CN102742184A - Optical fiber link detection method, optical line terminal and passive optical network system - Google Patents
Optical fiber link detection method, optical line terminal and passive optical network system Download PDFInfo
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- CN102742184A CN102742184A CN2011800028980A CN201180002898A CN102742184A CN 102742184 A CN102742184 A CN 102742184A CN 2011800028980 A CN2011800028980 A CN 2011800028980A CN 201180002898 A CN201180002898 A CN 201180002898A CN 102742184 A CN102742184 A CN 102742184A
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- 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]
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- H—ELECTRICITY
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Abstract
An embodiment of the invention relates to an optical fiber link detection method, an optical line terminal and a passive optical network system. The optical line terminal comprises at least one transceiver and a detection apparatus, wherein the transceiver is used for sending a first test optical signal to a data channel to be detected, wherein the data channel to be detected is any data channel between the optical line terminal and an optical network unit; the detection apparatus is used for receiving a second test optical signal returned after the first test optical signal is transmitted by the data channel to be detected, and obtaining a test curve of the data channel to be detected according to the second test optical signal. The embodiment of the invention facilitates detection and fault location of the optical fiber link.
Description
Technical field
The embodiment of the invention relates to communication technical field, particularly a kind of optical fiber link detection method, optical line terminal and passive optical network.
Background technology
At present, Optical Access Network has become the strong competitor of broadband access network of future generation, and is wherein especially more competitive with EPON.Usually; EPON (Passive Optical Network; PON) system comprise an optical line terminal that is positioned at the central office (Optical Line Terminal, OLT), an optical distribution network (Optical Distribution Network who is used for branch/coupling or multiplex/demultiplex; ODN) and some optical network units (Optical Network Unit, ONU).
At fiber optic communication field, (Optical Time Domain Reflectrometer OTDR) is a kind of very important tester to optical time domain reflectometer.OTDR is through emissioning testing signal in testing fiber, and retroreflection in the measuring optical fiber and scattered signal are known the state information of testing fiber circuit, thereby judges that case point is analyzed and fault location on the testing fiber.
Existing OTDR equipment volume is big, and complicated operation requires than higher operators'skills, when using OTDR that optical fiber link is tested, need on the test interface of reserving on the fiber optic network, insert OTDR, makes the failure detection operations process complicated.
Summary of the invention
The embodiment of the invention provides a kind of optical fiber link detection method, optical line terminal and passive optical network, so that optical fiber link is detected and fault location.
On the one hand, the embodiment of the invention provides a kind of optical line terminal, comprising: at least one transceiver and checkout gear;
Said transceiver is used for sending the first test light signal to the testing data passage, and wherein, said testing data passage is any circuit-switched data passage between said optical line terminal and the optical network unit;
Said checkout gear is used to receive the second test light signal that the said first test light signal returns after through said testing data channel transfer, and according to the said second test light signal, obtains the test curve of said testing data passage.
On the other hand, the embodiment of the invention also provides a kind of passive optical network, comprising: optical line terminal, Optical Distribution Network and at least one optical network unit;
Said optical line terminal comprises: at least one transceiver and checkout gear;
Said transceiver is used for sending the first test light signal to the testing data passage; Wherein, said testing data passage is any circuit-switched data passage between said optical line terminal and the optical network unit;
Said checkout gear is used to receive the second test light signal that the said first test light signal returns after through said testing data channel transfer, and according to the said second test light signal, obtains the test curve of said testing data passage.
On the one hand, the embodiment of the invention also provides a kind of optical fiber link detection method, comprising again:
Optical line terminal sends the first test light signal to the testing data passage, and wherein, said testing data passage is any circuit-switched data passage between said optical line terminal and the optical network unit;
Said optical line terminal receives the second test light signal that the said first test light signal returns after through said testing data channel transfer;
Said optical line terminal obtains the test curve of said testing data passage according to the said second test light signal.
Optical fiber link detection method, optical line terminal and passive optical network that the embodiment of the invention provides; Send the first test light signal that is used for the detection fiber link through the transceiver in the optical line terminal; And in optical line terminal, be provided for receiving the second test light signal that the first test light signal returns after through the testing data channel transfer and draw the checkout gear of testing result to the second test light signal, thereby be convenient to the detection and the fault location of optical fiber link more according to the back.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of an embodiment of optical line terminal provided by the invention;
Fig. 2 is the structural representation of another embodiment of optical line terminal provided by the invention;
Fig. 3 is the structural representation of an embodiment of passive optical network provided by the invention;
Fig. 4 is the structural representation of another embodiment of passive optical network provided by the invention;
Fig. 5 is the structural representation of another embodiment of passive optical network provided by the invention;
Fig. 6 is the flow chart of an embodiment of optical fiber link detection method provided by the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Fig. 1 is the structural representation of an embodiment of optical line terminal provided by the invention, and is as shown in Figure 1, and this optical line terminal comprises: at least one transceiver 1 and checkout gear 2;
The optical line terminal OLT that the embodiment of the invention provides; Be applicable to asynchronous transfer mode EPON (Asynchronous Transfer Mode PON; ATM-PON), the EPON based on Ethernet (Ethernet), Wave division multiplexing passive optical network (Wave Division Multiplexing, polytype EPON such as WDM-PON).
The OLT that present embodiment provides can comprise at least one transceiver 1, and transceiver 1 can be used for sending downstream signal to ONU, and receives the upward signal that ONU sends.Further, the OLT that present embodiment provides, also integrated being used for detected the OTDR function with fault location to the optical fiber link between OLT and the ONU on it.
Need to prove, owing to have at least one transceiver 1 among the OLT, in the optical fiber link between OLT and the ONU (physical link); Can regard as and have multichannel data passage (logical links); Therefore, each transceiver 1 can be corresponding with an ONU, and each transceiver 1 can be corresponding with a circuit-switched data passage; Therefore; The first test light signal that each transceiver 1 sends can be used to detect the circuit-switched data passage between this transceiver 1 and the ONU, perhaps, is used for the fault of the data channel between this transceiver 1 and the ONU is positioned.At least one transceiver 1 among the OLT can shared checkout gear 2; Be that checkout gear 2 can receive the second test light signal that arbitrary transceiver 1 sends among the OLT the first test light signal returns, and then the data channel between arbitrary transceiver 1 and the ONU is detected and fault location.
Wherein, when the optical fiber link of the first test light signal between OLT to ONU transmits, scattering possibly take place (for example: Rayleigh scattering), and (for example: Rayleigh scattering signal) produce scattered signal; Also possibly run into barrier point and (for example: Fresnel reflection), and produce reflected signal reflect.Therefore, the second test light signal that returns after through the testing data channel transfer of the first test light signal can comprise scattered signal and/or reflected signal.This second test light signal can return OLT along the optical fiber link of OLT to ONU; Checkout gear 2 can be used to receive the second test light signal; And can further obtain the testing result of the optical fiber link of OLT to ONU according to the second test light signal, testing result can adopt test curve to represent usually.Wherein, checkout gear 2 can comprise photodetector, pre-amplifier or parts such as trans-impedance amplifier, analog to digital converter.Checkout gear can adopt existing the whole bag of tricks, obtains the test curve of the optical fiber link of OLT to ONU to light signal according to the back.
Each transceiver 1 can periodically detect the data channel between transceiver 1 and the ONU, that is, transceiver 1 can periodically send the first test light signal; Perhaps, each transceiver 1 also can send the first test light signal and carries out data channel and detect when receiving local control command of OLT or Long-distance Control; Perhaps, transceiver 1 can also and ONU between data channel on up luminous power send the first test light signal when situation such as unusual occurring, so that the data channel between transceiver 1 and the ONU is carried out fault location.The trigger condition that transceiver 1 sends the first test light signal can be provided with as required, does not enumerate one by one at this.
Have at OLT under the situation of a plurality of transceivers 1, when arbitrary transceiver 1 sends the first test light signal, as a kind of enforcement scene of present embodiment; The transceiver 1 that sends the first test light signal can normally carry out the transmission of downstream signal, perhaps, can stop the transmission of downstream signal; Perhaps; Can also the first test light signal be modulated at above the downlink data, that is, adopt the first test light signal that downlink data is carried out amplitude modulation(PAM).Other transceivers 1 for except that the transceiver 1 that sends the first test light signal can normally send downstream signal.But the backward signal and the second test light signal of the downstream signal that sends for fear of other transceivers together get into checkout gear 2; Thereby influence testing result; Another kind as present embodiment is implemented scene; Other transceivers 1 except that the transceiver 1 that sends the first test light signal can stop the transmission of downstream signal.
The optical line terminal that present embodiment provides; Send the first test light signal that is used for the detection fiber link through the transceiver among the OLT; And in OLT, be provided for receiving the second test light signal that the first test light signal returns after through the testing data channel transfer and draw fault detect result's checkout gear according to the second test light signal; Thereby the OTDR function that will detect is integrated into the OLT end; When the optical fiber link between OLT and ONU broke down, the transceiver that can directly start on the OLT sent the first test light signal, and adopted the checkout gear that is integrated on the OLT to receive the test curve that the second test light signal draws link between transceiver and the ONU; Thereby can further can calculate the fault detect result, thereby be convenient to the detection and the fault location of optical fiber link more according to test curve.In addition; Send the first test light signal through the transceiver among the OLT; And in OLT, be provided for receiving the checkout gear that the second test light signal draws the link detecting result; Thereby the OTDR function that will carry out link detecting is integrated into the OLT end, on OLT, can pass through local command line or Long-distance Control or periodic triggers mode, and the transceiver that starts on the OLT sends the first test light signal; And adopt the checkout gear that is integrated on the OLT to receive the test curve that the second test light signal draws link between transceiver and the ONU, thereby can further can calculate or judge optical fiber link state or variation tendency according to test curve.
Fig. 2 is the structural representation of another embodiment of optical line terminal provided by the invention, and is as shown in Figure 2, and this optical line terminal OLT comprises: at least one transceiver 1 and checkout gear 2;
The transceiver 1 that the embodiment of the invention provides can be the structure that integrates of transmitter and receiver; Perhaps, can also cooperate the function that realizes transceiver 1 jointly by a plurality of functional units.Present embodiment provides a kind of feasible configurations of transceiver 1, and transceiver 1 can comprise: and first receiver 11 and reflective semiconductor amplifier 12 (Reflective Semiconductor Optical Amplifier, RSOA); Wherein:
First receiver 11 can be used to receive the upward signal that ONU sends;
RSOA12 can be used for sending the first test light signal to ONU.
Optional, among the OLT, perhaps in the transceiver 1 wavelength division multiplexer WDM13 can also be set further, through this WDM13 the upward signal that the ONU that receives sends is sent to said first receiver 11, and is used for the downstream signal that RSOA12 sends is sent to ONU.
Under a kind of enforcement scene, each transceiver 1 that the embodiment of the invention provides (specifically can be the RSOA12 in the transceiver 1) can periodically send the first test light signal with the data channel between detection and the ONU.
Implement under the scene at another kind, send the first test light signal under the triggering of the test control command that the remote equipment that transceiver 1 (specifically can be the RSOA12 in the transceiver 1) can also perhaps be connected with OLT in the test control command that send OLT this locality sends.Perhaps; OLT can also be provided with certain test trigger condition in advance; Specifically can be; For example: whether satisfy certain test period, whether the upward signal power that receives on the data channel between perhaps a certain transceiver 1 and the ONU is unusual, and catastrophe failure etc. appears in the data channel between perhaps a certain transceiver 1 and the ONU.When satisfying the test trigger condition, then OLT can send test instruction to the corresponding transceiver 11 (specifically can be the RSOA12 in the transceiver 1) of testing data passage, starts the corresponding transceiver of testing data passage and sends the first test light signal.
The checkout gear 2 that the embodiment of the invention provides can be for integrating structure; Perhaps, can also cooperate the function that realizes checkout gear 2 jointly by a plurality of functional units.Present embodiment provides a kind of feasible configurations of checkout gear 2, and checkout gear can comprise: second receiver 21, processor 22 and controller 23; Wherein:
Under a kind of enforcement scene, checkout gear 2 (specifically can be second receiver 21) can cooperate with each transceiver 1, periodically receives transceiver 1 and sends the second test light signal, and draw corresponding test curve through processor 22.
Implement under the scene at another kind; Start the reception second test light signal under the triggering of the reception control command that the remote equipment that checkout gear 2 (specifically can be second receiver 21) also can perhaps be connected with OLT in the reception control command that send OLT this locality sends, and draw corresponding test curve through processor 22.Perhaps, checkout gear 2 (specifically can be second receiver 21) can also trigger after satisfying the test trigger condition and receive the second test light signal.
Can under the triggering of the local perhaps remote equipment of OLT, send the first test light signal based on above-mentioned transceiver 1; And checkout gear 2 can receive the execution mode of the second test light signal under the triggering of the local perhaps remote equipment of OLT; Among the OLT that the embodiment of the invention provides; On the checkout gear 2 among OLT or the OLT controller 23 can be set further, wherein:
Wherein, controller 23 can be for being integrated in the control unit in the checkout gear 2, also can go up the Control Software that loads or OLT through OLT and go up the medium access control that is provided with (Media Access Control, MAC) chip is realized its controlled function.
The OLT that the embodiment of the invention provides; Need detect the circuit-switched data passage between optical line terminal and the ONU or during fault location; The corresponding transceiver 1 of this data channel to be detected need send the first test light signal; All transceivers 1 among the OLT comprise that promptly needs send the transceiver 1 of the first test light signal, can stop the transmission of downstream signal; Perhaps, other transceivers except that the corresponding transceiver 1 of data channel to be detected can stop the transmission of downstream signal.
As a kind of possible implementation, the above-mentioned operation that stops transceiver 1 transmission downstream signal can be triggered by controller 23.Specifically can be; Controller 23 can send halt instruction to testing data passage corresponding transceiver 1 and other transceivers 1; Perhaps; Can also send halt instruction by other transceivers 1 outside the corresponding transceiver 1 of testing data passage,, indicate transceiver 1 to stop to send downstream signal through this halt instruction.
The OLT that the embodiment of the invention provides; Need detect the circuit-switched data passage between optical line terminal and the ONU or during fault location; The corresponding transceiver 1 of this data channel to be detected need send the first test light signal; In order not influence the downstream signal transmission of other transceivers except that the transceiver that need send the first test light signal 1, and the backward signal that reduces the downstream signal that other transceivers 1 send gets into the influence of 2 pairs of testing results of checkout gear, further; The OLT that the embodiment of the invention provides; Can further include: tunable filter 24, this tunable filter 24 can be arranged on OLT inside, also can be arranged on checkout gear 2 inside among the OLT.Wherein:
This tunable filter 24 can be used for other light signals outside the filtering second test light signal, so that the second test light signal gets into checkout gear 2.
Under a kind of enforcement scene of present embodiment; The free transmission range of tunable filter 24 (also can become passband width) can cover the bandwidth chahnel of the arbitrary data channel between OLT and the ONU; Promptly; Can realize that tunable filter 24 allows the light signal of the bands window wavelength of the arbitrary data channel between OLT and the ONU to pass through the light signal of the bands window wavelength of other data channel of filtering through free transmission range setting to tunable filter 24.For example: each data channel is spaced apart 0.4nm, and bands window width (being bandwidth chahnel) also is 0.4nm, supposes that three adjacent data passages are respectively i-1, i and i+1; The bands window wave-length coverage is respectively: [x-1.0nm, x-0.6nm], [x-0.2nm, x+0.2nm] and [x+0.6nm; X+1.0nm]; When adjustable filtering 24 is adjusted to and matees with data channel i (bandwidth chahnel of the free transmission range cover data passage i of tunable filter 24), that is, and when only allowing the light signal of the bands window wavelength of data channel i to pass through; Then have only the interior wavelength of [x-0.2nm, x+0.2nm] window could pass through tunable filter 24 and arrive checkout gear 2.In this case, the passband width of tunable filter 24 can be narrower than the passband width of each data channel, and for example: the passband width of data channel is 0.4nm, and then the passband width of tunable filter 24 can be set to 0.3nm; Perhaps; The passband width of tunable filter 24 also can be wideer than the passband width of each data channel, and for example: the passband width of data channel is 0.4nm, and then the passband width of tunable filter 24 can be set to 0.5nm; Even the centre wavelength of the passband of tunable filter 24 can be in full accord with the centre wavelength of data channel; For example: the centre wavelength of data channel i is xnm, and tunable filter 24 is during with data channel i coupling, and centre wavelength can be x+0.1nm.
Another kind at present embodiment is implemented under the scene, and the free transmission range of tunable filter 24 can cover the bandwidth chahnel of an above data channel between OLT and the ONU, that is, tunable filter 24 also can be to divide into groups to regulate.For example: tunable filter 24 can cover the bandwidth chahnel of 2 or a few data channel, and for example: when the passband of each data channel is 0.4nm, be spaced apart 0.4nm, then the passband width of tunable filter 24 can be 1.6nm.When data passage i is tested; Then can be transferred to the centre wavelength of tunable filter 24 in the passband of data channel i; The backward signal of the 1 adjacent data passages of data channel i also can pass through tunable filter 24 and device to be detected 2 receptions, in this case, owing to have only the backward signal of the downstream signal of a few adjacent data passage can influence the testing result of testing data passage; Therefore, also can improve the accuracy of testing result to a certain extent.
As a kind of possible implementation; Can control by 23 pairs of tunable filters 23 of controller; Specifically can be: after controller 23 receives the test control command or satisfies the test trigger condition; Can send regulating command to tunable filter 24; Be set to cover the bandwidth chahnel of testing data passage to control tunable filter 24 free transmission ranges, thus the second test light signal that returns after the first test light signal that the corresponding transceiver of testing data passage 1 is sent transmits through data channel, can device to be detected 2 receptions through tunable filter 24.
Technical at the foregoing description; After checkout gear 2 draws testing result; Checkout gear 2 can be uploaded test curve according to the control command of uploading of other equipment under the triggering of other equipment that are connected with OLT, perhaps according to showing that control command shows test curve.
More than several embodiment several kinds of feasible configurations of the OLT of integrated checkout gear function are provided; The OLT that provides based on the embodiment of the invention; The embodiment of the invention also further provides a kind of passive optical network; As shown in Figure 3, this passive optical network can comprise: optical line terminal 31, Optical Distribution Network 32 and at least one optical network unit 33; Wherein:
Transceiver can be used for sending the first test light signal to the testing data passage, and wherein, the testing data passage is any circuit-switched data passage between optical line terminal and the optical network unit;
Checkout gear can be used to receive the second test light signal that the first test light signal returns after through the testing data channel transfer, and according to the second test light signal, obtain the test curve of testing data passage.
The passive optical network that present embodiment provides specifically can be ATM-PON, based on polytype EPONs such as the EPON of Ethernet or WDM-PON, do not enumerate one by one at this.
Optional; The passive optical network that the embodiment of the invention provides; Optical line terminal wherein can also comprise: controller, and after being used for the acceptance test control command or satisfying the test trigger condition, the transceiver corresponding to the testing data passage sends test instruction; Send the first test light signal to start the corresponding transceiver of testing data passage, and the detection starting device receives the second test light signal.
Optional, optical line terminal also comprises: tunable filter is used for other light signals outside the filtering second test light signal, so that the second test light signal gets into checkout gear.
Further, controller can also be used for: other transceivers outside the corresponding transceiver of testing data passage send halt instruction, and halt instruction is used for indication and stops to send downstream signal.Perhaps, controller can also be used for: transceiver and other transceiver corresponding to the testing data passage send halt instruction.
The OLT31 that relates in the present embodiment, the detailed process that its concrete structure and execution optical fiber link thereof detect can repeat no more at this referring to the embodiment of optical line terminal provided by the invention.
The passive optical network that present embodiment provides; Send the first test light signal that is used for the detection fiber link through the transceiver among the OLT; And be provided in OLT receiving that the first test light signal transmits the second test light signal that returns in data channel and draw link detecting result's checkout gear according to the second test light signal; Thereby the checkout gear function that will carry out link detecting is integrated into the OLT end; When the link between OLT and ONU breaks down; The transceiver that can directly start on the OLT sends the first test light signal, and adopts the checkout gear be integrated on the OLT to receive the second test light signal to draw testing result, thereby is convenient to the detection and the fault location of optical fiber link more.
In existing multiple PON system, WDM-PON has obtained application more and more widely with the advantages such as Information Security of its huge broadband capacity, similarity point to-point communication.Therefore, the present invention is an example with the WDM-PON system, and the system architecture of the passive optical network that the embodiment of the invention is provided and the optical fiber link process fault detection of execution thereof describe.
Fig. 4 is the structural representation of another embodiment of passive optical network provided by the invention; As shown in Figure 4; This WDM-PON system is comprising optical line terminal OLT 31, on the basis of Optical Distribution Network ODN32 and at least one optical network unit ONU 33; Further, ODN32 can comprise: first waveguide optical grating 321 and second waveguide optical grating 322;
First waveguide optical grating 321 and second waveguide optical grating 322 can be array waveguide grating (Array Waveguide Grating, AWG), perhaps, can also be waveguide grating router (Waveguide Grating Router, WGR).
As a kind of possible implementation, first waveguide optical grating 321 can comprise: test port and at least one first port; Second waveguide optical grating 322 can comprise at least one second port; Wherein, Because the downstream signal wavelength that each transceiver sends among the OLT31 is different; The upstream signal wavelengths that each ONU33 sends is also different; Therefore, each first port in first waveguide optical grating 321 and each second port in second waveguide optical grating 322 are usually only with the wavelength signals through a window or one-period property window.And the wavelength of the first test light signal that each transceiver sends among the OLT31 can be identical, therefore, can receive the second test light signal that arbitrary transceiver sends among the OLT31 the first test light signal returns after through the data channel transmission in the test port.
Wherein, each first port can be corresponding with transceiver and one second port in second waveguide optical grating 322 among the OLT31, can be used for the first test light signal that the OLT31 transceiver sends is sent to the second corresponding port;
Each second port can be corresponding with an ONU33, can be used to receive the first test light signal that the first corresponding port sends, and the first test light signal is exported to corresponding ONU33;
Test port can be used to receive the second test light signal, and the second test light signal is sent to the checkout gear among the OLT31.
Be example to have 64 data passages between OLT31 and the ONU33 among Fig. 4, the WDM-PON system architecture that present embodiment is provided describes, but not with this as limitation of the present invention.Having 64 transceivers among the OLT31, have 64 ONU33 in this system, is a data passages between transceiver and the ONU33.Accordingly, can comprise 64 first ports in first waveguide optical grating 321, respectively with numeral 1～64 sign, test port is with numeral 0 sign in Fig. 4; Second waveguide optical grating 322 also can comprise 64 second ports, in Fig. 4, also identifies with numeral 1～64 respectively.
Wherein, each transceiver can comprise first receiver, RSOA and WDM, and similarly, in the ONU side, each ONU also can comprise receiver, RSOA and WDM.
The checkout gear of OLT31 side can comprise second receiver and processor; The test control command that other equipment that checkout gear among the OLT31 can basis be connected with OLT31 send triggers the detection to arbitrary data channel; Perhaps OLT31 receives the detection that the local command line control command starts arbitrary data channel, and perhaps, the checkout gear among the OLT31 also can be provided with certain test trigger condition; Trigger test condition when satisfying, then trigger detection arbitrary data channel.
In the enforcement scene that present embodiment provides; When needs are tested a certain data channel; Controller can be set in OLT; To whole transceivers, or these other transceivers except that the corresponding transceiver of testing data passage send halt instructions, indicate transceiver to stop to send downstream signal through this halt instruction through this controller.
Wherein, controller starts step and controller that the corresponding transceiver of testing data passage sends the first test light signal and triggers step that other transceivers stop to send downstream signal in no particular order.Stopping transceiver transmission downstream signal specifically can realize through the data channel of cutting off RSOA or the modulated current of closing RSOA.Before the corresponding transceiver of controller startup testing data passage sends the first test light signal; Can turn-off automated power control (APC) parts of RSOA, stop the work of APC, after test is accomplished; Controller can be opened automated power control (APC) parts of RSOA, restarts APC work.
Concrete, when testing, for the transceiver of testing data passage correspondence; If stop the transmission of downstream signal, then the RSOA in the transceiver can directly send the first test light signal with data mode, if do not stop the transmission of downstream signal; Then the RSOA in the transceiver can send the first test light signal with the mode of remodulates; That is, the first test light signal is modulated at above the downstream signal, adopts the first test light signal that downstream signal is carried out amplitude modulation(PAM).The first test light signal can be pulsed optical signals, pulse train (for example: pseudorandom PN sequence) or frequency signal.RSOA can send the first test light signal through first corresponding in first waveguide optical grating 321 port; In the process that this first test light signal transmits in the data channel of correspondence; Scattering and/or reflection can take place; The second test light signal (comprising back scattering and/or reflected signal) that produces will be back to the OLT31 side along this data channel; Second light signal that returns can be through the test port in first waveguide optical grating 321; Be that No. 0 port shown in Figure 4 gets in second receiver of checkout gear, the processor in the checkout gear can be according to the type (type of the second test light signal is consistent with the type of the first test light signal usually, for example: pulsed optical signals, pulse train or frequency signal etc.) of the second test light signal; Adopt existing algorithms of different (for example: average calculating operation, related operation etc.) to handle, obtain the test curve of testing data passage.
Implement under the scene at this; Because other transceivers except that the corresponding transceiver of testing data passage all stop to send downstream signal; Therefore; Usually there are not other interference signals in the second test light signal that second receiver receives in the checkout gear, therefore, can obtain test result comparatively accurately.
In another enforcement scene that present embodiment provides, when needs were tested a certain data channel, the whole transceivers among the OLT31 can send downstream signal as usual.
Under this enforcement scene; Because other transceivers except that the corresponding transceiver of testing data passage still send downstream signal; Therefore, the back of the downstream signal that sends in all data channel all can pass through second receiver that test port gets into checkout gear to light signal.These signals are optical noises for the second test light signal.Because the intensity of the second test light signal is certain; Therefore; The quantity of other data channel is many more, the downstream signal of other corresponding data channel back strong more to light signal strength, and the signal to noise ratio of the second test light signal that second receiver in the checkout gear receives is just poor more.And under this enforcement scene; In order to obtain comparatively accurate testing result; Improve the second test light Signal-to-Noise that gets in the checkout gear; The first test light signal (for example: the PN sequence) or frequency signal can be preferably pulse train; After checkout gear receives the second test light signal, also can further improve the second test light Signal-to-Noise (for example: can average repeatedly testing the second test light signal that receives earlier, carry out the relevant test curve that calculates with the pulse train of sending again) through relevant algorithm.
In order to take into account testing result and normal downstream signal transmission.Under another enforcement scene that present embodiment provides; The back to light signal of downstream signal that tunable filter sends in other all data channel or the partial data passage of filtering except that the testing data passage can further be set in OLT, thereby shield the back of these downstream signals to the influence of light signal to the second test light signal.Wherein, the concrete setting of tunable filter and the course of work can repeat no more at this referring to the associated description among the optical line terminal embodiment.
In above-mentioned enforcement scene, OLT can one accomplishes the test of all data channel in test period, specifically can test according to the numeric order of data channel, and OLT also can only test a data passages a test period.
In addition; Owing to connect through optical fiber between first waveguide optical grating 321 and second waveguide optical grating 322; For the first port input of upward signal from first waveguide optical grating 321 that guarantees that ONU33 side direction OLT sends, and guarantee the test port input of the second test light signal from first waveguide optical grating 321, as a kind of possible implementation; As shown in Figure 5, between first waveguide optical grating 321 and second waveguide optical grating 322 circulator 34 can be arranged;
This circulator 34 can comprise: first interface 341, second interface 342 and the 3rd interface 343;
Wherein, first interface 341 is used for receiving the first test light signal that first waveguide optical grating, 321 arbitrary first ports are exported, and exports the first test light signal to the 3rd interface 343;
The 3rd interface 343 is used to receive the first test light signal that first interface is exported, and the first test light signal is sent to second corresponding in second waveguide optical grating 322 port; Also be used for receiving the second test light signal that first waveguide optical grating, 321 arbitrary first ports send, and export the second test light signal to second interface 342;
Fig. 6 is the flow chart of an embodiment of optical fiber link detection method provided by the invention; As shown in Figure 6; This method comprises: S101, optical line terminal send the first test light signal to the testing data passage; Wherein, the testing data passage is any circuit-switched data passage between optical line terminal and the optical network unit;
S102, optical line terminal receive the second test light signal that the first test light signal returns after through the testing data channel transfer;
S103, optical line terminal obtain the test curve of testing data passage according to the second test light signal.
Wherein, Can send the first test light signal to the testing data passage through the transceiver in the optical line terminal; Can receive the second test light signal that the first test light signal returns after through the testing data channel transfer through the checkout gear that is provided with in the optical line terminal, and obtain the test curve of testing data passage according to the second test light signal.
As a kind of possible implementation, the test control command that optical line terminal can send according to this locality, perhaps the test control command sent of remote equipment triggers and sends the first test light signal and receive the second test light signal to the testing data passage; As another kind of possible implementation, optical line terminal can also trigger and send the first test light signal and receive the second test light signal to the testing data passage after satisfy certain test trigger condition.
In addition, optical line terminal is before sending the first test light signal to the testing data passage, and other data channel that can also stop outside the testing data passage are sent downstream signal; Perhaps, stop to send downstream signal, get into optical line terminal to light signal, the second test light signal is caused interference to avoid the back of downstream signal to testing data passage and other data channel.
The optical fiber link detection method that the embodiment of the invention provides, the structure and the function thereof of its concrete equipment optical line terminal of realizing all can repeat no more at this with reference to the associated description of optical line terminal embodiment provided by the invention.
The optical fiber link detection method that present embodiment provides; Send the first test light signal that is used for the detection fiber link through the transceiver among the OLT; And in OLT, be provided for receiving the second test light signal that the first test light signal returns after through the testing data channel transfer and draw the checkout gear of testing result to the second test light signal, thereby be convenient to the detection and the fault location of optical fiber link more according to the back.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (15)
1. an optical line terminal is characterized in that, comprising: at least one transceiver and checkout gear;
Said transceiver is used for sending the first test light signal to the testing data passage, and wherein, said testing data passage is any circuit-switched data passage between said optical line terminal and the optical network unit;
Said checkout gear is used to receive the second test light signal that the said first test light signal returns after through said testing data channel transfer, and according to the said second test light signal, obtains the test curve of said testing data passage.
2. optical line terminal according to claim 1 is characterized in that, also comprises:
Controller; After being used for the acceptance test control command or satisfying the test trigger condition; The said transceiver corresponding to said testing data passage sends test instruction; Send the said first test light signal to start the corresponding transceiver of said testing data passage, and start said checkout gear and receive the said second test light signal.
3. optical line terminal according to claim 1 and 2 is characterized in that, also comprises:
Tunable filter is used for other light signals outside the said second test light signal of filtering, so that the said second test light signal gets into said checkout gear.
4. according to claim 2 or 3 described optical line terminals; It is characterized in that; Said controller also is used for: other transceivers outside the corresponding said transceiver of said testing data passage send halt instruction, and said halt instruction is used for indication and stops to send downstream signal.
5. optical line terminal according to claim 2 is characterized in that, said controller also is used for: said transceiver and other transceiver corresponding to said testing data passage send said halt instruction.
6. a passive optical network is characterized in that, comprising: optical line terminal, Optical Distribution Network and at least one optical network unit;
Said optical line terminal comprises: at least one transceiver and checkout gear;
Said transceiver is used for sending the first test light signal to the testing data passage; Wherein, said testing data passage is any circuit-switched data passage between said optical line terminal and the optical network unit;
Said checkout gear is used to receive the second test light signal that the said first test light signal returns after through said testing data channel transfer, and according to the said second test light signal, obtains the test curve of said testing data passage.
7. passive optical network according to claim 6 is characterized in that, said optical line terminal also comprises:
Controller; After being used for the acceptance test control command or satisfying the test trigger condition; The said transceiver corresponding to said testing data passage sends test instruction; Send the said first test light signal to start the corresponding transceiver of said testing data passage, and start said checkout gear and receive the said second test light signal.
8. according to claim 6 or 7 described passive optical networks, it is characterized in that said optical line terminal also comprises:
Tunable filter is used for other light signals outside the said second test light signal of filtering, so that the said second test light signal gets into said checkout gear.
9. according to claim 7 or 8 described passive optical networks; It is characterized in that; Said controller also is used for: other transceivers outside the corresponding said transceiver of said testing data passage send halt instruction, and said halt instruction is used for indication and stops to send downstream signal.
10. passive optical network according to claim 7 is characterized in that, said controller also is used for: said transceiver and other transceiver corresponding to said testing data passage send said halt instruction.
11. according to each described passive optical network of claim 6-10, it is characterized in that said Optical Distribution Network comprises: first waveguide optical grating and second waveguide optical grating; Said first waveguide optical grating comprises: test port and at least one first port; Said second waveguide optical grating comprises at least one second port;
Each said first port respectively with said optical line terminal in a transceiver and said second port in said second waveguide optical grating corresponding; Be used to receive the said first test light signal that corresponding said transceiver sends, and the said first test light signal is exported to corresponding said second port;
Each said second port is corresponding with a said optical network unit, is used to receive the said first test light signal that corresponding said first port sends, and the said first test light signal is exported to corresponding said optical network unit;
Said test port is used to receive the said second test light signal, and the said second test light signal is sent to the optical time domain reflectometer checkout gear in the said optical line terminal.
12. passive optical network according to claim 11 is characterized in that, also comprises between said first waveguide optical grating and second waveguide optical grating: circulator, said circulator comprises: first interface, second interface and the 3rd interface;
Said first interface is used for receiving the said first test light signal that arbitrary said first port of said first waveguide optical grating is exported, and exports the said first test light signal to said the 3rd interface;
Said the 3rd interface is used to receive the said first test light signal that said first interface is exported, and the said first test light signal is sent to said second port corresponding in said second waveguide optical grating; Also be used to receive the said second test light signal, and export the said second test light signal to said second interface;
Said second interface is used for the said second test light signal of said the 3rd interface output is sent to said checkout gear.
13. an optical fiber link detection method is characterized in that, comprising:
Optical line terminal sends the first test light signal to the testing data passage, and wherein, said testing data passage is any circuit-switched data passage between said optical line terminal and the optical network unit;
Said optical line terminal receives the second test light signal that the said first test light signal returns after through said testing data channel transfer;
Said optical line terminal obtains the test curve of said testing data passage according to the said second test light signal.
14. method according to claim 13 is characterized in that, said optical line terminal also comprised before the testing data passage sends the first test light signal:
Said optical line terminal acceptance test control command or satisfied test trigger condition;
Startup is sent the said first test light signal to said testing data passage, and starts the said second test light signal of reception.
15., it is characterized in that said optical line terminal also comprised according to claim 13 or 14 described methods before the testing data passage sends the first test light signal:
Other data channel that stop outside said testing data passage are sent downstream signal; Perhaps, stop to send downstream signal to said testing data passage and other data channel.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2011/083634 WO2013082771A1 (en) | 2011-12-07 | 2011-12-07 | Optical fiber link detection method, optical line terminal, and passive optical network system |
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