CN102082609A - Transmission method of optical line terminal (OLT), passive optical network (PON) system and optical signal - Google Patents
Transmission method of optical line terminal (OLT), passive optical network (PON) system and optical signal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
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Abstract
The invention discloses a transmission method of an optical line terminal (OLT), a passive optical network (PON) system and optical signals, wherein the optical module of the optical line terminal comprises a transmitter optical module, a receiver optical module and a wave-combining and wave-splitting module, wherein the wave-combining and wave-splitting module is connected with a wave-combining opening through a primary bidirectional optical fiber, is connected with a business opening through a secondary bidirectional optical fiber, is used for combining the optical signals from the primary bidirectional optical fiber and the transmitter optical module and transmitting the optical signals to the secondary bidirectional optical fiber, and is used for transmitting the optical signals from the secondary bidirectional optical fiber according to the wavelengths of the optical signals to the corresponding receiver optical module or the primary bidirectional optical fiber. Through the transmission method of the optical line terminal, the passive optical network system and the optical signals provided by the invention, network devices and maintenance cost are saved, and the performance of the system is improved.
Description
Technical field
The present invention relates to the communications field, relate in particular to the transmission method of a kind of optical line terminal (Optical Line Terminal abbreviates OLT as), EPON (Passive Optical Network abbreviates PON as) system and light signal.
Background technology
PON is a kind of novel Optical Access Network technology, adopts point to multipoint configuration, passive fiber transmission, and multiple business is provided on Ethernet.PON is made up of the optical line terminal of local side side, the optical network unit of user side (OpticalNetwork Unit abbreviates ONU as) and Optical Distribution Network (Optical Distribution Network abbreviates ODN as).Light signal transmits between OLT and ONU, does not have active device on the signalling channel, and its inner member comprises: optical fiber, passive combiner, passive optical coupler/sheer.Nowadays, the PON technology has obtained using extremely widely, and the PON network spreads all over all over the world on a large scale.
Fig. 1 is the schematic diagram according to the PON system of correlation technique, and as shown in Figure 1, optical module is a device indispensable in the PON system, and it is connecting communication apparatus and optical fiber, finishes the function of light/electricity, electricity/light conversion.Fig. 2 is the schematic diagram according to optical module in the PON system of correlation technique, and as shown in Figure 2, the optical module in the PON system is the single fiber bi-directional structure, and reception/transmission is distinguished by different wavelength.Optical module in the PON system can be realized with the mode of " single fiber bi-directional optical assembly (Bidirectional Optical Subassembly; abbreviate BOSA as)+circuit board ", also can use planar optical waveguide (Planar Lighwave Circuit abbreviates PLC as) mode to realize.
What the optical module in the PON system of industry main flow adopted usually is preceding a kind of implementation.Fig. 3 is the internal structure schematic diagram according to optical module in the PON system of correlation technique, as shown in Figure 3, at receiving terminal, the light signal that BOSA sends optical fiber here converts analog electrical signal to, be connected to circuit board by pin, circuit board converts analog electrical signal to standard compliant digital signal, gives optical module subsequent conditioning circuit in addition and continues to handle; At transmitting terminal, circuit board converts standard compliant digital signal to analog electrical signal, gives BOSA by pin, and BOSA converts analog electrical signal to light signal, is sent in the optical fiber.
In optical module, BOSA is very important device, and it is getting in touch light and electricity, is the highest device of cost in the overall optical module.Fig. 4 is the internal structure schematic diagram according to the BOSA of correlation technique, as shown in Figure 4, BOSA can be by receiving optical assembly (Receiver Optical Subassembly, abbreviate ROSA as), send compositions such as optical assembly (Transmitter Optical Subassembly abbreviates TOSA as), light splitting piece, lens.Wherein, the effect of light splitting piece is by wavelength the light that sends, receives separately, and for example, at receiving terminal, the light that sends in the optical fiber is given ROSA after the light splitting piece reflection, and at transmitting terminal, the light transmission light splitting piece that TOSA sends is given optical fiber; The effect of lens is to focus on.Be in the correlation technique, PON BOSA only handles the transmitting-receiving of a pair of light signal (two kinds of wavelength).
Optical time domain reflectometer (Optical Time Domain Reflectometer, abbreviate OTDR as) be the backscattering that produced of Rayleigh scattering when utilizing light in optical fiber, to transmit and Fresnel reflection and the optoelectronic integration instrument of the precision made, it is widely used among the maintenance, construction of lightguide cable link, can carry out the measurement of transmission attenuation, the joint decay of fiber lengths, optical fiber and fault location etc.
Briefly, the operation principle of OTDR is similar to a radar.It earlier sends a signal to optical fiber, and what information is observed then and a bit returns what come from certain is.In concrete the application, OTDR is by launching light pulse in optical fiber, receiving the information of returning at the OTDR port then and carry out.When light pulse is transmitted in optical fiber, can produce scattering and reflection owing to character, connector, junction point, bending or other similar incident of optical fiber itself, wherein Yi Bufen scattering and reflection will turn back among the OTDR.The useful information that returns is measured by the detector of OTDR, and they are just as time on the diverse location in the optical fiber or curve segment.From transmitting signals to the used time of inverse signal, determine that again the speed of light in glass substance just can calculate distance.
Following formula has illustrated that OTDR is a measuring distance how.
d＝(c×t)/2(IOR)
In the above-mentioned formula: the d-distance, c-light speed in a vacuum, the t-signal is launched the back to the total time that receives signal (round trip), the refractive index of IOR-tested optical fiber.
At present, the PON technology has obtained using extremely widely, and the PON network spreads all over all over the world on a large scale, and the maintenance of lightguide cable link, construction are starved of the OTDR technology.Fig. 5 is the using method schematic diagram according to the OTDR of correlation technique, and as shown in Figure 5, what suppose the needs detection is trunk optical fiber, total n road.OTDR connects the 1:n switch; Between OLT and trunk optical fiber, be connected in series multiplexer/demultiplexer, go into trunk optical fiber the regular traffic of the detection light of OTDR and OLT is photosynthetic by multiplexer/demultiplexer.During detection, detect trunk optical fiber 1 earlier, with 1:n switch connection the 1 tunnel, OTDR sends detection signal (light pulse), receives the light signal that returns afterwards, analyzes and draws testing result; Repeat above-mentioned steps, detect until the n road and finish.But the method has a defective: if the optical fiber between OLT and the multiplexer/demultiplexer (the optical fiber 1～optical fiber n among Fig. 5) goes wrong, then OTDR will detect less than the light signal that returns.
Summary of the invention
Main purpose of the present invention is to provide a kind of transmission plan of light signal, causes the problem of OTDR detection less than the light signal that returns to solve at least in the above-mentioned correlation technique owing to the optical fiber between OLT and the multiplexer/demultiplexer breaks down easily.
To achieve these goals, according to an aspect of the present invention, provide a kind of OLT.
According to OLT of the present invention, its optical module comprises: send optical module, receive optical module and close the wave separater module, wherein, close the wave separater module, by the first single fiber bi-directional optical fiber with close the ripple mouth and link to each other, link to each other with the functional area by the second single fiber bi-directional optical fiber, be used for and be sent to the second single fiber bi-directional optical fiber after the light signal merging from the first single fiber bi-directional optical fiber and transmission optical module; And will be sent to corresponding the reception optical module or the first single fiber bi-directional optical fiber respectively according to its wavelength from the light signal of the second single fiber bi-directional optical fiber.
Further, close the incoming end that the ripple mouth is OTDR, the functional area is the functional area of PON.
Further, closing the ripple mouth is the GPON incoming end, and the functional area is the functional area of XGPON.
Further, optical module also comprises BOSA, closes the wave separater module and is contained in BOSA.
Further, close the wave separater module and comprise lens and light splitting piece, the wavelength of light splitting piece select to depend on following one of at least: close the ripple mouth the transmission wavelength, close the ripple mouth the reception wavelength, send the wavelength that optical module sends light signal, the wavelength that receives the optical module receiving optical signals.
Further, light splitting piece comprises first light splitting piece and second light splitting piece, wherein, and first light splitting piece, being used for will be from light signal total reflection to the second light splitting piece of the first single fiber bi-directional optical fiber, and light signal total reflection to the first single fiber bi-directional optical fiber from second light splitting piece that will receive; Second light splitting piece is used for from light signal transparent transmission to the second single fiber bi-directional optical fiber that sends optical module, will from the light signal of the second single fiber bi-directional optical fiber with the Wavelength matched light signal transparent transmission that receives the optical module receiving optical signals to receiving optical module; And light signal total reflection to the second single fiber bi-directional optical fiber from first light splitting piece that will receive, with in the light signal of the second single fiber bi-directional optical fiber with close Wavelength matched light signal total reflection to the first light splitting piece of reception of ripple mouth.
Further, the second single fiber bi-directional optical fiber is trunk optical fiber.
To achieve these goals, according to a further aspect in the invention, provide a kind of PON.
According to PON of the present invention, comprise OTDR and OLT, wherein, the optical module of OLT comprises: send optical module, receive optical module and close the wave separater module, wherein, close the wave separater module, link to each other with the incoming end of OTDR by the first single fiber bi-directional optical fiber, link to each other with the functional area of PON by the second single fiber bi-directional optical fiber, be used for and be sent to the second single fiber bi-directional optical fiber after the light signal merging from the first single fiber bi-directional optical fiber and transmission optical module; And will be sent to corresponding the reception optical module or the first single fiber bi-directional optical fiber respectively according to its wavelength from the light signal of the second single fiber bi-directional optical fiber.
To achieve these goals, according to another aspect of the invention, also provide a kind of transmission method of light signal.
Transmission method according to light signal of the present invention may further comprise the steps: closing in the optical module of OLT will be sent to the second single fiber bi-directional optical fiber after the wave separater module will merge from the light signal of the transmission optical module in the first single fiber bi-directional optical fiber and the optical module; And will be sent to the reception optical module or the first single fiber bi-directional optical fiber in the corresponding optical module respectively according to its wavelength from the light signal of the second single fiber bi-directional optical fiber; Wherein, close the wave separater module by the first single fiber bi-directional optical fiber with close the ripple mouth and link to each other, link to each other with the functional area by the second single fiber bi-directional optical fiber.
Further, close among the BOSA that the wave separater module is contained in optical module, wherein, close the wave separater module and comprise lens and light splitting piece, the wavelength of light splitting piece select to depend on following one of at least: close the ripple mouth the transmission wavelength, close the ripple mouth the reception wavelength, send the wavelength that optical module sends light signal, the wavelength that receives the optical module receiving optical signals.
By the present invention, employing increases a single fiber bi-directional He Bokou and a mode of closing the wave separater module in the optical module of OLT, solved in the correlation technique and caused the problem of OTDR detection less than the light signal that returns owing to the optical fiber between OLT and the multiplexer/demultiplexer breaks down easily, save device and maintenance cost, improved the performance of system.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the PON system of correlation technique;
Fig. 2 is the schematic diagram according to optical module in the PON system of correlation technique;
Fig. 3 is the internal structure schematic diagram according to optical module in the PON system of correlation technique;
Fig. 4 is the internal structure schematic diagram according to the PONBOSA of correlation technique;
Fig. 5 is the using method schematic diagram according to the OTDR of correlation technique;
Fig. 6 is the structured flowchart according to the OLT of the embodiment of the invention;
Fig. 7 is the structured flowchart according to the PON of the embodiment of the invention;
Fig. 8 is the flow chart according to the transmission method of the light signal of the embodiment of the invention;
Fig. 9 is the optical module schematic representation of apparatus according to the embodiment of the invention one;
Figure 10 is the schematic diagram according to the optical module device OTDR application of the embodiment of the invention one;
Figure 11 is the schematic diagram according to the optical module device XGPON application of the embodiment of the invention one;
Figure 12 is the optical module schematic representation of apparatus according to the embodiment of the invention two;
Figure 13 is the schematic diagram according to the optical module device OTDR application of the embodiment of the invention two;
Figure 14 is the schematic diagram according to the optical module device XGPON application of the embodiment of the invention two.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
According to the embodiment of the invention, provide a kind of OLT.Fig. 6 is the structured flowchart according to the OLT of the embodiment of the invention, as shown in Figure 6, the optical module 60 of OLT comprises: send optical module 62, receive optical module 64 and close wave separater module 66, wherein, close wave separater module 66, by the first single fiber bi-directional optical fiber with close the ripple mouth and link to each other, link to each other with the functional area by the second single fiber bi-directional optical fiber, be sent to the second single fiber bi-directional optical fiber after being used for merging from the first single fiber bi-directional optical fiber and the light signal that sends optical module 62; And will be sent to corresponding the reception optical module 64 or the first single fiber bi-directional optical fiber respectively according to its wavelength from the light signal of the second single fiber bi-directional optical fiber.
By above-mentioned OLT, employing increases a single fiber bi-directional (promptly in optical module 60, the first single fiber bi-directional optical fiber) He Bokou and a mode of closing wave separater module 66, solved in the correlation technique and be arranged on outside the OLT owing to multiplexer/demultiplexer, optical fiber between OLT and the multiplexer/demultiplexer breaks down easily and causes the problem of OTDR detection less than the light signal that returns, save network devices and maintenance cost, improved the performance of system.
Preferably, close the incoming end that the ripple mouth is OTDR, the functional area is the functional area of passive optical network PON.This method makes OTDR can utilize this OLT to measure, and has improved the success rate that OTDR measures.
Preferably, closing the ripple mouth is the GPON incoming end, and the functional area is the functional area of XGPON.This method can improve the compatibility and the flexibility of system.
Preferably, optical module 60 also comprises BOSA, closes wave separater module 66 and is contained in BOSA.This method is simple and practical, workable.
Preferably, close wave separater module 66 and can comprise lens and light splitting piece, the wavelength of light splitting piece select to depend on following one of at least: close the ripple mouth the transmission wavelength, close the ripple mouth the reception wavelength, send the wavelength that optical module 62 sends light signals, the wavelength that receives optical module 64 receiving optical signals.For example, at first determine the transmission wavelength that closes the ripple mouth that links to each other with the first single fiber bi-directional optical fiber and receive wavelength, and send the wavelength that optical module 62 sends the wavelength of light signal and receives optical module 64 receiving optical signals; And then select suitable light splitting piece according to the above-mentioned wavelength of determining.This method can improve the validity and the accuracy of system.
Preferably, light splitting piece can comprise first light splitting piece and second light splitting piece, wherein, and first light splitting piece, being used for will be from light signal total reflection to the second light splitting piece of the first single fiber bi-directional optical fiber, and light signal total reflection to the first single fiber bi-directional optical fiber from second light splitting piece that will receive; Second light splitting piece is used for from light signal transparent transmission to the second single fiber bi-directional optical fiber that sends optical module 62, will from the light signal of the second single fiber bi-directional optical fiber with the Wavelength matched light signal transparent transmission that receives optical module 64 receiving optical signals to receiving optical module 64; And light signal total reflection to the second single fiber bi-directional optical fiber from first light splitting piece that will receive, with in the light signal of the second single fiber bi-directional optical fiber with close Wavelength matched light signal total reflection to the first light splitting piece of reception of ripple mouth.This method is simple and practical, workable.
Need to prove, be under the situation of incoming end of OTDR at He Bokou, and the described transmission wavelength that closes the ripple mouth can be identical with receiving wavelength.
Preferably, the second single fiber bi-directional optical fiber is trunk optical fiber.For example, closing wave separater module 66 links to each other with the functional area by trunk optical fiber, during transmission, the light signal that transmits in the trunk optical fiber through closing wave separater module 66 synthetic, comprise the light signal that sends in the optical module 62 and by the first single fiber bi-directional optical fiber from closing the light signal that the ripple mouth inserts; During reception, closing wave separater module 66 is that the light signal that will transmit in the trunk optical fiber is sent to corresponding reception optical module 64 respectively or passes through the He Bokou that the first single fiber bi-directional optical fiber connects according to its wavelength situation.
According to the embodiment of the invention, also provide a kind of PON.Fig. 7 is the structured flowchart according to the PON of the embodiment of the invention, as shown in Figure 7, this PON comprises OTDR 72 and above-mentioned OLT, wherein, the optical module 60 of OLT comprises: send optical module 62, receive optical module 64 and close wave separater module 66, wherein, close wave separater module 66, link to each other (promptly with the incoming end of OTDR 72 by the first single fiber bi-directional optical fiber, close the incoming end that the ripple mouth is OTDR 72 this moment), link to each other with the functional area of PON by the second single fiber bi-directional optical fiber, be used for and be sent to the second single fiber bi-directional optical fiber after the light signal merging from the first single fiber bi-directional optical fiber and transmission optical module 62; And will be sent to corresponding the reception optical module 64 or the first single fiber bi-directional optical fiber respectively according to its wavelength from the light signal of the second single fiber bi-directional optical fiber.
Corresponding to above-mentioned OLT, the invention process also provides a kind of transmission method of light signal.Fig. 8 is the flow chart according to the transmission method of the light signal of the embodiment of the invention, and this method may further comprise the steps:
Step S802, closing in the optical module 60 of OLT will be sent to the second single fiber bi-directional optical fiber after 66 of wavelength-division modes will merge from the light signal of the transmission optical module 62 in the first single fiber bi-directional optical fiber and the optical module; And
Step S804 closes wave separater module 66 and will be sent to the reception optical module 64 or the first single fiber bi-directional optical fiber in the corresponding optical module respectively according to its wavelength from the light signal of the second single fiber bi-directional optical fiber;
Wherein, close wave separater module 66 by the first single fiber bi-directional optical fiber with close the ripple mouth and link to each other, link to each other with the functional area by the second single fiber bi-directional optical fiber.
Pass through above-mentioned steps, employing increases a single fiber bi-directional He Bokou and a mode of closing wave separater module 66 in the optical module 60 of OLT, solved in the correlation technique and be arranged on outside the OLT owing to multiplexer/demultiplexer, optical fiber between OLT and the multiplexer/demultiplexer breaks down easily and causes the problem of OTDR detection less than the light signal that returns, save network devices and maintenance cost, improved the performance of system.
Preferably, close among the single fiber bi-directional optical assembly BOSA that wave separater module 66 is contained in optical module 60, wherein, close wave separater module 66 and comprise lens and light splitting piece, the wavelength of light splitting piece select to depend on following one of at least: the transmission wavelength of He Bokou (that is, by the first single fiber bi-directional optical fiber with close wave separater module 66 and link to each other), close the ripple mouth the reception wavelength, send the wavelength that optical module 62 sends light signals, the wavelength of reception optical module 64 receiving optical signals.
In specific implementation process, light splitting piece can comprise first light splitting piece and second light splitting piece, in step S802, first light splitting piece can be with light signal total reflection to the second light splitting piece from the first single fiber bi-directional optical fiber, and second light splitting piece can be with light signal total reflection to the second single fiber bi-directional optical fiber from first light splitting piece that receives; And second light splitting piece can send light signal transparent transmission to the second single fiber bi-directional optical fiber that optical module 62 sends.In step S804, second light splitting piece can with from the light signal of the second single fiber bi-directional optical fiber with the Wavelength matched light signal transparent transmission that receives optical module 64 receiving optical signals to receiving optical module 64, can with in the light signal of the second single fiber bi-directional optical fiber with Wavelength matched light signal total reflection to the first light splitting piece of reception that closes the ripple mouth; And first light splitting piece can be with light signal total reflection to the first single fiber bi-directional optical fiber that receives from second light splitting piece.
Be elaborated below in conjunction with the implementation procedure of preferred embodiments and drawings to the foregoing description.
Embodiment one
Present embodiment provides a kind of optical module device that closes the ripple mouth that has, and extra optical interface (calling He Bokou in the following text) can be provided, and light signal is incorporated in the optical fiber many in inside modules, for OTDR or other business are provided convenience.And the PON optical module can only be handled a pair of transmission, receiving optical signals in the correlation technique.
Fig. 9 is the optical module schematic representation of apparatus according to the embodiment of the invention one, as shown in Figure 9, increases an optical fiber access port as closing the ripple mouth on the PON optical module; Close ripple/partial wave module inner the increasing of optical module, close the light of ripple mouth and the photosynthetic ripple/partial wave of functional area by this module handle, make OTDR or other business directly be linked into the functional area, save outside optical fiber, optical switch, close device such as ripple optical splitter in optical module inside.
Be applied as example with OTDR, suppose that the optical fiber that needs to detect is the optical fiber of functional area, OTDR uses wavelength X
1, the professional up wavelength of PON (OLT receives wavelength) is λ
2, downstream wavelength (OLT sends wavelength) is λ
3Figure 10 is the schematic diagram according to the optical module device OTDR application of the embodiment of the invention one, as shown in figure 10, the ripple mouth is closed in the OTDR access, and during detection, it is λ that OTDR sends wavelength
1Light signal, optical module inside (for example, send optical module be TOSA) sends wavelength is λ
3Light signal, the light signal ECDC ripple of these two kinds of wavelength/partial wave module is sent in the optical fiber of functional area after merging, wavelength is λ
1Light signal in the optical fiber of functional area, transmit, reflect, returning the light signal and the wavelength that come is λ
2Light signal enter optical module from the functional area together, again by closing ripple/partial wave module with λ
1And λ
2Light signal separately, deliver to OTDR and optical module inside (for example, receiving optical module is ROSA) respectively.
Be applied as example with XGPON, suppose that 10G GPON downstream wavelength is λ
4, up wavelength is λ
5, the GPON downstream wavelength is λ
6, up wavelength is λ
7Figure 11 is according to the schematic diagram of the optical module device XGPON application of the embodiment of the invention one, as shown in figure 11, the GPON service access is closed the ripple mouth, and during transmission, it is λ that the GPON business is sent wavelength
6Light signal, (for example, TOSA) sending wavelength is λ in optical module inside
4Light signal, the light signal ECDC ripple of these two kinds of wavelength/partial wave module is sent in the optical fiber of XGPON functional area after merging; During reception, wavelength is λ
5Light signal and wavelength be λ
7Light signal enter optical module from the XGPON functional area together, by closing ripple/partial wave module separately, deliver to GPON functional area and optical module inside respectively (for example, ROSA) again with the light signal of these two kinds of wavelength.
As seen, the optical module device in the present embodiment (that is, He Bokou), closes ripple/partial wave module one of the inner increase of optical module by increasing a single fiber bi-directional optical interface, the extra traffic access is provided, for example, extra business can be that OTDR inserts, and also can be the business of PON system.When being applied to OTDR, can save 1:n switch, multiplexer/demultiplexer, also solved optical fiber (the optical fiber 1～optical fiber n among Fig. 5) between OLT and the multiplexer/demultiplexer detect less than problem; When being applied to the XGPON system, the GPON business directly can be incorporated into 10G GPON business, form the XGPON mixed service, make that the wiring of OLT equipment light surround interface is simple and convenient, save the cost of safeguarding.
Embodiment two
The PON optical module of realizing in " BOSA+ circuit board " mode is an example, in specific implementation process, and can be in BOSA with the above-mentioned ripple/partial wave module package of closing.That is, improve existing BOSA structure, increase lens and two light splitting pieces.
Figure 12 is the optical module schematic representation of apparatus according to the embodiment of the invention two, and as shown in figure 12, light splitting piece a is closing the light total reflection of ripple mouth to light splitting piece b; Light splitting piece b can select according to wavelength, and for the light of functional area, light splitting piece b is equivalent to transparent, allows the light transmission of functional area, and for the light that closes the ripple mouth, light splitting piece b total reflection allows in the photosynthetic optical fiber of going into the regular traffic end that closes the ripple mouth.
Figure 13 is the schematic diagram according to the optical module device OTDR application of the embodiment of the invention two, as shown in figure 13, is example with OTDR, OTDR is inserted close the ripple mouth, thereby economize 1:n switch, multiplexer/demultiplexer (shown in Fig. 5) in the de-correlation technique.In this application, light splitting piece a is actually reflector plate.The operation wavelength of supposing OTDR is 1625nm, and the transmission wavelength of functional area is 1490nm, and receiving wavelength is 1310nm.During detection, OTDR sends the light signal of 1625nm wavelength, in lens enter BOSA, reflector plate a with its total reflection to light splitting piece b, light splitting piece b is with the light transparent transmission of 1490nm, 1310nm wavelength, with the light total reflection of 1625nm wavelength, to send in the optical fiber (optical fiber to be detected) of functional area, the light signal of 1625nm wavelength transmits in optical fiber, return the light signal that comes and behind lens, deliver to light splitting piece b, total reflection is to reflector plate a, and total reflection is analyzed to OTDR once more, thereby finishes one-time detection.When not detecting, close the ripple mouth and can seal up, with common PON module application indistinction with the optical fiber plug.
Figure 14 is the schematic diagram according to the optical module device XGPON application of the embodiment of the invention two, as shown in figure 14, is example with XGPON, and the GPON service access is closed the ripple mouth.The operation wavelength of 10G GPON OLT is: send wavelength 1577nm, receive wavelength 1270nm; The operation wavelength of GPON OLT is: send wavelength 1490nm, receive wavelength 1310nm.During with the GPON service access, transmitting terminal, GPON sends the light signal of 1490nm wavelength, enter in the BOSA through lens, light splitting piece a with its total reflection to light splitting piece b, light splitting piece b with the light signal total reflection of 1490nm wavelength, sends into optical fiber (XGPON incoming end) with the light transparent transmission of 1577nm, 1270nm wavelength; Receiving terminal, the light signal of 1310nm wavelength is delivered to light splitting piece b through lens in the optical fiber (XGPON incoming end), light splitting piece b with its total reflection to light splitting piece a, light splitting piece a with its once more total reflection send into optical fiber (GPON incoming end).Like this, can be implemented in the optical module GPON, 10G GPON mix of traffic are inserted, save peripheral devices such as multiplexer/demultiplexer, and easy to use.When not needing GPON professional, the GPON incoming end can be sealed up with the optical fiber plug, and XGPON can be used as common 10G GPON service application.
Need to prove that only set forth the thought of the embodiment of the invention here from two application, certainly, other similar application is also within protection range of the present invention.
In sum, pass through the embodiment of the invention, employing increases a single fiber bi-directional He Bokou and a mode of closing the wave separater module in optical module, solved in the correlation technique and caused the problem of OTDR detection less than the light signal that returns owing to the optical fiber between OLT and the multiplexer/demultiplexer breaks down easily, save network devices and maintenance cost, improved the performance of system.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an optical line terminal OLT is characterized in that, the optical module of described OLT comprises: send optical module, receive optical module and close the wave separater module, wherein,
The described wave separater module of closing, by the first single fiber bi-directional optical fiber with close the ripple mouth and link to each other, link to each other with the functional area by the second single fiber bi-directional optical fiber, be used for and be sent to the described second single fiber bi-directional optical fiber after the light signal merging from described first single fiber bi-directional optical fiber and described transmission optical module; And will be sent to corresponding described reception optical module or the described first single fiber bi-directional optical fiber respectively according to its wavelength from the light signal of the described second single fiber bi-directional optical fiber.
2. OLT according to claim 1 is characterized in that, describedly closes the incoming end that the ripple mouth is optical time domain reflectometer OTDR, and described functional area is the functional area of passive optical network PON.
3. OLT according to claim 1 is characterized in that, the described ripple mouth that closes is the GPON incoming end, and described functional area is the functional area of XGPON.
4. OLT according to claim 1 is characterized in that, described optical module also comprises single fiber bi-directional optical assembly BOSA, and the described wave separater module of closing is contained in described BOSA.
5. OLT according to claim 1, it is characterized in that, the described wave separater module of closing comprises lens and light splitting piece, the wavelength of described light splitting piece select to depend on following one of at least: the described transmission wavelength that closes the ripple mouth, describedly close the reception wavelength of ripple mouth, described transmission optical module sends the wavelength of light signal, the wavelength of described reception optical module receiving optical signals.
6. OLT according to claim 5 is characterized in that, described light splitting piece comprises first light splitting piece and second light splitting piece, wherein,
Described first light splitting piece, be used for from the light signal total reflection of the described first single fiber bi-directional optical fiber to described second light splitting piece, and will receive from the light signal total reflection of described second light splitting piece to the described first single fiber bi-directional optical fiber;
Described second light splitting piece, being used for will be from the light signal transparent transmission of described transmission optical module to the described second single fiber bi-directional optical fiber, will from the light signal of the described second single fiber bi-directional optical fiber with the Wavelength matched light signal transparent transmission of described reception optical module receiving optical signals to described reception optical module; And will receive from the light signal total reflection of described first light splitting piece to the described second single fiber bi-directional optical fiber, with in the light signal of the described second single fiber bi-directional optical fiber with the Wavelength matched light signal total reflection of described reception of closing the ripple mouth to described first light splitting piece.
7. according to each described OLT in the claim 1 to 6, it is characterized in that the described second single fiber bi-directional optical fiber is trunk optical fiber.
8. passive optical network PON, it is characterized in that, comprise optical time domain reflectometer OTDR and optical line terminal OLT, wherein, the optical module of described OLT comprises: send optical module, receive optical module and close the wave separater module, wherein, the described wave separater module of closing, link to each other with the incoming end of described OTDR by the first single fiber bi-directional optical fiber, link to each other with the functional area of described PON by the second single fiber bi-directional optical fiber, be used for and be sent to the described second single fiber bi-directional optical fiber after the light signal merging from described first single fiber bi-directional optical fiber and described transmission optical module; And will be sent to corresponding described reception optical module or the described first single fiber bi-directional optical fiber respectively according to its wavelength from the light signal of the described second single fiber bi-directional optical fiber.
9. the transmission method of a light signal is characterized in that, may further comprise the steps:
Closing in the optical module of optical line terminal OLT will be sent to the second single fiber bi-directional optical fiber after the wave separater module will merge from the light signal of the transmission optical module in the first single fiber bi-directional optical fiber and the described optical module; And will be sent to reception optical module or the described first single fiber bi-directional optical fiber in the corresponding described optical module respectively according to its wavelength from the light signal of the described second single fiber bi-directional optical fiber;
Wherein, described close the wave separater module by the described first single fiber bi-directional optical fiber with close the ripple mouth and link to each other, link to each other with the functional area by the described second single fiber bi-directional optical fiber.
10. method according to claim 9, it is characterized in that, described closing among the single fiber bi-directional optical assembly BOSA that the wave separater module is contained in described optical module, wherein, the described wave separater module of closing comprises lens and light splitting piece, the wavelength of described light splitting piece select to depend on following one of at least: the described transmission wavelength that closes the ripple mouth, describedly close the reception wavelength of ripple mouth, described transmission optical module sends the wavelength of light signal, the wavelength of described reception optical module receiving optical signals.
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| CN2011100240548A CN102082609A (en) | 2011-01-21 | 2011-01-21 | Transmission method of optical line terminal (OLT), passive optical network (PON) system and optical signal |
| PCT/CN2011/073785 WO2012097554A1 (en) | 2011-01-21 | 2011-05-06 | Optical line terminal, passive optical network system and optical signal transmission method |
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| CN2011100240548A CN102082609A (en) | 2011-01-21 | 2011-01-21 | Transmission method of optical line terminal (OLT), passive optical network (PON) system and optical signal |
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