CN100454788C - Passive optical network - Google Patents
Passive optical network Download PDFInfo
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- CN100454788C CN100454788C CNB2004100902308A CN200410090230A CN100454788C CN 100454788 C CN100454788 C CN 100454788C CN B2004100902308 A CNB2004100902308 A CN B2004100902308A CN 200410090230 A CN200410090230 A CN 200410090230A CN 100454788 C CN100454788 C CN 100454788C
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Abstract
The present invention provides a passive optical network which comprises an optical line terminal, an optical branching device and an optical user side. The present invention is characterized in that the passive optical network also comprises an optical amplifier and a high-sensitivity optical detector, wherein one end of the optical amplifier is connected to the optical emission output end of the optical line terminal, and the other end is connected to the optical combining end of the optical branching device for amplifying optical signals; one end of the optical detector is connected to the optical receiving end of the optical line terminal, and the other end is connected to the optical combining end of the optical branching device for receiving the optical signals. The passive optical network also comprises a wave dividing and combining device of which one end is respectively connected with the optical amplifier and the high-sensitivity optical detector, and the other end is connected with the optical combining end of the optical branching device for inputting and outputting the optical signals in a coupling mode. The present invention is used for greatly increasing the number of optical branching paths so as to increase the number of customer acces of the passive optical network and reduce the average customer acces cost.
Description
Technical field
The present invention relates to passive optical network technique, relate in particular to a kind of EPON that can increase access customer number amount ability.
Background technology
PON (EPON) technology is that present and following light inserts very promising technology.FTTH (fiber-to-the-home), FTTB (Fiber-To-The-Building), FTTC (FTTC) etc. will adopt passive optical network technique in a large number.
Please refer to Fig. 1, EPON inserts signal from OLT (optical line terminal), distribute to each ONU/ONT (light user side) by ODN (optical branching device), user side ONU/ONT optionally receives the OLT data-signal, and each ONU/ONT sends signal in the time-sharing multiplex mode to OLT then.Optical branching device can be realized the function on light shunt and photosynthetic road, and it uses use amount and the active terminal quantity that has reduced optical fiber greatly, has reduced the cost of each user access network.
In theory, the branch way of optical branching device is many more, and on average each user's cost of access is just low more.But in fact, optical branching device when light branch way increases, will reduce each minute light path luminous power and each minute light path to the luminous power of optical line terminal, please refer to Fig. 2,0 is photosynthetic terminal among the figure, 1～N is a light branch terminal, and light is imported from 0 end, then from the output of 1～N end, light also can be exported from 0 end from the input of 1～N end.Along separate routes than specifying arbitrarily.For the optical branching device of dividing equally of usually molten fine technology, its input and output are inserted loss and are about:
10LgN+a(dB)；
Wherein, a=0.5～2dB,
When being N=16, insert loss=13～14dB.
By above-mentioned optical branching device principle as can be known, light divides way big more, the luminous power that each light user side and light terminal are received is just because optical loss becomes more little, when luminous power during less than the sensitivity of light-receiving, optical receiving end is receiving optical signals correctly, thereby the branch way quantity of optical branching device is restricted.
In order to improve the branch way of optical branching device, reduce the cost of user access network, prior art is often taked to use the high sensitivity photo-detector to come receiving optical signals at the ONU/ONT optical receiving end.
Please refer to Fig. 3, in order to increase the branch way of optical branching device, prior art often uses APD (light avalanche probe) to come receiving optical signals by the optical receiving end at the light user side.Because the sensitivity of APD light-receiving is far above the sensitivity (8～10db) of PIN (normal optical detector), consider 1 times of the every increase of optical branching device simultaneously, optical loss will increase by 3～4db, will be when using PIN so use behind the APD, increased about 8 times light quantity along separate routes.For example in the GPON system, when the access distance is 20km, can only support 32 the tunnel usually along separate routes,, make light branch way to reach more than 256 the tunnel by adopting APD.
The defective of prior art:
Though by make method can increase light branch way at optical receiving end with light avalanche probe APD, but this scheme need all will be used APD at each optical-fiber network user side, therefore network increases a large amount of APD use amounts, because the price of APD is expensive far away in the price of PIN, therefore the cost of whole system also becomes very expensive, according to preresearch estimates, behind the employing APD, each user's cost of access will increase by 500～700 yuan, therefore can not reach the purpose that reduces the average cost of access of user.
Summary of the invention
The object of the present invention is to provide a kind of passive optical network that can increase the access customer number amount effectively, this system can increase the ability of single optical line terminal access customer number amount, and overcome the big problem of cost that is produced when prior art increases the branch way of optical branching device, with real reduction optical-fiber network user's average cost of access.
In view of above-mentioned purpose, the invention provides a kind of like this EPON (PON), comprise optical line terminal (OLT), optical branching device (ODN), light user side (ONU/ONT), described EPON also comprises:
One image intensifer, an end are connected to the light emission output of described optical line terminal, and the other end is connected to the photosynthetic terminal of optical branching device, are used for the light transmission signal of optical line terminal is amplified;
One high sensitivity photo-detector, an end is connected to the receiving terminal of described optical line terminal, and an end is connected to the photosynthetic terminal of optical branching device, is used to receive the light user side to the optical line terminal uplink optical signal.
Above-mentioned EPON can also comprise a wave splitting/composing device, and an end connects described image intensifer and described high sensitivity photo-detector respectively, and the other end is connected with the photosynthetic terminal of described optical branching device, is used to the light signal that is coupled input, exports.
The beneficial effect that the present invention produces:
By in passive optical network, take rational Passive Optical Components configuration, between the physical connection of system's optical line terminal and optical distribution network, include image intensifer and high sensitivity photo-detector simultaneously, make that the access customer number amount ability of single optical line terminal strengthens in the passive optical network, solve in the prior art in the EPON light branch way and used the problem of bottleneck, thereby reduced the average cost of access of unique user effectively;
Simultaneously,, make both to be applicable to two fiber optic transmission systems, also be applicable to single fiber transmission system according to passive optical network structure of the present invention owing to adopted the wave splitting/composing device.
Description of drawings
Fig. 1 is the structural representation of EPON;
Fig. 2 is an optical branching device schematic diagram along separate routes;
Fig. 3 adopts the passive optical network structure schematic diagram of APD for prior art;
Fig. 4 is the structural representation according to EPON of the present invention;
Fig. 5 is the structural representation according to another kind of EPON of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is made further detailed description, should be appreciated that specific embodiment described herein only is used to explain the present invention, and be not used in qualification the present invention.
Realization thought of the present invention is based on a kind of rational optical device configuration, by in passive optical network, disposing image intensifer, high sensitivity photo-detector or comprising the device of finishing the two kinds of functions in front, thereby the number of users that makes an optical line terminal connect increases greatly, and therefore the cost of access that system shares on each user also reduces.
Please refer to Fig. 4, be the structural representation of EPON produced according to the present invention.A kind of EPON comprises optical line terminal, optical branching device and light user side, also comprises:
One image intensifer, be connected to the light emission output of optical line terminal, the use of image intensifer can send signal and amplify to the direct sunshine of optical line terminal, the gain of light that image intensifer provides makes light user side light receiving power under same branch way be improved, therefore can satisfy and under the condition of light-receiving minimum optical power, obtain more branch way ability, for example, optical line terminal laser direct sunshine transmitting power is generally-7～3dBm, optical output power can reach 17～22dBm after using EDFA, and optical power gain can reach 10～20dB;
One high sensitivity photo-detector is connected to the receiving terminal of described optical line terminal, is used to receive ONU/ONT to the OLT uplink optical signal.Described high sensitivity photo-detector can adopt APD, by using APD, can improve the sensitivity of optical receiving end, for instance, when 1.25Gb/s the data light signal receives, the receiving sensitivity of PIN detector is-24dBm, but the receiving sensitivity of APD detector is: about-35dBm, the utilization of APD has improved the luminous sensitivity ability about 10dB;
When EPON will be realized the single fiber transmission, please refer to Fig. 5, described EPON also comprises:
One multi-wavelength wave splitting/composing device, the branch port of multi-wavelength wave splitting/composing device respectively incoming light ray road terminal transmit and receive two wavelength signals, the compound end of multi-wavelength wave splitting/composing device comprises two wavelength signals that optical line terminal transmits and receives simultaneously, by the use of wave splitting/composing device, make the multiplexing transmission that in an optical fiber, can realize multipath light signal.
In above-mentioned passive optical network structure, adopt the gain of light＞10dB that image intensifer produced, adopting the gain of light of light avalanche probe is about 10dB, the gain of light that is both direction all is higher than 10dB, therefore, system can improve light ability along separate routes under optical line terminal same light reception.According to loss evaluation formula: 10LgN+a, when then optical branching device increases by 8 times of branch ways, will increase the 9dB loss.Therefore, COMPREHENSIVE CALCULATING, system can improve 8 times of branch ways, that is to say, originally the system that possessed 32 tunnel shunt abilities, can reach 256 tunnel shunt ability after adopting this programme, but whole network does not roll up the use amount of light avalanche probe, therefore reduced user's average cost of access greatly.
In the above-mentioned passive optical network, ONU/ONT end light-receiving employing PIN or APD are unrestricted, but adopt PIN more to help reducing the passive optical network cost.
In the system of above-mentioned passive light networking, described image intensifer can be placed on the light transmitting terminal of optical line terminal and the optional position between the optical branching device.
In the above-mentioned passive optical network, EDFA both can be placed in the optical network terminal when using, also can be placed in the optical branching device equipment, or even any possible position between the two.
The applied environment of above-mentioned passive optical network structure comprises the passive optical network of various transmission data formats and management communication mode, for example various EPONs such as ATM Passive Optical Network, BPON, EPON and GPON.
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 the claim scope of the present invention.
Claims (7)
1, a kind of EPON comprises optical line terminal, optical branching device and light user side, it is characterized in that also comprising:
One image intensifer, an end are connected to the light emission output of optical line terminal, and an end is connected to the photosynthetic terminal of optical branching device, are used for the light transmission signal of optical line terminal is amplified;
One high sensitivity photo-detector, an end is connected to the receiving terminal of described optical line terminal, and an end is connected to the photosynthetic terminal of optical branching device, is used to receive the light user side to the optical line terminal uplink optical signal.
2, EPON as claimed in claim 1, it is characterized in that: described EPON also comprises a wave splitting/composing device, one end connects described image intensifer and described high sensitivity photo-detector respectively, the other end is connected with the photosynthetic terminal of described optical branching device, is used to the light signal that is coupled input, exports.
3, EPON as claimed in claim 1 or 2 is characterized in that: described image intensifer is semiconductor optical amplifier or PDFA Praseodymium Doped Fiber Amplifier or erbium-doped fiber amplifier.
4, EPON as claimed in claim 1 or 2 is characterized in that: described high sensitivity photo-detector is a light avalanche probe.
5, EPON as claimed in claim 1 or 2 is characterized in that: the optical signal receiver of described smooth user side is photodiode receiver or high sensitivity photo-detector.
6, EPON as claimed in claim 1 is characterized in that: described image intensifer can be arranged in the described optical line terminal equipment or in the described optical branching device equipment or any possible position between the two.
7, EPON as claimed in claim 1 is characterized in that: described EPON can be applied to the passive optical network of various transmission data formats and management communication mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100902308A CN100454788C (en) | 2004-10-27 | 2004-10-27 | Passive optical network |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100902308A CN100454788C (en) | 2004-10-27 | 2004-10-27 | Passive optical network |
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| CN1767416A CN1767416A (en) | 2006-05-03 |
| CN100454788C true CN100454788C (en) | 2009-01-21 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080267625A1 (en) * | 2007-04-30 | 2008-10-30 | Futurewei Technologies, Inc. | Multi-Rate Multi-Wavelength Optical Burst Detector |
| CN101938676B (en) | 2009-06-29 | 2014-11-05 | 中兴通讯股份有限公司 | Ethernet passive optical network system and optical power budget method thereof |
| CN102104814B (en) * | 2011-03-14 | 2014-10-22 | 青岛海信宽带多媒体技术有限公司 | Passive optical network |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1179245A (en) * | 1995-03-24 | 1998-04-15 | 英国电讯有限公司 | Optical network |
| US20020039214A1 (en) * | 2000-10-03 | 2002-04-04 | Alex Ruan | Dynamic passive optical network (PON) using a distributed optical cross connect and dense wavelength division multiplexing |
| US6597482B1 (en) * | 1998-07-23 | 2003-07-22 | Korea Advanced Institute Of Science And Technology | Multiplexing/demultiplexing apparatus for wavelength division multiplexed system and wavelength division multiplexed passive optical subscriber networks using the same apparatus |
| EP1439645A2 (en) * | 2003-01-15 | 2004-07-21 | Samsung Electronics Co., Ltd. | Wavelength-division-multiplexed optical source and passive optical network system employing the same |
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- 2004-10-27 CN CNB2004100902308A patent/CN100454788C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1179245A (en) * | 1995-03-24 | 1998-04-15 | 英国电讯有限公司 | Optical network |
| US6597482B1 (en) * | 1998-07-23 | 2003-07-22 | Korea Advanced Institute Of Science And Technology | Multiplexing/demultiplexing apparatus for wavelength division multiplexed system and wavelength division multiplexed passive optical subscriber networks using the same apparatus |
| US20020039214A1 (en) * | 2000-10-03 | 2002-04-04 | Alex Ruan | Dynamic passive optical network (PON) using a distributed optical cross connect and dense wavelength division multiplexing |
| EP1439645A2 (en) * | 2003-01-15 | 2004-07-21 | Samsung Electronics Co., Ltd. | Wavelength-division-multiplexed optical source and passive optical network system employing the same |
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