WO2023157269A1 - Module optique et système de communication optique - Google Patents

Module optique et système de communication optique Download PDF

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Publication number
WO2023157269A1
WO2023157269A1 PCT/JP2022/006816 JP2022006816W WO2023157269A1 WO 2023157269 A1 WO2023157269 A1 WO 2023157269A1 JP 2022006816 W JP2022006816 W JP 2022006816W WO 2023157269 A1 WO2023157269 A1 WO 2023157269A1
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Prior art keywords
wavelength
light
optical
optical module
resonator
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PCT/JP2022/006816
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English (en)
Japanese (ja)
Inventor
純一 鈴木
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三菱電機株式会社
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Priority to JP2023577097A priority Critical patent/JP7438472B2/ja
Priority to PCT/JP2022/006816 priority patent/WO2023157269A1/fr
Publication of WO2023157269A1 publication Critical patent/WO2023157269A1/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
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters

Definitions

  • the present disclosure relates to optical modules and optical communication systems.
  • WDM Wavelength Division Multiplexing
  • signal lights of a plurality of wavelengths arranged at regular intervals are transmitted through one optical fiber.
  • a light source for realizing the WDM system for example, there is a single mode laser.
  • a single-mode laser is a stable laser that emits light of a single wavelength.
  • light of a plurality of wavelengths must be adjusted at equal intervals.
  • a wavelength locker is required.
  • a multi-wavelength laser described in Patent Document 1 is a light source that can realize the WDM method without performing a highly accurate wavelength locker.
  • the multi-wavelength laser described in Patent Document 1 is a laser that oscillates multi-wavelength light simultaneously by providing a special resonator in one gain medium, and does not perform a highly accurate wavelength locker like a single-mode laser. It is possible to output light of a plurality of wavelengths at even wavelength intervals.
  • An object of the present disclosure is to provide an optical module and an optical communication system capable of controlling the output of light for each wavelength without affecting the output of light of multiple wavelengths. do.
  • An optical module includes: a first variable reflectance mirror that reflects input light; a periodic wavelength filter that is connected in series with the first variable reflectance mirror and has a periodic peak wavelength; and a wavelength spectral filter that divides the input light of a plurality of wavelengths by wavelength, a plurality of gain media that are provided for each wavelength and have different wavelength characteristics, and a light of each wavelength that is provided for each wavelength.
  • phase adjustment units for adjusting the phase of the phase, a plurality of second variable reflectance mirrors provided for each wavelength and reflecting light of each wavelength, a first variable reflectance mirror, a periodic wavelength filter, a wavelength spectral filter, Characteristics of a resonator for each wavelength formed between a first variable reflectance mirror and a plurality of second variable reflectance mirrors by a plurality of gain media, a plurality of phase adjusters, and a plurality of second variable reflectance mirrors and a control unit that controls the
  • the first variable reflectance mirror, the periodic wavelength filter, the spectral wavelength filter, the multiple gain media, the multiple phase adjusters, and the multiple second variable reflectance mirrors combine the first variable reflectance mirror and the multiple The characteristics of the resonator formed between the second variable reflectance mirror and the second variable reflectance mirror are controlled for each wavelength.
  • the optical module according to the present disclosure can control the output of light for each wavelength without affecting the output of light of multiple wavelengths.
  • FIG. 1 is a block diagram showing a configuration example of an optical module according to Embodiment 1;
  • FIG. 4 is a block diagram showing a configuration of a modification of the optical module according to Embodiment 1;
  • FIG. FIG. 8 is a block diagram showing a configuration example of an optical module according to Embodiment 2;
  • FIG. 11 is a block diagram showing a configuration example of an optical module according to Embodiment 3;
  • FIG. 11 is a block diagram showing a configuration example of an optical module according to Embodiment 4;
  • FIG. 12 is a block diagram showing a configuration example of a multi-wavelength optical communication system according to Embodiment 5;
  • FIG. 11 is a block diagram showing a configuration example of a multi-wavelength receiver included in a multi-wavelength optical communication system according to Embodiment 5;
  • FIG. 12 is a block diagram showing a configuration of a modification of the multi-wavelength optical communication system according to Embodiment 5;
  • FIG. 12 is a block diagram showing a configuration example of an optical module according to Embodiment 6;
  • FIG. 1 is a block diagram showing a configuration example of an optical module 1 according to Embodiment 1.
  • an optical module 1 is an optical module capable of outputting multi-wavelength signal light at regular intervals, and includes a multi-wavelength light source 2 and a controller 3 .
  • the multi-wavelength light source 2 is a light source that outputs light of wavelengths ⁇ 1 to ⁇ n at regular intervals, and is, for example, a planar waveguide system on a silicon platform.
  • n is a positive natural number.
  • ⁇ i .
  • Light is oscillated at regular intervals.
  • i is a natural number of 1 or more and n or less.
  • the multi-wavelength light source 2 includes a variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n gain media 24-1, 24-2, . 25-1 to 25-n and n variable reflectance mirrors 26-1 to 26-n.
  • Components of the resonator for each wavelength are a variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n gain media 24-1 to 24-n, and n phase adjusters 25-1 to 25.
  • -n and n variable reflectance mirrors 26-1 to 26-n These components form a resonator between the variable reflectance mirror 21 and each of the n variable reflectance mirrors 26-1 to 26-n.
  • the variable reflectance mirror 21 is a first variable reflectance mirror that reflects the input light, and the reflectance is changed by the control unit 3 .
  • the variable reflectance mirror 21 is, for example, a loop mirror.
  • the periodic wavelength filter 22 is a filter having periodic peak wavelengths and is connected in series with the variable reflectance mirror 21 via an optical transmission line. The peak wavelength of the light passed by the periodic wavelength filter 22 is changed by the controller 3 .
  • the periodic wavelength filter 22 is, for example, a ring resonator.
  • the wavelength spectral filter 23 is a filter that divides the input light of n wavelengths into light of each wavelength, and is connected in series with the periodic wavelength filter 22 via an optical transmission line. The spectral operation of the wavelength spectral filter 23 is controlled by the controller 3 .
  • the wavelength spectral filter 23 is, for example, an AWG (Arrayed Waveguide Grating). The period of the peak wavelength of the periodic wavelength filter 22 and the period of the wavelength of the light split by the wavelength spectral filter 23 are set to match each other.
  • the light of each wavelength obtained by dividing the light of n wavelengths by the wavelength spectral filter 23 is transmitted to the optical path system of each wavelength.
  • the optical path system for each wavelength is n optical path systems that are connected in series with the wavelength spectral filter 23, respectively. It is formed by portions 25-1 to 25-n and reflectance variable mirrors 26-1 to 26-n. That is, the i-th optical path system is formed by the gain medium 24-i, the phase adjuster 25-i and the reflectance variable mirror 26-i.
  • the i-th resonator is formed by the variable reflectance mirror 21, the periodic wavelength filter 22, the wavelength spectral filter 23, and the i-th optical path system.
  • the gain media 24-1 to 24-n are gain media having different wavelength characteristics, and each amplify light of n wavelengths with the gain set by the control unit 3.
  • the gain media 24-1 to 24-n are semiconductor amplifiers (SOAs).
  • the phase adjustment units 25-1 to 25-n are components for adjusting the phase of light of each wavelength, and are microheaters, for example.
  • the phase adjusters 25-1 to 25-n adjust the phase of the input light to the phase instructed by the controller 3.
  • the variable reflectance mirrors 26-1 to 26-n are second variable reflectance mirrors that reflect light of each wavelength, and are loop mirrors, for example. The reflectance of each of the reflectance variable mirrors 26-1 to 26-n is changed by the control unit 3.
  • Gain medium 24-1 outputs light of wavelength ⁇ 1
  • gain medium 24-2 outputs light of wavelength ⁇ 2
  • gain medium 24-i outputs light of wavelength ⁇ i
  • gain medium 24- n outputs light of wavelength ⁇ n .
  • the periodic wavelength filter 22 outputs light having the wavelength ⁇ i when the wavelength ⁇ i of the input light has a period corresponding to the peak wavelength.
  • the wavelength spectral filter 23 whose periodic interval of the periodic wavelength filter 22 and the spectral period of the wavelength match, splits the signal light of wavelength ⁇ 1 into the gain medium 24-1, but the signal light of wavelength ⁇ 1 is arranged periodically.
  • the signal light of wavelength ⁇ i is not split into the gain medium 24-1.
  • the wavelength spectral filter 23 splits the light of the wavelength ⁇ i other than the wavelength ⁇ 1 to the gain medium 24-i when the periodic wavelength filter 22 reaches the peak wavelength period of the wavelength ⁇ i .
  • the signal light of wavelength ⁇ 1 separated by the gain medium 24-1 passes through the phase adjuster 25-1, is reflected by the reflectance variable mirror 26-1, and returns to the reflectance variable mirror 21 side again.
  • the signal light of wavelengths ⁇ i other than the wavelength ⁇ 1 which is separated by the gain medium 24-i and periodically arranged, passes through the phase adjustment section 25-i, is reflected by the reflectance variable mirror 26-i, and is reflected again. Return to the variable index mirror 21 side.
  • a resonator for each wavelength is formed between the reflectance variable mirror 21 and the reflectance variable mirrors 26-1 to 26-n.
  • the resonator for each wavelength for example, focusing on a resonator for only one wavelength, the resonator has a configuration of a so-called single-mode laser.
  • the multi-wavelength light source 2 since the multi-wavelength light source 2 has a resonator for each wavelength, mode competition does not occur in the gain media 24-1 to 24-n. Furthermore, by controlling the current injection to the gain medium 24-i by the controller 3, it is possible to adjust the intensity of the signal light output by the multi-wavelength light source 2 for each wavelength.
  • the wavelengths ⁇ i output from the multi-wavelength light source 2 are defined at regular intervals by the periodic wavelength filter 22 . Therefore, by using the optical module 1, a light source that oscillates light of a plurality of wavelengths at regular intervals, which is required for WDM, can be easily realized without using a wavelength locker.
  • the multi-wavelength laser described in Patent Document 1 needs to bundle each wavelength using a wavelength multiplexer. There is no need to separately prepare a wavelength multiplexer.
  • the gain media 24-1 to 24-n are configured with mutually different wavelength characteristics, that is, mutually different gain structures, so that the oscillation efficiency of each wavelength can be improved.
  • the wavelength difference between ⁇ 1 and ⁇ 40 exceeds 30 nm.
  • the gain medium 24-1 has an active layer structure that maximizes the gain at the wavelength ⁇ 1
  • the gain medium 24-40 has an active layer structure that maximizes the gain at the wavelength ⁇ 40 . This allows the optical module 1 to maximize power efficiency at each wavelength.
  • the optical output at which the photoelectric conversion efficiency (hereinafter referred to as power efficiency) is maximized differs for each reflectance of the mirrors that make up the resonator.
  • the controller 3 controls the reflectance of the variable reflectance mirror 21 and the variable reflectance mirrors 26-1 to 26-n according to the optical output required for each wavelength. It is possible to adjust the power efficiency to the maximum. Further, the control unit 3 controls the phase adjustment by the phase adjustment units 25-1 to 25-n, thereby stabilizing the optical output of the multi-wavelength light source 2 and maximizing the power efficiency.
  • FIG. 2 is a block diagram showing a configuration example of an optical module 1A, which is a modified example of the optical module 1.
  • an optical module 1A is an optical module capable of outputting multi-wavelength signal light at regular intervals, and includes a multi-wavelength light source 2A and a controller 3A.
  • the multi-wavelength light source 2A is a light source that outputs light with wavelengths ⁇ 1 to ⁇ n at equal intervals, and is, for example, a planar waveguide system on a silicon platform. , ⁇ i , . . . , ⁇ n lights are oscillated at regular intervals.
  • the multi-wavelength light source 2A includes a variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n gain media 24-1, 24-2, . 25-1 to 25-n and n variable reflectance mirrors 26A-1 to 26A-n.
  • the resonator for each wavelength includes a variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n gain media 24-1 to 24-n, n phase adjusters 25-1 to 25-n and
  • the n variable reflectance mirrors 26A-1 to 26A-n are formed between the variable reflectance mirror 21 and each of the n variable reflectance mirrors 26A-1 to 26A-n.
  • the controller 3A adjusts the reflectance of the variable reflectance mirror 21 and the reflectance of each of the variable reflectance mirrors 26A-1 to 26A-n, thereby adjusting the variable reflectance mirrors 26A-1 to 26A-n.
  • the signal light of wavelength ⁇ i is output from 26A-i
  • the signal light of wavelength ⁇ n is output from reflectance variable mirror 26A-n.
  • the order of arrangement of the gain medium 24-i and the phase adjustment section 25-i may be changed. That is, the gain medium 24-i may be provided between the phase adjuster 25-i and the reflectance variable mirror 26-i or 26A-i. Further, the gain media 24-1 to 24-n may be SOAs with III-V compound semiconductors bonded on Si platforms. Furthermore, the multi-wavelength light source 2 or 2A may be a planar waveguide system made of a glass-based material, or may be a planar waveguide system made of an InP-based material.
  • the optical module 1 includes the variable reflectance mirror 21, the periodic wavelength filter 22 having a periodic peak wavelength, the periodic wavelength filter 22 connected in series with the variable reflectance mirror 21, and the periodic wavelength A wavelength spectral filter 23 connected in series with the filter 22 and separating input signal light of n wavelengths by wavelength, n gain media 24-1 to 24-n, and n phase adjustment units 25-1 to 24-n.
  • variable reflectance mirrors 26-1 to 26-n are arranged by the n phase adjusters 25-1 to 25-n and the n variable reflectance mirrors 26-1 to 26-n. and a controller 3 for controlling the characteristics of the resonator for each wavelength, which is formed between.
  • Reflected by reflectance variable mirror 21, periodic wavelength filter 22, wavelength spectral filter 23, gain media 24-1 to 24-n, phase adjusters 25-1 to 25-n, and reflectance variable mirrors 26-1 to 26-n It controls the characteristics of the resonator for each wavelength formed between the variable index mirror 21 and the variable reflectivity mirrors 26-1 to 26-n.
  • the optical module 1 can control the output of light for each wavelength without affecting the output of light of n wavelengths.
  • FIG. 3 is a block diagram showing a configuration example of the optical module 1B according to the second embodiment.
  • an optical module 1B is an optical module that outputs multi-wavelength signal light at equal intervals, and includes a multi-wavelength light source 2B and a controller 3B.
  • the multi-wavelength light source 2B is a light source that outputs light of wavelengths ⁇ 1 to ⁇ n at regular intervals, and is, for example, a planar waveguide system on a silicon platform.
  • the control unit 3B controls the characteristics of the constituent elements constituting the resonator for each wavelength in the multi-wavelength light source 2B, so that the wavelengths ⁇ 1 , ⁇ 2 , . Light is oscillated at regular intervals.
  • the multi-wavelength light source 2B includes a variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n gain media 24-1, 24-2, . 25-1 to 25-n, n variable reflectance mirrors 26-1 to 26-n, and n modulators 27-1 to 27-n.
  • Components of the resonator for each wavelength are a variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n gain media 24-1 to 24-n, and n phase adjusters 25-1 to 25.
  • -n, n variable reflectance mirrors 26-1 to 26-n and n modulators 27-1 to 27-n These components form a resonator between the variable reflectance mirror 21 and each of the n variable reflectance mirrors 26-1 to 26-n.
  • the variable reflectance mirror 21 is a first variable reflectance mirror that reflects the input light, and the reflectance is changed by the controller 3B.
  • the variable reflectance mirror 21 is, for example, a loop mirror.
  • the periodic wavelength filter 22 is a filter having periodic peak wavelengths and is connected in series with the variable reflectance mirror 21 via an optical transmission line. The peak wavelength of the light passed by the periodic wavelength filter 22 is changed by the controller 3B.
  • the periodic wavelength filter 22 is, for example, a ring resonator.
  • the wavelength spectral filter 23 is a filter that divides the input light of n wavelengths into light of each wavelength, and is connected in series with the periodic wavelength filter 22 via an optical transmission line. The spectral operation of the wavelength spectral filter 23 is controlled by the controller 3B.
  • the wavelength spectral filter 23 is AWG, for example.
  • the period of the peak wavelength of the periodic wavelength filter 22 and the period of the wavelength of the light split by the wavelength spectral filter 23 are set to match each other.
  • the gain media 24-1 to 24-n are gain media having different wavelength characteristics, and amplify light of n wavelengths with gains set by the controller 3B.
  • gain media 24-1 through 24-n are SOAs.
  • the phase adjusters 25-1 to 25-n are components for adjusting the phase of light of each wavelength, and are microheaters, for example.
  • the phase adjusters 25-1 to 25-n adjust the phase of the input light to the phase instructed by the controller 3B.
  • the modulators 27-1 to 27-n are provided for each wavelength and are modulators for modulating the signal light propagating in the resonator, and the modulation of the signal light is controlled by the controller 3B.
  • the optical modulation method is, for example, intensity modulation that modulates the intensity of signal light.
  • Electroabsorption modulators for example, are used for the modulators 27-1 to 27-n.
  • the variable reflectance mirrors 26-1 to 26-n are second variable reflectance mirrors that reflect light of each wavelength, and are loop mirrors, for example. The reflectance of each of the reflectance variable mirrors 26-1 to 26-n is changed by the controller 3B.
  • the wavelength spectral filter 23 whose periodic interval of the periodic wavelength filter 22 and the spectral period of the wavelength match, splits the signal light of wavelength ⁇ 1 into the gain medium 24-1, but the signal light of wavelength ⁇ 1 is arranged periodically.
  • the signal light of wavelength ⁇ i is not split into the gain medium 24-1.
  • the wavelength spectral filter 23 splits the light of the wavelength ⁇ i other than the wavelength ⁇ 1 to the gain medium 24-i when the periodic wavelength filter 22 reaches the peak wavelength period of the wavelength ⁇ i .
  • the signal light of wavelength ⁇ 1 separated by the gain medium 24-1 is input to the modulator 27-1 through the phase adjuster 25-1.
  • signal lights of wavelengths ⁇ i other than the wavelength ⁇ 1 separated by the gain medium 24-i and periodically arranged are input to the modulator 27-i through the phase adjuster 25-i.
  • the modulator 27-1 modulates the signal light of wavelength ⁇ 1 .
  • the signal light of wavelength ⁇ 1 modulated by the modulator 27-1 is reflected by the variable reflectance mirror 26-1 and returns to the variable reflectance mirror 21 side again.
  • the signal light of wavelength ⁇ i modulated by the modulator 27-i passes through the phase adjuster 25-i, is reflected by the variable reflectance mirror 26-i, and returns to the variable reflectance mirror 21 side.
  • a resonator for each wavelength is formed between the reflectance variable mirror 21 and the reflectance variable mirrors 26-1 to 26-n.
  • the resonator for each wavelength for example, focusing on a resonator for only one wavelength, the resonator has a configuration of a so-called single-mode laser.
  • the multi-wavelength light source 2B since the multi-wavelength light source 2B has a resonator for each wavelength, mode competition does not occur in the gain media 24-1 to 24-n. Furthermore, by controlling the current injection to the gain medium 24-i by the controller 3B, it is possible to adjust the intensity of the signal light output by the multi-wavelength light source 2B for each wavelength.
  • the wavelengths ⁇ i output from the multi-wavelength light source 2B are defined at regular intervals by the periodic wavelength filter 22 . Therefore, by using the optical module 1B, a light source that oscillates light of a plurality of wavelengths at regular intervals, which is required by WDM, can be easily realized without using a wavelength locker.
  • the multi-wavelength laser described in Patent Document 1 needs to bundle each wavelength using a wavelength multiplexer. There is no need to separately prepare a wavelength multiplexer.
  • the gain media 24-1 to 24-n are configured with mutually different wavelength characteristics, that is, mutually different gain structures, so that the oscillation efficiency of each wavelength can be improved.
  • the wavelength difference between ⁇ 1 and ⁇ 40 exceeds 30 nm.
  • the gain medium 24-1 has an active layer structure that maximizes the gain at the wavelength ⁇ 1
  • the gain medium 24-40 has an active layer structure that maximizes the gain at the wavelength ⁇ 40 .
  • the optical output with the maximum power efficiency differs for each reflectance of the mirrors that make up the resonator.
  • the controller 3B controls the reflectance of the variable reflectance mirror 21 and the variable reflectance mirrors 26-1 to 26-n according to the optical output required for each wavelength. It is possible to adjust the power efficiency to the maximum. Further, the control unit 3B controls the phase adjustment by the phase adjustment units 25-1 to 25-n, thereby stabilizing the optical output of the multi-wavelength light source 2B and maximizing the power efficiency.
  • the control unit 3B adjusts the reflectance of the variable reflectance mirror 21 and the reflectance of the variable reflectance mirrors 26-1 to 26-n, respectively, so that the reflected Signal lights with wavelengths ⁇ 1 , ⁇ 2 , . . . , ⁇ i , . That is, when the signal light of wavelength ⁇ 1 is output from the variable reflectance mirror 26-1, the signal light of wavelength ⁇ 2 is subsequently output from the variable reflectance mirror 26-2, and similarly, the variable reflectance mirror After the signal light of wavelength ⁇ i is output from 26-i, the signal light of wavelength ⁇ n is output from reflectance variable mirror 26-n. As a result, signal lights with wavelengths ⁇ 1 , ⁇ 2 , . . . , ⁇ i , .
  • Modulators 27-1 to 27-n change the optical loss in the resonator for each wavelength, thereby changing the optical intensity of the signal light of each wavelength ⁇ i to realize intensity modulation.
  • a modulator provided outside a resonator modulates signal light separated for each wavelength, and a wavelength multiplexer combines the modulated signal light for each wavelength.
  • the modulators 27-1 to 27-n provided in the resonator for each wavelength modulate the light, so that the multi-wavelength signal light is generated and the multi-wavelength signal light is transmitted. modulation can be performed at once.
  • the order of arrangement of the gain medium 24-i, the phase adjuster 25-i, and the modulator 27-i may be changed. That is, between the wavelength spectral filter 23 and the reflectance variable mirror 26-i, in what order are the gain medium 24-i, the phase adjuster 25-i, the modulator 27-i, and the phase adjuster 25-i arranged? may be Further, the gain media 24-1 to 24-n may be SOAs with III-V compound semiconductors bonded on Si platforms. Furthermore, the multi-wavelength light source 2B may be a planar waveguide system made of a glass-based material, or may be a planar waveguide system made of an InP-based material.
  • the optical module 1B includes n modulators 27-1 to 27-n provided for each wavelength and modulating light propagating in the resonator.
  • the modulators 27-1 to 27-n provided in the resonator for each wavelength modulate the light, so that the generation of the multi-wavelength signal light and the modulation of the multi-wavelength signal light are performed once. can be done.
  • FIG. 4 is a block diagram showing a configuration example of an optical module 1C according to the third embodiment.
  • an optical module 1C is an optical module that outputs multi-wavelength signal light at regular intervals, and includes a multi-wavelength light source 2C and a controller 3C.
  • the multi-wavelength light source 2C is a light source that outputs light of wavelengths ⁇ 1 to ⁇ n at regular intervals, and is, for example, a planar waveguide system on a silicon platform. , ⁇ i , . Light is oscillated at regular intervals.
  • the multi-wavelength light source 2C includes a variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n gain media 24-1 to 24-n, and n phase adjusters 25-1 to 25-n, n.
  • Components of the resonator for each wavelength are a variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n gain media 24-1 to 24-n, and n phase adjusters 25-1 to 25.
  • -n, n variable reflectance mirrors 26-1 to 26-n, n MZ modulators 28-1 to 28-n, wavelength monitors 29-1 to 29-n and power monitors 30-1 to 30- is n.
  • These components form a resonator between the variable reflectance mirror 21 and each of the n variable reflectance mirrors 26-1 to 26-n.
  • the variable reflectance mirror 21 is a first variable reflectance mirror that reflects the input light, and the reflectance is changed by the control unit 3C.
  • the variable reflectance mirror 21 is, for example, a loop mirror.
  • the periodic wavelength filter 22 is a filter having periodic peak wavelengths and is connected in series with the variable reflectance mirror 21 via an optical transmission line. The peak wavelength of the light passed by the periodic wavelength filter 22 is changed by the controller 3C.
  • the periodic wavelength filter 22 is, for example, a ring resonator.
  • the wavelength spectral filter 23 is a filter that divides the input light of n wavelengths into light of each wavelength, and is connected in series with the periodic wavelength filter 22 via an optical transmission line. The spectral operation by the wavelength spectral filter 23 is controlled by the controller 3C.
  • the wavelength spectral filter 23 is AWG, for example.
  • the period of the peak wavelength of the periodic wavelength filter 22 and the period of the wavelength of the light split by the wavelength spectral filter 23 are set to match each other.
  • the gain media 24-1 to 24-n are provided for each wavelength, are gain media having different wavelength characteristics, and amplify light of n wavelengths with gains set by the control unit 3C.
  • gain media 24-1 through 24-n are SOAs.
  • the phase adjustment units 25-1 to 25-n are provided for each wavelength and are components for adjusting the phase of light of each wavelength, such as micro-heaters.
  • the phase adjusters 25-1 to 25-n adjust the phase of the input light to the phase instructed by the controller 3C.
  • the variable reflectance mirrors 26-1 to 26-n are provided for each wavelength and are second variable reflectance mirrors that reflect light of each wavelength, such as loop mirrors. The reflectance of each of the reflectance variable mirrors 26-1 to 26-n is changed by the controller 3C.
  • the MZ modulators 28-1 to 28-n are provided for each wavelength and modulate the signal light propagating inside the resonator.
  • the MZ modulators 28-1 to 28-n are, for example, modulators that modulate the intensity of input light under the control of the controller 3C.
  • the MZ modulators 28-1 to 28-n are modulators with two directional couplers and two phase adjusters.
  • the phase adjustment unit 25-i is connected to one of the four ports of the MZ modulator 28-i, and the port connected to the port inside the MZ modulator 28-i is a variable reflectance mirror. 26-i are connected. Further, a wavelength monitor 29-i is connected to the remaining port of the MZ modulator 28-i, and a power monitor 30-i is connected to the port connected to the port inside the MZ modulator 28-i. is connected.
  • Wavelength monitors 29-1 to 29-n are provided for each wavelength and observe the wavelength of light propagating through the resonator. Information indicating the wavelengths of light observed by the wavelength monitors 29-1 to 29-n is output to the controller 3C.
  • the wavelength monitors 29-1 to 29-n are composed of ring resonators and optical receivers.
  • Power monitors 30-1 to 30-n are provided for each wavelength and observe the intensity of light propagating through the resonator. Information indicating the intensity of light observed by the power monitors 30-1 to 30-n is output to the controller 3C.
  • the power monitors 30-1 to 30-n are light receivers.
  • the wavelength spectral filter 23 whose periodic interval of the periodic wavelength filter 22 and the spectral period of the wavelength match, splits the signal light of wavelength ⁇ 1 into the gain medium 24-1, but the signal light of wavelength ⁇ 1 is arranged periodically.
  • the signal light of wavelength ⁇ i is not split into the gain medium 24-1.
  • the wavelength spectral filter 23 splits the light of the wavelength ⁇ i other than the wavelength ⁇ 1 to the gain medium 24-i when the periodic wavelength filter 22 reaches the peak wavelength period of the wavelength ⁇ i .
  • the signal light of wavelength ⁇ 1 separated by the gain medium 24-1 is input to the modulator 27-1 through the phase adjuster 25-1.
  • the signal lights of wavelengths ⁇ i other than the wavelength ⁇ 1 separated by the gain medium 24-i and periodically arranged are input to the MZ modulator 28-i through the phase adjuster 25-i.
  • the MZ modulator 28-1 modulates the signal light of wavelength ⁇ 1 .
  • the signal light of wavelength ⁇ 1 modulated by the MZ modulator 28-1 is reflected by the reflectance variable mirror 26-1 and returns to the reflectance variable mirror 21 side again.
  • the signal light of wavelength ⁇ i modulated by the MZ modulator 28-i passes through the phase adjuster 25-i, is reflected by the variable reflectance mirror 26-i, and returns to the variable reflectance mirror 21 side again.
  • a resonator for each wavelength is formed between the reflectance variable mirror 21 and the reflectance variable mirrors 26-1 to 26-n. Focusing on a resonator for each wavelength, for example, a resonator for only one wavelength, the resonator has a configuration of a so-called single-mode laser.
  • the wavelengths ⁇ i output from the multi-wavelength light source 2C are defined at regular intervals by the periodic wavelength filter 22 . Therefore, by using the optical module 1C, a light source that oscillates light of a plurality of wavelengths at regular intervals, which is required for WDM, can be easily realized without using a wavelength locker.
  • the multi-wavelength laser described in Patent Document 1 needs to bundle each wavelength using a wavelength multiplexer. There is no need to separately prepare a wavelength multiplexer.
  • the gain media 24-1 to 24-n are configured with mutually different wavelength characteristics, that is, mutually different gain structures, so that the oscillation efficiency of each wavelength can be improved.
  • the wavelength difference between ⁇ 1 and ⁇ 40 exceeds 30 nm.
  • the gain medium 24-1 has an active layer structure that maximizes the gain at the wavelength ⁇ 1
  • the gain medium 24-40 has an active layer structure that maximizes the gain at the wavelength ⁇ 40 .
  • the optical output with the maximum power efficiency differs for each reflectance of the mirrors that make up the resonator.
  • the controller 3C controls the reflectance of the variable reflectance mirror 21 and the variable reflectance mirrors 26-1 to 26-n according to the optical output required for each wavelength. It is possible to adjust the power efficiency to the maximum.
  • the control unit 3C controls the phase adjustment by the phase adjustment units 25-1 to 25-n, thereby stabilizing the optical output of the multi-wavelength light source 2C and maximizing the power efficiency.
  • the control unit 3C adjusts the reflectance of the variable reflectance mirror 21 and the reflectance of the variable reflectance mirrors 26-1 to 26-n, respectively, so that the reflection Signal lights with wavelengths ⁇ 1 , ⁇ 2 , . . . , ⁇ i , . That is, when the signal light of wavelength ⁇ 1 is output from the variable reflectance mirror 26-1, the signal light of wavelength ⁇ 2 is subsequently output from the variable reflectance mirror 26-2, and similarly, the variable reflectance mirror After the signal light of wavelength ⁇ i is output from 26-i, the signal light of wavelength ⁇ n is output from reflectance variable mirror 26-n. As a result, signal lights with wavelengths ⁇ 1 , ⁇ 2 , . . . , ⁇ i , .
  • the MZ modulators 28-1 to 28-n change the optical loss in the resonator for each wavelength, thereby changing the optical intensity of the signal light of each wavelength ⁇ i and realizing intensity modulation.
  • a modulator provided outside a resonator modulates signal light separated for each wavelength, and a wavelength multiplexer combines the modulated signal light for each wavelength.
  • the MZ modulators 28-1 to 28-n provided in the resonator for each wavelength modulate light, so that multi-wavelength signal light is generated and multi-wavelength signal light is generated. can be performed at once.
  • Wavelength monitors 29-1 to 29-n and power monitors 30-1 to 30-n are connected to two ports of the MZ modulators 28-1 to 28-n.
  • the MZ modulator 28-i changes the light propagating through the resonator at high speed, and the changed light is output from the remaining ports.
  • the light extracted from the resonator at high speed is monitored for light intensity by the power monitor 30-i, which is a low speed light receiver.
  • the wavelength monitor 29-i is provided before the power monitor 30-i, which is a low-speed light receiver, and observes the wavelength of light propagating through the resonator. These observed values are output to the control section 3C.
  • the controller 3C can control the characteristics of the resonator for each wavelength based on the intensity of light propagating through the resonator for each wavelength.
  • the order of arrangement of the gain medium 24-i, the phase adjuster 25-i and the MZ modulator 28-i may be changed.
  • the gain medium 24-i in what order are the gain medium 24-i, the phase adjustment unit 25-i, the MZ modulator 28-i, and the phase adjustment unit 25-i may be placed.
  • the gain media 24-1 to 24-n may be SOAs with III-V compound semiconductors bonded on Si platforms.
  • the multi-wavelength light source 2C may be a planar waveguide system made of a glass-based material, or may be a planar waveguide system made of an InP-based material.
  • the MZ modulators 28-1 to 28-n may be composed of two directional couplers and one phase adjustment section. Also, the MZ modulators 28-1 to 28-n may be composed of two MMIs (Multi Mode Interferometers) and two phase adjusters. Furthermore, the MZ modulators 28-1 to 28-n may be configured with two MMIs and one phase adjuster. Furthermore, the MZ modulators 28-1 to 28-n may be composed of directional couplers and ring resonators.
  • the positions of the port connected to the wavelength monitor 29-i and the port connected to the power monitor 30-i shown in FIG. 4 may be reversed.
  • the power monitor 30-i may be connected to the port on the phase adjustment section side of the MZ modulator 28-i
  • the wavelength monitor 29-i may be connected to the port on the reflectance variable mirror 26-i side.
  • the optical module 1C includes n wavelength monitors 29-1 to 29-n provided for each wavelength and observing the wavelength of light propagating through the resonator, and It is provided with n power monitors 30-1 to 30-n for observing the intensity of light propagating through the resonator.
  • the controller 3C can control the characteristics of the resonator for each wavelength based on the intensity of light propagating in the resonator for each wavelength.
  • FIG. 5 is a block diagram showing a configuration example of an optical module 1D according to the fourth embodiment.
  • an optical module 1D is an optical module that outputs multi-wavelength signal light at regular intervals, and includes a multi-wavelength light source 2D and a controller 3D.
  • the multi-wavelength light source 2D is a light source that outputs light with wavelengths ⁇ 1 to ⁇ n at regular intervals, and is, for example, a planar waveguide system on a silicon platform.
  • the control unit 3D controls the characteristics of the constituent elements constituting the resonator for each wavelength in the multi-wavelength light source 2D, so that the wavelengths ⁇ 1 , ⁇ 2 , . Light is oscillated at regular intervals.
  • the multi-wavelength light source 2D includes a variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n gain media 24-1, 24-2, . 25-1 to 25-n, n variable reflectance mirrors 26-1 to 26-n, n MZ modulators 28-1 to 28-n, wavelength power monitors 31-1 to 31-n, return light It has monitors 32-1 to 32-n and a wavelength multiplexing filter 33.
  • FIG. 1 variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n gain media 24-1, 24-2, . 25-1 to 25-n, n variable reflectance mirrors 26-1 to 26-n, n MZ modulators 28-1 to 28-n, wavelength power monitors 31-1 to 31-n, return light It has monitors 32-1 to 32-n and a wavelength multiplexing filter 33.
  • Components of the resonator for each wavelength are a variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n gain media 24-1 to 24-n, and n phase adjusters 25-1 to 25. -n, and n variable reflectance mirrors 26-1 to 26-n. These components form a resonator between the variable reflectance mirror 21 and each of the n variable reflectance mirrors 26-1 to 26-n.
  • the variable reflectance mirror 21 is a first variable reflectance mirror that reflects the input light, and the reflectance is changed by the controller 3D.
  • the variable reflectance mirror 21 is, for example, a loop mirror.
  • the periodic wavelength filter 22 is a filter having periodic peak wavelengths and is connected in series with the variable reflectance mirror 21 via an optical transmission line. The peak wavelength of the light passed by the periodic wavelength filter 22 is changed by the controller 3D.
  • the periodic wavelength filter 22 is, for example, a ring resonator.
  • the wavelength spectral filter 23 is a filter that divides the input light of n wavelengths into light of each wavelength, and is connected in series with the periodic wavelength filter 22 via an optical transmission line. The spectral operation by the wavelength spectral filter 23 is controlled by the controller 3D.
  • the wavelength spectral filter 23 is AWG, for example.
  • the period of the peak wavelength of the periodic wavelength filter 22 and the period of the wavelength of the light split by the wavelength spectral filter 23 are set to match each other.
  • the gain media 24-1 to 24-n are gain media having different wavelength characteristics, and each amplify light of n wavelengths with the gain set by the controller 3D.
  • gain media 24-1 through 24-n are SOAs.
  • the phase adjusters 25-1 to 25-n are components for adjusting the phase of light of each wavelength, and are microheaters, for example.
  • the phase adjusters 25-1 to 25-n adjust the phase of the input light to the phase instructed by the controller 3D.
  • the variable reflectance mirrors 26-1 to 26-n are second variable reflectance mirrors that reflect light of each wavelength, and are loop mirrors, for example. The reflectance of each of the reflectance variable mirrors 26-1 to 26-n is changed by the controller 3D.
  • the MZ modulators 28-1 to 28-n are provided for each wavelength and modulate the signal light propagating inside the resonator.
  • the MZ modulators 28-1 to 28-n are modulators that modulate the intensity of input light under the control of the controller 3D.
  • the MZ modulators 28-1 to 28-n are modulators with two directional couplers and two phase adjusters.
  • a variable reflectance mirror 26-i is connected to one of the four ports of the MZ modulator 28-i, and the port connected to this port inside the MZ modulator 28-i has a wavelength
  • a multiplexing filter 33 is connected.
  • a wavelength power monitor 31-i is connected to the remaining port of the MZ modulator 28-i. -i is connected.
  • Wavelength power monitors 31-1 to 31-n are provided for each wavelength and observe the intensity of light of each wavelength.
  • the wavelength power monitor 31-i observes the intensity of light output from the MZ modulator 28-1 for each wavelength.
  • Information indicating the light intensity of each wavelength observed by the wavelength power monitor 31-i is output to the controller 3D.
  • the wavelength power monitors 31-1 to 31-n are also composed of a branching directional coupler, a ring resonator, and two light receivers.
  • the return light monitors 32-1 to 32-n are provided for each wavelength and observe the intensity of light returning from the transmission line to the outputs of the MZ modulators 28-1 to 28-n.
  • wavelength power monitor 31-1 monitors the intensity of light returning from the transmission line to the output of MZ modulator 28-1.
  • Information indicating the intensity of the light observed by the returned light monitors 32-1 to 32-n is output to the controller 3D.
  • the return light monitors 32-1 to 32-n are light receivers.
  • the wavelength spectral filter 23 whose periodic interval of the periodic wavelength filter 22 and the spectral period of the wavelength match, splits the signal light of wavelength ⁇ 1 into the gain medium 24-1, but the signal light of wavelength ⁇ 1 is arranged periodically.
  • the signal light of wavelength ⁇ i is not split into the gain medium 24-1.
  • the wavelength spectral filter 23 splits the light of the wavelength ⁇ i other than the wavelength ⁇ 1 to the gain medium 24-i when the periodic wavelength filter 22 reaches the peak wavelength period of the wavelength ⁇ i .
  • the signal light of wavelength ⁇ 1 separated by the gain medium 24-1 passes through the phase adjuster 25-1, is reflected by the reflectance variable mirror 26-1, and returns to the reflectance variable mirror 21 side again.
  • the signal light of wavelengths ⁇ i other than the wavelength ⁇ 1 which is separated by the gain medium 24-i and periodically arranged, passes through the phase adjustment section 25-i, is reflected by the reflectance variable mirror 26-i, and is reflected again. Return to the variable index mirror 21 side.
  • a resonator for each wavelength is formed between the reflectance variable mirror 21 and the reflectance variable mirrors 26-1 to 26-n.
  • the resonator for each wavelength for example, focusing on a resonator for only one wavelength, the resonator has a configuration of a so-called single-mode laser.
  • the multi-wavelength light source 2D since the multi-wavelength light source 2D has a resonator for each wavelength, mode competition does not occur in the gain media 24-1 to 24-n. Furthermore, by controlling the current injection to the gain medium 24-i by the control unit 3D, it is also possible to adjust the intensity of the signal light output by the multi-wavelength light source 2D for each wavelength.
  • the wavelengths ⁇ i output from the multi-wavelength light source 2D are defined at regular intervals by the periodic wavelength filter 22 . Therefore, by using the optical module 1D, a light source that oscillates light of a plurality of wavelengths at regular intervals, which is required for WDM, can be easily realized without using a wavelength locker.
  • the multi-wavelength laser described in Patent Document 1 needs to bundle each wavelength using a wavelength multiplexer. There is no need to separately prepare a wavelength multiplexer.
  • the gain media 24-1 to 24-n are configured with mutually different wavelength characteristics, that is, mutually different gain structures, so that the oscillation efficiency of each wavelength can be improved.
  • the wavelength difference between ⁇ 1 and ⁇ 40 exceeds 30 nm.
  • the gain medium 24-1 has an active layer structure that maximizes the gain at the wavelength ⁇ 1
  • the gain medium 24-40 has an active layer structure that maximizes the gain at the wavelength ⁇ 40 .
  • the optical module 1D can maximize power efficiency at each wavelength.
  • the optical output that maximizes the power efficiency differs for each reflectance of the mirrors that make up the resonator.
  • the controller 3D controls the reflectance of the variable reflectance mirror 21 and the variable reflectance mirrors 26-1 to 26-n according to the optical output required for each wavelength. It is possible to adjust the power efficiency to the maximum. Further, the control unit 3D controls the phase adjustment by the phase adjustment units 25-1 to 25-n, thereby stabilizing the optical output of the multi-wavelength light source 2D and maximizing the power efficiency.
  • MZ modulators 28-1 to 28-n are connected to the variable reflectance mirrors 26-1 to 26-n via optical transmission lines.
  • the variable reflectance mirrors 26-1 to 26-n forming the resonators for each wavelength are connected in series to the MZ modulators 28-1 to 28-n provided outside the resonators.
  • the MZ modulators 28-1 to 28-n are connected to wavelength multiplexing filters 33, respectively.
  • the control unit 3D adjusts the reflectance of the variable reflectance mirror 21 and the reflectance of the variable reflectance mirrors 26-1 to 26-n, respectively, so that the variable reflectance mirrors 26-1 to 26- Signal lights of wavelengths ⁇ 1 , ⁇ 2 , . . . , ⁇ i , .
  • Wavelength power monitors 31-1 to 31-n and return light monitors 32-1 to 32-n are connected to two ports of the MZ modulators 28-1 to 28-n.
  • the MZ modulator 28-i changes the light propagating through the resonator at high speed, and the changed light is output from the remaining ports.
  • the wavelength power monitor 31-i has two optical receivers, a slow optical receiver and a slow optical receiver via a wavelength filter.
  • the MZ modulator 28-i splits the high-speed intensity-modulated light into two, the intensity of one light is observed by the low-speed light receiver of the wavelength power monitor 31-i, and the other light is detected. , observed by a slow receiver through a wavelength filter.
  • the lights of respective wavelengths modulated by the MZ modulators 28-1 to 28-n are multiplexed by the wavelength multiplexing filter 33, and the wavelengths ⁇ 1 , ⁇ 2 , . . . , ⁇ i , . , ⁇ n from the multi-wavelength light source 2D. Also, the intensity of the light coming from the optical transmission line is monitored by the returned light monitor 32-i.
  • the order of arrangement of the gain medium 24-i and the phase adjustment section 25-i may be changed.
  • the gain medium 24-i may be arranged between the phase adjuster 25-i and the reflectance variable mirror 26-i.
  • the gain media 24-1 to 24-n may be SOAs with III-V compound semiconductors bonded on Si platforms.
  • the multi-wavelength light source 2C may be a planar waveguide system made of a glass-based material, or may be a planar waveguide system made of an InP-based material.
  • the MZ modulators 28-1 to 28-n may be composed of two directional couplers and one phase adjustment section. Also, the MZ modulators 28-1 to 28-n may be composed of two MMIs and two phase adjusters. Furthermore, the MZ modulators 28-1 to 28-n may be configured with two MMIs and one phase adjuster. Furthermore, the MZ modulators 28-1 to 28-n may be composed of directional couplers and ring resonators.
  • the optical module 1D includes the MZ modulators 28-i that are provided for each wavelength and modulate the light propagating through the resonator, A return light monitor 32-i for observing the intensity of light returning to the output of the device 28-i, a wavelength power monitor 31-i provided for each wavelength for observing the intensity of light of each wavelength, and an MZ modulator 28- A wavelength multiplexing filter 33 is provided for synthesizing and outputting light of each wavelength modulated by i.
  • the controller 3D can control the characteristics of the resonator for each wavelength based on the intensity of light propagating in the resonator for each wavelength.
  • FIG. 6 is a block diagram showing the configuration of a multi-wavelength optical communication system 4 according to the fifth embodiment.
  • a multi-wavelength optical communication system 4 is an optical communication system for transmitting and receiving signal light of n wavelengths, and includes an optical module 1 , a multi-wavelength receiver 5 and an optical transmission line 6 .
  • n is a positive natural number.
  • an optical module 1 is connected to a multi-wavelength receiver 5 via an optical transmission line 6 .
  • the optical module 1 includes a multi-wavelength light source 2 and a controller 3 .
  • the multi-wavelength light source 2 outputs signal lights of wavelengths ⁇ 1 to ⁇ n at regular intervals, and is, for example, a planar waveguide system on a silicon platform.
  • the control unit 3 controls the characteristics of the constituent elements that constitute the resonator for each wavelength in the multi-wavelength light source 2, so that the wavelengths ⁇ 1 , ⁇ 2 , . Light is oscillated at regular intervals.
  • FIG. 6 shows the case where the communication partner of the multi-wavelength receiver 5 is the optical module 1, it may be the optical modules 1A to 1D shown in the first to fourth embodiments.
  • FIG. 7 is a block diagram showing the configuration of the multi-wavelength receiver 5 included in the multi-wavelength optical communication system 4.
  • the multi-wavelength receiver 5 is connected to the optical module 1 via the optical transmission line 6, and the wavelengths ⁇ 1 , ⁇ 2 , . . . , ⁇ i , .
  • An optical receiver for receiving light at ⁇ n for example a planar waveguide system on a silicon platform.
  • the multi-wavelength receiver 5 also includes n light receivers 51-1 to 51-n, variable reflectance mirrors 52-1 to 52-n, a wavelength spectral filter 53, and a controller 3.
  • FIG. 1 light receivers 51-1 to 51-n
  • variable reflectance mirrors 52-1 to 52-n variable reflectance mirrors 52-1 to 52-n
  • a wavelength spectral filter 53 a controller 3.
  • the light receivers 51-1 to 51-n are provided for each wavelength and receive signal light of each wavelength.
  • the light receivers 51-1 to 51-n convert the received signal light into electrical signals and output the electrical signals to the controller 3.
  • the photodetectors 51-1 to 51-n are semiconductor photodetectors.
  • the variable reflectance mirrors 52-1 to 52-n are variable reflectance mirrors that reflect light of each wavelength, and are loop mirrors, for example. The reflectance of each of the reflectance variable mirrors 52-1 to 52-n is changed by the controller 3. FIG.
  • the control unit 3 controls the spectral operation of the wavelength spectral filter 53 .
  • the wavelength spectral filter 53 is, for example, AWG.
  • the period of the wavelength of the light divided by the wavelength spectral filter 53 is set to match the period of the peak wavelength of the periodic wavelength filter 22 shown in the first to fourth embodiments.
  • Light of each wavelength separated by the wavelength spectral filter 53 passes through the variable reflectance mirror 52-i and reaches the light receiver 51-i.
  • the controllers 3, 3A to 3D adjust the characteristics of the resonator for each wavelength, thereby controlling the multi-wavelength light sources 2, 2A to
  • the reflectance of the variable reflectance mirror 21 and the variable reflectance mirrors 26-1 to 26-n are adjusted so that the light output from 2D can be changed and the power efficiency is maximized according to the light output.
  • the multi-wavelength light source 2 provided in the optical module 1 transmits transmission light to the multi-wavelength receiver 5 via the optical transmission line 6 .
  • the transmitted light is a signal in which lights of wavelengths ⁇ 1 , ⁇ 2 , . . . , ⁇ i , .
  • the control unit 3 sets the reflectance variable mirrors 52-1 to 52-n provided in the multi-wavelength receiver 5 to 100% reflectance.
  • the transmission light transmitted from the multi-wavelength light source 2 provided in the optical module 1 to the multi-wavelength receiver 5 via the optical transmission line 6 is attenuated by the loss of the optical transmission line 6 and returns to the multi-wavelength light source 2 .
  • the controller 3 calculates the loss of light in the optical transmission line 6 using the observed value of the light intensity of the reflected light that has returned to the multi-wavelength light source 2 .
  • the control unit 3 calculates the intensity of the optical output according to the modulation method from the loss of the optical transmission line 6, the current value to be applied to the gain medium 24-i, and the reflectance variable mirrors 21 and 26-1 to 26- Determine each reflectance of n.
  • FIG. 8 is a block diagram showing the configuration of a multi-wavelength optical communication system 4A, which is a modification of the multi-wavelength optical communication system 4.
  • a multi-wavelength optical communication system 4A shown in FIG. Prepare.
  • the communication partner of the optical module 1-1 and the multi-wavelength receiver 5-1 housed in the housing 7A is the optical module 1-2 and the multi-wavelength receiver housed in the housing 7B. 5-2.
  • the transmitted light transmitted by the optical module 1-1 is received by the multi-wavelength receiver 5-2 via the optical transmission line 6A.
  • the transmitted light transmitted by the optical module 1-2 is received by the multi-wavelength receiver 5-1 via the optical transmission line 6B.
  • Optical transmission system composed of optical module 1-1, optical transmission line 6A and multi-wavelength receiver 5-2, and light composed of optical module 1-2, optical transmission line 6B and multi-wavelength receiver 5-1 It is assumed that the transmission systems are substantially the same.
  • the controller 3 determines in advance the intensity of the output light from the multi-wavelength light source 2 provided in the optical module 1-1 or 1-2. For example, when the intensity of light output from the multi-wavelength light source 2 included in the optical module 1-1 is determined in advance, the control unit 3 controls the intensity of the light received by the multi-wavelength receiver 5-2 from the optical module 1-1. , and the predetermined light intensity, the loss of the signal light in the optical transmission line 6A is calculated. Furthermore, since the optical transmission systems described above are substantially the same, the controller 3 uses the intensity of light received by the multi-wavelength receiver 5-1 from the optical module 1-2 and the intensity of light determined in advance.
  • the loss of the signal light in the optical transmission line 6B is calculated.
  • the controller 3 uses the loss of light in the optical transmission lines 6A and 6B, calculates the optical output intensity according to the modulation scheme in the optical modules 1-1 and 1-2. Then, using the calculated optical output intensity, the control unit 3 determines current values to be applied to the gain media 24-1 to 24-n, and reflectances of the variable reflectance mirrors 21 and 26-1 to 26-n. to decide.
  • the multi-wavelength optical communication system 4 is connected to the optical module 1 via the optical module 1, the optical transmission line 6, and the optical transmission line 6, and the optical module 1 outputs and a multi-wavelength receiver 5 for receiving signal light of each wavelength. From the optical module 1, it is possible to provide a multi-wavelength optical communication system 4 capable of controlling the output of light for each wavelength without affecting the output of light of multiple wavelengths.
  • the controller 3 controls the light that is output from the optical module 1 to the multi-wavelength receiver 5, is reflected by the multi-wavelength receiver 5, and returns to the optical module 1. is used to calculate the loss of the signal light in the optical transmission line 6, and the characteristics of the resonator for each wavelength are controlled based on the calculated loss.
  • the controller 3 calculates the loss of light in the optical transmission line 6 using the observed value of the light intensity of the reflected light that has returned to the multi-wavelength light source 2 .
  • the control unit 3 calculates the loss of the optical transmission line 6 using the observed value of the light intensity of the reflected light returning to the multi-wavelength light source 2, and based on the calculated loss, changes the current applied to the gain medium 24-i.
  • the control unit 3 uses the intensity of the light received by the multi-wavelength receiver 5-2 from the optical module 1-1 via the optical transmission line 6A to A loss of light in the transmission line 6A is calculated.
  • the controller 3 uses the intensity of light received by the multi-wavelength receiver 5-1 from the optical module 1-2 via the optical transmission line 6B to calculate the loss of light in the optical transmission line 6B.
  • the controller 3 calculates the loss of light in the optical transmission line 6A using the observed value of the intensity of the light received by the multi-wavelength receiver 5-2, and calculates the intensity of the light received by the multi-wavelength receiver 5-1. is used to calculate the loss of light in the optical transmission line 6B.
  • the controller 3 adjusts the current applied to the gain medium 24-i and the reflectances of the variable reflectance mirrors 21 and 26-i based on the loss of light in the optical transmission line 6A or 6B. , can be controlled to maximize stabilization and power efficiency of the optical output of the cavity per wavelength.
  • FIG. 9 is a block diagram showing a configuration example of an optical module 1E according to the sixth embodiment.
  • an optical module 1E is an optical module that outputs multi-wavelength signal light at regular intervals, and includes a multi-wavelength light source 2E and a controller 3E.
  • the multi-wavelength light source 2E is a light source that outputs light with wavelengths ⁇ 1 to ⁇ n at regular intervals, and is, for example, a planar waveguide system on a silicon platform.
  • the control unit 3E controls the characteristics of the constituent elements constituting the resonator for each wavelength in the multi-wavelength light source 2E, so that the wavelengths ⁇ 1 , ⁇ 2 , . Light is oscillated at regular intervals.
  • the multi-wavelength light source 2E includes a variable reflectance mirror 21, a periodic wavelength filter 22, a wavelength spectral filter 23, n phase adjustment units 25-1 to 25-n, n demultiplexers 34-1 to 34-n, n phase adjusters 35-1 to 35-n, n phase adjusters 35A-1 to 35A-n, n multiplexers 36-1 to 36-n, and n wavelength monitors 37-1 37-n, power monitors 38-1 to 38-n, n gain media 39-1 to 39-n, and n variable reflectance mirrors 40-1 to 40-n.
  • the variable reflectance mirror 21 is a first variable reflectance mirror that reflects the input light, and the reflectance is changed by the controller 3E.
  • the variable reflectance mirror 21 is a loop mirror.
  • the periodic wavelength filter 22 is a filter having periodic peak wavelengths and is connected in series with the variable reflectance mirror 21 via an optical transmission line. The peak wavelength of the light passed by the periodic wavelength filter 22 is changed by the controller 3E.
  • the periodic wavelength filter 22 is a ring resonator.
  • the wavelength spectral filter 23 is a filter that divides the input light of n wavelengths into light of each wavelength, and is connected in series with the periodic wavelength filter 22 via an optical transmission line. The spectral operation of the wavelength spectral filter 23 is controlled by the controller 3E.
  • the wavelength spectral filter 23 is AWG. The period of the peak wavelength of the periodic wavelength filter 22 and the period of the wavelength of the light split by the wavelength spectral filter 23 are set to match each other.
  • the phase adjustment units 25-1 to 25-n are provided for each wavelength and are components for adjusting the phase of light of each wavelength, such as micro-heaters.
  • the phase adjusters 25-1 to 25-n adjust the phase of the input light to the phase instructed by the controller 3E.
  • the demultiplexers 34-1 to 34-n divide the signal lights output from the phase adjusters 25-1 to 25-n into phase adjusters 35-1 to 35-n and phase adjusters 35A-1 to 35A. -n and wavelength monitors 37-1 to 37-n.
  • the demultiplexers 34-1 to 34-n are, for example, directional couplers.
  • the phase adjusters 35-1 to 35-n are provided for each wavelength and are components for adjusting the phase of light of each wavelength, and are, for example, pin-type phase modulators.
  • the phase adjusters 35A-1 to 35A-n are provided for each wavelength and are components for adjusting the phase of light of each wavelength, such as pin-type phase modulators.
  • the multiplexers 36-1 to 36-n combine the signal lights output from the phase adjustment sections 35-1 to 35-n and the signal lights output from the phase adjustment sections 35A-1 to 35A-n. do.
  • multiplexers 36-1 to 36-n are directional couplers. The lights combined by the multiplexers 36-1 to 36-n are output to gain media 39-1 to 39-n provided outside the platform of the multi-wavelength light source 2E.
  • the branching filters 34-1 to 34-n, the phase adjusting units 35-1 to 35-n, the phase adjusting units 35A-1 to 35A-n, and the multiplexers 36-1 to 36-n 3 and the MZ modulator shown in the fourth embodiment changes the optical loss in the cavity for each wavelength, thereby changing the optical intensity of the signal light of each wavelength ⁇ i and realizing multi-wavelength intensity modulation. be.
  • the gain media 39-1 to 39-n are provided for each wavelength outside the platform of the multi-wavelength light source 2E and have different wavelength characteristics.
  • gain media 39-1 through 39-n are SOAs.
  • the gain media 39-1 to 39-n amplify light of n wavelengths with gains set by the controller 3E.
  • Signal lights of respective wavelengths output from the gain media 39-1 to 39-n are output to the variable reflectance mirrors 40-1 to 40-n and reflected by the variable reflectance mirrors 40-1 to 40-n. It returns to multiplexers 36-1 to 36-n through gain media 39-1 to 39-n.
  • the multiplexers 36-1 to 36-n combine the signal lights returned from the gain media 39--1 to 39-n into phase adjusters 35-1 to 35-n and phase adjusters 35A-1 to 35A-. n.
  • the signal light of each wavelength returns to the variable reflectance mirror 21 side, and a resonator for each wavelength is formed between the variable reflectance mirror 21 and the variable reflectance mirrors 40-1 to 40-n.
  • demultiplexers 34-1 to 34-n and the multiplexers 36-1 to 36-n may be MMIs, for example.
  • Gain media 39-1 to 39-n may be fiber amplifiers connected to multi-wavelength light source 2E.
  • the gain media 39-1 to 39-n are provided outside the multi-wavelength light source 2E, and the light output from the gain media 39-1 to 39-n is It has reflectance variable mirrors 40-1 to 40-n. Thereby, a resonator for each wavelength is formed between the reflectance variable mirror 21 and the reflectance variable mirrors 40-1 to 40-n. , the optical module 1E can control the light output for each wavelength without affecting the light output of a plurality of wavelengths.
  • An optical module according to the present disclosure can be used, for example, in a WDM optical communication system.

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  • Lasers (AREA)

Abstract

Dans la présente invention, un module optique (1) comprend : un premier miroir à réflectance variable (21) ; un filtre de longueur d'onde périodique (22) ; un filtre spectral de longueur d'onde (23) ; des milieux de gain (24-1 à 24-n) ménagés pour chaque longueur d'onde, ayant des caractéristiques de longueur d'onde mutuellement différentes ; des unités de réglage de phase (25-1 à 25-n) ménagées pour chaque longueur d'onde, et conçues pour régler la phase de la lumière de chaque longueur d'onde ; des seconds miroirs à réflectance variable (26-1 à 26-n) ménagés pour chaque longueur d'onde, et conçus pour réfléchir la lumière de chaque longueur d'onde ; et une unité de commande (3) qui commande les caractéristiques de résonateur pour chaque longueur d'onde à l'aide du premier miroir à réflectance variable (21), du filtre de longueur d'onde périodique (22), du filtre spectral de longueur d'onde (23), des milieux de gain (24-1 à 24-n), des unités de réglage de phase (25-1 à 25-n), et des seconds miroirs à réflectance variable (26-1 à 26-n), ladite unité de commande (3) étant formée entre le premier miroir à réflectance variable (21) et les seconds miroirs à réflectance variable (26-1 à 26-n).
PCT/JP2022/006816 2022-02-21 2022-02-21 Module optique et système de communication optique WO2023157269A1 (fr)

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JP2013205626A (ja) * 2012-03-28 2013-10-07 Fujitsu Ltd 波長合分波素子、多波長光源及び多波長光送信器
US20150236809A1 (en) * 2014-02-17 2015-08-20 Alcatel-Lucent Usa Inc. Multi-Wavelength Laser Apparatus And Methods
JP2018085475A (ja) * 2016-11-25 2018-05-31 富士通株式会社 多波長レーザ装置及び波長多重通信システム
JP2021068823A (ja) * 2019-10-24 2021-04-30 富士通株式会社 波長可変光源、これを用いた光伝送装置、及び波長可変光源の制御方法

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JP2013205026A (ja) 2012-03-27 2013-10-07 Hioki Ee Corp 基板検査装置および基板検査方法
US10135218B2 (en) 2015-10-02 2018-11-20 Ayar Labs, Inc. Multi-wavelength laser system for optical data communication links and associated methods
US10522968B2 (en) 2017-12-22 2019-12-31 Futurewei Technologies, Inc. Narrow linewidth multi-wavelength light sources

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* Cited by examiner, † Cited by third party
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JP2013205626A (ja) * 2012-03-28 2013-10-07 Fujitsu Ltd 波長合分波素子、多波長光源及び多波長光送信器
US20150236809A1 (en) * 2014-02-17 2015-08-20 Alcatel-Lucent Usa Inc. Multi-Wavelength Laser Apparatus And Methods
JP2018085475A (ja) * 2016-11-25 2018-05-31 富士通株式会社 多波長レーザ装置及び波長多重通信システム
JP2021068823A (ja) * 2019-10-24 2021-04-30 富士通株式会社 波長可変光源、これを用いた光伝送装置、及び波長可変光源の制御方法

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