WO2014100939A1 - Procédé de mesure de caractéristique de fibre optique et module optique - Google Patents

Procédé de mesure de caractéristique de fibre optique et module optique Download PDF

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Publication number
WO2014100939A1
WO2014100939A1 PCT/CN2012/087302 CN2012087302W WO2014100939A1 WO 2014100939 A1 WO2014100939 A1 WO 2014100939A1 CN 2012087302 W CN2012087302 W CN 2012087302W WO 2014100939 A1 WO2014100939 A1 WO 2014100939A1
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WIPO (PCT)
Prior art keywords
wavelength light
signal
wavelength
optical
test
Prior art date
Application number
PCT/CN2012/087302
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English (en)
Chinese (zh)
Inventor
杨素林
殷锦蓉
Original Assignee
华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2012/087302 priority Critical patent/WO2014100939A1/fr
Priority to CN201280002492.7A priority patent/CN103229432B/zh
Publication of WO2014100939A1 publication Critical patent/WO2014100939A1/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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]

Definitions

  • the present invention relates to the field of optical fiber communications, and in particular, to a fiber optic characteristic measuring method and an optical module. Background technique
  • Optical Time Domain Reflectometer is the preferred instrument for measuring fiber characteristics. OTDR can be used to evaluate the characteristics of a single fiber or a complete link. The loss curve and event can be seen at a glance through the OTDR measurement curve. Distance between.
  • the OTDR works in a radar-like mode.
  • the OTDR laser emits a test signal to the fiber under test.
  • the backscattered signal or the fiber link event is formed due to the characteristics of the fiber itself (the medium is not uniform).
  • the connection, the break, and the end of the fiber form a reflected signal.
  • the detector of the OTDR detects the intensity and arrival time of the backscattered signal or the reflected signal, and calculates the line attenuation along the length of the fiber and the event curve on the line.
  • Embodiments of the present invention provide a fiber characteristic measurement method and an optical module.
  • the technical solution is as follows:
  • a method for measuring optical fiber characteristics comprising:
  • the optical time domain reflectometer integrated circuit OTDR ASIC transmits a first wavelength light (1490 nm) carrying the first test signal to the coupler through the laser diode LD, and the coupler transmits the first wavelength light carrying the first test signal Determining, by a fiber coupler, a first designated portion of the first wavelength light carrying the first test signal to the fiber link to be measured, such that the fiber link to be measured is optical to the first wavelength
  • the first designated portion performs reflection or scattering to return the first wavelength light carrying the first backward signal;
  • the coupler reflects the second specified portion of the first wavelength light carrying the first backward signal to the PD Up, the PD is converted into an electrical signal, and then amplified by a transimpedance amplifier TIA, and the OTDR ASIC processes the amplified signal to obtain a first test curve of the fiber link to be measured;
  • the OTDR ASIC transmits a second wavelength light (1310 nm) carrying the second test signal through the LD, and the spectroscope reflects the third designated portion of the second wavelength light such that the designated portion of the second wavelength light passes through the coupler Coupling to the fiber link to be measured, reflecting or scattering the second wavelength light by the fiber link to be measured, and returning to the second wavelength light carrying the second backward signal;
  • the beam splitter transmits a fourth designated portion of the second wavelength light carrying the second backward signal, and the fourth designated portion of the second wavelength light carrying the second backward signal is reflected by the coupler onto the PD Converting the PD into an electrical signal, and then amplifying the transimpedance amplifier TIA, the OTDR ASIC processing the amplified signal to obtain a second test curve of the fiber link to be measured;
  • the optical time domain reflectometer integrated circuit OTDR ASIC transmits the first wavelength light carrying the first test signal to the coupler through the laser diode LD, including:
  • the OTDR ASIC drives the first wavelength LD to transmit a first wavelength light carrying the first test signal to the coupler;
  • the OTDR ASIC sends the first test signal to the LDD, and the first wavelength LD is driven by the LDD to send the first wavelength light carrying the first test signal to the coupler;
  • the OTDR ASIC transmits the second wavelength light carrying the second test signal by using the LD, the method comprising: the OTDR ASIC driving the second wavelength LD to send the second wavelength light carrying the second test signal to the coupler; or
  • the OTDR ASIC sends the second test signal to the LDD, and the LDD drives the second wavelength LD to transmit the second wavelength light carrying the second test signal to the coupler.
  • the first wavelength light carrying the first test signal further carries a downlink data signal
  • the second wavelength light carrying the second test signal further carries a downlink data signal
  • the first designated portion is 10%
  • the second designated portion is 90%
  • the third designated portion is 10%
  • the fourth designated portion is 90%.
  • An optical module comprising: a transimpedance amplifier TIA, a photodetector APD, a limiting amplifier LA, an optical time domain reflectometer integrated circuit OTDR ASIC, a laser driver LDD, a first wavelength LD, a second a wavelength LD, an optical interface, a coupler, wherein the coupler reflects a first specified portion of the first wavelength light, and transmits a portion other than the first designated portion of the first wavelength light to the second wavelength The light is totally reflected.
  • the optical module further includes: a tunable filter disposed on the same optical path as the APD, wherein the tunable filter is configured to filter out the first wavelength light received by the receiving module during a normal communication phase, and transmit the first Two wavelength light, and transmitting the first wavelength light and the second wavelength light in a test phase;
  • the tunable filter is configured to filter the first wavelength light received by the receiving module during a normal communication phase, transmit the second wavelength light, and transmit the first wavelength light during a test phase, and filter the Second wavelength light;
  • the tunable filter is configured to transmit the first wavelength light and the second wavelength light received by the receiving module during a normal communication phase, and transmit the first wavelength light during a test phase, filtering the first Two wavelength light.
  • the TIA is a dual rate transimpedance amplifier, wherein the low speed TIA is used to receive the test signal, and the high speed TIA is used to receive the data signal sent by the opposite end.
  • the first specified part is 10%.
  • the technical solution provided by the embodiment of the present invention has the following beneficial effects: when testing the fiber link to be measured, receiving and transmitting two wavelengths of light carrying the test signal through the detector included in the optical module, so that two wavelengths can be obtained.
  • the test curve of light, and due to the respective characteristics of the two wavelengths of light during transmission, enhances the ability to identify bending events on the link and improves measurement accuracy.
  • FIG. 1 is a schematic structural view of a PON system
  • FIG. 2 is a schematic structural view of a light module in the prior art
  • FIG. 3 is a schematic structural view of a BOSA in a single-fiber bidirectional optical module in the prior art
  • FIG. 4 is a flowchart of a method for measuring optical fiber characteristics according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an optical module according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of an optical module according to an embodiment of the present invention. detailed description
  • FIG. 1 is a schematic diagram of the structure of a PON system.
  • a passive optical network system includes an OLT (Optical Line Terminal) at the central office, and an ODN (Optical Distribution Network) for branching/coupling or multiplexing/demultiplexing. ) and a number of ONUs (Optical Network Units).
  • the OLT provides a network side interface for the PON system, connecting one or more 0DNs.
  • the ODN is a passive optical splitting device that transmits the downlink data of the 0LT to each 0NU, and simultaneously transmits the uplink data of multiple 0NUs to the OLT.
  • the ONU provides a user-side interface for the PON system, and the upstream is connected to the ODN.
  • ODN is generally divided into three parts, Splitter (passive optical splitter), backbone fiber (Feed Fiber), distributed fiber (Distribute Fiber) and split fiber (Drop Fiber), where distributed fiber and split fiber can be collectively referred to as branch optical fiber.
  • the OLT to the ONU is called downlink, and vice versa.
  • the uplink uses 1310nm wavelength light
  • the downlink uses 1490nm wavelength light.
  • the downlink data is broadcast to each ONU because of the characteristics of the optical.
  • the uplink data transmission of each ONU is allocated by the OLT.
  • FIG. 2 is a schematic structural diagram of an optical module in the prior art in a single-fiber bidirectional system (a single optical fiber transmits a bidirectional data signal).
  • the optical module is mainly composed of a BOSA (Bidirectoinal Optical Subassebly) light. Component, LA (limiting Amplifier) and LDD (laser diode driver).
  • the transmitted data signal is input to the single-fiber bidirectional optical module by the TX port, and is output to the LD (Laser Diode) through the LDD, and the optical signal is converted by the LD to convert the data signal into an optical signal with a wavelength of ⁇ 1 .
  • the WDM (Wavelength Division Multiplexing) device in the figure transmits light signals of wavelength ⁇ 1 and reflects light signals of wavelength ⁇ 2 .
  • the transmitted ⁇ ⁇ light signal passes through the WDM into the fiber optic adapter and is coupled via the fiber optic adapter Combined with fiber.
  • the optical signal ⁇ 2 sent by the opposite end after reaching the WDM through the fiber adapter, is reflected by the WDM, enters the receiving optical component, is converted into an electrical signal by the detector PD (Photo-diode), and is placed by the TIA (Transimpedance)
  • the electrical signal output by the TIA continues to be amplified by LA (Limiting Amplifier), converted to a 0, 1 digital level signal, and output from the Rx port.
  • the structure of the BOSA in the single-fiber bidirectional optical module is shown in Figure 3.
  • the optical transceiver assembly BOSA 200 can include a base 10, a WDM 20, a transmitting module 30, a receiving module 40, and a fiber optic adapter 50.
  • the base 10 includes a cavity and three ports, and the three ports may be a first horizontal port, a second horizontal port, and a vertical port, respectively, and the cavity is in communication with the first horizontal port, the second horizontal port, and the vertical port.
  • the center of the vertical port is disposed along the vertical optical axis of the optical transceiver assembly 200.
  • the wavelength division multiplexer 20 can be a WDM filter that is generally disposed within the cavity of the base 10 in a direction of about 45 degrees along the horizontal optical axis, and the center of the wavelength division multiplexer 20 is located at the intersection of the horizontal optical axis and the vertical optical axis. point.
  • a support body 60 may be disposed inside the cavity of the base 10, and the support body 60 has a 45 degree slope.
  • the wavelength division multiplexer 20 can be placed at a 45 degree slope of the support so as to maintain an angle of 45 degrees with the horizontal optical axis.
  • the wavelength division multiplexer 20 transmits the first wavelength ⁇ , and reflects the second wavelength ⁇ 2 .
  • the receiving module 40 generally includes a photodetector (PD) and a transimpedance amplifier (TIA), and the PD can be a PIN photodetector or an APD photodetector.
  • the transmitting module 30 is generally packaged with a laser LD, and the receiving module 40 and the transmitting module 30 are generally T0-CAN packages.
  • the optical module based on the embodiment of the present invention supports two working modes, a normal data communication mode and a test mode.
  • the normal data communication mode the OTDR ASIC is in a standby or low power mode.
  • the data packet sent by the 0LT device to the peer end is sent to the 0LT optical module through the TX, and the first wavelength LD is converted into a 1490 nm optical signal by the LDD in the optical module, and coupled to the optical fiber link to be measured, that is, the 0DN through the coupler and the fiber coupler.
  • the network is passed to 0NT.
  • FIG. 4 is a flowchart of a method for measuring optical fiber characteristics according to an embodiment of the present invention. The measurement method is applied to the test mode of the optical module at the 0LT end. Referring to FIG. 4, the embodiment includes:
  • the optical time domain reflectometer integrated circuit 0TDR ASIC sends the first wavelength light carrying the first test signal to the coupler through the laser diode LD, and the coupler transmits the first light of the first wavelength light carrying the first test signal. a portion of the first wave carrying the first test signal by a fiber coupler The first designated portion of the long light is coupled to the fiber link to be measured, such that the fiber link to be measured reflects or scatters the first specified portion of the first wavelength light, and returns to the first of the first backward signal Wavelength light
  • the first wavelength light may be 1490 nm light
  • the first specified portion of the first wavelength optical signal carrying the first test signal in the example of y%, is transmitted by the coupler and then coupled via the fiber coupler On the fiber link to be measured, that is, the ODN connected to the OLT and the ONT.
  • the first wavelength test and the second wavelength test are divided.
  • the first wavelength (1490 nm) test can be triggered by the OLT to notify the OTDR ASIC to trigger.
  • the OLT device first stops the data transmission of the opposite end ONT, and then the OLT notifies the OTDR ASIC (signal processing function) to start the test, and the notification may be
  • the test is initiated by issuing an command through the I2C interface of the optical module or by controlling the OTDR ASIC through the control signal line;
  • the optical time domain reflectometer integrated circuit OTDR ASIC transmits the first wavelength light carrying the first test signal to the coupler through the first wavelength LD.
  • the coupler reflects the second designated portion of the first wavelength light carrying the first backward signal onto the PD, converts the PD into an electrical signal, and performs amplification by a transimpedance amplifier TIA, the OTDR ASIC Processing the amplified signal to obtain a first test curve of the fiber link to be measured; specifically, the first wavelength light (1490 nm) carrying the first backward signal is passed through the fiber coupler of the fiber link to be measured Coupled to the optical module Triplex, through the splitter, when reaching the coupler, the second designated portion of the first wavelength light is reflected to the PD, converted into an electrical signal by the PD, and amplified by the TIA.
  • the OTDR ASIC processes the amplified signal, and the processing includes amplification, sampling, digital processing, etc., to obtain a first test curve of the fiber link to be measured.
  • the OTDR ASIC sends a second wavelength light (131 Onm) carrying the second test signal through the LD, and the optical splitter reflects the third designated portion of the second wavelength light, so that the designated portion of the second wavelength light is Coupling to the fiber link to be measured by the coupler, reflecting or scattering the second wavelength light by the fiber link to be measured, and returning the second wavelength light carrying the second backward signal;
  • the transmitted test signal will pass through the splitter (for the second wavelength of light, X2% reflection, Y2% transmission, preferably 10% reflection, 90% transmission), and the second test signal will be reflected by the beam splitter and then enter the fiber coupler. , then coupled into the fiber through a fiber coupler.
  • the second wavelength test (1320 nm) may be triggered by the OLT to notify the OTDR ASIC to trigger. Specifically, the OLT device first stops the data transmission of the opposite end ONT, and then the OLT notifies the OTDR ASIC (signal processing function) to start the test, and the notification may specifically In order to pass the I2C interface of the optical module To enable or control the OTDR ASIC to initiate a test via a control signal line;
  • the optical time domain reflectometer integrated circuit OTDR ASIC transmits the second wavelength light carrying the second test signal to the coupler through the second wavelength LD.
  • the optical splitter transmits a fourth designated portion of the second wavelength light carrying the second backward signal, and the fourth designated portion of the second wavelength light carrying the second backward signal is reflected by the coupler to
  • the PD is converted into an electrical signal, and then amplified by a transimpedance amplifier TIA, and the OTDR ASIC processes the amplified signal to obtain a second test curve of the fiber link to be measured; specifically, The second wavelength light (1310 nm) will be backscattered or reflected in the fiber link to be measured, and the second wavelength light carrying the second backward signal will be coupled to the optical module Triplex by the fiber link to be measured via the fiber coupler.
  • the beam splitter Passing through the beam splitter, the beam splitter transmits a fourth designated portion of the second wavelength light carrying the second backward signal, and is reflected by the coupler when the fourth designated portion of the second wavelength light carrying the second backward signal reaches the coupler To the PD, it is converted into an electrical signal by the PD, and then amplified by the TIA.
  • the OTDR ASIC processes the amplified signal, which includes amplification, sampling, digital processing, etc., to obtain a second test curve of the fiber link to be measured.
  • the step 405 specifically includes:
  • the first test curve is more likely to reflect the bending event on the fiber link; the second wavelength (1310 nm) is more likely to form a reflection at the position of the opposite end ONT (ONT pair)
  • the 1310nm test signal reflects more.
  • the second test curve more easily reflects the position information of the ONT on the fiber link.
  • the attenuation of the bending event at a certain point in the first test curve is greater than the first preset value
  • the The attenuation of the bending event at the point of the first test curve as the bending characteristic of the point in the characteristic curve of the fiber link to be measured
  • the relative height of the reflection peak at a certain point in the second test curve relative noise
  • the reflection peak of the point in the second test curve is taken as the emission characteristic of the point in the characteristic curve of the fiber link to be measured.
  • the attenuation of the bending event at a certain point (point A, for example, 2 Km) on the first test curve is greater than a certain value (for example, Greater than 0.2dB), even if the attenuation on the second curve at point A (same position on the first test curve) does not appear, the attenuation of A on the first test curve is taken as the characteristic curve of the fiber link to be measured.
  • the characteristic of the upper A when there is a reflection on the second test curve near the position B of the ONT, as long as the relative height of the reflection (relative noise area or relative attenuation curve) is greater than a certain value (for example, large At 3dB), even if point B on the first test curve has no reflection peak, the reflection peak of B on the second test curve is taken as the characteristic of B on the characteristic curve of the fiber link to be measured.
  • a certain value for example, large At 3dB
  • the present invention enhances the built-in OTDR function by using the same PD to complete the reception and transmission of the dual-wavelength light carrying the test signal in the optical module based on the three-directional optical component, and provides the built-in OTDR function.
  • the two wavelengths of light carrying the test signal are received and transmitted by the detector included in the optical module, so that the test curve of the two wavelengths of light can be obtained, and the two wavelengths are transmitted.
  • the individual characteristics of the process enhance the ability to identify bending events on the link and improve measurement accuracy.
  • the step 401 "the optical time domain reflectometer integrated circuit OTDR ASIC sends the first wavelength light carrying the first test signal to the coupler through the laser diode LD" , including the following steps 4011 or 4012:
  • the OTDR ASIC drives a first wavelength LD to send a first wavelength light carrying a first test signal to a coupler.
  • the OTDR ASIC sends the first test signal to the LDD, and the first wavelength LD is driven by the LDD to send the first wavelength light carrying the first test signal to the coupler.
  • the step 403 "the OTDR ASIC sends the second wavelength light carrying the second test signal through the LD", including the following steps 4031 and 4032:
  • the OTDR ASIC drives the second wavelength LD to send the second wavelength light carrying the second test signal to the coupler;
  • the OTDR ASIC sends the second test signal to the LDD, and the second wavelength LD is driven by the LDD to send the second wavelength light carrying the second test signal to the coupler.
  • the first wavelength light carrying the first test signal further carries a downlink data signal, and/or the second carrying the second test signal, on the basis of the technical solution of the embodiment shown in FIG.
  • the wavelength light also carries a downlink data signal.
  • the first test signal can be in two forms. The first one is: stopping downlink data transmission, and carrying only the first test signal in the first wavelength light.
  • the second mode is: the downlink data transmission is not stopped, the first test signal and the downlink data signal are simultaneously carried in the first wavelength light, and the first test signal is modulated onto the downlink data signal by amplitude modulation to be transmitted.
  • the second test signal can also be in two forms. The first one is: stopping the downlink data transmission, and carrying only the second test signal in the second wavelength light.
  • the second mode is: the downlink data transmission is not stopped, the second test signal and the downlink data signal are simultaneously carried in the second wavelength light, and the second test signal is modulated onto the downlink data signal by amplitude modulation to be transmitted.
  • stopping the downlink data transmission may turn off the driving of the data part on the LDD, or the OLT device may stop the TX transmission.
  • the dual-rate TIA is used to replace the TIA of the first optical wavelength for receiving the data packet in the existing optical module, where the low-speed TIA is used to receive the test signal; and the high-speed TIA is used to receive the data signal sent by the opposite end. .
  • Triplex selects the low-speed TIA under the control signal control, receives the test signal as described above, and sends the test signal to the OTDR ASIC.
  • BOSA's dual rate control signals can be provided by the OTDR ASIC or by other functions within the optical module, or even directly by the OLT device via the hardware interface.
  • the OTDR ASIC output signal selects the high speed TIA in data receive mode and the low speed TIA in the test mode.
  • the optical module Under data reception modulus, the optical module provides a control signal to the Triplex TIA to select the high speed TIA. The signal transmitted by the opposite end is received in the aforementioned data receiving process.
  • FIG. 5 is a schematic structural diagram of an optical module according to an embodiment of the present invention. Referring to FIG.
  • the optical module includes: a transimpedance amplifier TIA, a photodetector APD, a limiting amplifier LA, an optical time domain reflectometer integrated circuit OTDR ASIC, a laser driver LDD, a first wavelength LD, a second wavelength LD, an optical interface. And a coupler, wherein the coupler reflects a first designated portion of the first wavelength light (1490), and transmits a portion other than the first designated portion of the first wavelength light, The two-wavelength light (1310) is totally reflected.
  • an optical module provided by the embodiment of the present invention has a specific structure as shown in FIG. 6. On the basis of the embodiment shown in FIG. 5, the optical module further includes: the same optical path as the APD. Adjustable filter.
  • the tunable filter is configured to filter out the first wavelength light received by the receiving module during a normal communication phase, transmit the second wavelength light, and transmit the first wavelength light and the second wavelength during a test phase Light;
  • the tunable filter is configured to filter the first wavelength light received by the receiving module during a normal communication phase, transmit the second wavelength light, and transmit the first wavelength light during a test phase, and filter the Second wavelength light;
  • the tunable filter is configured to transmit the first wavelength light and the second wavelength light received by the receiving module during a normal communication phase, and transmit the first wavelength light during a test phase, filtering the first Two wavelength light.
  • the 1490nm optical signal sent by the OLT to the opposite end will also generate backscattered or reflected signals in the optical fiber. These signals will be returned to the OLT optical module, through the fiber coupler, to the coupler, and the 1490m data signal. A part of the backward signal is reflected by the coupler to the PD, and the partially reflected 1490 nm optical signal is superimposed with the 1310 nm data signal sent from the opposite end and received by the PD. For data reception, this part of the 1490nm backward light is equivalent to the noise signal, which affects the performance of data reception.
  • the opposite end ONT sends a 1310nm optical signal, this part of the signal reaches the PD and is much stronger than the 1490nm test signal.
  • the opposite end ONT sends a 1310nm optical signal, which is equivalent to Noise signal.
  • the 1310nm optical signal transmitted by the opposite end is filtered out during the test, and the data receiving performance and OTDR test performance are improved, and the receiving module can be received before the receiver of the Triplex ( Adding a tunable filter in PD+TIA), after adding a tunable filter, it is necessary to increase the control of the tunable filtering with respect to the aforementioned data receiving mode and test mode.
  • the control tunable filter filters out the 1490 nm optical signal and passes the 1310 nm optical signal.
  • the tunable filter is filtered to filter out the 1310 nm optical signal and pass the 1490 nm optical signal.
  • This control can be issued by the OLT.
  • the TIA is a dual-rate transimpedance amplifier, wherein the low-speed TIA is used to receive the test signal, and the high-speed TIA is used to receive the data signal sent by the opposite end.
  • Triplex selects the low-speed TIA under control signal control, receives the test signal as described above, and sends the test signal to the OTDR ASIC.
  • BOSA's dual-rate control signals can be provided by the OTDR ASIC or by other functions within the optical module, or even directly by the OLT device through the hardware interface.
  • the OTDR ASIC output signal selects the high speed TIA in data receive mode and the low speed TIA on the OTDR ASIC output signal in test mode.
  • the optical module Under data reception modulus, the optical module provides control signals to Triplex's TIA to select high speed TIA. The signal sent by the opposite end is received in the aforementioned data receiving process.
  • the first specified part is 10%.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un procédé de mesure de caractéristique de fibre optique, ainsi qu'un module optique. Le module optique comprend un amplificateur trans-impédance (TIA), un photodétecteur (APD), un amplificateur limiteur (LA), un circuit intégré de réflectomètre optique dans le domaine temporel (OTDR ASIC), un circuit de commande (LDD) de diode laser, une diode laser (LD) à première longueur d'onde, une LD à seconde longueur d'onde, une interface optique et un coupleur. Le coupleur reflète une première partie spécifiée de lumière d'une première longueur d'onde, transmet le reste de la lumière de la première longueur d'onde, à l'exception de la première partie spécifiée, puis réalise une réflexion totale de la lumière d'une seconde longueur d'onde. Le détecteur dans le module optique reçoit puis envoie la lumière de deux longueurs d'onde qui transporte des signaux de test, de manière à obtenir des courbes de test de la lumière de deux longueurs d'onde. En raison des caractéristiques de la lumière des deux longueurs d'onde dans le processus de transmission, la capacité d'identification d'un événement de flexion sur une liaison est améliorée et la précision de mesure est renforcée.
PCT/CN2012/087302 2012-12-24 2012-12-24 Procédé de mesure de caractéristique de fibre optique et module optique WO2014100939A1 (fr)

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PCT/CN2012/087302 WO2014100939A1 (fr) 2012-12-24 2012-12-24 Procédé de mesure de caractéristique de fibre optique et module optique
CN201280002492.7A CN103229432B (zh) 2012-12-24 2012-12-24 光纤特性测量方法和光模块

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PCT/CN2012/087302 WO2014100939A1 (fr) 2012-12-24 2012-12-24 Procédé de mesure de caractéristique de fibre optique et module optique

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