CN101640962A - Seed light source device with protection function and realization method - Google Patents
Seed light source device with protection function and realization method Download PDFInfo
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- CN101640962A CN101640962A CN200910170335A CN200910170335A CN101640962A CN 101640962 A CN101640962 A CN 101640962A CN 200910170335 A CN200910170335 A CN 200910170335A CN 200910170335 A CN200910170335 A CN 200910170335A CN 101640962 A CN101640962 A CN 101640962A
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Abstract
The invention discloses a seed light source device with protection function and a realization method, relating to the technical field of optical communication. The device comprises a BLS light source,a detection unit and a control unit, wherein the BLS light source comprises a plurality of DFB-LD lasers and a plurality of adjustable lasers, and the DFB-LD lasers respectively output signal light with different special wavelengths; the detection unit detects the light power of signal light outputted by each DFB-LD laser in the BLS light source; and after receiving the fault signal of the signallight with a certain wavelength or a plurality of wavelengths sent by the detection unit, the control unit starts the relative adjustable lasers to output signal light having the same wavelength as that of the fault signal light. The invention solves the problem of light power requirement of the seed light source at an ONU side in HPON, meanwhile enhances the robustness of a whole network and reduces the maintenance cost and the inventory cost of the whole system.
Description
Technical field
The present invention relates to the optical communication technique field, especially relate to the seed light source device and the implementation method that have defencive function in wavelength-division EPON (WDM-PON) or the wavelength-division and time-division multiplexing passive optical-fiber network (WDM-TDM PON).
Background technology
In recent years, along with the continuous progress of expanding economy and society, people have proposed requirements at the higher level to obtaining of the network information.Although the access rate of communication access net had obtained remarkable improvement in recent years, but because the fast development of broadband services, existing is the needs that main copper wire access technology still can't satisfy the user with DSL (Digital Subscriber Line, Digital Subscriber Line) technology.In addition, original wired TV one-way coaxial cable distribution net also can't satisfy translation of broadcasting and TV Digital Television and two-way communication requirement.Therefore, operator has begun to start FTTx (optical fiber to the abbreviation of x, for example FTTH, FTTC, FTTB etc.) and has built.Along with operator begins Large scale construction FTTx network, the present metropolitan area fiber resource particularly present situation of conduit resource anxiety will become more outstanding.Because WDM PON and WDM-TDM PON (HPON) can directly utilize existing metropolitan area fibre circuit, reduce construction funds invested, shorten the construction period, are the preferred embodiments that solves bandwidth, speed and resource anxiety at present therefore.
In WDM PON or WDM-TDM PON (HPON) network, Access Network is very responsive to economy, if all adopt the light source of independent specific wavelength in OLT, ONU side, has increased inventory cost and maintenance cost undoubtedly.The scheme that solves OLT, ONU sidelight source at present has following several scheme: adopt DFB-LD tunable laser mode, adopt reflective semiconductor amplifier mode (RSOA), adopt injection locking FP-LD mode (Injected-locking FP-LD) and wideband light source (BLS, broadband light source) spectrum partitioning scheme.Adopt the DFB-LD tunable laser can reach very high modulation rate, but this mode cost is very high, and has increased the complexity of control.RSOA and injection locking FP-LD mode need the very high seed light source of luminous power, and especially the seed light source luminous power of ONU side needs higher power, and OLT side and ONU sidelight source need the double copies protection simultaneously, have increased cost.The scheme cost that wideband light source is cut apart is lower, especially is fit to be applied to the Access Network of cost sensitivity, cuts apart and causes optical power loss to strengthen but shortcoming is a frequency spectrum, causes the power budget anxiety, and high modulation speed is less than 1Gbps.
Take all factors into consideration from the robustness and the practicality of maintenance cost, system, reflective semiconductor amplifier (RSOA) relatively is fit to WDM PON or WDM-TDMPON (HPON) Access Network with injection locking mode (injection locking FP-LD), see Fig. 1, Fig. 2, BLS1, BLS2 are respectively downstream signal seed light source and upward signal seed light source among the figure.The light source of Chang Zuowei BLS has spontaneous emission noise (ASE), super-radiance light emitting diode (SLED) etc. and distributed feedback semiconductor laser (DFB-LD) array.Yet in actual applications,, need to change whole light source in case ASE or SLED break down, the DFB-LD array if the some lasers in this array break down, needs to change whole array too equally, maintenance cost is very high like this, and can have influence on the use of whole system.
Summary of the invention
Technical problem to be solved by this invention is the light supply apparatus maintenance cost height that solves WDM PON or WDM-TDM PON (HPON) Access Network, the problem that influences system's use.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention provides a kind of seed light source device with defencive function, comprise BLS light source, detecting unit and control unit, described BLS light source comprises a plurality of DFB-LD lasers and several tunable lasers, and a plurality of DFB-LD lasers are exported the flashlight of different specific wavelengths respectively; Described detecting unit is used for detecting the luminous power of flashlight of each DFB-LD laser output of BLS light source; Start the flashlight that corresponding tunable laser output equates with above-mentioned fault-signal optical wavelength behind the fault-signal of some or a plurality of wavelength signals light that described control unit reception detecting unit sends.
In the such scheme, the quantity of DFB-LD laser is n in the described BLS light source, and the quantity of tunable laser is m, and n 〉=2,1≤m≤n.
The present invention also provides a kind of seed light source implementation method with defencive function, may further comprise the steps:
N DFB-LD laser in A10, the BLS light source exported the flashlight of different specific wavelengths, n 〉=2 respectively;
A20, when the luminous power no-output of some or a plurality of specific wavelength flashlights, start the flashlight that one or more tunable lasers outputs equate with above-mentioned fault-signal optical wavelength.
In the seed light source device of the present invention, described BLS light source comprises a plurality of DFB-LD lasers and several tunable lasers, behind the fault-signal of some or a plurality of wavelength signals light that control unit reception detecting unit sends, start the flashlight that corresponding tunable laser output equates with above-mentioned fault-signal optical wavelength, solved the problem that the ONU side requires the seed light source luminous power among the HPON, improve the robustness of whole network simultaneously, reduced the maintenance cost and the inventory cost of whole system.
Description of drawings
Fig. 1 is typical WDM PON system construction drawing;
Fig. 2 is typical WDM-TDM PON system construction drawing;
Fig. 3 has the seed light source device structure chart of defencive function for the present invention;
Fig. 4 has the seed light source device work block diagram of defencive function for the present invention;
Fig. 5 has seed light source device embodiment one schematic diagram of defencive function for the present invention;
Fig. 6 has seed light source device embodiment two schematic diagrames of defencive function for the present invention;
Fig. 7 has seed light source device embodiment three schematic diagrames of defencive function for the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is made detailed explanation.
As shown in Figure 3, Figure 4, the seed light source device that the present invention has defencive function comprises BLS light source, detecting unit and control unit, described BLS light source comprises a plurality of DFB-LD laser lasers and several tunable lasers, a plurality of DFB-LD lasers are exported the flashlight of different specific wavelengths respectively, the output of the photosynthetic Lu Chengyi of the signal of above-mentioned a plurality of different specific wavelengths road; Described detecting unit is used for detecting the luminous power of different specific wavelength flashlights of each output of BLS light source, form by a plurality of PIN pipes, each PIN pipe changes into the signal of telecommunication with detected light signal, the signal of telecommunication is given control unit through amplifying, relatively export a level, keep communicating by letter with control unit constantly, in case detecting certain laser, certain PIN pipe do not have luminous power output, notify control unit at once, allow control unit open tunable laser, make tunable laser send out of order optical wavelength signal; The function of described control unit is the output of control BLS light source, comprise luminous power precision, centre wavelength precision etc., the function that also has the laser of opening and closing tunable laser unit simultaneously starts the flashlight that corresponding tunable laser output equates with above-mentioned fault-signal optical wavelength behind the fault-signal of some or a plurality of wavelength signals light that control unit reception detecting unit sends.
In concrete application of the present invention, the seed light source device with defencive function has three kinds of embodiment.
Embodiment one:
As shown in Figure 5, present embodiment is realized the 1:n protection of seed light source device.Since in actual applications all the DFB-LD lasers in the BLS light source (D1, D2 ..., Dn) probability that all breaks down is very low, therefore adopts a tunable laser T1 to realize the 1:n protection.Its protection philosophy is as follows: control unit control DFB-LD laser send n specific wavelength flashlight D1, D2 ..., Dn; the specific wavelength flashlight of a plurality of DFB-LD lasers output respectively by the n of correspondence WDM device C1, C2 ..., Cn tells sub-fraction and detects light and export n PIN pipe in the detecting unit correspondingly to, the flashlight of other parts passes through to be exported after MUX closes ripple.The PIN pipe of the inside of being told, the detected unit of detection light converts current signal to and conversion becomes voltage signal through I/V, and voltage signal amplifies small-signal through voltage amplifier, is convenient to detect.Voltage signal after the amplification is through over-voltage comparator; compare with threshold voltage; the high level or the low level signal of a numeral of output; this level signal exports control unit to; control unit judges whether that according to this level signal needs open tunable laser; when the PIN pipe detects the output signal light inactivity output of the some DFB-LD lasers in the BLS light source; start the flashlight that tunable laser T1 output equates with the fault-signal optical wavelength; this flashlight is replaced the flashlight of fault wavelength, thereby realizes defencive function.
Embodiment two:
One of embodiment provides a tunable laser; when m (m＜when n) the DFB-LD laser breaks down is arranged in the BLS light source; the scheme that embodiment one provides can't be protected; in actual applications; wait stage according to what the client needed protection; sometimes need to realize the protection scheme when maximum m path breaks down; be to have m DFB-LD laser to break down in the BLS light source at most; need m tunable laser to realize this moment; be that n bar path is shared m wavelength; proposed embodiment two, as shown in Figure 6, present embodiment is realized the protection scheme of m:n for this reason.That is to say; be provided with in the present embodiment m tunable laser T1, T2 ..., Tm; 1＜m＜n wherein; T1, T2 ..., Tm exports after the second wave multiplexer MUX2 closes ripple; its principle is similar to 1:n; can realize the protection when m path has fault simultaneously, strengthened the robustness of network, but cost be than 1:n scheme height.
Embodiment three:
As shown in Figure 7, the general protection that present embodiment is realized promptly realizes the protection that n path breaks down simultaneously.Protection philosophy that it is basic and 1:n, m:n are similar, and the quantity m of different is tunable laser in this scheme is identical with the quantity of DFB-LD laser n, realizes man-to-man backup, and the robustness of network is the strongest, but can cause the waste of resource, and cost is the highest.
The present invention also provides a kind of seed light source implementation method with defencive function, may further comprise the steps:
N DFB-LD laser in A10, the BLS light source exported the flashlight of different specific wavelengths, n 〉=2 respectively;
A20, when the luminous power no-output of some or a plurality of specific wavelength flashlights, start the flashlight that one or more tunable lasers outputs equate with above-mentioned fault-signal optical wavelength.
Beneficial effect of the present invention is as follows:
(1), the Output optical power height of DFB-LD laser, can solve among the HPON ONU side to the requirement of seed light source.Because optical power budget is very nervous among the HPON, and light source can produce very big frequency spectrum through RN end AAWG and cut apart differential loss, causes the seed light source luminous power sharply to descend.The proposition of this programme can solve ONU side seed light source problem among the HPON.
(2), speed is fast.Have detecting unit in this programme, when detecting some or a plurality of DFB-LD lasers among the BLS and breaking down, can open tunable laser at once, tunable laser centre wavelength is operated on the out of order wavelength, speed is fast.
(3), robustness is strong.If a DFB-LD laser breaks down among the BLS, only need open a tunable laser, change out of order DFB-LD laser simultaneously, only can have influence on the business of a passage, can not have influence on the business of rest channels.
(4), cost is low.Can adopt a plurality of DFB-LD lasers to share a tunable laser, be similar to the protection of 1:n, lower backup cost.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (3)
1, the seed light source device that has defencive function is characterized in that comprising:
BLS light source, this BLS light source comprise a plurality of DFB-LD lasers and several tunable lasers, and a plurality of DFB-LD lasers are exported the flashlight of different specific wavelengths respectively;
Detecting unit is used for detecting the luminous power of flashlight of each DFB-LD laser output of BLS light source;
Control unit starts the flashlight that corresponding tunable laser output equates with above-mentioned fault-signal optical wavelength behind the fault-signal of some or a plurality of wavelength signals light that the reception detecting unit sends.
2, the seed light source device with defencive function as claimed in claim 1, the quantity that it is characterized in that DFB-LD laser in the described BLS light source is n, the quantity of tunable laser is m, and n 〉=2,1≤m≤n.
3, have the seed light source implementation method of defencive function, it is characterized in that may further comprise the steps:
N DFB-LD laser in A10, the BLS light source exported the flashlight of different specific wavelengths, n 〉=2 respectively;
A20, when the luminous power no-output of some or a plurality of specific wavelength flashlights, start the flashlight that one or more tunable lasers outputs equate with above-mentioned fault-signal optical wavelength.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101827288A (en) * | 2010-05-24 | 2010-09-08 | 烽火通信科技股份有限公司 | Variable wavelength-based hybrid optical access system |
Citations (4)
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| CN1783764A (en) * | 2004-12-01 | 2006-06-07 | 三星电子株式会社 | Passive optical network |
| US20080019693A1 (en) * | 2006-07-18 | 2008-01-24 | Novera Optics, Inc. | Open access service model using WDM-PON |
| CN101325459A (en) * | 2007-06-15 | 2008-12-17 | 上海未来宽带技术及应用工程研究中心有限公司 | Optical fiber line protection instrument for protecting light passive network |
| CN101479897A (en) * | 2006-05-01 | 2009-07-08 | 安立股份有限公司 | Semiconductor light emitting element and variable wavelength laser light source |
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2009
- 2009-09-14 CN CN200910170335A patent/CN101640962A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1783764A (en) * | 2004-12-01 | 2006-06-07 | 三星电子株式会社 | Passive optical network |
| CN101479897A (en) * | 2006-05-01 | 2009-07-08 | 安立股份有限公司 | Semiconductor light emitting element and variable wavelength laser light source |
| US20080019693A1 (en) * | 2006-07-18 | 2008-01-24 | Novera Optics, Inc. | Open access service model using WDM-PON |
| CN101325459A (en) * | 2007-06-15 | 2008-12-17 | 上海未来宽带技术及应用工程研究中心有限公司 | Optical fiber line protection instrument for protecting light passive network |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101827288A (en) * | 2010-05-24 | 2010-09-08 | 烽火通信科技股份有限公司 | Variable wavelength-based hybrid optical access system |
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Application publication date: 20100203 |