators 13-1 to 13 _n modulate the laser light from the wavelength multiplexed light source 10 by the electric signal added from the electric signal units 12-1 to 12-n.
  • the laser light that has passed through the transmission modules 1411 to 1411n is an optical signal modulated at a speed of, for example, 10 Gbp / s (10 gigabits per second).
  • Known light modulators 13-1 to 13-n include lithium-niobate-based electro-optic modulators and semiconductor-based electro-optic absorption modulators (QCS E modulators: Quantum Confined St ark Effect: Quantum)
  • QCS E modulators Quantum Confined St ark Effect: Quantum
  • a confined Stark effect modulator can be used.
  • the optical signals 18a having a plurality of wavelengths multiplexed by the passive wavelength multiplexer (AWG) 15a are guided to the communication optical fiber 17 through the optical circuit 16.
  • Light One terminal of Kyure Izuya 16 is connected to a passive wavelength division multiplexer (AWG) 15b for reception.
  • AMG active wavelength division multiplexer
  • the wavelength multiplexed optical signal 18b received through the communication optical fiber 17 is transmitted only to the passive passive wavelength multiplexer (AWG) 15b by the optical circulator 16. You.
  • the received wavelength-division multiplexed optical signal is separated into respective wavelengths by a passive wavelength multiplexer (AWG) 15b for reception and transmitted to the reception units 19-1 to 19-n .
  • a passive wave for reception, a long multiplexer and a passive wavelength multiplexer for transmission are provided.However, only one wavelength multiplexer is provided, and the optical It is also possible to construct a wavelength multiplexing apparatus so that the transmission optical signal and the reception optical signal are coupled to one optical fiber and then wavelength-multiplexed by this wavelength multiplexer. In this case, it is necessary to provide the number of optical circuits and the number of optical power bras as many as the wavelengths to be used.
  • FIG. 2 shows a wavelength multiplexing device for bidirectional optical transmission
  • the present invention can be applied to unidirectional optical transmission in which a transmitting optical fiber and a receiving optical fiber are provided separately. In this case, there is no need for an optical filter or optical power coupler for coupling the transmission signal and the reception signal.
  • a passive wavelength multiplexer is provided on the transmitting side, but this can be replaced by an optical coupling means having no wavelength selectivity, such as a linear optical power blur.
  • An optical amplifier can be added to the configuration of FIG.
  • a preamplifier is installed between the passive wavelength multiplexer 15b on the receiving side and the optical circuit 16 or between the passive wavelength multiplexer 15a on the transmitting side and the optical circuit 16
  • An amplifier can be installed in the booth.
  • FIG. 3 (a) shows a partial reflection element composed of an optical power bra 6 and a loop optical fiber 7.
  • a partially reflecting element including a lens 46, a half mirror 47, and a lens 48.
  • the optical signal from the optical fiber 45 is converted into substantially parallel light by a lens 46 and guided to an optical fiber 49 via a half mirror 47 and a lens 48. At this time, part of the light incident from the right side of the figure is reflected by the half mirror and sent to the optical fiber 45 side, and the rest is sent to the optical fiber 49 side. Therefore, according to the configuration of FIG. 3 (b), a function substantially equivalent to the configuration of FIG. 3 (a) can be realized.
  • the wavelength multiplexed light source _ _Q_ shown in FIG. 1 has the above-mentioned partial reflection element (optical power bra 6 and loop optical fiber 7 or half mirror 47) near the output terminal, the wavelength Reflection occurs when an optical signal is externally applied to the output terminal of the multiplexed light source.
  • the wavelength multiplexing device shown in FIG. 2 is provided with the optical circuit 16, no optical signal is externally applied to the output terminal of the wavelength multiplexing light source.
  • FIG. 4 shows the configuration of a wavelength multiplexed light source according to a second embodiment of the present invention.
  • the wavelength multiplexed light source ⁇ is an optical amplifier (EDFA) 22, the first passive wavelength multiplexer (AWG) 23, the optical power blur 28-1 to 28- ⁇ , and the second passive wavelength multiplexer (AWG). ) 24, variable optical attenuator 26, optical power bra 25, and automatic power control (APC) 27.
  • EDFA optical amplifier
  • ABG first passive wavelength multiplexer
  • ABG variable optical attenuator
  • APC automatic power control
  • the spontaneous emission light from the optical amplifier (EDFA) 22 is separated by the first passive wavelength multiplexer (AWG) 23 into discrete wavelengths 1 or ⁇ , and the corresponding light After passing through the power brass 28-1 to 28- ⁇ , they are combined again into one optical fiber by the second passive wavelength multiplexer ( ⁇ WG) 24. Then, the light is sent to the optical amplifier (EDFA) 22 again through the variable optical attenuator 26 and the optical power bra 25.
  • the discrete wavelengths 1 to n are amplified by the optical amplifier (EDFA) 22 and return to the optical amplifier (EDFA) 22 again along the same path as described above. That is, a closed loop is formed, and laser oscillation occurs. Laser light oscillated at discrete wavelengths 1 to n is partially branched by the optical power plugs 28-1 to 28_n and guided to the output terminals 21-1 to 21-n. .
  • a part of the collective light of the laser light having discrete wavelengths 1 to n is branched by the optical power bra 25 and sent to the automatic power control device (APC) 27.
  • An automatic output controller (APC) 27 controls the variable optical attenuator 26 so that the laser oscillation has a constant intensity.
  • the wavelength multiplexed light source of the second embodiment has a ring laser structure and does not use a partial reflection element. Therefore, when an optical signal is input from the outside to the output terminals 21_1 to 21-n. However, there is an advantage that reflected light is not returned. On the other hand, it has the disadvantage of using two more expensive passive wavelength multiplexers (AWGs) than the first embodiment.
  • the light incident on the output terminals 21-1 to 21-1n is attenuated by the optical amplifier provided in the optical amplifier (EDFA) 22.
  • the wavelength multiplexed light source of this embodiment can be used in place of the wavelength multiplexed light source 10 of the wavelength multiplexing apparatus shown in FIG.
  • FIG. 5 shows a configuration of the wavelength multiplexed light source A according to the third embodiment of the present invention.
  • the wavelength multiplexed light source 30 is an erbium-doped optical fiber 39, an excitation light source (semiconductor laser) 33, an optical isolator 32, a WDM type optical power plug 40, an optical power bra 41, a loop optical fiber 42, an optical power bra 34, passive wavelength division multiplexer (AWG) 35, optical power bra 36-1 or
  • the excitation light source (semiconductor laser) 33 generates laser light with a wavelength of 980 nm or 1480 nm.
  • the WDM optical power plug 40 is composed of a fusion type optical fiber cover that also has a wavelength multiplexing mechanism.
  • the WDM-type optical power bra 40 couples pump light having a wavelength of 980 nm (or 1480 nm) and C-band signal light (wavelength: 1535 to 1565 nm) into one optical fiber. Or conversely, a wavelength of 980 nm (or 1
  • the erbium-doped optical fiber 39 pumped by the pumping light source 33 has the function of amplifying light, the reflective element consisting of the optical power bra 41 and the loop optical fiber 42, the passive wavelength multiplexer (AWG) 35
  • a closed loop is formed by the optical power bra 36-1 to 36-n and the partially reflecting element group consisting of the loop-shaped optical fibers 37-1 to 37-n, which is determined by the passive wavelength multiplexer (AWG) 35.
  • Laser oscillation occurs at a plurality of discrete wavelengths 1 to n. Then, a part of the laser light of discrete wavelengths 1 to n is output to the output terminal 31-1 or 31- ⁇ via the optical power blur 36-1 to 36-n.
  • a reflecting element such as a reflecting mirror or a fiber Bragg grating filter may be used instead of the reflecting element including the optical power bra 41 and the loop-shaped optical fiber.
  • a part of the laser beam split by the optical power bra 34 is sent to an automatic power controller (APC) 38.
  • An automatic output control device (APC) 38 controls the drive current of the excitation light source 33 so that the laser oscillation output becomes constant.
  • Excitation light from the excitation light source 33 excites the erbium-doped optical fiber 39 by the WDM type optical bra 40, and is reflected by the optical bra 41 and the loop optical fiber 42 to excite the erbium-doped optical fiber 39 again. After that, the light is sent to the excitation light source 33 through the WDM type optical power bra 40. However, the reflected excitation light is absorbed by the optical isolator 32, which prevents the excitation light from returning to the excitation light source 33.
  • the laser oscillation light output control is performed by controlling the drive current of the pump light source 33, so that the variable optical attenuator can be omitted.
  • FIG. 6 shows the configuration of a wavelength multiplexed light source according to a fourth embodiment of the present invention.
  • This wavelength-multiplexed light source ⁇ is composed of a first optical amplifier (EDFA-C) 59a, a second optical amplifier (EDF ⁇ -L) 59b, a first optical power 54a, and a second optical power 54b, Third optical power bra 54c, Variable optical attenuator 53, Passive wavelength multiplexer (spectroscope) 55, Optical power bra 56-1 or 56-n, Loop optical fiber 57-1 to 57 — N, consisting of an automatic power control (APC) 58.
  • This embodiment is a modification of the first embodiment shown in FIG.
  • the main difference is that the first optical amplifier (EDFA-C) 59a and the second optical amplifier (EDFA-L) 59b are provided, the second optical power bra 54b and the third optical power bra 54c. Are arranged in parallel.
  • the first optical amplifier (EDFA-C) 59a has gain in the wavelength band of the C band (1535-1565 nm), and the second optical amplifier (EDFA-L) 59b has the gain in the L band (1565-1 (595 nm).
  • EDFA-C has gain in the wavelength band of the C band (1535-1565 nm)
  • the second optical amplifier (EDFA-L) 59b has the gain in the L band (1565-1 (595 nm).
  • the passive wavelength multiplexer (division device) 55 is different from those of the other embodiments, and is designed to be capable of wavelength multiplexing over this wide wavelength band. .
  • the oscillated laser light of each wavelength is output from output terminals 51-1 to 51-n.
  • FIG. 7 shows a configuration of a wavelength multiplexed light source according to a fifth embodiment of the present invention.
  • the wavelength multiplexing light source is an optical amplifier (ED FA) 62, a passive wavelength multiplexer (AWG) 63, an optical power 68-1-1 to 68_n, a linear optical power 64, a variable optical attenuator 66. , Optical power 65 and automatic power control (APC) 67.
  • the oscillated laser light of each wavelength is output from the output terminals 61-1 to 61-n.
  • This embodiment is a modification of the second embodiment shown in FIG.
  • two passive wavelength multiplexers (AWGs) 23 to 24 are used.
  • a perimeter optical power bra 64 is used instead of the passive wavelength multiplexers (AWG) 24.
  • the passive wavelength multiplexer (AWG) 63 of this embodiment corresponds to the passive wavelength multiplexer (AWG) 23 of the second embodiment.
  • the linear optical power plastic has the advantage of being less expensive than the arrayed waveguide grating (AWG).
  • AWG arrayed waveguide grating
  • FIG. 8 shows the configuration of the wavelength multiplexed light source L according to the sixth embodiment of the present invention.
  • the wavelength multiplexing light source 70 is a semiconductor laser 79, a lens 72, an optical power blur 74, a passive wavelength multiplexer (AWG) 75, an optical power blur 76-1 to 76-n, and no loop optical fiber 77-1. 77-n, consisting of an automatic output controller (APC) 78.
  • APC automatic output controller
  • the first end face 79a of the semiconductor laser has a ⁇ reflectivity (HR) coat, and the second end face 79b has an antireflection (AR) coat.
  • the semiconductor laser 79 cannot oscillate by itself because the second end face 79b has an anti-reflection (AH) coat, but can oscillate by feedback of light from an external optical system. A so-called external resonance optical system is formed.
  • Spontaneous emission light from the semiconductor laser 79 is coupled to the optical fiber 73 by the lens 72.
  • the light coupled to the optical fiber 73 is a part consisting of an optical power 74, a passive wavelength multiplexer (AWG) 75, an optical power 76-1 to 76-n, and a loop optical fiber 77-1 to 77-n.
  • the light After passing through the reflecting element group, the light enters the semiconductor laser 79 again via the passive wavelength multiplexer (AWG) 75, the optical power bra 74, the optical fiber 73, and the lens 72. That is, a closed loop is formed as a whole, and laser oscillation occurs.
  • the laser light of 1 to n which oscillated the laser is partly branched by the optical power plugs 76-1 to 76-n and output from the output terminals 71-1 to 71_n. Further, a part of the laser light is branched by the optical power bra 74 and sent to the automatic output control device (APC) 78.
  • the automatic output control device (APC) 78 controls the drive current of the semiconductor laser 79 so that the laser oscillation output becomes constant.
  • the semiconductor laser 79 has the advantage that the wavelength selection range is wider than that of rare-earth-doped optical fibers such as erbium-doped optical fibers, and that the optical amplifiable wavelength band as an optical amplifier is wider. It is also generally low cost.
  • FIG. 9 shows a configuration of a wavelength multiplexed light source A according to a seventh embodiment of the present invention.
  • the wavelength multiplexed light source 80 is a semiconductor laser 89, a concave diffraction grating 82, and an optical fiber 83-1 to 8 It consists of 3-n, optical power plugs 86-1 to 86-n, and loop optical fiber 87-1 to 87_n. Laser light of each wavelength is output from output terminals 81_1 through 81-n.
  • the first end face 89a of the semiconductor laser has a high reflectivity (HR) coat
  • the second end face 89b has an anti-reflection (AR) coat.
  • the semiconductor laser 89 cannot oscillate by itself because the second end face 89b has an anti-reflection (AR) coat, but it can oscillate by feedback of light from an external optical system. A so-called external resonance optical system is formed.
  • This embodiment is a modification of the sixth embodiment.
  • the present embodiment is characterized in that a spectroscopic optical system including a concave diffraction grating 82 and a free space optical system is used instead of the arrayed waveguide diffraction grating (AWG).
  • AWG arrayed waveguide diffraction grating
  • the spontaneous emission light from the semiconductor laser 89 is coupled by the concave diffraction grating 82 to the optical fibers 83 1 1 to 83-n at specific wavelengths 1 to n, respectively.
  • the light coupled to the optical fiber 83-1 through 83-n passes through the partial reflection element group consisting of the optical power plugs 76-1 through 76-n and the loop optical fiber 77-1 through 77-n.
  • the light enters the semiconductor laser 89 through 83-1 to 83-n and the concave diffraction grating 82. That is, a closed loop is formed as a whole, and laser oscillation occurs.
  • Concave gratings have the advantage of lower cost compared to arrayed waveguide gratings (AWGs).
  • a combination of a transmission diffraction grating and a lens, or a combination of a dielectric film and a lens, or the like can be used as a known spectral optical system.
  • the partial reflection element group consisting of the optical power bras 76_1 to 76-n and the loop-shaped optical fibers 77-1 to 77-1n the partial reflection consisting of the half mirror and the lens shown in Fig. 3 (b) Elements can also be used.
  • a plurality of wavelengths can be simultaneously laser-oscillated, and laser light signals having individual wavelengths can be separated and extracted.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

Selon la présente invention, la limite supérieure d'une vitesse modulable d'un laser à cavité à plusieurs réseaux a été limitée par le temps d'aller-retour de la lumière dans un résonateur en raison de la forme oblongue du système optique de résonance. Le dispositif comporte un amplificateur optique (1), une fibre optique en boucle (2), un coupleur optique (4), un multiplexeur en longueurs d'ondes passif (5), et des fibres optiques en boucle (7-1 à 7-n) ainsi que des fibres optiques (6-1 à 6-n) correspondant aux différentes sorties de ramification du multiplexeur en longueurs d'ondes passif (5) de façon à former des boucles fermées pour les faisceaux laser des différentes longueurs d'ondes. Il en résulte que les faisceaux laser des différentes longueurs d'ondes se prêtent à une extraction à destination de l'extérieur au départ des bornes de sortie (11-1 à 11-n) puis à une modulation par un modulateur optique, ce qui permet la production d'un signal à multiplexage en longueurs d'ondes à grande vitesse de modulation.
PCT/JP2001/010716 2000-12-08 2001-12-07 Source lumineuse et dispositif à multiplexage en longueurs d'ondes WO2002047217A1 (fr)

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JP2002548828A JPWO2002047217A1 (ja) 2000-12-08 2001-12-07 波長多重化光源及び波長多重化装置
AU2002221079A AU2002221079A1 (en) 2000-12-08 2001-12-07 Wavelength multiplexing light source and wavelength multiplexing device

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JP2000-374156 2000-12-08
JP2000374156 2000-12-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102353373A (zh) * 2011-07-12 2012-02-15 浙江大学 基于双路闭环锁定技术的谐振式光学陀螺
WO2020105168A1 (fr) * 2018-11-22 2020-05-28 三菱電機株式会社 Système de communication à multiplexage en longueur d'onde et procédé de réglage de système de communication à multiplexage en longueur d'onde

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JPH05241209A (ja) * 1992-03-02 1993-09-21 Fujitsu Ltd 光増幅器制御システム
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JPWO2020105168A1 (ja) * 2018-11-22 2021-02-15 三菱電機株式会社 波長多重通信システム及び波長多重通信システムの調整方法

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