CN102780529B - EPON and optical line terminal optical module thereof - Google Patents
EPON and optical line terminal optical module thereof Download PDFInfo
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- CN102780529B CN102780529B CN201210243663.7A CN201210243663A CN102780529B CN 102780529 B CN102780529 B CN 102780529B CN 201210243663 A CN201210243663 A CN 201210243663A CN 102780529 B CN102780529 B CN 102780529B
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Abstract
The invention discloses a kind of EPON and optical line terminal optical module thereof, described optical module comprises: at least two laser emission elements; Each laser emission element comprises CML laser and drive circuit thereof; The signal of telecommunication that the drive circuit of described laser emission element sends in order to desampler, the signal of telecommunication according to receiving drives the CML laser in this laser emission element to carry out Laser emission; Between the laser that the CML laser of different laser emission elements is launched, minimum frequency interval is equal to or greater than 50GHz.Owing to adopting CML laser in the olt, the spectrum of the laser of transmitting is controlled at below 0.2nm, and then sufficient center wavelength accuracy can also be locked on ITU-T lattice point, thus can channel spacing be reduced, reached more channel is provided, be network system dilatation, improve the object of system bandwidth.
Description
Technical field
The present invention relates to Fibre Optical Communication Technology, particularly relate to a kind of EPON and optical line terminal optical module thereof.
Background technology
Along with user is to high definition IPTV(Internet Protocol Television, Web TV), the continuous growth of video monitoring contour band width service demand, industrial circle is recognized gradually, existing EPON(EthernetPassive Optical Network, Ethernet passive optical network) and GPON(Gigabit Passive OpticalNetwork, gigabit passive optical network) technology is all difficult to the demand meeting business long-run development, particularly in Fiber-To-The-Building (FTTB) and Fiber-To-The-Node (FTTN) scene.Optical access network all faces new upgrade requirement in bandwidth, service supporting capacity and access node apparatus function and performance etc.According to analysis, the 125Mbps that the per capita bandwidth demand of each kinsfolk will increase from 30Mbps.The GEPON(gigabit ethernet passive optical network of current employing 32 road topological structure) and the transmission rate of GPON technology can reach 1Gbps and 2.5Gbps respectively, it is enough for meeting current demand.But when having more HDTV (High-Definition Television) channel and Video service to add to come in, just have too many difficulties to cope with.64 road PON(Passive OpticalNetwork of future generation, EPON) system needs to provide the bandwidth of 8.1Gbps just can satisfy the demand.Even if next generation network continues to use the topological structure on present each PON 32 tunnel, still need for home network provides the transmission rate of more than 4Gbps, this has also exceeded the capacity of existing PON.
Have in the industry 10G PON technology and WDM(wavelength division multiplexing at present) technology, in conjunction with composition WDMPON technology, the capacity of further raising system, solves the demand of the network bandwidth dilatation grown with each passing day.But, current this WDM PON technology is only based on CWDM(Coarse Wavelength DivisionMultiplexing, Coarse Wavelength Division Multiplexing) multiplexing (all-wave 16 wavelength of limited wavelength, general 4 wavelength only having used 1310 wave bands), even if introduce DWDM(Dense WaveLength DivisionMultiplexing, high density Wave division multiplexing technology) technology, be limited by the restriction of the characteristic such as spectrum width and the drift of wavelength temperature of externally modulated laser, channel spacing also just controls at 100GHz interval (C-band 45 channels).That is, the WDM PON technology of prior art still can not provide enough bandwidth, to meet growing ONU(Optical Network Unit, optical network unit) user is to the demand of Video service bandwidth.
Summary of the invention
The embodiment provides a kind of EPON and optical line terminal optical module thereof, in order to improve the network bandwidth.
According to an aspect of the present invention, provide a kind of optical line terminal optical module, comprising: at least two laser emission elements;
Each laser emission element comprises CML laser and drive circuit thereof; The signal of telecommunication that the drive circuit of described laser emission element sends in order to desampler, the signal of telecommunication according to receiving drives the CML laser in this laser emission element to carry out Laser emission;
Between the laser that the CML laser of different laser emission elements is launched, minimum frequency interval is equal to or greater than 50GHz.
Preferably, the number of described laser emission element is specially 180;
The wavelength of the laser that the CML laser of each laser emission element is launched is divided equally in C+L wave band, and between the laser that the CML laser of different laser emission elements is launched, minimum frequency interval is 50GHz.
Described optical module also comprises: laser pick-off unit;
Described laser pick-off unit, in order to receive the light signal of specific wavelength, sends to described switch after the light signal of reception is converted to the signal of telecommunication.
Preferably, the number of described laser pick-off unit is 4, and 4 laser pick-off unit receive the light signal that wavelength is 1271nm, 1291nm, 1311nm and 1331nm respectively.
Described optical module also comprises: WDM module, for the laser coupled of being launched by each laser emission element in optical fiber.
According to another aspect of the present invention, additionally provide a kind of EPON, comprising: optical line terminal optical module OLT, first wave division multiplexer WDM, array waveguide grating AWG, at least one ONU optical module;
Wherein, described OLT comprises at least two laser emission elements, and each laser emission element comprises CML laser and drive circuit thereof; The signal of telecommunication that the drive circuit of described laser emission element sends in order to desampler, the signal of telecommunication according to receiving drives the CML laser in this laser emission element to carry out Laser emission; Wherein, between the laser that the CML laser of different laser emission elements is launched, minimum frequency interval is equal to or greater than 50GHz;
The laser that each laser emission element of described OLT is launched is input to optical fiber through a WDM coupling, and after the light splitting of described Optical Fiber Transmission and described AWG, the laser that each laser emission element is launched is input to the ONU optical module corresponding to this laser emission element.
Preferably, the number of described laser emission element is specially 180;
The wavelength of the laser that the CML laser of each laser emission element is launched is divided equally in C+L wave band, and between the laser that the CML laser of different laser emission elements is launched, minimum frequency interval is 50GHz.
Described ONU optical module is also for after have received the signal of telecommunication that ONU system equipment sends, and the signal of telecommunication of reception is converted to light signal and exports, the light signal that described ONU optical module exports is sent to described OLT through described AWG, optical fiber, a WDM; And,
Described OLT also comprises laser pick-off unit, in order to receive the light signal that described ONU optical module sends, and sends to described switch after the light signal of reception is converted to the signal of telecommunication.
Described optical-fiber network also comprises: be connected to the 2nd WDM between a WDM and described AWG;
And
The number of described ONU optical module is at least four, and the wavelength of the light signal that described ONU optical module exports is one of following wavelength: 1271nm, 1291nm, 1311nm and 1331nm; The light signal that each ONU optical module exports through described AWG, and enters described optical fiber after the coupling of the 2nd WDM, is sent to described OLT through described optical fiber, a WDM;
The laser pick-off unit of described OLT is 4, respectively in order to receive the laser of 1271nm, 1291nm, 1311nm and 1331nm wavelength.
Preferably, a described WDM is the WDM module be built in described OLT.
The spectrum of the laser of transmitting controls at below 0.2nm owing to adopting CML laser in the olt by the embodiment of the present invention, and then sufficient center wavelength accuracy can also be locked on ITU-T lattice point, thus can channel spacing be reduced, reached more channel is provided, be network system dilatation, improve the object of system bandwidth.
Accompanying drawing explanation
Fig. 1 is the internal circuit schematic diagram of a laser emission element in the optical line terminal optical module of the embodiment of the present invention;
Fig. 2,4 is the optical line terminal optical module internal structure schematic diagram of the embodiment of the present invention;
Fig. 3 is the laser A of the embodiment of the present invention and the spectral characteristic schematic diagram of laser B;
Fig. 5 is the passive optical network structure schematic diagram of the embodiment of the present invention;
Fig. 6 is the EPON circuit diagram of the embodiment of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, enumerate preferred embodiment referring to accompanying drawing, the present invention is described in more detail.But it should be noted that, the many details listed in specification are only used to make reader to have a thorough understanding, even if do not have these specific details also can realize these aspects of the present invention to one or more aspect of the present invention.
The term such as " module " used in this application, " system " is intended to comprise the entity relevant to computer, such as but not limited to hardware, firmware, combination thereof, software or executory software.Such as, module can be, but be not limited in: the thread of the process that processor runs, processor, object, executable program, execution, program and/or computer.
The present inventor considers and carrys out expanding system capacity by reducing the channel spacing of WDM in OLT, reaches the object improving system bandwidth.For reducing channel spacing, the spectral width reducing laser can be passed through, or the stability improving laser center wavelength realizes.
Therefore, CML(chirp managed laser is adopted in the embodiment of the present invention, chirp management laser) as laser, the spectrum of the laser of transmitting is controlled at below 0.2nm, and then sufficient center wavelength accuracy can also be locked on ITU-T lattice point, make the skew of centre wavelength between +/-0.02nm.Like this, just can reduce channel spacing, thus can be network system dilatation, namely more channel is provided, to reach the object improving system bandwidth.Particularly, CML laser has 2 TEC(temperature to control) circuit and 2 PD(backlights) supervisory circuit, wherein TEC1 controls initial temperature and the wavelength of laser, and TEC2 controls the meticulous wavelength of laser, i.e. TEC1 coarse adjustment, TEC2 finely tunes wavelength.When the temperature is changed, two PD can produce an error correction signal, the temperature of control TEC1, make the Wavelength stabilized on ITU-T lattice point of laser.
The technical scheme of the embodiment of the present invention is described in detail below in conjunction with accompanying drawing.A laser emission element internal structure circuit block diagram in the optical line terminal optical module OLT of the embodiment of the present invention, as shown in Figure 1, comprising: CML laser 101 and drive circuit 102 thereof.
Drive circuit 102, in order to receive the signal of telecommunication of the switch transmission being arranged on the central office of the access net system of optical fiber telecommunications system, drives CML laser 101 Emission Lasers according to the signal of telecommunication received.
CML(Chirp Managed Laser, chirp management laser) laser, spectrum width can be controlled at below 0.2nm, and by radiative spectrum-stable locked mode on the wavelength lattice point of ITU-T, thus there is more excellent spectral characteristic.
The optical line terminal optical module OLT of the embodiment of the present invention, as shown in Figure 2, comprise several above-mentioned laser emission elements 201, the wavelength of the laser that each laser emission element is launched is different, the laser of different wave length provides different channels, and frequency interval minimum between the laser of different wave length can reach 50GHz; That is, between the laser that the CML laser of different laser emission elements is launched, frequency interval can be equal to or greater than 50GHz.Wavelength interval is less, and reusable wavelength channel is more, can meet the point-to-point downstream signal transmission demand of multiple ONU user terminal.
Such as, the CML laser emission center wavelength of the laser emission element A in optical line terminal optical module is the laser A(channel A of a), the CML laser emission center wavelength of the laser emission element B in optical line terminal optical module is the laser B(channel B of b).As shown in Figure 3, laser A differs 0.4nm with the centre wavelength of laser B to the spectral characteristic of laser A and laser B, and namely the frequency interval of laser A and laser B is 50GHz.
Because spectrum width can control at below 0.2nm by CML laser, and the range of drift of centre wavelength is between +/-0.02nm, lower limit b'=b-0.1-0.02=(the a+0.4)-0.1-0.02 of the therefore upper limit a'=a+0.1+0.02 of channel A, channel B; Thus obtain being spaced apart between b' and a': b '-a'=0.14; If the interval between b' and a' is greater than 0, then illustrate that channel A can not be overlapping with channel B; If the interval between b' and a' is less than or equal to 0, then illustrate that channel A can be overlapping with channel B, signal quality is by adversely effected.Thus, can find out and adopt CML laser in laser emission element, interval 50GHz between the wavelength that can meet the laser that different laser emission elements is launched, this wavelength interval than prior art is that the situation of 100GHz will make channel capacity expand to be twice.Such as, the wavelength of the laser of the CML laser transmitting of each laser emission element in optical line terminal optical module OLT is divided equally in C+L wave band, namely adopts the DWDM wavelength of C+L wave band, according to G694.1 standard, if wavelength interval is 100GHz, then 45x2 channel can be had to use; If wavelength interval is 50GHz, 90x2 channel then can be had to use, that is, the optical line terminal optical module of the embodiment of the present invention adopts C+L wave band, 180 channels can be had as downlink, as shown in Figure 4, wherein, the wavelength (frequency) of the laser that the CML laser of the 1st laser emission element ~ the 180th laser emission element is launched can be as shown in table 1 below:
Table 1
| Laser emission element | The frequency (GHz) of the laser launched | The wavelength (nm) of the laser launched |
| 1st laser emission element | 195.90 | 1530.33 |
| 2nd laser emission element | 195.85 | 1530.72 |
| 3rd laser emission element | 195.80 | 1531.12 |
| ...... | ||
| 178th laser emission element | 184.60 | 1624.01 |
| 179th laser emission element | 184.55 | 1624.45 |
| 180th laser emission element | 184.50 | 1624.89 |
As can be seen from Table 1, between the laser that the CML laser of laser emission elements different in optical line terminal optical module OLT is launched, minimum frequency interval is 50GHz.
In addition, in the optical line terminal optical module OLT of the embodiment of the present invention, also can have at least one laser pick-off unit 202, in order to receive the uplink optical signal of specific wavelength, and send to switch after the light signal of reception is converted to the signal of telecommunication.Different laser pick-off unit 202 can receive, process the light signal of different wave length.Such as, can have 4 laser pick-off unit 202 in optical line terminal optical module, being respectively used to receive wavelength is the uplink optical signal of 1271nm, 1291nm, 1311nm and 1331nm.The circuit of laser pick-off unit 202 adopts structure conventional in existing passive optical-fiber network, and the circuit be well known to those skilled in the art, repeats no more herein.
The EPON applying above-mentioned optical line terminal optical module OLT adopts point-to-point mode to carry out Signal transmissions, its structural representation as shown in Figure 5, comprise: above-mentioned optical line terminal optical module OLT501, first wave division multiplexer WDM502, Second Wave division multiplexer WDM503, AWG(ArrayedWaveguide Grating, array waveguide grating) 504, at least one ONU optical module 505.Fig. 6 is the circuit diagram of EPON.
The laser that each laser emission element in optical line terminal optical module OLT501 is launched is coupled in optical fiber through a WDM502.
One WDM502 is connected by optical fiber with the 2nd WDM503, the laser launched by each laser emission element, transmits arrival the 2nd WDM503 after a WDM502 is coupled to optical fiber in a fiber.2nd WDM503 can by up, descending light signal separately.
AWG504 is connected by optical fiber with the 2nd WDM503, and after the light signal exported via the 2nd WDM503 enters into the uplink port of AWG504, the light signal of different wave length is exported by different downlink ports by AWG504 respectively.Each downlink port of AWG504 connects an ONU optical module 505 respectively.
An above-mentioned WDM, the function and structure of the 2nd WDM, AWG are well known to those skilled in the art, and introduce no longer in detail herein.
The number of ONU optical module 505 is corresponding to the number of laser emission element in OLT501.Such as, have the 1st laser emission element ~ the 180th laser emission element in OLT501, namely 180 laser emission elements provide 180 down channels; Then the number of ONU optical module 505 can reach 180.In point-to-point transmission mode, the corresponding ONU optical module of each laser emission element, the wavelength of the laser that the laser pick-off unit of ONU optical module receives is identical with the wavelength of the laser that the laser emission element corresponding to this ONU optical module is launched.The laser that each laser emission element of OLT501 is launched is input to optical fiber through a WDM502 coupling, and after the light splitting of described Optical Fiber Transmission and described AWG, the laser that each laser emission element is launched is input to the ONU optical module corresponding to this laser emission element.Particularly, the laser that laser emission element is launched is after point light action of AWG504, the ONU optical module corresponding with this laser emission element is outputted to from the port exporting respective wavelength laser, after the light signal of the specific wavelength of reception is converted to the signal of telecommunication by the laser pick-off unit of ONU optical module, the signal of telecommunication of conversion is outputted to ONU system equipment, and ONU system equipment processes the signal of telecommunication.
ONU optical module, after the signal of telecommunication that have received the transmission of ONU system equipment, is converted to light signal and exports.Particularly, the signal of telecommunication of reception, after the signal of telecommunication that have received the transmission of ONU system equipment, is converted to light signal and exports by the laser emission element of ONU optical module.The light signal that described ONU optical module exports is sent to described OLT through described AWG, optical fiber, a WDM.
The laser pick-off unit of described OLT receives the light signal of described ONU optical module transmission, and sends to described switch after the light signal of reception is converted to the signal of telecommunication.
The wavelength of the light signal that different ONU optical modules sends can be different, and such as, the wavelength of the light signal that certain ONU optical module exports can be one of 1271nm, 1291nm, 1311nm and 1331nm wavelength.The different light signals that each ONU optical module exports are transferred to the 2nd WDM through described AWG, after the coupling of the 2nd WDM, enter described optical fiber, carry out receiving and being converted to the signal of telecommunication in order to the laser pick-off unit receiving respective wavelength laser by described OLT through described optical fiber, a WDM.
Laser emission element in ONU optical module and laser pick-off unit, and adopt structure conventional in existing passive optical-fiber network, the circuit be well known to those skilled in the art, repeats no more herein.
In actual applications, an above-mentioned WDM502 can be built in (as shown in Figure 2) in OLT501 as WDM module 203, in order to the laser coupled of being launched by each laser emission element of OLT501 in optical fiber.
The spectrum of the laser of transmitting controls at below 0.2nm owing to adopting CML laser in the olt by the embodiment of the present invention, and then sufficient center wavelength accuracy can also be locked on ITU-T lattice point, thus can channel spacing be reduced, reached more channel is provided, be network system dilatation, improve the object of system bandwidth.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer read/write memory medium, as: ROM//RAM, magnetic disc, CD etc.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. an optical line terminal optical module, comprising: at least two laser emission elements;
Each laser emission element comprises and controls spectrum width at below 0.2nm, and radiative spectrum-stable locked mode is made the chirp management laser of the range of drift of centre wavelength between +/-0.02nm and CML laser and is used for driving the drive circuit of described CML laser on the wavelength lattice point of ITU-T; The signal of telecommunication that the drive circuit of described laser emission element sends in order to desampler, the signal of telecommunication according to receiving drives the CML laser in this laser emission element to carry out Laser emission;
Between the laser that the CML laser of different laser emission elements is launched, minimum frequency interval is equal to or greater than 50GHz.
2. optical module as claimed in claim 1, it is characterized in that, the number of described laser emission element is specially 180;
The wavelength of the laser that the CML laser of each laser emission element is launched is divided equally in C+L wave band, and between the laser that the CML laser of different laser emission elements is launched, minimum frequency interval is 50GHz.
3. optical module as claimed in claim 1 or 2, is characterized in that, also comprise: laser pick-off unit;
Described laser pick-off unit, in order to receive the light signal of specific wavelength, sends to described switch after the light signal of reception is converted to the signal of telecommunication.
4. optical module as claimed in claim 3, it is characterized in that, the number of described laser pick-off unit is 4, and 4 laser pick-off unit receive the light signal that wavelength is 1271nm, 1291nm, 1311nm and 1331nm respectively.
5. optical module as claimed in claim 4, is characterized in that, also comprise:
WDM module, for the laser coupled of being launched by each laser emission element in optical fiber.
6. an EPON, comprising: optical line terminal optical module OLT, first wave division multiplexer WDM, array waveguide grating AWG, at least one ONU optical module;
Wherein, described OLT comprises at least two laser emission elements, each laser emission element comprises and controls spectrum width at below 0.2nm, and radiative spectrum-stable locked mode is made the chirp management laser of the range of drift of centre wavelength between +/-0.02nm and CML laser and is used for driving the drive circuit of described CML laser on the wavelength lattice point of ITU-T; The signal of telecommunication that the drive circuit of described laser emission element sends in order to desampler, the signal of telecommunication according to receiving drives the CML laser in this laser emission element to carry out Laser emission; Wherein, between the laser that the CML laser of different laser emission elements is launched, minimum frequency interval is equal to or greater than 50GHz;
The laser that each laser emission element of described OLT is launched is input to optical fiber through a WDM coupling, and after the light splitting of described Optical Fiber Transmission and described AWG, the laser that each laser emission element is launched is input to the ONU optical module corresponding to this laser emission element.
7. optical-fiber network as claimed in claim 6, it is characterized in that, the number of described laser emission element is specially 180;
The wavelength of the laser that the CML laser of each laser emission element is launched is divided equally in C+L wave band, and between the laser that the CML laser of different laser emission elements is launched, minimum frequency interval is 50GHz.
8. optical-fiber network as claimed in claim 7, is characterized in that,
Described ONU optical module is also for after have received the signal of telecommunication that ONU system equipment sends, and the signal of telecommunication of reception is converted to light signal and exports, the light signal that described ONU optical module exports is sent to described OLT through described AWG, optical fiber, a WDM; And,
Described OLT also comprises laser pick-off unit, in order to receive the light signal that described ONU optical module sends, and sends to described switch after the light signal of reception is converted to the signal of telecommunication.
9. optical-fiber network as claimed in claim 8, is characterized in that, also comprise the 2nd WDM be connected between a WDM and described AWG; And
The number of described ONU optical module is at least four, and the wavelength of the light signal that described ONU optical module exports is one of following wavelength: 1271nm, 1291nm, 1311nm and 1331nm; The light signal that each ONU optical module exports through described AWG, and enters described optical fiber after the coupling of the 2nd WDM, is sent to described OLT through described optical fiber, a WDM;
The laser pick-off unit of described OLT is 4, respectively in order to receive the laser of 1271nm, 1291nm, 1311nm and 1331nm wavelength.
10. optical-fiber network as claimed in claim 8, it is characterized in that, a described WDM is the WDM module be built in described OLT.
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| WO2017000992A1 (en) * | 2015-06-30 | 2017-01-05 | Telecom Italia S.P.A. | Activation of an optical network unit in a multi-wavelength passive optical network |
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| CN1256820C (en) * | 2002-04-03 | 2006-05-17 | 中国科学技术大学 | Multi-wavelength locking device |
| CN100391139C (en) * | 2002-05-30 | 2008-05-28 | 中国科学技术大学 | Parallel multichunnel wavelength locking device |
| US7280721B2 (en) * | 2002-11-06 | 2007-10-09 | Azna Llc | Multi-ring resonator implementation of optical spectrum reshaper for chirp managed laser technology |
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