WO2016062042A1 - Procédé et dispositif de compensation automatique d'une excursion de fréquence, et module optique cohérent - Google Patents

Procédé et dispositif de compensation automatique d'une excursion de fréquence, et module optique cohérent Download PDF

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Publication number
WO2016062042A1
WO2016062042A1 PCT/CN2015/076909 CN2015076909W WO2016062042A1 WO 2016062042 A1 WO2016062042 A1 WO 2016062042A1 CN 2015076909 W CN2015076909 W CN 2015076909W WO 2016062042 A1 WO2016062042 A1 WO 2016062042A1
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WIPO (PCT)
Prior art keywords
frequency
value
light source
threshold
adjustable light
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PCT/CN2015/076909
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English (en)
Chinese (zh)
Inventor
李晶
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中兴通讯股份有限公司
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Publication of WO2016062042A1 publication Critical patent/WO2016062042A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/61—Coherent receivers

Definitions

  • This paper relates to the field of communications, and in particular to a method and device for automatically offsetting frequency deviation and a coherent optical module.
  • the dual-light source scheme is limited.
  • the power consumption and cost compression space of the dual-source are limited. Only one light source (laser) or single-light source scheme can be used, which can reduce power consumption, reduce cost, and facilitate small module.
  • the single-light source technology that realizes T-bit optical transmission will become a hot spot and development direction in the future.
  • frequency deviation is unavoidable throughout the life cycle.
  • the frequency deviation exceeds the range that the internal algorithm chip of the coherent optical transceiver module can tolerate, the module may lose lock and cause service interruption.
  • the frequency of the local oscillator needs to be adjusted to eliminate the deviation.
  • the local oscillator light source is the receiving side light source, and the frequency of the receiving side light source is finely adjusted, which does not affect the next-level system. As shown in FIG.
  • the local oscillator light source is a transmitting-side light source, and the frequency is adjusted, and the frequency of the transmitting side is also changed accordingly, thus affecting the next-level system.
  • this effect will also accumulate, resulting in instability of the entire system and business interruption.
  • the technical problem to be solved in this paper is to compensate the frequency deviation of the single-source optical module.
  • an embodiment of the present invention provides a frequency offset automatic compensation method, including:
  • the adjustable light source of the optical module When the absolute value of the frequency deviation value is greater than the threshold and the adjustable light source of the optical module is idle, the adjustable light source is controlled to adjust the frequency of the local oscillator light to perform frequency offset compensation.
  • controlling the adjustable light source to adjust the frequency of the local oscillator to perform frequency offset compensation includes:
  • the adjustable light source of the optical module When the absolute value of the frequency deviation value is greater than a threshold and the adjustable light source of the optical module is idle, comparing the frequency deviation value with the threshold, if the frequency deviation value is greater than the threshold, controlling the adjustable light source to decrease Describe the frequency of the local oscillator, and if the frequency deviation value is less than the threshold, controlling the adjustable light source to increase the frequency of the local oscillator.
  • the new frequency adjustment value is sent to the adjustable light source.
  • the frequency offset compensation is stopped when the adjustable light source is not idle or the absolute value of the frequency deviation value is less than or equal to a threshold, or an absolute value of the new frequency adjustment value is greater than an adjustment upper limit.
  • the embodiment of the invention further provides a frequency deviation automatic compensation device, comprising:
  • the reading module is configured to periodically read the frequency deviation between the received light of the optical module and the local oscillator,
  • the compensation control module is configured to adjust the frequency of the local oscillator to adjust the frequency offset when the absolute value of the frequency deviation value is greater than a threshold and the adjustable light source of the optical module is idle.
  • the compensation control module is set to:
  • the adjustable light source of the optical module When the absolute value of the frequency deviation value is greater than a threshold and the adjustable light source of the optical module is idle, comparing the frequency deviation value with the threshold, if the frequency deviation value is greater than the threshold, controlling the adjustable light source to decrease Describe the frequency of the local oscillator, and if the frequency deviation value is less than the threshold, controlling the adjustable light source to increase the frequency of the local oscillator.
  • the compensation control module is set to:
  • the new frequency adjustment value is sent to the adjustable light source.
  • An embodiment of the present invention further provides a coherent optical module, including an incident optical power detecting unit, a coherent receiver, a receiving dedicated integrated circuit ASIC, a controller, and a tunable light source;
  • the incident optical power detecting unit is configured to detect received optical power
  • the coherent receiver is connected to the incident optical power detecting unit, the receiving ASIC, and the adjustable light source, and the coherent receiver is configured to optically mix the incident optical signal and the local oscillator optical signal;
  • the receiving ASIC is connected to the controller and a coherent receiver, and the receiving ASIC is configured to estimate a frequency deviation value between the received light and the local oscillator light;
  • the controller is coupled to the ASIC and the adjustable light source, the controller is configured to periodically read a frequency offset value from the receiving ASIC, when the absolute value of the frequency offset value is greater than a threshold and the adjustable light source When idle, send an adjustment command to the adjustable light source;
  • the tunable light source is coupled to the controller and the coherent receiver, configured to generate a local oscillator signal, and adjust a frequency of the light source according to the adjustment command.
  • controller is set to:
  • the adjustable light source of the optical module When the absolute value of the frequency deviation value is greater than a threshold and the adjustable light source of the optical module is idle, comparing the frequency deviation value with the threshold, if the frequency deviation value is greater than the threshold, controlling the adjustable light source to decrease Describe the frequency of the local oscillator, and if the frequency deviation value is less than the threshold, controlling the adjustable light source to increase the frequency of the local oscillator.
  • controller is set to:
  • the new frequency adjustment value is sent to the adjustable light source.
  • the embodiment of the invention further provides a computer readable storage medium storing program instructions, which can be implemented when the program instructions are executed.
  • the solution of the embodiment of the present invention proposes to compare the frequency offset with the threshold to determine whether to start the adjustment algorithm.
  • the threshold value can ensure that the system service is normal, and the number of adjustments is limited. Therefore, moderate correction is performed to reduce the influence on the next-level system, and the adjustment step size can be used to reduce the instability of the system.
  • 1 is a schematic diagram of connection of a dual source optical module
  • FIG. 2 is a schematic diagram of connection of a single source optical module
  • FIG. 3 is a structural diagram of a coherent optical module according to an embodiment of the present invention.
  • Fig. 5 is a structural diagram of an automatic frequency offset compensating apparatus according to an embodiment of the present invention.
  • the coherent optical module of the embodiment of the present invention includes:
  • An incident optical power detecting unit 30, a coherent receiver 31, a receiving application specific integrated circuit (ASIC) 32, a controller 33, and a tunable light source 34 are included;
  • the incident optical power detecting unit 30 is configured to detect received optical power
  • the coherent receiver 31 is connected to the incident optical power detecting unit 30, the receiving ASIC 32, and the tunable light source 34, and the coherent receiver 31 is configured to optically mix the incident optical signal and the local oscillator optical signal. frequency;
  • the receiving ASIC 32 is coupled to the controller and a coherent receiver, the receiving ASIC being configured to estimate a frequency offset value between the received light and the local oscillator light;
  • the controller 33 is coupled to the ASIC 32 and the tunable light source 34, the controller 33 being configured to periodically read a frequency offset value from the receiving ASIC, when the absolute value of the frequency offset value is greater than a threshold And when the adjustable light source is idle, sending an adjustment instruction to the adjustable light source;
  • the adjustable light source 34 is connected to the controller 33 and the coherent receiver 32, and is configured to generate a local oscillator light signal and adjust the frequency of the light source according to the adjustment command.
  • controller 33 is configured to:
  • the adjustable light source of the optical module When the absolute value of the frequency deviation value is greater than a threshold and the adjustable light source of the optical module is idle, comparing the frequency deviation value with the threshold, if the frequency deviation value is greater than the threshold, controlling the adjustable light source to decrease Describe the frequency of the local vibration, if the frequency deviation value is less than the threshold, control the Adjusting the light source increases the frequency of the local oscillator.
  • controller 33 is configured to:
  • the new frequency adjustment value is sent to the adjustable light source.
  • the incident optical power detecting unit 30 may include an integrated power detector (IPM) and a dimmable optical attenuator (VOA).
  • IPM integrated power detector
  • VOA dimmable optical attenuator
  • the IPM splits the received incident light signal by 5% as the received optical power detection, and 95% of the split light is sent to the VOA.
  • the VOA is used to ensure that the incident light power at the high speed PD is constant.
  • the coherent receiver 31 may include a polarizing beam splitter (PBS), a power splitter, two 90 degree mixers, and two double balanced receivers.
  • PBS splits the incident signal light into two orthogonal polarization states, and respectively performs 90-degree optical mixing with the aliquoted local oscillator light (receiving the tunable light source).
  • Four pairs of balanced photodiodes are used to detect the output optical signal of a 90-degree optical mixer, and four pairs of differential linear transimpedance amplifiers are used to amplify the photoelectrically converted electrical signals.
  • the receiving ASIC 32 may include a high speed analog to digital conversion unit (ADC), a DSP demodulation unit, an SD-FEC decoding unit, and an SFI-S/OTL 4.10 serial to parallel conversion unit.
  • ADC analog to digital conversion unit
  • DSP unit demodulation unit
  • the demodulation unit realizes CD compensation, PMD compensation, polarization demultiplexing, frequency offset estimation, phase Partial estimation and data recovery; the output of the demodulation unit is sent to the SD-FEC decoding unit for SD-FEC decoding.
  • the controller 33 can adopt an MCU microcontroller.
  • the dimmable 34 source can adopt an integrated ITLA.
  • the automatic frequency offset compensation method of the embodiment of the present invention includes the following steps:
  • Step 401 Read the frequency deviation value of the received light from the local oscillator light at regular intervals;
  • Step 402 Determine whether the absolute value of the frequency deviation value is greater than a threshold. If yes, go to step 403. If no, end the current process.
  • Step 403 Determine whether the adjustable light source is idle. If yes, go to step 404. If no, the adjustable light source does not accept the adjustment command, and the process ends.
  • Step 404 Read a current frequency adjustment value of the adjustable light source, where the current frequency adjustment value is a difference between a current frequency of the local oscillator and an initial frequency;
  • Step 405 Determine whether the frequency deviation value is greater than the threshold, and if so, go to step 406, if no, go to step 407;
  • Step 406 The current frequency adjustment value is subtracted from the adjustment step value to obtain a new frequency adjustment value, step 408 is performed;
  • Step 407 Add the current frequency adjustment value to the adjustment step value to obtain a new frequency adjustment value.
  • Step 408 Determine whether the absolute value of the new frequency adjustment value is greater than the adjustment upper limit value, and if so, end the current process, if not, proceed to step 409;
  • Step 409 Send the new frequency adjustment value to the adjustable light source, and end the current process.
  • FIG. 5 is a schematic structural diagram of an automatic frequency offset compensation apparatus according to an embodiment of the present invention, where the apparatus includes:
  • the reading module is configured to periodically read the frequency deviation between the received light of the optical module and the local oscillator,
  • the compensation control module is configured to adjust the frequency of the local oscillator to adjust the frequency offset when the absolute value of the frequency deviation value is greater than a threshold and the adjustable light source of the optical module is idle.
  • the compensation control module is configured to:
  • the adjustable light source of the optical module When the absolute value of the frequency deviation value is greater than a threshold and the adjustable light source of the optical module is idle, comparing the frequency deviation value with the threshold, if the frequency deviation value is greater than the threshold, controlling the adjustable light source to decrease Describe the frequency of the local vibration, if the frequency deviation value is less than the threshold, control the Adjusting the light source increases the frequency of the local oscillator.
  • the compensation control module is configured to:
  • the new frequency adjustment value is sent to the adjustable light source.
  • the threshold of the frequency deviation is 2 GHz
  • the upper limit of the adjustment is 3 Ghz
  • the adjustment step value is 200 MHz.
  • the compensation process for this application example includes:
  • Step 601 The first timing time arrives, the controller reads the frequency deviation between the received light and the local oscillator light from the receiving ASIC to be 2.5 GHz;
  • Step 602 Determine that 2.5 GHz is greater than 2 GHz
  • Step 603 determining that the adjustable light source is idle
  • Step 604 Read the current frequency adjustment value from the adjustable light source is 0;
  • Step 605 determining that 2.5 GHz is greater than 2 GHz;
  • Step 606 Subtract the current frequency adjustment value 0 by 200M to obtain a new frequency adjustment value of -200 MHz;
  • Step 607 The absolute value of -200 MHz is less than 3 GHz;
  • Step 608 Set -200 MHz to the adjustable light source and end.
  • Step 609 The second timing time arrives, the controller reads the frequency deviation between the received light and the local oscillator from the ASIC to be 2.3G;
  • Step 610 Determine that 2.3 GHz is greater than 2 GHz
  • Step 611 determining that the adjustable light source is idle
  • Step 612 Read the current frequency adjustment value from the adjustable light source to -200 MHz;
  • Step 613 determining that 2.3 GHz is greater than 2 GHz
  • Step 614 Subtracting the current frequency adjustment value -200 MHz by 200M to obtain a new frequency adjustment value of -400 MHz;
  • Step 615 The absolute value of -400 MHz is less than 3 GHz;
  • Step 616 Set -400 MHz to the adjustable light source, ending.
  • the frequency deviation is reduced from 2.3G to 2.1G.
  • Step 617 The third timing time arrives, the controller reads the frequency deviation value of the received light from the local oscillator from the ASIC to be 2.1 G;
  • Step 618 determining that 2.1 GHz is greater than 2 GHz;
  • Step 619 determining that the adjustable light source is idle
  • Step 620 Read the current frequency adjustment value from the adjustable light source to -400 MHz;
  • Step 621 determining that 2.1 GHz is greater than 2 GHz;
  • Step 622 Subtract the current frequency adjustment value -400MHz by 200M to obtain a new frequency adjustment value -600MHz;
  • Step 623 determining that the absolute value of -600 MHz is less than 3 GHz;
  • Step 624 Set -600 MHz to the adjustable light source and end.
  • the frequency deviation value is already less than the threshold and is within the tolerable range.
  • the threshold of the frequency deviation is 2 GHz
  • the upper limit of the adjustment is 3 Ghz
  • the adjustment step value is 200 MHz.
  • the compensation process for this application example includes:
  • Step 701 The first timing time arrives, the controller reads the frequency deviation between the received light and the local oscillator light from the receiving ASIC as 1.5 GHz;
  • Step 702 Determine that 1.5 GHz is less than 2 GHz, indicating that no compensation is required, and the process ends.
  • the threshold of the frequency deviation is 2 GHz, and the upper limit of the adjustment is 3 GHz.
  • the step size is 200MHz.
  • the compensation process for this application example includes:
  • Step 801 The first timing time arrives, the controller reads the frequency deviation value of the received light from the local oscillator from the receiving ASIC to -3 GHz;
  • Step 802 Determine that the absolute value of -3 GHz is greater than 2 GHz;
  • Step 803 Determine that the adjustable light source is not idle and ends.
  • Step 804 The second timing time arrives, the controller reads the frequency deviation value of the received light from the local oscillator light from the receiving ASIC to -3 GHz;
  • Step 805 Determine that the absolute value of -3 GHz is greater than 2 GHz;
  • Step 806 determining that the adjustable light source is idle
  • Step 807 Read the current frequency adjustment value from the adjustable light source is 0;
  • Step 808 determining that -3 GHz is less than 2 GHz
  • Step 809 Add the current frequency adjustment value 0 to 200M to obtain a new frequency adjustment value of 200 MHz;
  • Step 810 determining that the absolute value of 200 MHz is less than 3 GHz;
  • Step 811 Set 200 MHz to the adjustable light source, and end.
  • the frequency deviation is reduced from -3G to -2.8G, and so on.
  • the frequency deviation is reduced to -2GHz, and the adjustment is over, so I won't go into details here.
  • the threshold of the frequency deviation is 2 GHz
  • the upper limit of the adjustment is 3 GHz
  • the adjustment step value is 200 MHz.
  • the compensation process for this application example includes:
  • Step 901 The first timing time arrives, the controller reads the frequency deviation value of the received light from the local oscillation light from the receiving ASIC to -6 GHz;
  • Step 902 determining that the absolute value of -6 GHz is greater than 2 GHz;
  • Step 903 determining that the adjustable light source is idle
  • Step 904 Read the current frequency adjustment value from the adjustable light source is 0;
  • Step 905 determining that -6 GHz is less than 2 GHz
  • Step 906 Add the current frequency adjustment value 0 to 200M to obtain a new frequency adjustment value of 200 MHz;
  • Step 907 The absolute value of 200 MHz is less than 3 GHz;
  • Step 908 Set 200 MHz to the adjustable light source, and the adjustment ends.
  • the frequency deviation is reduced from -6G to -5.8G, and so on.
  • the frequency deviation is reduced to -3GHz.
  • the current frequency adjustment value is 3GHz, when the next one is reached.
  • Step 909 The controller reads the frequency deviation value of the received light from the local oscillator from the receiving ASIC to -3 GHz;
  • Step 902 Determine that the absolute value of -3 GHz is greater than 2 GHz;
  • Step 903 determining that the adjustable light source is idle
  • Step 904 Read the current frequency adjustment value from the adjustable light source to 3 GHz;
  • Step 906 determining that -3 GHz is less than 2 GHz
  • Step 907 Add the current frequency adjustment value of 3 GHz to 200 M to obtain a new frequency adjustment value of 3.2 GHz;
  • Step 908 3.2 GHz is greater than 3 GHz, stop compensation, and end.
  • the solution of the embodiment of the present invention proposes to compare the frequency offset with the threshold to determine whether to start the adjustment algorithm.
  • the threshold value can ensure that the system service is normal, and the number of adjustments is limited, so that the correct correction is performed, and the downward adjustment is performed.
  • the primary system impact, in addition to the adjustment step size can reduce system instability.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention se rapporte à un procédé et un dispositif de compensation automatique d'une excursion de fréquence, ainsi qu'à un module optique cohérent. Le procédé comprend : la lecture régulière d'une valeur d'excursion de fréquence séparant la lumière reçue et la lumière d'oscillation locale d'un module optique, et, lorsque la valeur absolue de la valeur d'excursion de fréquence est supérieure à une valeur seuil et qu'une source de lumière réglable du module optique est au repos, la commande de la source de lumière réglable pour ajuster la fréquence de la lumière d'oscillation locale de manière à réaliser une compensation d'excursion de fréquence.
PCT/CN2015/076909 2014-10-24 2015-04-17 Procédé et dispositif de compensation automatique d'une excursion de fréquence, et module optique cohérent WO2016062042A1 (fr)

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CN201410577202.2A CN105591702B (zh) 2014-10-24 2014-10-24 一种频率偏差自动补偿的方法、装置以及相干光模块
CN201410577202.2 2014-10-24

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CN102647381A (zh) * 2012-03-22 2012-08-22 中兴通讯股份有限公司 一种mpsk相干光通信系统中频率偏移估计方法及装置
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CN101442364A (zh) * 2007-11-19 2009-05-27 富士通株式会社 光相干接收机、光相干接收机用频差估计装置及方法
CN102439877A (zh) * 2009-06-17 2012-05-02 华为技术有限公司 载波频率恢复方法和光内差相干接收机
CN103534963A (zh) * 2011-05-12 2014-01-22 阿尔卡特朗讯 用于经振幅调制信号的光学接收器

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Publication number Priority date Publication date Assignee Title
CN116405150A (zh) * 2023-06-06 2023-07-07 深圳市迅特通信技术股份有限公司 提高光模块调谐性能的方法、光模块及可读存储介质
CN116405150B (zh) * 2023-06-06 2023-09-12 深圳市迅特通信技术股份有限公司 提高光模块调谐性能的方法、光模块及可读存储介质

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