CN1478336A - System and method for communicating optical signals between data service provider and subscribers - Google Patents

System and method for communicating optical signals between data service provider and subscribers Download PDF

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Publication number
CN1478336A
CN1478336A CNA018199577A CN01819957A CN1478336A CN 1478336 A CN1478336 A CN 1478336A CN A018199577 A CNA018199577 A CN A018199577A CN 01819957 A CN01819957 A CN 01819957A CN 1478336 A CN1478336 A CN 1478336A
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China
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optical
transceiver node
laser transceiver
user
data
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CNA018199577A
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CN1265568C (en
Inventor
詹姆斯・O・法默
詹姆斯·O·法默
J・肯尼
约翰·J·肯尼
克・W・奎恩
帕特里克·W·奎恩
・A・泰
托马斯·A·泰
F・怀特里斯
保罗·F·怀特里斯
尔・A・维拉
伊曼纽尔·A·维拉
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Wave7 Optics Inc
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Wave7 Optics Inc
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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
    • H04B10/40—Transceivers

Abstract

An optical fiber network can include an outdoor laser transceiver node that can be positioned in close proximity to the subscribers of an optical fiber network. The outdoor laser transceiver node does not require active cooling and heating devices that control the temperature surrounding the laser transceiver node. The laser transceiver node can adjust a subscriber's bandwidth on a subscription basis or on an as-needed basis. The laser transceiver node can also offer data bandwidth to the subscriber in preassigned increments. Additionally, the laser transceiver node lends itself to efficient upgrading that can be performed entirely on the network side. The laser transceiver node can also provide high speed symmetrical data transmission. Further, the laser transceiver node can utilize off-the-shelf hardware to generate optical signals such as Fabry-Perot (F-P) laser transmitters, distributed feed back lasers (DFB), or vertical cavity surface emitting lasers (VCSELs).

Description

Be used between data service provider and user, transmitting the system and method for light signal
Priority request to provisional application
The present invention requires priority to following temporary patent application: application on October 4th, 2000, distribute U.S. Patent Application Serial Number No.60/237, and 894, title is the temporary patent application of " system of video, speech and data service is provided by optical cable "; Application on October 26th, 2000 distributes U.S. Patent Application Serial Number No.60/244, and 052, title is the temporary patent application of " system of video, speech and data service is provided by optical cable-Part 2 "; Application on December 28th, 2000 distributes U.S. Patent Application Serial Number No.60/258, and 837, title is the temporary patent application of " system of video, speech and data service is provided by optical cable-Part 3 "; Application on October 27th, 2000 distributes U.S. Patent Application Serial Number No.60/243, and 978, title is the temporary patent application of " agreement of speech and data service is provided by optical cable "; And application on May 7 calendar year 2001, distribute U.S. Patent Application Serial Number No.60/289,112, title is the temporary patent application of " agreement of speech and data service is provided by optical cable-Part 2 ", and the whole contents of these temporary patent applications comprises as a reference at this.
Technical field
The present invention relates to video, speech and data communication.The invention particularly relates to a kind of system and method that is used between data service provider and one or more user, transmitting light signal.
Background technology
More and more rely on communication network and transmit more polynary data,, make more and more higher the demand of bandwidth as speech and video traffic.For solving this demand to bandwidth, communication network more and more depends on optical fiber and transmits this multivariate data.The communication network that the traditional communication architecture of use coaxial cable is just progressively only comprised optical cable replaces.The advantage that optical fiber substitutes coaxial cable is can transmit more a large amount of information on optical fiber.
Optical fiber (FTTH) optic network architecture of registering one's residence has become the dream of many data service providers, because the above-mentioned capacity of optical fiber makes the mixing energy of any high speed business be sent to the business and consumer by highly reliable network.Relevant with FTTH is that optical fiber is gone into enterprise (FTTB).Because FTTH and FTTB system have improved signal quality, reduced maintenance cost and prolonged hardware longevity, so FTTH and FTTB architecture become desirable architecture.And in the past, we think that the cost of FTTH and FTTB architecture is too high.But at present, because to the demand height of bandwidth and to improving the current research and the exploitation of optic network, FTTH and FTTB come true.
A kind of FTTH architecture example of being introduced by industry is passive optical network (PON).Though the PON architecture can provide Full Fibre Network really, it still has many defectives makes this system in fact can't realize.A defective of PON architecture is, because light signal becomes too weak and can divided number of times before can't using limited at signal, too many optical cable must send from head end or data, services hub.Another defective is attributable to the sourceless characteristic of PON network.In other words, owing between data, services hub and user, do not dispose the source signal source, therefore fall into usually within the scope of 10～20km in attainable ultimate range between data, services hub and the user.
Another major defect of PON architecture is the equipment cost height that the data, services hub needs.For example, the full service Access Network (FSAN) of ATM(Asynchronous Transfer Mode) agreement is used in many PON architecture supports.For supporting this agreement, need quite complicated and expensive equipment.
Except data, services hub cost height, conventional PON architecture also is not suitable for effective upgrading.That is to say that routine or conventional P ON architecture are forced by interpolation optical fiber and router port and reconfigured physical network so that improve the data transfer rate of network.
Data transfer rate in downstream and upstream direction is another defective of PON architecture.Conventional PON architecture is supported speed up to 622Mb/s in the downstream direction usually, and only supports the speed of the fastest 155Mb/s in upstream direction.This unbalanced traffic rate between upstream and downstream communication direction does not wish to occur, and usually it is referred to as asymmetric bandwidth.This asymmetric bandwidth is to being provided with a low upper limit or low threshold from the user to the transmissible amount of information of data, services hub.This asymmetric bandwidth is the required high result of optics cost.
For overcoming asymmetric bandwidth problem and the limited problem of distance between user and data, services hub, in industrial conventional hybrid fiber (FTTH)/hybrid fiber-coaxial cable (HFC) architecture of registering one's residence of having recommended.HFC is the selected architectures of many cable television systems at present.In this FTTH/HFC architecture, between data, services hub and user, be provided with the source signal source.Usually in this architecture, the active signal source comprises router.This conventional router has a plurality of FPDP, is designed for to support each different user.Specifically, conventional router uses a port to each user.Each FPDP of router connects an optical fiber, and this optical fiber links to each other with the user again.With being connected of this conventional FTTH/HFC architecture optical fiber there is strong dependence between FPDP and the optical fiber.Should point out that term " last mile " and " first mile " are the general terms of the last part that is used to describe the optical networking that is connected the user.
Except the optical cable quantity that is derived from router is many, the FTTH/HFC architecture requires radiofrequency signal along traditional coaxial cable transmission.Owing to use coaxial cable, between user and data, services hub, need a plurality of radio frequencies (RF) amplifier.For example, in coaxial cable type system, per 1～3 kilometer needs radio frequency amplifier usually.Owing in the FTTH/HFC architecture, have two independent with different networks, in this architecture, use coaxial cable to increase the whole cost of system.In other words, owing to also need diverse waveguide (combination of coaxial cable and optical fiber) to support this two kinds of different systems except needs are electric with light device, therefore, FTTH/HFC architecture maintenance cost is very high.In brief, the FTTH/HFC architecture only is to have made up optic network and electrical network, and these two kinds of separate operations of network.
Another defective of FTTH/HFC architecture is the active signal source between data, services hub and user, is referred to as router usually, need occupy the protection environment of big quantity space.That is to say that the conventional router of FTTH/HFC architecture needs the environmental cabinet, it must keep router and relevant device in optimum temperature.For keeping this optimum temperature, the environmental cabinet will comprise active temperature control device usually, be used for heating up and the cooling environmental cabinet.
In brief, the conventional router of FTTH/HFC architecture can only be worked under normal room temperature.Therefore the active cooling and the intensification equipment that require the expenditure of energy are so that keep this working temperature in all types of geographic areas with under all types of weathers.
Another kind of conventional hybrid fiber/ coax, HFC (HFC) architecture is different with the FTTH/HFC architecture of using two kinds of independent communication networks, it uses the active signal source between data, services hub and user, this active signal source does not need the temperature control environmental cabinet.Yet this active signal source that disposes between user and data, services hub can only provide the opto-electronic conversion of information signal.That is to say that in the HFC architecture, the active signal source that disposes is converted to the signal of telecommunication with downstream optical signals between user and data, services hub, and be light signal the upstream electrical signal conversion.Conventional H FC architecture relies on coaxial cable and supports all signals in last mile or all signals of hfc plant.Therefore, conventional H FC architecture and FTTH/HFC architecture are similar, also need a plurality of radio frequency amplifiers in coaxial cable one side of network.
Another defective of conventional H FC architecture is the data, services hub, needs a plurality of communication equipments to support that data-signal transmits between active signal source and data, services hub along optical fiber at this.For example, conventional H FC architecture is usually by using the equipment supporting telephone business that generally is referred to as Host Digital Terminal (HDT).HDT can be included in the radio frequency interface of cable one side, and with the interface of telephone switch, or with the interface of the cable that transmits signals to the opposite side switch.
In addition, the data, services hub of conventional H FC architecture can comprise cable modem terminal system (CMTS) in addition.This system provides low layer format and transfer function for the data of transmitting between data, services hub and the user.But CMTS system way traffic this means that it can the descending user of transmitting a signal to and receive the signal that sends from user uplink.
Except CMTS, the conventional H FC architecture of data, services hub comprises some modulators usually, wherein can comprise the micro-television transmitter.Each modulator can be transformed into allocated channel (frequency) from the vision signal that satellite receives to send to the user.Except modulator, also use a whole set of TV signal of signal processor and miscellaneous equipment collection to send to the user.Usually in conventional H FC architecture, can exist 78 or how this modulator or processor and their support equipment with service analog TV antenna array.In addition, also often use similar devices service digits video antenna battle array.
Another defective of conventional H FC architecture is from the use of CMTS.Be similar to passive optical network discussed above (PON), CMTS can not support symmetric bandwidth.That is to say that owing to use by cable service interface transmission data standard (DOCSIS), the bandwidth of conventional H FC architecture is asymmetric usually.The essence of DOCSIS standard is the upstream bandwidth that its limited subscriber can be used.This may be the band-limited direct result of upstream that can use at HFC equipment.This feature sends more multivariate data to needs, is used for the bandwidth intensive business, as attribution server, or is undesirable by the user of internet exchange audio file.
In another remodeling of conventional H FC architecture, CMTS can be the part in the active signal source that disposes between user and data, services hub.Though this remodeling of conventional H FC architecture makes the active signal source can carry out some and handles that the output in active signal source still is radio-frequency (RF) energy in this architecture, and transmits along coaxial cable.
Therefore, need a kind of system and method that is used for transmitting light signal between data service provider and user in the prior art, this system and method need not use coaxial cable and support that data-signal transmits necessary related hardware and software along coaxial cable.Also need a kind of system and method that is used between data service provider and user, transmitting light signal of supporting the transmission of high speed symmetric data in the prior art.In other words, need a kind of energy to come and go the Full Fibre Network and the method for the descending and uplink identical bit of the network user in the prior art.In addition, also need in the prior art a kind ofly can serve a large number of users, can reduce optical network system and method simultaneously at the number of connection of data, services hub.
Also need a kind of active signal source in the prior art, this active signal source can be configured between data, services hub and the user, can be designed for and bear outdoor environmental conditions, and can be designed for and be suspended on the twisted wire, or be installed in the pedestal that is similar to conventional wired TV equipment of in last mile of communication network, placing.In addition, also need a kind of being used for to receive gigabit (gigabit) or Fast Ethernet communication at least from the data, services hub in the prior art with optical form, or with the wide system and method for cutting apart or being assigned as the assign group of predetermined quantity of this light belt.Also need in the prior art a kind of can be additional or the system and method for compression bandwidth based on the demand assignment of one or more users in the optic network.Also need a kind of being suitable in the prior art at the whole effectively optical network system of upgrading of carrying out of network one side.In other words, need in the prior art a kind ofly to allow upgrading hardware to occur in the service hub and between the active signal source that disposes between data hub and the user and the optical network system of interior location.
Summary of the invention
The present invention relates generally to a kind of system and method that is used for effectively transmitting data and broadcast singal by fiber optic network.Specifically, the present invention relates generally to a kind of optic network architecture, it comprises the position very near the user's of optical networking outdoor laser transceiver or processing node.For example, the outdoor laser transceiver node can be designed for bears outdoor environmental conditions, and can be designed for and be suspended on the twisted wire, perhaps is installed in the pedestal that is similar to conventional wired TV equipment of placement in " last mile " of network.
The outdoor laser transceiver node is different with the conventional router that disposes between user's optical interface and data, services hub, and it does not need active cooling and intensification equipment to control laser transceiver node temperature on every side.In addition, the laser transceiver node can be worked in wide temperature range.Because the laser transceiver node does not need active temperature control device, so the laser transceiver node is suitable for the miniature electric encapsulation volume, common environmental cabinet less than conventional router.
Opposite with wired TV equipment of routine or conventional optical processing node, the laser transceiver node can receive gigabit (gigabit) or Fast Ethernet communication at least from the data, services hub with the light form, and with the wide assign group of cutting apart or being assigned as predetermined quantity of this light belt.In one exemplary embodiment, the laser transceiver node can be with the wide assign group that comprises at least 16 users of at least 6 groups that is divided into of this light belt.
The suitable agreement of laser transceiver node utilization can be added or compression bandwidth based on one or more users' demand assignment.That is to say that the laser transceiver node can be based on the bandwidth of preengaging or adjust based on needs the user.The laser transceiver node can be that the user provides data bandwidth with preassigned increment.For example, the laser transceiver node can be with 1,2,5,10,20,50,100,200 and the unit of 450Mb/s provide specific user or user to organize bandwidth.
Except providing bandwidth with preassigned increment, the laser transceiver node is suitable for upgrading whole the execution effectively of network one side.In other words, the hardware that upgrading constitutes the laser transceiver node can occur between data, services hub (as, head end) and the laser transceiver node self and inner position.This means at upgrading laser transceiver node or data, services hub or upgrade simultaneously that user's one side of network can integral body remain unchanged during the two.
The laser transceiver node can also provide the transmission of high speed symmetric data.In other words, the laser transceiver node can be from the descending and uplink identical bit of the network user.In addition, the laser transceiver node also can be served a large number of users in the number of connection that reduces the data, services hub.
The flexibility of laser transceiver node and diversity are attributable at least some parts.The laser transceiver node can comprise the optical tapoff parting that is connected with one or more tap multiplexers by equipment.The optical tapoff parting can be managed and being connected of data, services hub light signal by equipment, and can according to each tap multiplexer route of modulated laser transmitter cut apart or distribute data service hub signal so that be specific light tap generation light signal.That is to say that give the conventional router of unique user different with distributing single port, the optical tapoff parting can distribute a plurality of users to give single port by equipment.Specifically, can serve many group users with each tap multiplexer that the optical tapoff parting is connected by the port of equipment.Each tap router energy modulated laser transmitter is so that provide downstream optical signals for the preassigned user who is connected with the optical tapoff head organizes.The user utilizes user's optical interface to receive downstream optical signals from these optical tapoff heads.
The optical tapoff parting can determine that by equipment which tap multiplexer will receive the downstream signal of telecommunication, or discerns which sends upstream signal in these a plurality of optical tapoff heads.But the optical tapoff parting is by equipment formatted data and realize the required agreement (below will discuss) that transmits and receive data from each user who is connected with the corresponding light tap also.The optical tapoff parting comprises computer or hardwired device by equipment, is implemented as and distributes to the program of user's group communication definition agreement of single port.These single ports are connected (below will go through) with corresponding tap multiplexer.
The laser transceiver node comprises that also the existing hardware of using is to generate light signal.For example, the laser transceiver node can comprise one or more Fabry-Perots (F-P) laser transmitter, distributed feedback laser (DFB), or vertical cavity surface emitting laser (VCSEL).The laser transceiver node also can support to be derived from the unidirectional light signal of data, services hub.Laser transceiver node unidirectional light signal capable of being combined with downstream optical signals so that single fiber waveguide can be connected laser transceiver node and relative users.Unidirectional light signal can comprise broadcast video or other similar rf modulations light signal.
The laser transceiver node is a part of the present invention.The present invention also comprises an effective coupler between laser transceiver node and corresponding user's optical interface, be referred to as the optical tapoff head.This optical tapoff head can be cut apart light signal and simplicity of design between a plurality of users.For example, each optical tapoff head can comprise an optical branching device, but the one or more users of its feed.But optical tapoff head cascade or connect from the laser transceiver node with hub-and-spoke configuration.But the optical tapoff head also route signal to the corresponding light tap under other optical tapoff head of line correlation.The optical tapoff head also can connect a little light waveguide, so that the high concentration of fiber waveguide can not occur at any specific laser transceiver node.In other words, the optical tapoff head can be a bit connecting the fiber waveguide of predetermined quantity away from certain of laser transceiver node, so that avoid occurring at the laser transceiver node high concentration of fiber waveguide.
As noted above, optical tapoff head and laser transceiver node are a part of the present invention, and system of the present invention comprises the optical tapoff head, the laser transceiver node, the data, services hub, user's optical interface, and the fiber waveguide that between optical tapoff head and laser transceiver node, connects.
Description of drawings
Fig. 1 is the functional block diagram according to some core component of exemplary optical network architecture of the present invention;
Fig. 2 is the functional block diagram of exemplary optical network architecture of the present invention;
Fig. 3 is the functional block diagram of example data service hub of the present invention;
Fig. 4 is the functional block diagram according to exemplary outdoor laser transceiver node of the present invention;
Fig. 5 is according to one exemplary embodiment of the present invention, the functional block diagram of the optical tapoff head that links to each other with user interface by single fiber waveguide;
Fig. 6 is that wherein upstream optical signals and downstream optical signals are along independently fiber waveguide transmission according to the functional block diagram of the example data service hub of an optional exemplary embodiment of the present invention;
Fig. 7 is a kind of functional block diagram of exemplary outdoor laser transceiver node, and except the one way signal that can mix with downstream optical signals, it can also be accepted along the upstream of independent light waveguide and downstream optical signals.
Fig. 8 is the functional block diagram of another kind of exemplary outdoor laser transceiver node, and except a plurality of fiber waveguides of transfer of unidirectional signal, it can be received in the light signal that transmits in the independently uplink and downlink fiber waveguide.
Fig. 9 is the functional block diagram of the exemplary embodiment of another kind of data, services hub, and wherein one way signal and the downstream optical signals such as video or radiofrequency signal makes up;
Figure 10 is the functional block diagram of another kind of exemplary outdoor laser transceiver node, and except the one way signal of similar radio frequency transmission or video data, it can also handle the combination downstream signal that comprises downstream optical signals;
Figure 11 is the functional block diagram of another kind of exemplary outdoor laser transceiver node, and it uses double receiver-transmitter between tap multiplexer and corresponding user's group;
Figure 12 is the functional block diagram of another kind of exemplary outdoor laser transceiver node, and it is included in the optical tapoff head of laser transceiver node self internal configurations;
Figure 13 is the logical flow chart that utilizes the illustrative methods of the unidirectional and bidirectional optical signal of laser transceiver node processing of the present invention;
Figure 14 is the logical flow chart that utilizes according to the example process of laser transceiver node processing downstream optical signals of the present invention;
Figure 15 is the logical flow chart that utilizes according to the example process of exemplary laser transceiver node processing upstream optical signals of the present invention;
Figure 16 utilizes the logical flow chart of handling unidirectional and bidirectional optical signal according to optical tapoff head of the present invention;
Figure 17 utilizes unidirectional light signal of user interface process according to the present invention and and the logical flow chart of bidirectional optical signal.
The specific embodiment mode
The present invention can be embodied in the combination of hardware or the software or the hardware and software of optic network internal configurations.The present invention can be included in the laser transceiver node that disposes between data, services hub and the user, and it can add or compression bandwidth based on one or more users' demand assignment.The present invention can the light form come and go data, services hub support gigabit (gigabit) or Fast Ethernet communication, and with the wide assign group of cutting apart or being assigned as predetermined quantity of this light belt.It is that the user provides bandwidth that the present invention allows with preassigned increment.Flexibility of the present invention and diversity are attributable to some parts.
Laser transceiver node of the present invention can comprise the optical tapoff parting that is connected with one or more optical tapoff head routers by equipment.The optical tapoff parting can distribute a plurality of users to give single port to receive downstream optical signals from the data, services hub by equipment.Laser transceiver node of the present invention can comprise the existing hardware of using to generate light signal.For example, laser transceiver node of the present invention can comprise one or more Fabry-Perots (F-P) laser, distributed feedback laser or vertical cavity surface emitting laser (VCSEL) in transmitter.The present invention also can comprise effective coupler between laser transceiver node and relative users optical interface, as the optical tapoff head.
The optical tapoff head can be cut apart light signal between a plurality of users, and its simplicity of design.The optical tapoff head is a bit connecting the fiber waveguide of limited quantity away from certain of laser transceiver node, so that avoid occurring at the laser transceiver node high concentration of fiber waveguide.In a further exemplary embodiment, can be at laser transceiver intra-node configuration optical tapoff head of the present invention.
With reference now to accompanying drawing,, same reference numerals is represented similar elements in the wherein whole accompanying drawing, various details various aspects and schematic operational environment.
Fig. 1 is the functional block diagram according to exemplary optical network architecture 100 of the present invention.Exemplary optical network architecture 100 comprises data, services hub 110, and it links to each other with outdoor laser transceiver node 120.Laser transceiver node 120 links to each other with optical tapoff head 130.Optical tapoff head 130 can connect a plurality of user's optical interfaces 140.Between each parts of exemplary optical network architecture 100, a plurality of fiber waveguides are arranged, as fiber waveguide 150,160,170 and 180.Fiber waveguide 150-180 illustrates by arrow, wherein the schematic flow direction of the head of arrow signal data between each parts of this schematic optic network architecture 100.Though only illustrated single laser transceiver node 120 among Fig. 1, single optical tapoff head 130 and unique user optical interface 140, but from the corresponding description of Fig. 2, can find out with it, can use a plurality of laser transceiver nodes 120, optical tapoff head 130 and user's optical interface 140, and do not depart from scope and spirit of the present invention.Usually in many exemplary embodiments of the present invention, there are a plurality of user's optical interfaces 140 to link to each other with one or more optical tapoff heads 130.
Outdoor laser transceiver node 120 can be added or compression bandwidth based on the one or more users' that use user's optical interface 140 demand assignment.Outdoor laser transceiver node 120 can be designed for bears outdoor environmental conditions, and can be designed for be suspended on the twisted wire or be installed on pedestal or " hard hole " in.The outdoor laser transceiver node can work in-40 ℃ in+60 ℃ temperature range.Laser transceiver node 120 can work in this temperature range by utilizing not catabiotic passive cooling system.
Outdoor laser transceiver node 120 is different from the conventional router of configuration between user's optical interface 140 and data, services hub 110, and it does not need active cooling and intensification equipment to control laser transceiver node 120 temperature on every side.The present invention attempts at data, services hub 110, rather than places more decision-making electronic equipments at laser transceiver node 120.The electronic equipment height that common these decision-making electronic equipment sizes are very big and heat ratio that produced is placed at laser transceiver intranodal of the present invention.Because laser transceiver node 120 do not need active temperature control device, so laser transceiver node 120 is suitable for the miniature electric encapsulation volume, and is littler than the environmental cabinet of conventional router usually.Go through the concrete structure of the parts of forming laser transceiver node 120 below with reference to Fig. 4,7,8,10,11 and 12.
In one exemplary embodiment of the present invention, three main line fiber waveguides 160,170 and 180 (can comprise optical fiber) can be from data, services hub 110 transmitting optical signals to outdoor laser transceiver node 120.Should point out that the term of Shi Yonging " fiber waveguide " can be applicable to optical fiber, planar-light guide circuit and fiber optic tap and other similar fiber waveguide in this application.
First fiber waveguide 160 can be transmitted broadcast video and other signal.These signals can be by the transmission of traditional cable TV form, and wherein broadcast singal is modulated onto on the carrier wave, and carrier wave is the optical sender (not shown) in the modulating data service hub 110 again.Second fiber waveguide 170 can be transmitted downstream target service such as data and telephone service to be sent to one or more user's optical interfaces 140.Except the specific light signal of transmission user, but the also transmitting internet protocol broadcast grouping of second fiber waveguide 170, and this it will be appreciated by those skilled in the art that.
In an illustrative examples, the 3rd fiber waveguide 180 can downlink to data, services hub 110 from outdoor laser transceiver node 120 with data-signal.Light signal along 180 transmission of the 3rd fiber waveguide also can comprise data and the telephone service that receives from one or more users.Be similar to second fiber waveguide, 170, the three fiber waveguides 180 and also can transmit the IP broadcast grouping, this it will be appreciated by those skilled in the art that.
Illustrated the 3rd or upstream fiber waveguide 180 with dotted line among the figure, be used to show that it only is the part according to one exemplary embodiment of the present invention.In other words, can remove the 3rd fiber waveguide 180.In another exemplary embodiment, second fiber waveguide 170 is at upstream and the equal energy of downstream direction transmitting optical signal, and this can be by the double-head arrow signal of describing second fiber waveguide 170.In this exemplary embodiment of second fiber waveguide, 170 transmission bidirectional optical signals, only need two fiber waveguides 160,170 to support that light signal transmits between data server hub 110 and outdoor laser transceiver node 120.(not shown) in another exemplary embodiment, single fiber waveguide can be the unique links between data, services hub 110 and the laser transceiver node 120.In the embodiment of this single fiber waveguide, there are three different wave lengths to can be used for upstream and downstream signal.Perhaps, can modulate on bi-directional data to a wavelength.
In one exemplary embodiment, optical tapoff head 130 can comprise one No. 8 optical branching device.This means that the optical tapoff head 130 that comprises No. 8 optical branching devices can be divided into downstream optical signals 8 the tunnel to serve 8 different user's optical interfaces 140.In upstream direction, optical tapoff head 130 light signals that receive from 8 user's optical interfaces 140 capable of being combined.
In another exemplary embodiment, optical tapoff head 130 can comprise one No. 4 splitter to serve 4 user's optical interfaces 140.And in a further exemplary embodiment, optical tapoff head 130 can comprise one No. 4 splitter in addition, this No. 4 splitter also is to penetrate (pass-through) tap, this means the part optical signals that can be extracted in 130 receptions of optical tapoff head to serve No. 4 splitters that wherein comprise, the remaining light energy of downlink transfer arrives another optical tapoff head or another user's optical interface 140 in addition simultaneously.The present invention is not limited to 4 road and No. 8 optical branching devices.Have and be less than or do not exceed scope of the present invention more than 4 road or 8 tunnel along separate routes other optical tapoff heads.
With reference now to Fig. 2,, Fig. 2 is the functional block diagram that comprises in addition corresponding to the exemplary optical network architecture 100 of the user grouping 200 of corresponding outdoor laser transceiver node 120.Fig. 2 has illustrated the diversity of exemplary optical network architecture 100, the wherein minimum number of the fiber waveguide 150 that connects between outdoor laser transceiver node 120 and optical tapoff head 130.Fig. 2 has also illustrated to utilize the diversity of the user grouping 200 that optical tapoff head 130 realizes.
Each optical tapoff head 130 can comprise an optical branching device.Optical tapoff head 130 allows a plurality of user's optical interfaces 140 to connect the single fiber waveguide 150 that links to each other with outdoor laser transceiver node 120.In one exemplary embodiment, the outer laser transceiver node 120 of 6 optical fiber 150 junction chambers of design.By using optical tapoff head 130, can distribute 16 users to give every the optical fiber 150 that links to each other with outdoor laser transceiver node 120.
In another exemplary embodiment, but 12 outer laser transceiver nodes 120 of optical fiber 150 junction chambers distribute 8 user's optical interfaces 140 to give every optical fiber 150 simultaneously.It should be appreciated by those skilled in the art that, can change the quantity of user's optical interface 140 of distributing to the particular waveguide 150 that between outdoor laser transceiver node 120 and user's optical interface 140, is connected (by optical tapoff head 130), and not depart from scope and spirit of the present invention.In addition, those skilled in the art recognizes that the actual quantity of distributing to user's optical interface 140 of specific optical cable depends on watt level available on particular fiber 150.
As what describe in user grouping 200, it all is possible that many users of being used to provide the configuration of communication service.For example, though optical tapoff head 130 ACan pass through user's optical interface 140 ANConnect user's optical interface 140 A1With outdoor laser transceiver node 120, but optical tapoff head 130 AAlso can connect such as optical tapoff head 130 ANOther optical tapoff head 130 and laser transceiver node 120.Except the combination of optical tapoff head 130 with user's optical interface 140, optical tapoff head 130 is hard-core with the combination of other optical tapoff head 130.Utilize optical tapoff head 130 can be reduced in the closeness of the distributed fiber waveguide 150 of laser transceiver node 120.In addition, also can reduce the service-user 200 required optical fiber total amounts of dividing into groups.
Utilize active laser transceiver node 120 of the present invention, the distance between laser transceiver node 120 and the data, services hub 110 can comprise the scope between 0～80km.Yet the present invention is not limited to this scope.It will be apparent to one skilled in the art that the various of some equipment by selecting to form system of the present invention now can expand this scope with parts.
Other configuration that it will be apparent to one skilled in the art that the fiber waveguide of configuration between data, services hub 110 and outdoor laser transceiver node 120 does not exceed scope of the present invention.Because the bi-directional capability of fiber waveguide can change the quantity of optic waveguides and the directed flow of configuration between data, services hub 110 and outdoor laser transceiver node 120, and not depart from scope and spirit of the present invention.
With reference now to Fig. 3,, this functional block diagram has illustrated example data of the present invention to serve hub 110.Example data service hub 110 shown in Figure 3 is designed for two main line optical waveguide systems.That is to say that this data, services hub 110 of Fig. 3 is designed for along first fiber waveguide 160 and second fiber waveguide 170 and comes and goes outdoor laser transceiver node 120 transmission and receiving optical signals.Utilize this exemplary embodiment, second fiber waveguide 170 can be supported bidirectional traffic.Just do not need the 3rd fiber waveguide 180 discussed above in this way.
Data, services hub 110 can comprise the one or more modulators 310,315 that are designed for support television broadcasting service.These one or more modulators 310,315 can be analog or digital type modulators.In one exemplary embodiment, in data, services hub 110, may there be at least 78 modulators.It will be apparent to one skilled in the art that the quantity that can change modulator 310,315 and do not depart from scope and spirit of the present invention.
Signal from modulator 310,315 is combined at mixer 320, and offers optical sender 325, and the radiofrequency signal that is generated by modulator 310,315 is converted into the light form at optical sender 325.
Optical sender 325 can comprise a kind of in Fabry-Perot (F-P) laser transmitter, distributed feedback laser (DFB) or the vertical cavity surface emitting laser (VCSEL).Yet, can be the optical sender of other type also, and not exceed scope of the present invention.Utilize above-mentioned optical sender 325, data, services hub 110 is suitable for effective upgrading by utilizing now with hardware generation light signal.
The light signal (being commonly referred to unidirectional light signal) that is generated by optical sender is transferred to the amplifier 330 such as the fiber amplifier that mixes up erbium (EDFA), is exaggerated at this unidirectional light signal.Unidirectional light signal through amplifying then is output data, services hub 110 by the one way signal output port 335 that links to each other with one or more first fiber waveguides 160.
One way signal output port 335 links to each other with one or more first fiber waveguides 160, arrives corresponding laser transceiver node 120 to support the unidirectional light signal that is derived from data, services hub 110.Data, services hub 110 shown in Figure 3 comprises Internet Router 340 in addition.Data, services hub 110 comprises telephone exchange 345 in addition, so that be user's supporting telephone business of optical network system 100.Yet data, services hub 110 also can be supported other telephone service such as IP phone.If 110 of data, services hubs are supported IP phone, so obviously those skilled in the art will appreciate that and to omit telephone exchange 345 to support VoIP equipment cheaply.For example, (not shown) in a further exemplary embodiment, telephone exchange 345 can replace with other telephony interface equipment, as soft switch and gateway.But telephone exchange 345 if desired, and it can be placed away from data, services hub 110, and can connect by any one conventional equipment of interconnection.
Data, services hub 110 can comprise logic interfacing 350 in addition, and it links to each other with laser transceiver node routing device 355.When needs were supported IP operation, logic interfacing 350 can comprise speech through IP (VoIP) gateway.Laser transceiver node routing device 355 can comprise the interface protocol of conventional router to support to be used for to communicate by letter with one or more laser transceiver nodes 120.This interface protocol can comprise a kind of in gigabit (gigabit) or Fast Ethernet, Internet protocol (IP) or the sonet protocol.Yet the present invention is not limited to these agreements.Also can use other agreement and not depart from scope and spirit of the present invention.
Logic interfacing 350 and laser transceiver node routing device 355 can be read the grouping letter head that is derived from laser transceiver node 120 and Internet Router 340.The also soluble interface with telephone exchange 345 of logic interfacing 350.After reading grouping letter head, logic interfacing 350 and laser transceiver node routing device 355 can determine to send the whereabouts of information block.
Laser transceiver node routing device 355 can be corresponding optical sender 325 the down stream data transfer signal is provided.Then be sent to bi-directional shunts device 360 by optical sender 325 data converted signals.The light signal that sends to bi-directional shunts device 360 from optical sender 325 then is transferred to bi-directional data input/output end port 365, this port links to each other with second fiber waveguide 170, to support the bi-directional light data-signal between data, services hub 110 and corresponding laser transceiver node 120.The upstream optical signals that receives from corresponding laser transceiver node 120 can be fed to bi-directional data input/output end port 365, then is forwarded to bi-directional shunts device 360 at this light signal.Corresponding optical receiver 370 can be the signal of telecommunication from bi-directional shunts device 360 conversion upstream optical signals.The upstream signal of telecommunication that is generated by corresponding optical receiver 370 then is fed to laser transceiver node routing device 355.Each optical receiver 370 can comprise one or more optoelectronic receivers or photodiode, so that light signal is converted to the signal of telecommunication.
When the distance between data, services hub 110 and the corresponding laser transceiver node 120 was moderate, optical sender 325 can the 1310nm transmitting optical signal.But, when the distance between data, services hub 110 and the laser transmitter node is bigger, adopts or do not adopt suitable multiplying arrangement, optical sender 325 can both be with the wavelengths of 1550nm.
Those skilled in the art will appreciate that but the optical path length optimized choice for required between data, services hub 110 and outdoor laser transceiver node 120 is used for the optical sender 325 of each circuit.In addition, it will be apparent to one skilled in the art that wavelength discussed above is practical, but the just signal of feature of the present invention.In some cases, may use by different way and be positioned at 1310 and the communication window of 1550nm and do not depart from scope and spirit of the present invention.In addition, the present invention is not limited to 1310 and the wavelength region may of 1550nm.The wavelength that it will be apparent to one skilled in the art that light signal can not depart from scope and spirit of the present invention than short or long.
With reference now to Fig. 4,, Fig. 4 has illustrated the functional block diagram of exemplary outdoor laser transceiver node 120 of the present invention.In this exemplary embodiment, laser transceiver node 120 can comprise unidirectional light signal input port 405, and it can receive the light signal along 160 transmission of first fiber waveguide from data, services hub 110.The light signal that receives at unidirectional light signal input port 405 can comprise broadcasting video data.The light signal that receives at input port 405 is transferred to the amplifier 410 such as the fiber amplifier that mixes up erbium (EDFA), is exaggerated at this light signal.Light signal through amplifying then is transferred to splitter 415, and splitter 415 is transmitted light signal and cut apart the broadcast video light signal between the duplexer of predesignated subscriber's group 200 being designed for.
Laser transceiver node 120 can comprise bidirectional optical signal input/output end port 425 in addition, and it connects the laser transceiver node 120 and second fiber waveguide 170, to support the bidirectional traffic between data services set line device 110 and the laser transceiver node 120.Downstream optical signals flows to fiber waveguide transceiver 430 by bidirectional optical signal input/output end port 425, so that downstream optical signals is converted to the signal of telecommunication.The fiber waveguide transceiver is a light signal with the upstream electrical signal conversion in addition.Fiber waveguide transceiver 430 can comprise light/electricity and electric to optic converter.
The downstream and the upstream signal of telecommunication be transmission between fiber waveguide transceiver 430 and optical tapoff parting are by equipment 435.The optical tapoff parting can be managed and being connected of data, services hub light signal by equipment 435, and can be according to each tap multiplexer 440 routes of one or more optical tapoff heads 130 and final and one or more user's optical interface 140 transmitting optical signals or cut apart or distribute data is served the hub signal.Should point out that tap multiplexer 440 works in electrical domain with modulated laser transmitter, distribute to the user's group that is connected with one or more optical tapoff heads in order to generate light signal.
When available upstream data grouping arrives, notify optical tapoff partings by equipment 435 by each tap multiplexer 440.The optical tapoff parting is linked to each other with each tap multiplexer 440 to receive these upstream data groupings by equipment.These are grouped into data, services hub 110 by fiber waveguide transceiver 430 relayings by equipment 435 in the optical tapoff parting.Question blank can be set up by equipment 435 according to these upstream data groupings that arrive from all tap multiplexers 440 (or port) herein by the source IP address of reading each grouping in the optical tapoff parting, and makes its tap multiplexer 440 with its process relevant.This question blank then is used in the downlink path routing packets.Because each grouping enters from fiber waveguide transceiver 430, purpose IP address (this source IP address with upstream packet is identical) is checked by equipment in the optical tapoff parting.The optical tapoff parting by equipment from then on question blank can determine which port links to each other with this IP address, so it sends this and is grouped into this port.Those skilled in the art may appreciate that this situation can be described as the 3rd layer of common router feature.
The optical tapoff parting can be single port by equipment 435 and distributes a plurality of users.Specifically, the optical tapoff parting can utilize corresponding single port service to organize the user by equipment 435 more.The optical tapoff head 130 that is connected with corresponding tap multiplexer 440 can be preassigned user's group of utilizing user's optical interface 140 to receive downstream optical signals downstream optical signals is provided.
In other words, the optical tapoff parting can determine that by equipment 435 which tap multiplexer 440 will receive the downstream signal of telecommunication, or discerns which tap transmission upstream optical signals (being converted into the signal of telecommunication) in a plurality of optical tapoff heads 130.But the optical tapoff parting is by equipment 435 formatted datas, and realizes the required agreement that transmits and receive data from each user who links to each other with corresponding light tap 130.The optical tapoff parting can comprise computer or hardwired device by equipment 435, is used for program with the agreement of user's group communication of distributing to each port to carry out definition.Apply on October 27th, 2000, specify U. S. application sequence number No.60/243,978, title is in " agreement of speech and data service is provided by optical cable " common unsettled and the temporary patent application of being commissioned jointly, the embodiment of an exemplary process that defines this agreement has been discussed, and its full content in this combination as a reference.Apply in May 7 calendar year 2001, specify U. S. application sequence number No.60/289,112, title is in " agreement of speech and data service is provided by optical cable-part 2 " common unsettled and the temporary patent application of being commissioned jointly, the embodiment of another exemplary process that defines this agreement has been discussed, and its full content in this combination as a reference.
The optical tapoff parting is linked to each other with corresponding tap multiplexer 440 by each port of equipment.Utilize the optical tapoff parting by equipment 435, laser transceiver node 120 can or be adjusted user's bandwidth based on reservation based on needs or demand.Laser transceiver node 120 can provide data bandwidth for the user by preassigned increment by the optical tapoff parting by equipment 435.For example, laser transceiver node 120 can 1,2,5,10,20,50,100,200 by equipment 435 by the optical tapoff parting and the unit of 450Mb/s offers the specific user or the user organizes bandwidth.It will be apparent to one skilled in the art that other user bandwidth unit does not exceed scope of the present invention.
Signal of telecommunication transmission between the optical tapoff parting is by equipment 435 and corresponding tap multiplexer 440.Tap multiplexer 440 comes and goes each user and organizes transmitting optical signal.Each tap multiplexer 440 links to each other with a corresponding optical sender 325.As noted above, each optical sender 325 can comprise Fabry-Perot (F-P) laser, distributed Feedback (DFB) laser, or vertical cavity surface emitting laser (VCSEL) is a kind of.The downstream optical signals that optical sender produces is to 140 transmission of user's optical interface.Each tap multiplexer 440 also connects optical receiver 370.Each optical receiver 370 can comprise optoelectronic receiver or photodiode as noted above.Since optical sender 325 and optical receiver 370 can comprise existing with hardware generating and to be connected corresponding light signal, so laser transceiver node 120 is suitable for effectively upgrading and maintenance so that the data transfer rate of phenomenal growth to be provided.
Each optical sender 325 links to each other with a corresponding bi-directional shunts device 360 with each optical receiver 370.Each bi-directional shunts device 360 links to each other with duplexer 420 again, and duplexer 420 combinations are from splitter 415 unidirectional light signal that receives and the downstream optical signals that receives from corresponding optical receiver 370.In this way, utilize single fiber waveguide, distributed fiber waveguide 150 as shown in Figure 2 can provide broadcast video business and data service.In other words, light signal can be connected to the composite signal I/O end 445 that links to each other with corresponding distributed fiber waveguide 150 from each corresponding duplexer 420.
Laser transceiver node 120 is different from routine techniques, and it does not use conventional router.The parts of laser transceiver node 120 can be configured in the miniature electric encapsulation volume.For example, laser transceiver node 120 can design be suspended on the twisted wire be installed in " last mile " that is similar to network or the part of being close to the users in the pedestal of conventional wired TV equipment of placing.Should point out that term " last mile " is usually used in describing the general terms of the last part of the optic network that connects the user.
Because the optical tapoff parting is not conventional router by equipment 435, it also needs active temperature control device to keep operational environment at specified temp.In other words, in one exemplary embodiment, laser transceiver node 120 can work in the temperature range between-40 ℃ to 60 ℃.
Though, laser transceiver node 120 does not comprise that to require the expenditure of energy with the temperature of keeping laser transceiver node 120 be the active temperature control device of specified temp, but laser transceiver node 120 can comprise one or more not catabiotic passive temperature control devices 450.Passive temperature control device 450 can comprise one or more heat sink or heat pipes so that be 120 heat radiations of laser transceiver node.It will be apparent to one skilled in the art that the present invention is not limited to these exemplary passive temperature control devices.In addition, those skilled in the art also will understand, and the present invention is not limited to disclosed exemplary operation temperature range.Utilize suitable passive temperature control device 450, can dwindle or the operating temperature range of expansion of laser light transceiver node 120.
Except laser transceiver node 120 has the ability of bearing harsh outdoor environmental conditions, laser transceiver node 120 also can provide the transmission of high speed symmetric data.In other words, laser transceiver node 120 can come and go network user's uplink and downlink transmission identical bit.This is another advantage that is better than general networks, discusses in the superincumbent background technology, and general networks can not be supported the symmetric data transmission usually.In addition, laser transceiver node 120 can also be served a large number of users, is reduced in the number of connection of data, services hub 110 and laser transceiver node 120 self simultaneously.
Laser transceiver node 120 also is suitable for upgrading in network one side or whole the execution effectively of data, services hub 110 1 sides.That is to say that the hardware that upgrading constitutes laser transceiver node 120 can occur between data, services hub 110 and the laser transceiver node 120 and interior location.This means that during upgrading laser transceiver node 120 or data, services hub 110 or the two user's one side of network (from distributed fiber waveguide to user's optical interface 140) can integral body remain unchanged.
A upgrading example that can utilize principle of the present invention to realize is provided below.In an illustrative embodiment of the invention, user's one side of laser transceiver node 120 can be served 6 16 user's groups, reaches 96 users altogether.Each 16 user group can shared about 450Mb/s speed data path.Represent general speed 6*450=2.7Gb/s for 6 in these paths.Data communication path between laser transceiver node 120 and the data, services hub 110 can work in 1Gb/s in the most basic form.Therefore, can support that up to 2.7Gb/s the data path that is used for network can only be supported 1Gb/s though be used for the user's data path.This means that not every user bandwidth all is available.Because the statistical property that bandwidth is used, usually this not become it be problem.
Upgrading can increase the data path speed of 1Gb/s between laser transceiver node 120 and data, services hub 110.This can realize by increasing more 1Gb/s data paths.Increase a path again and will increase data transfer rate to 2Gb/s, this is near total user side data transfer rate.The 3rd data path will allow the data transfer rate of network side to surpass the data transfer rate of user side.In other exemplary embodiment, the data transfer rate on a link can rise to 2Gb/s from 1Gb/s, then rises to 10Gb/s.Therefore, when this happens, need not increase the optical link link of just upgrading again.
Can realize additional data path (bandwidth) by any method known to those skilled in the art.This can realize by a plurality of fiber waveguide transceivers 430 that utilization work in a plurality of fiber waveguides, or they can make a fiber waveguide work in a plurality of wavelength, maybe can use the high-speed light waveguide transceiver of illustrating above 430.Therefore, to operate a more than 1Gb/s link, must not be that prerequisite is just changed and can be realized system upgrade by upgrading laser transceiver node 120 and data, services hub 110 with user.
With reference now to Fig. 5,, Fig. 5 has illustrated the functional block diagram of the optical tapoff head 130 that links to each other with user's optical interface 140 by single fiber waveguide 150 according to one exemplary embodiment of the present invention.Optical tapoff head 130 can comprise a composite signal input/output end port, and it links to each other with another the distributed fiber waveguide that is connected laser transceiver node 120.As noted above, optical tapoff head 130 can comprise optical branching device 510, and it can be 4 road or No. 8 optical branching devices.Have and be less than or also do not exceed scope of the present invention more than 4 road or 8 tunnel along separate routes other optical tapoff heads.The optical tapoff head divisible with downstream optical signals to serve corresponding user's optical interface 140, comprise in the exemplary embodiment of 4 road optical tapoff heads at optical tapoff head 130, this optical tapoff head can be a penetrating type, this means that a part of downstream optical signals is extracted or cuts apart with No. 4 splitters that wherein comprised of service, rest light energy is in addition by descending other distributed fiber waveguide 150 that is delivered to simultaneously.
Optical tapoff head 130 is effective couplers, its can be between laser transceiver node 120 and corresponding user's optical interface 140 transmitting optical signal.Optical tapoff head 130 can cascade, or they can connect from laser transceiver node 120 by hub-and-spoke configuration.As mentioned above, but optical tapoff head 130 also route signal to other optical tapoff heads of 130 times line correlations of corresponding light tap.
Optical tapoff head 130 also can connect limited or a little light waveguide, just can not occur the high concentration of fiber waveguide like this at any specific laser transceiver node 120.In other words, in one exemplary embodiment, the optical tapoff head is a bit connecting the fiber waveguide 150 of limited quantity away from certain of laser transceiver node 120, so that avoid occurring at the laser transceiver node high concentration of fiber waveguide 150.Yet, it will be apparent to one skilled in the art that another exemplary embodiment for laser transceiver node 120 shown in Figure 12, will go through optical tapoff head 130 below and can be attached in the laser transceiver node 120.
The downstream optical signals that user's optical interface 140 is used for receiving from optical tapoff head 130 is converted to the signal of telecommunication, handles to utilize suitable communication equipment.It is upstream optical signals that user's optical interface 140 also can be used for the upstream electrical signal conversion, to be transferred to optical tapoff head 130 along distributed fiber waveguide 150.User's optical interface 140 can comprise light duplexer 515 between bidirectional optical signal splitter 520 and analog optical receiver 525, to cut apart the downstream optical signals that receives from distributed fiber waveguide 150.Light duplexer 515 can receive the upstream optical signals that is generated by digital optical transmitter 530.Digital optical transmitter 530 is converted to the light form with the binary/digital signal of electricity, so that light signal can send it back data, services hub 110.On the contrary, digital optical receiver 540 is converted to electric binary/digital signal with light signal, so that these signals of telecommunication can be handled by processor 550.
The present invention can be with various wavelengths.Yet the wavelength region may of being discussed is practical, and they are exemplary embodiment of the present invention.It will be apparent to one skilled in the art that any be higher or lower than or 1310 or the 1550nm wavelength region may between other wavelength all do not exceed scope of the present invention.
Analog optical receiver 525 can be broadcasted downstream optical video signal and is converted to the analog radio frequency TV signal, to export modulated video one way signal output 535.But modulated video one way signal output 535 feed video receivers are as television set (not shown) or broadcast receiver (not shown).But the video transmission of analog optical receiver 525 treatment of simulated modulation and the digital modulation radio frequency transmission that is used for digital TV application.
Bidirectional optical signal splitter 520 can transmit combination optical signal in respective direction.That is to say that the downstream optical signals that enters bi-directional light splitter 520 from light duplexer 515 is transferred to digital optical receiver 540.The upstream optical signals that enters into this from digital optical transmitter 530 is sent to light duplexer 515, then delivers to optical tapoff head 130.Bidirectional optical signal splitter 520 links to each other with digital optical receiver 540, and receiver 540 is converted to the signal of telecommunication with the down stream data transfer light signal.Bidirectional optical signal splitter 520 also links to each other with digital optical transmitter 530 therebetween, being light signal with the upstream electrical signal conversion.
Digital optical receiver 540 can comprise one or more optoelectronic receivers or photodiode so that light signal is converted to the signal of telecommunication.Digital optical transmitter can comprise one or more lasers, as Fabry-Perot (F-P) laser, and distributed Feedback (DFB) laser, and vertical cavity surface emitting laser (VCSEL).
Digital optical receiver 540 links to each other with processor 550 with digital optical transmitter 530, and processor 550 is intended for the data of instantaneous user's optical interface 140 based on embedded address choice.The data of being handled by processor 550 can comprise one or more phones and data service, as internet service.Processor 550 links to each other with phone input/input 555, and it can comprise an analog interface.Processor 550 also can connect data-interface 560, and data-interface 560 can be computer equipment, set-top box, and ISDN phone and other similar devices provide link.As selection, data-interface 560 can comprise and the interface of speech through IP (VoIP) phone or Ethernet Phone.Data-interface 560 can comprise Ethernet (10BaseT, 100BaseT, Gigabit) interface, HPNA interface, USB (USB), IEEE1394 interface, a kind of in adsl interface and other the similar interface.
With reference now to Fig. 6,, Fig. 6 is the functional block diagram according to the example data service hub 110B of an optional exemplary embodiment of the present invention, wherein upstream optical signals and downstream optical signals are along independently fiber waveguide transmission, as top second fiber waveguide 170 and the 3rd fiber waveguide 180 with reference to figure 1 discussion.In other words, in this exemplary embodiment, second fiber waveguide 170 is designed for only transmits downstream optical signals, and the 3rd fiber waveguide 180 is designed for only from laser transceiver node 120 transmission upstream optical signals.
This example data service hub 110B also comprises the downstream optical signals output port 605 that links to each other with second fiber waveguide 170.Data, services hub 110B also comprises the upstream optical signals output port that links to each other with the 3rd fiber waveguide 180.Utilize this example data service hub 110B, independently fiber waveguide 180 and 170 corresponding upstream of transmission and downstream optical signals.Utilize this exemplary embodiment,, therefore can preserve energy owing to be used to make up and separate the add-on assemble of upstream and downstream optical signals before having removed.
The data, services hub 110B of this exemplary embodiment also can reduce the distance limit that causes because of power loss and cross-talk.In other words, more many each end of optical sender of luminous power providing, because the incomplete isolation between upstream and the downstream optical signals direction may cause interference at receiver than received power.By upstream and downstream optical signals are used independently fiber waveguide, can greatly reduce or eliminate this interference.
With reference now to Fig. 7,, Fig. 7 has illustrated the functional block diagram of exemplary outdoor laser transceiver node 120B, and except the one way signal that can mix with downstream optical signals, this node also can be accepted along the upstream and the downstream optical signals of independently fiber waveguide transmission.In other words, laser transceiver node 120B can be connected with example data service hub 110B shown in Figure 6.
Laser transceiver node 120B can comprise the downstream optical signals input port 705 that links to each other with second fiber waveguide 170 shown in Figure 1.Downstream optical signals input port 705 connects optical receiver 710, so that downstream optical signals is converted to the signal of telecommunication.Optical receiver 710 arrives the optical tapoff parting by equipment 435 with electrical signals again.
The laser transceiver node 120B of Fig. 7 can comprise optical sender 720 in addition, and its electrical signal conversion that will be received by equipment 435 from the optical tapoff parting is a light signal.The light signal that is generated by optical sender 720 is fed to upstream optical signals output port 715.Upstream optical signals output port 715 links to each other with the 3rd fiber waveguide 180 shown in Figure 1.Compare exemplary laser transceiver node 120A shown in Figure 4, bi-directional shunts device 360 is replaced by second splitter 4202.The upstream optical signals that the corresponding user's optical interface 140 of the wavelength ratio of the light signal that optical sender 325 generates produces is long.For example, in one exemplary embodiment, optical sender 325 can generate wavelength 1410 and 1490nm between light signal, and upstream optical signals remains on the wavelength region may of 1310nm.
As noted above, it will be apparent to one skilled in the art that the wavelength of being discussed is the signal of feature of the present invention.In some cases, may use by different way to be positioned at 1310 and the communication window of 1550nm, and not depart from scope and spirit of the present invention.In addition, the present invention is not limited to wavelength region may discussed above.The wavelength that it will be apparent to one skilled in the art that light signal does not exceed scope and spirit of the present invention than weak point or than length.
Because the wavelength region may between upstream and downstream optical signals there are differences, additional duplexer 420 alternative aforesaid bi-directional shunts devices 360 (as the exemplary embodiment signal of Fig. 4).The loss of duplexer 420 that should be additional or alternative is different with the aforementioned bi-directional shunts device 360 that uses in the exemplary embodiment of Fig. 4.The additional duplexer 420 of this usefulness substitutes bi-directional shunts device 360 and also can be applicable to user's optical interface 140.That is to say that when upstream and downstream optical signals worked in separately different wavelength regions, the bidirectional optical signal splitter of user's optical interface 140 can substitute with duplexer 420.Substitute bi-directional shunts devices 360 with duplexer 420 and can reduce optical loss between laser transceiver node 120 and the user's optical interface 140.
As selection, if laser transceiver node 120 uses identical wavelength over against upstream and downstream optical signals, then optical interface 140 uses the bidirectional optical signal splitter 520 with corresponding light power loss shown in Figure 5.It will be apparent to one skilled in the art that and to do various other replacements and not depart from scope and spirit of the present invention the parts of laser transceiver node 120.
With reference now to Fig. 8,, Fig. 8 has illustrated another exemplary outdoor laser transceiver node 120C, and except a plurality of fiber waveguides of transfer of unidirectional signal, it can be accepted from the light signal of upstream and downstream fiber waveguide transmission independently.In this exemplary embodiment, the laser transceiver node 120C of Fig. 8 can comprise a plurality of one way signal input ports 805 that link to each other with a plurality of first fiber waveguides 160.In this exemplary embodiment, compare with the laser transceiver node 120A of Fig. 4 and the laser transceiver node 120B of Fig. 7, from laser transceiver node 120C shown in Figure 8, removed amplifier 410.Amplifier 410 is removed from laser transceiver node 120C and is placed in the data, services hub 110.
Utilize first group of duplexer 420 from the light signal of a plurality of first fiber waveguide 160 transmission 1Be derived from second group of duplexer 420 2Upstream and downstream optical signals combination.This is to be designed for to move amplifier 410 from the laser transceiver node 120C of Fig. 8 and (typically comprise the fiber amplifier that mixes up erbium-EDFA) to data, services hub 110, and being used to comprise a plurality of first fiber waveguides that are fed into laser transceiver node 120C, this design can be considered based on the availability of economy and fiber waveguide.
Fig. 9 has illustrated the data, services hub 110D of another exemplary embodiment, wherein such as the one way signal and the downstream optical signals combination of video or radiofrequency signal.In this exemplary embodiment, data, services hub 110B also comprises splitter 415, and the broadcast video light signal is fed to corresponding duplexer 420.Corresponding duplexer 420 combination broadcast video light signals and the down stream data transfer light signal that generates by corresponding optical sender 325.In this way, because therefore broadcast video light signal and the down stream data transfer light signal combination of transmitting along second fiber waveguide 170 can save first fiber waveguide 160 shown in Figure 1.
Figure 10 has illustrated another exemplary laser transceiver node 120D that can be connected with data, services hub 110D shown in Figure 9.In this exemplary embodiment, laser transceiver node 120D comprises a combination downstream optical signals input 1005, and it connects second fiber waveguide 160 so that the combination downstream optical signals that comprises broadcast video business and data service is provided.Laser transceiver node 120D also comprises duplexer 420, and broadcast video or radiofrequency signal are fed to amplifier 410.Broadcast video or radio frequency light signal then are sent to splitter 415, and splitter 415 is sent to these light signals first group of duplexer 420 again 1The combination of data, services hub 110D shown in Figure 9 and laser transceiver node 120D shown in Figure 10 can be saved the fiber waveguide between these two equipment.
As noted above, in a further exemplary embodiment, can only use an optical fiber (not shown) with link data service hub 110 and laser transceiver node 120.In this exemplary embodiment, different wave length can be used for transmitting upstream and downstream optical signals.
Figure 11 is the functional block diagram of another exemplary outdoor laser transceiver node 120E, and it uses double receiver-transmitter between tap multiplexer 440 and corresponding user's group.In this embodiment, be derived from downstream optical signals quilt shunt immediately after tap multiplexer 440 of each corresponding tap multiplexer 440.In this exemplary embodiment, each optical sender 325 is designed for and only serves 8 users, and these are different with 16 users of service among other embodiment.But each tap multiplexer 440 is service 16 or user still less usually.
In this way, can greatly reduce the shunt loss that causes because of optical tapoff head 130.For example, not immediately along separate routes in other exemplary embodiment of downstream optical signals, these embodiment are designed for service 16 or less user after tap multiplexer 440, and its its corresponding theory shunt loss is near 14dB (comprising allowable shrinkage).For example serve 8 or less user's current exemplary embodiment, theoretical shunt loss is reduced to about 10.5dB.
At laser transceiver node 120E, because at any time receiver 370 or another receiver 370 are just from the relative users received signal, and another receiver 370 is in received signal, so optical receiver 370 can not be in parallel.In the receiver 370 possibility output noises that receive any upstream optical signals, this will not disturb the signal from the receiver 370 that receives upstream optical signals to receive.Therefore, can use switch 1105 to select the current optical receiver 370 that is receiving upstream optical signals.Because the tap multiplexer is known which optical receiver 370 and should be received upstream optical signals at any given time, so it can control switch 1105.
Figure 12 is the functional block diagram of another exemplary outdoor laser transceiver node 120F, and it is included in the inner optical tapoff head 130 that is provided with of this node self.In this architecture, can link to each other with laser transceiver node 120F from the fiber waveguide 150 of each user's optical interface 140.Usually, the feasible quantity that needs two laser transceiver nodes 120 to support fiber waveguide 150 of quantity that connects the fiber waveguide 150 of laser transceiver node 120F.But, when existing, can use a laser transceiver node 120F to serve existing service basic less than user's maximum quantity.When service basic expands to the quantity that needs additional laser transceiver node 120, can increase the additional laser transceiver node.
By in laser transceiver node 120F optical tapoff head 130 being set, for above-mentioned reasons, two or more transceiver node 120F can be total to the location with another node.In other words, this exemplary embodiment makes that two or more transceiver node 120F can be mutually near placing.The modes of emplacement of this laser transceiver node 120F can be saved energy, therefore can greatly save cost.In addition, utilize this design of location altogether, can be easy to obtain the expansion in future of optical bodies architecture 100.That is to say, a laser transceiver node 120F can be installed join up to more user and need in the optic network of this laser transceiver node architecture 100.Because more users join optic network architecture 100, fiber waveguide 150 can connect the laser transceiver node of common location.
With reference now to Figure 13,, Figure 13 has illustrated to utilize laser transceiver node 120 of the present invention to handle the illustrative methods of unidirectional and bidirectional optical signal.Figure 13 provides basically by laser transceiver node 120 and has carried out the general introduction of handling.
In following process, for realizing described function of the present invention, some step must occupy before other step naturally.Yet if the order of described step does not change function of the present invention, the present invention is not limited to these sequence of steps.That is to say, can think that some step can carry out before or after other step, and not depart from scope and spirit of the present invention.
In exemplary laser transceiver node general introduction process 1300, step 1305 is a first step.In step 1305, amplify the light signal of downstream rf modulations by amplifier shown in Figure 4 410.As noted above, amplifier 410 can comprise the fiber amplifier (EDFA) that mixes up erbium.Yet other image intensifer does not exceed scope of the present invention.
Then, in step 1307, the bandwidth of utilizing the optical tapoff parting to distribute between the relative users by equipment 435.In other words, the optical tapoff parting can be according to the bandwidth of preengaging or adjust based on needs the user by equipment 435.The optical tapoff parting can 1,2,5,10,20,50,100,200 by equipment 435 and the unit of 450Mb/s provide specific user or user to organize bandwidth.
In step 1310, through the light signal and the downstream optical signals combination that is derived from tap multiplexer 440 of downstream rf modulations.The combination of downstream optical signals can occur in duplexer 420.Then, be transferred to the corresponding light tap combination 200 of distribution along distributed fiber waveguide 150 through the downstream optical signals of combination in step 1315.
In step 1320, upstream optical signals is received by optical receiver 370, then is converted into the upstream signal of telecommunication.The upstream signal of telecommunication is sent to corresponding tap multiplexer 440.The signal of telecommunication that receives from corresponding tap multiplexer 440 is equipped with combination in the optical tapoff parting by equipment 435 according to step 1325.Equally in step 1325, utilize fiber waveguide transceiver 430 or optical sender 720 to be converted into light signal by the upstream signal of telecommunication of equipment 435 from the optical tapoff parting.In step 1330, upstream optical signals is transferred to data, services hub 110 by bidirectional optical waveguide 170 or dedicated uplink time waveguide 180.
With reference now to Figure 14,, Figure 14 has illustrated to utilize according to the present invention laser transceiver node 120 to handle the logical flow chart of the example process of downstream optical signals.Specifically, the logical flow chart of Figure 14 has been illustrated to be used for to transmit the illustrative methods of light signal at least one user from data service provider 110.
As noted above, in following process, for realizing described function of the present invention, some step must occupy before other step naturally.Yet if the order of described step does not change function of the present invention, the present invention is not limited to these sequence of steps.That is to say, can think that some step can carry out before or after other step, and not depart from scope and spirit of the present invention.
Be used for transmitting the example process 1400 of light signal at least one user from data service provider, step 1405 is a first step.In step 1405, downstream optical signals is received at laser transceiver node 120.For example, downstream optical signals can be received at unidirectional light signal input port 405 shown in Figure 4.In addition, downstream optical signals also can be received at the bidirectional optical signal I/O end 425 of Fig. 4 signal.
Then, in step 1410, downstream optical signals can be converted into the signal of telecommunication.In other words, the downstream optical signals that receives at bidirectional optical signal input/output end port 425 can utilize fiber waveguide transceiver 430 to be converted to the signal of telecommunication.As noted above, fiber waveguide transceiver 430 can comprise light/electric transducer.Then, in step 1415, the optical tapoff parting is divisible through electrical signal converted between the tap multiplexer 440 of distributing to optical tapoff head group 130 by equipment 435.In step 1420, utilize the optical tapoff parting to can be the user and cut apart the downstream bandwidth by equipment 435.
In this step, bandwidth can be cut for each user's component based on reservation or based on current demand by equipment 435 in the optical tapoff parting.The optical tapoff parting can 1,2,5,10,20,50,100,200 by equipment 435 and the unit of 450Mb/s cut apart bandwidth.Yet the present invention is not limited to these increments.Other bandwidth increments do not exceed scope and spirit of the present invention.The optical tapoff parting can be distributed bandwidth by equipment 435 by this way by the program that the user's group that is implemented as and distributes to single port communicates the definition agreement.These single ports link to each other with corresponding tap multiplexer 440.
In step 1425, the downstream signal of telecommunication of being handled by equipment 435 by the optical tapoff parting utilizes tap multiplexer 440 to be re-used.Then, in step 1430, the downstream signal of telecommunication utilizes optical sender 325 to be converted into downstream optical signals.As noted above, optical sender 325 can comprise Fabry-Perot (F-P) laser, distributed Feedback (DFB) laser, or a kind of in the vertical cavity surface emitting laser (VCSEL).Yet as noted above, the laser of other types does not exceed scope of the present invention.
In step 1435, the light signal of modulating from the unidirectional RF of first fiber waveguide, 160 receptions utilizes splitter 415 to be mulitpath along separate routes.Then, in step 1440, through the downstream path and the combination of paths that is derived from the downstream optical signals of tap multiplexer 440 of the light signal of rf modulations.
Figure 15 is the logical flow chart that utilizes the example process of exemplary laser transceiver node 120 processing upstream optical signals according to the present invention.Specifically, Figure 15 has illustrated to be used for to transmit the process of light signal to the data service provider hub from least one user.
As noted above, in following process, for realizing described function of the present invention, some step must occupy before other step naturally.Yet if the order of described step does not change function of the present invention, the present invention is not limited to these sequence of steps.That is to say, can think that some step can carry out before or after other step, and not depart from scope and spirit of the present invention.
In the up process 1500 of this exemplary laser transceiver node, step 1505 is a first step.In step 1505, along distributed fiber waveguide 150 transmission sources from user's upstream optical signals to optical tapoff head 130.Then upstream optical signals is changed by optical receiver 370 in step 1510.In step 1515, the upstream signal of telecommunication is made up by equipment 435 in the optical tapoff parting.Then,, utilize the upstream bandwidth of optical tapoff parting, the way of the allocation of downlink time bandwidth of discussing with reference to Figure 14 above this is similar to by equipment 435 distributing user in step 1520.
For upstream optical signals, the optical tapoff parting can utilize time division multiple access (TDMA) by equipment 435 so that service or support signal from a plurality of tap multiplexers 440.Those skilled in the art will appreciate that in time division multiple access the optical tapoff parting in time is transformed into another tap multiplexer 440 from a tap multiplexer 440 by equipment 435.On the contrary, for downstream optical signals, the optical tapoff parting utilizes Time Division Multiplexing by equipment 435.Those skilled in the art will appreciate that when the optical tapoff parting by equipment 435 when a plurality of tap multiplexers 440 send data, time division multiplexing appears.In time division multiplexing, no longer remove signal, so receive clock keeps synchronously.
In step 1525, the upstream signal of telecommunication through making up utilizes fiber waveguide transceiver 430 or optical sender 420 to be converted into upstream optical signals.Then, in step 1530, the upstream optical signals through making up is passed to data, services hub 110 along the optical wave conduction such as second fiber waveguide 170 or the 3rd fiber waveguide 180.
Figure 16 utilizes optical tapoff head 130 according to the present invention to handle the logical flow chart of unidirectional and bidirectional optical signal.As noted above, in following process, for realizing described function of the present invention, some step must occupy before other step naturally.Yet if the order of described step does not change function of the present invention, the present invention is not limited to these sequence of steps.That is to say, can think that some step can carry out before or after other step, and not depart from scope and spirit of the present invention.
In optical tapoff head process 1600, step 1605 is a first step.The fiber waveguide of step 1605 from linking to each other with the laser transceiver node, as distributed fiber waveguide 150, transfer signal is to composite signal input/output end port 505.Then, in step 1610, utilize optical branching device 510 along separate routes by the downstream optical signals of tap.Optical branching device 510 can shunt to downstream optical signals one or more user interfaces or other taps or splitter or their combination by distributed fiber waveguide 150.In step 1615, downstream tap combination optical signal can be transferred to relative users, and utilizes optical branching device 510 to receive and the combination upstream optical signals from relative users.
Figure 17 utilizes user's optical interface 140 according to the present invention to handle the logical flow chart of unidirectional light signal and bidirectional optical signal.As noted above, in following process, for realizing described function of the present invention, some step must occupy before other step naturally.Yet if the order of described step does not change function of the present invention, the present invention is not limited to these sequence of steps.That is to say, can think that some step can carry out before or after other step, and not depart from scope and spirit of the present invention.
Step 1705 is a first step in user's optical interface process 1700, in step 1705, utilizes light duplexer 515 to receive the combination downstream optical signals.Then, in step 1710, separate downstream optical signals through rf modulations from the down stream data transfer light signal that is derived from tap multiplexer 440.In step 1715, utilize analog optical receiver 525 conversions to be the downstream electro-optical signal through the light signal of downstream rf modulations.As noted above, except being used for the digital modulation signals that digital TV uses, analog optical receiver can also the treatment of simulated modulation signal.
In step 1720, the upstream signal of telecommunication utilizes digital optical transmitter 530 to be converted into light signal.As noted above, digital optical transmitter 530 can comprise Fabry-Perot (F-P) laser, distributed Feedback (DFB) laser, or a kind of in vertical cavity surface emitting laser (VCSEL) or other laser-likes.Can be from phone input/output end port 555 or data-interface 560 or the two generation upstream signal of telecommunication (as above-mentioned discussion).
In step 1725, the downstream signal of telecommunication of launching from digital optical receiver 540 is received by processor 550.Processor 550 is transferred to suitable output equipment with these signals of telecommunication again, as phone input/output end port 555 or data-interface 560 or the two.As noted above, phone input/output end port 555 or data-interface 560 or the two can generate the upstream signal of telecommunication, and these signals of telecommunication are sent to processor 550, then utilize digital optical transmitter 530 to be converted into light signal.
Those skilled in the art will appreciate that optic network architecture 100 of the present invention can provide a kind of in video, phone and the compunication business at least by light signal.Those skilled in the art also will understand, and can remove to comprise the video layer of rf modulated signal from exemplary optical network architecture 100, and not depart from scope and spirit of the present invention.
Utilize the present invention, the Full Fibre Network and the method that come and go the descending and uplink identical bit of the network user can be provided.In addition, optical network system provided by the invention and method can be served a large number of users in the number of connection that reduces the data, services hub.
The present invention also can provide a kind of active signal source, and it can be positioned between data, services hub and the user, and can be designed for and bear outdoor environmental conditions.The present invention also can be designed for and be suspended on the twisted wire, or is installed in the pedestal that is similar to conventional wired TV equipment of placing in last mile of communication network.System and method of the present invention can receive gigabit (Gigabit) or Fast Ethernet communication at least with optical form from the data, services hub, and with the wide assign group of cutting apart or being assigned as predetermined quantity of this light belt.System and method of the present invention can add or compression bandwidth based on the demand assignment of one or more users on the fiber optic network.In addition, optical network system of the present invention is suitable for upgrading whole the execution effectively of network one side.In other words, this optical network system active signal source of allowing HardwareUpgring to occur in to dispose between data, services hub and data, services hub and the user inner and between the position.
The description that it should be understood that the front only relates to the signal embodiments of the invention, need not depart from the defined scope and spirit of the present invention of following claim and just can make various changes.

Claims (52)

1. optical network system comprises:
A data services set line device;
At least one optical tapoff head;
At least one the user's optical interface that links to each other with described optical tapoff head;
A laser transceiver node that between described data, services hub and described optical tapoff head, disposes, be used between described data, services hub and described optical tapoff head, transmitting light signal, and be used between the user of described optical network system, distributing bandwidth, and
The one or more fiber waveguides that between corresponding optical tapoff head and described laser transceiver node, connect, be used to transmit upstream optical signals and downstream optical signals, thereby in the response user's request, user's light belt is wide can be by the laser transceiver node control time, the minimum number of described waveguide.
2. according to the optical network system of claim 1, wherein the laser transceiver node comprises that also an optical tapoff parting by equipment, is used for distributing bandwidth between the user of optical network system.
3. according to the optical network system of claim 1, wherein the laser transceiver node also comprises:
At least one multiplexer that is connected by equipment with the optical tapoff parting;
With at least one optical sender that described at least one multiplexer links to each other, the downstream optical signals that is used for receiving from described data, services hub sends at least one user's optical interface of described optical network system; And
At least one optical receiver that links to each other with each multiplexer is used for receiving and the conversion upstream optical signals from least one user's optical interface of described optical network system.
4. according to the optical network system of claim 1, wherein the laser transceiver node also comprises at least one duplexer that links to each other with optical receiver with described at least one optical sender, downstream rf modulations light signal and described downstream optical signals that each duplexer combination receives from described data, services hub, wherein each duplexer links to each other with corresponding fiber waveguide.
5. according to the optical network system of claim 1, wherein the laser transceiver node is accepted the gigabit Ethernet light signal and described Ethernet light signal is divided into the grouping of predetermined quantity from described data, services hub.
6. according to the optical network system of claim 1, wherein the laser transceiver node comprises passive cooling system so that work in the temperature range between-40 ℃～60 ℃.
7. according to the optical network system of claim 1, wherein the laser transceiver node can be installed on the twisted wire in overhead facility environment.
8. according to the optical network system of claim 1, wherein the laser transceiver node is installed in the pedestal in the subsurface equipment environment.
9. according to the optical network system of claim 1, the distance between wherein said laser transceiver node and the described data, services hub comprises the scope between 0～80km.
10. according to the optical network system of claim 1, wherein the laser transceiver node comprises at least one optical sender, and each optical sender comprises a kind of in fabry-Perot type laser, distributed feedback laser and the vertical cavity surface emitting laser (VCSEL).
11. optical network system according to claim 1, wherein the laser transceiver node also comprises the optical tapoff parting by equipment, and it distributes additional or the squeezed light bandwidth is given at least one relevant with other user's optical interfaces in described optical network system user's optical interface.
12. according to the optical network system of claim 1, wherein the laser transceiver node comprises an optical tapoff parting by equipment, with management upstream and downstream optical signals agreement.
13. according to the optical network system of claim 11, wherein a kind of agreement comprises time division multiple access protocol.
14., wherein be used for the data bit-rate substantial symmetry of upstream and downstream optical signals according to the optical network system of claim 1.
15. according to the optical network system of claim 1, wherein each fiber waveguide is handled the data transfer rate of 450Mb/s at least.
16. according to the optical network system of claim 1, wherein each optical tapoff head comprises at least one optical branching device.
17. according to the optical network system of claim 1, an optical tapoff head of wherein serving specific user's optical interface grouping links to each other with another optical tapoff head.
18. according to the optical network system of claim 1, wherein each optical tapoff head also transmits upstream and downstream optical signals except the light signal of transmission downstream RF modulation.
19. according to the optical network system of claim 1, wherein each user's optical interface comprises an analog optical receiver, a digital optical receiver and a digital optical transmitter.
20. optical network system according to claim 1, wherein said fiber waveguide is first group of fiber waveguide, described optical network system also is included in the second group of fiber waveguide that disposes between described data, services hub and the laser transceiver node, described second group of fiber waveguide comprises and is used to transmit first waveguide of upstream optical signals to the data, services hub, and is used to transmit second fiber waveguide of downstream optical signals to described laser transceiver node.
21. an optical network system comprises:
A data services set line device;
At least one optical tapoff head;
At least one the user's optical interface that links to each other with described optical tapoff head;
A laser transceiver node that between described data, services hub and described at least one user's optical interface, disposes, be used between described data, services hub and described optical tapoff head, transmitting light signal, and be used between the user of described optical network system, distributing bandwidth, wherein said optical tapoff head is configured in described laser transceiver intra-node, and
The one or more fiber waveguides that between corresponding optical tapoff head and described laser transceiver node, connect, be used to transmit described upstream optical signals and downstream optical signals, thereby in the response user's request, user's light belt is wide can be by the laser transceiver node control time, the minimum number of described waveguide.
22. according to the optical network system of claim 21, wherein each optical tapoff head comprises an optical branching device.
23. according to the optical network system of claim 21, an optical tapoff head of wherein serving specific user's optical interface grouping links to each other with another optical tapoff head.
24. one kind is used for transmitting the method for light signal at least one user from data service provider, comprises step:
At the laser transceiver node, receive downstream optical signals from described service provider;
At described laser transceiver node, between preassigned multiplexer, cut apart described downstream signal;
At described laser transceiver node, between the user, distribute bandwidth;
In the multiplexing described downstream signal of described preassigned multiplexer; And
Arrive at least one user by at least one optical tapoff head along the corresponding combination of at least one fiber waveguide transmission downstream optical signals.
25., comprise that also distributing user gives the step of corresponding each multiplexer according to the method for claim 24.
26., also comprise step according to the method for claim 24:
Receive the light signal of modulating through downstream RF from described service provider; And
Combination downstream optical signals and the light signal of modulating through downstream RF.
27. according to the method for claim 24, the step that wherein receives downstream optical signals also comprises from described data service provider and receives at least gigabit or Fast Ethernet light signal step by step.
28., also comprise the step of utilizing passive cooling system between-40 ℃ and 60 ℃, to operate the laser transceiver node according to the method for claim 24.
29., also be included in the overhead facility environment step of laser transceiver node to the twisted wire be installed according to the method for claim 24.
30., also be included in and the laser transceiver node be installed in the subsurface equipment environment to the interior step of pedestal according to the method for claim 24.
31., also comprise by light signal a kind of step in video, phone and the internet service is provided according to the method for claim 24.
32., also comprise step according to the method for claim 24:
Utilize at least one optical tapoff head to make up downstream optical signals along separate routes; And
Arrive at least one user along at least one one optical waveguide transmission through downstream optical signals along separate routes.
33., also be included in the step that connects a corresponding light tap between 1 and 16 users according to the method for claim 24.
34., also comprise from another optical tapoff head and present the step that light signal is given an optical tapoff head according to the method for claim 24.
35., also comprise the step of utilizing described at least one fiber waveguide between 1 and 16 users, to serve according to the method for claim 24.
36. method according to claim 24, the step of wherein changing the downstream signal of telecommunication also comprises at least a in modulation fabry-Perot type laser, distributed feedback laser and the vertical cavity surface emitting laser (VCSEL), to generate downstream optical signals.
37., wherein distribute the step of bandwidth also to be included as the step that at least one relevant with other user's optical interfaces in described optical network system specific user's optical interface distributes additional or squeezed light bandwidth according to the method for claim 24.
38. according to the method for claim 24, the step of wherein cutting apart the downstream signal of telecommunication also comprises utilizes the time division multiplexing agreement to cut apart the downstream signal of telecommunication step by step between preassigned multiplexer.
39., also be included in the step that keeps the data bit-rate of substantial symmetry between upstream optical signals and the downstream optical signals according to the method for claim 24.
40., also comprise with the step of the data rate transmission light signal of 450Mb/s at least according to the method for claim 24.
41. one kind is used for transmitting the method for light signal to data service provider from least one user, comprises step:
The upstream optical signals that is derived from least one user is transferred at least one optical tapoff head;
At the laser transceiver node, receive upstream optical signals from described at least one optical tapoff head;
At described laser transceiver node, upstream optical signals is converted to the signal of telecommunication;
At described laser transceiver node, the combination upstream signal of telecommunication;
At described laser transceiver node, at least one user is distributed bandwidth;
With described combination upstream electrical signal conversion is light signal; And
Transmit described combination upstream optical signals to described data service provider along at least one one optical waveguide.
42., also comprise the step of utilizing passive cooling system between-40 ℃ and 60 ℃, to operate described laser transceiver node according to the method for claim 41.
43., also be included in the overhead facility environment step of laser transceiver node to the twisted wire be installed according to the method for claim 41.
44., also be included in and the laser transceiver node be installed in the subsurface equipment environment to the interior step of pedestal according to the method for claim 41.
45., also comprise by light signal a kind of step in video, phone and the internet service is provided according to the method for claim 41.
46., also comprise and utilize the step of at least one optical tapoff head source array from a plurality of users' corresponding upstream optical signals according to the method for claim 41.
47., also be included in the step that connects a corresponding light tap between 1 and 16 users according to the method for claim 41.
48., also comprise the step of placing described laser transceiver node near the optical tapoff head relevant with described data service provider according to the method for claim 41.
49., also comprise from another optical tapoff head and present the step that light signal is given an optical tapoff head according to the method for claim 41.
50., also comprise the step that single fiber waveguide that utilization links to each other with corresponding each multiplexer is served between 1 and 16 users according to the method for claim 41.
51., also be included in the step that keeps the data bit-rate of substantial symmetry between upstream optical signals and the downstream optical signals according to the method for claim 41.
52., also comprise with the step of the data rate transmission light signal of 450Mb/s at least according to the method for claim 41.
CN 01819957 2000-10-04 2001-07-05 System and method for communicating optical signals between data service provider and subscribers Expired - Fee Related CN1265568C (en)

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US60/243,978 2000-10-27
US25883700P 2000-12-28 2000-12-28
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