CN101841742A - Passive optical network system supporting wireless communication - Google Patents

Passive optical network system supporting wireless communication Download PDF

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Publication number
CN101841742A
CN101841742A CN200910127693A CN200910127693A CN101841742A CN 101841742 A CN101841742 A CN 101841742A CN 200910127693 A CN200910127693 A CN 200910127693A CN 200910127693 A CN200910127693 A CN 200910127693A CN 101841742 A CN101841742 A CN 101841742A
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signal
optical
telecommunication
optical network
light
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CN101841742B (en
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林玉明
田伯隆
杨启瑞
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Industrial Technology Research Institute ITRI
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Industrial Technology Research Institute ITRI
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Abstract

The invention relates to a passive optical network system supporting wireless communication, which comprises an optical line terminal (OLT) arranged at a local end, an optical distribution network (ODN) and a plurality of optical network units (ONU) respectively arranged at a user end. The optical distribution network is connected with the optical line terminal (OLT) and the optical network units in a one-to-many mode; the optical line terminal is used for sending a downlink optical signal to the optical distribution network and receiving an uplink optical signal; the optical distribution network guides the optical signals annularly to each optical network unit; and the optical network units receive and reflect the downlink optical signal, process the received downlink optical signal, receive and process the uplink optical signal, add an electrical signal to be uploaded to the uplink optical signal and add data received from a long-distance antenna to the uplink optical signal. The aim of supporting wireless communication is fulfilled by using the architecture.

Description

Support the passive optical network system of wireless telecommunications
Technical field
The present invention relates to a kind of smooth multitask system (Optical multiplex system), particularly a kind of passive optical network system of supporting wireless telecommunications.
Background technology
Broadband wireless accesses that (Broadband Wireless Access, BWA) technology is a kind of technology of fast wireless network (wireless intemet) with data network (data network) transmission that providing in zone widely.At global intercommunication microwave access (WiMAX, Worldwide Interoperability for Microwave Access) standard (IEEE standard IEEE 802.16d/e) makes the transmission rate of broadband wireless access technology significantly increase after formulating.
Please refer to Fig. 1, it is the central office of existing broadband wireless access system and the system architecture schematic diagram between base station.The broadband wireless access technology must be at central office 90 (Central Office) and a plurality of base station 92a, individual configuration special line 93a between 92b (Base Station), 93b (Dedicated lines) when the hardware construction.Framework shown in Figure 1 belongs to the framework of a kind of single-point to multiple spot (one-to-many).
Passive optical network (Passive Optical Network, PON) be the optical fiber network system of a kind of single-point to multiple spot, be commonly used to connect the service of being positioned at the optical line terminal of dealer at local side (Optical Line Terminal is provided, OLT) device and a plurality of optical network unit (Optical Network Units near user's end, ONU also claims client light network termination device) device.See also Fig. 2, it is the optical line terminal 94 and optical network unit 96a of existing passive optical network system, the system architecture schematic diagram between 96b.Passive optical network is to use passive component 97 (to need not the assembly of plug-in, unpowered) carry out the difference of light.The optical splitter assembly of this kind passive type is common optical splitter device (Optical Splitter).
More above-mentioned Fig. 1 and Fig. 1, can obviously find out, the system architecture that the system architecture of passive optical network and broadband wireless access is though all belong to the configuration frame of one-to-many.
Secondly, because the basic construction (infrastructure) of fiber optic network is many early than the broadband wireless access network, therefore, part broadband wireless dealer promptly cooperates with the passive optical network dealer, the base station of broadband wireless network is arranged on the optical network unit position of passive optical network, and central office is arranged on the optical line terminal position of passive optical network.Both adopt same passive optical network to transmit data simultaneously.Thus, can fully use the frequency range of this passive optical network.
Above-mentionedly provide radio communication to be found in to disclose No. 2008/0063397 patent in the U.S. on March 13rd, 2008 and " provide wireless System and method for (System and method for providing wireless over a passive optical network) " in passive optical network in the technology of passive optical network.In addition, similar techniques also is found in:
D.Qian, J.Hu, P.Ji, the paper that T.Wang and M.Cvijetic delivered (please refer to 10-Gb/sOFDMA-PON for Delivery of Heterogeneous Services "; OFC 2008); M.Bakaul; A.Nirmalathas; C.Lim; the paper that D Novak and R.Waterhouse are delivered (please refer to Hybrid Multiplexing of Multiband Optical Access Technologies Towards an Integrated DWDM Network, IEEE Photonics Technology Letters, vol.18, no.21, Nov.2006, pp.2311-2313), and M.Crisp, S.Li, A.Watts, the paper that R.Penty and I.White delivered (please refer to Uplink and Downlink Coverage Improvements of 802.11g Signals Using a Distributed Antenna Network; " IEEE Journal of Lightwave Technology, vol.25, no.11, Nov.2007, pp.3388-3395.).
Summary of the invention
In view of the demand of above-mentioned combining wireless transmission with light Netcom news, reach and fully use the good fiber optic network capital construction of construction, the present invention proposes a kind of passive optical network system of supporting wireless telecommunications, supports wireless telecommunications and optical communication demand simultaneously with lower optical transmission loss and simpler and more direct hardware structure.
The present invention proposes a kind of passive optical network system of supporting wireless telecommunications, and it comprises optical line terminal, Optical Distribution Network, reaches a plurality of optical network units.Optical line terminal is disposed at local side and in order to send a descending light signal and to receive a uplink optical signal.Optical Distribution Network has the capable assembly of a ring of light and one the 1st, 2...n optical fiber, wherein n is the positive integer greater than 2, those optical fiber are to be connected in the capable assembly of this ring of light in regular turn, the 1st optical fiber is to be connected in this optical line terminal and to transmit those light signals, and those light signals that the capable assembly of this ring of light will come from one of those optical fiber are directed to next this optical fiber.Optical network unit is disposed at user's end respectively and is connected to the 2nd individually, ... n optical fiber, respectively this optical network unit is to receive to come from the pairing the 2nd, ... those light signals of n optical fiber, and pass the pairing the 2nd back after producing this uplink optical signal, ... n optical fiber, to should the 2nd, ... respectively this optical network unit of n-1 optical fiber is handled and is passed back in the pairing the 2nd this received descending light signal, ... n-1 optical fiber, at least one of those user's ends have a remote antenna, and these optical network unit system data that this remote antenna is received that are configured in this end of user with this remote antenna are incorporated in this uplink optical signal.
The belt assembly of aforementioned lights comprises one the 1st, 2 ... n circulator (circulator) and n photoconduction, those are the 1st years old, 2, ... by this n photoconduction institute articulating, those are the 1st, 2 years old between the n circulator, ... the outside of n circulator is distinctly to be connected in the 1st by light accordingly, 2 ... n optical fiber, each those circulator are those light signals from one of those light connections to be directed to next light connect.
Aforementioned fiber optic network unit comprises a low-density partial wave multiplexer, is that those separate optical signals that will receive become this uplink optical signal and this descending light signal.
Each aforementioned fiber optic network unit comprises the light shifter and first speculum.Light shifter is to receive those light signals.This light shifter is directed to those light signals this low-density partial wave multiplexer when being energized.This light shifter is directed to this first speculum with those light signals when being de-energized.This first speculum is with those these light shifters of light signal reflected back and to be guided back this optical network unit by this light shifter pairing the 2nd ... n optical fiber.
Respectively this optical network unit comprises one first optical coupler, one second speculum, reaches line receiver.This first optical coupler is to receive this descending light signal and general's difference to this second speculum and this time line receiver.This second speculum is reflection this first optical coupler of this descending optical return signal from this first optical coupler, and this time line receiver is then deciphered processing with this descending light signal.
Aforementioned second speculum is also replaceable to be fiber grating filter (Fiber Bragg Grating Filter).
Respectively this optical network unit comprises line receiver and up reflector.Should go up line receiver and be that to receive and change this uplink optical signal be a signal of telecommunication that receives, this up reflector then the signal of telecommunication of a signal of telecommunication to be uploaded and this reception is merged pass back after this uplink optical signal of back generation pairing the 2nd ... n optical fiber.
This up reflector that wherein is configured in this optical network unit of this user end with this remote antenna be data that this remote antenna is received, the signal of telecommunication to be uploaded, and the signal of telecommunication of this reception merge pass back after this uplink optical signal of back generation pairing the 2nd ... n optical fiber.
Aforementioned upward line receiver and up reflector constitute a up processing unit, and this up processing unit comprises photoelectric conversion component, are converted to one first signal of telecommunication in order to this uplink optical signal that will come from this corresponding optical fiber; The power splitter is to be one second signal of telecommunication and one the 3rd signal of telecommunication with this first signal of telecommunication difference; Digital processing controller (Digital Data and Control Processor) receives this second signal of telecommunication, and with it and signal of telecommunication merging back output one the 4th signal of telecommunication to be uploaded; First band pass filter is that the 3rd signal of telecommunication is carried out filtering, to allow the 3rd signal of telecommunication in a predetermined frequency band scope pass through to form one the 5th signal of telecommunication; Electric coupling is that coupling the 4th signal of telecommunication and the 5th signal of telecommunication form one the 6th signal of telecommunication; And the electric light transition components, be to be this uplink optical signal with the 6th electrical signal conversion.
This up processing unit that wherein is configured in this end of user with this remote antenna comprises a frequency shifter in addition, is that the data that this remote antenna is received are carried out shift frequency; One second band pass filter is that this is carried out filtering by frequency shift data, with allow in this predetermined frequency band scope this by frequency shift data by to form one the 7th signal of telecommunication; And a combiner, be in conjunction with forming one the 8th signal of telecommunication behind the 5th signal of telecommunication and the 7th signal of telecommunication, this electric coupling is coupling the 8th signal of telecommunication and the 4th signal of telecommunication and form the 6th signal of telecommunication.
Aforementioned digital processing controller comprises an analog digital transition components, is to be a digital signal with this second electrical signal conversion; One orthogonal frequency division multitask demodulator (OFDM Demodulator) is that this digital demodulation signal is become a restituted signal; One data access controller (Data Cache Memory and Access Control) is that this restituted signal and this signal of telecommunication to be uploaded are merged; One orthogonal frequency division multitask modulator (OFDM Modulator) is that this combined signal is carried out quadrature modulation; And a digital-to-analogue conversion assembly, be to be output as the 4th signal of telecommunication after this modulating signal is converted to analog signal.
Structure by the passive optical network system of the support wireless telecommunications of the invention described above, carry out the guiding of light signal with the capable assembly of the ring of light, be aided with the suitable design of optical network unit again, can make passive optical network system of the present invention be supported wireless telecommunications, and look each user's end and whether need support wireless telecommunications, and adjust the thin bilge construction of optical network unit.Make passive optical network system of the present invention more convenient and tool elasticity on using.In addition, owing to do not adopt the optical splitter device in the Optical Distribution Network of the present invention, so the intensity of the descending light signal that optical line terminal is sent will be unlikely to be cut into many parts by the optical splitter device, make optical line terminal be selected for use the moderate luminescence component of luminous intensity (laser), reduce the specification that part is selected for use.Moreover passive optical network system of the present invention only adopts the wavelength of a uplink optical signal and the wavelength of a downlink optical signal, so used the luminescence component (laser) of comparatively extensive use, whole construction cost is reduced.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the central office of existing broadband wireless access system and the system architecture schematic diagram between base station;
Fig. 2 is the optical line terminal of existing passive optical network system and the system architecture schematic diagram between optical network unit;
Fig. 3 is the configuration diagram according to the passive optical network system of support wireless telecommunications of the present invention;
Fig. 4 A is the configuration diagram according to first embodiment of optical network unit of the present invention;
Fig. 4 B is the configuration diagram according to second embodiment of optical network unit of the present invention;
Fig. 4 C is the configuration diagram according to the 3rd embodiment of optical network unit of the present invention;
Fig. 4 D is the configuration diagram according to the 4th embodiment of optical network unit of the present invention;
Fig. 5 A is the configuration diagram according to first embodiment of up processing unit of the present invention;
Fig. 5 B is the configuration diagram according to second embodiment of up processing unit of the present invention;
Fig. 5 C is the configuration diagram according to the 3rd embodiment of up processing unit of the present invention.
Fig. 5 D is the configuration diagram according to the 4th embodiment of up processing unit of the present invention;
Fig. 6 A is for being converted to behind the frequency domain spectrum diagram at a particular point in time according to first signal of telecommunication of the present invention;
Fig. 6 B is the enlarged drawing of Fig. 6 A in the 6B position;
Fig. 6 C is for being converted to behind the frequency domain spectrogram at a particular point in time according to the 5th signal of telecommunication of the present invention;
Fig. 7 is the configuration diagram according to another embodiment of the capable assembly of the ring of light of the present invention;
Fig. 8 is applied to support the configuration diagram of the passive optical network system of wireless telecommunications for another embodiment of the capable assembly of the ring of light of the present invention;
Fig. 9 A is the configuration diagram according to the 5th embodiment of optical network unit of the present invention;
Fig. 9 B is the configuration diagram according to the 6th embodiment of optical network unit of the present invention.
Wherein, Reference numeral
10 local sides
12a, 12b, 12c, 12m user's end
18a, the 18b remote antenna
19 internets
20 optical line terminals
22 base stations
30 Optical Distribution Networks
The capable assembly of 32, the 32 ' ring of light
320a, 320b, 320c, 320d, 320n the 1st, 2 ... the n circulator
322a, 322b, 322c, 322d photoconduction
34a, 34b, 34c, 34d, 34n the 1st, 2...n optical fiber
35 optical splitter devices
350 binding ends
352a, 352b, 352c, 352m the 1st, the 2...n-1 branch end
The signal of 36 orthogonal frequency division multitasks
360,362,364,368 passages
37a, 37b, 37k the 1st, the 2...n-2 optical coupler
370a, 370b, 370k merges end
372a, 372b, the 372k first difference end
374a, 374b, the 374k second difference end
39a, 39b, 39c, 39m the 1st, the 2...n-1 circulator
40a, 40b, 40c, 40m, 40p optical network unit
400 low-density partial wave multiplexers
402 light shifters
401 first speculums
403a first optical coupler
403b second optical coupler
404 fiber grating filters
405 times line receivers
406 up reflectors
Line receiver on 407
408 signals of telecommunication that receive
409 second speculums
410,411 difference ends
412 merge end
42a, 42b, 42c, 42m passes down
44a, 44b, 44c, the signal of telecommunication that 44m is to be uploaded
46 up processing units
460 photoelectric conversion components
461 power splitters
462 first band pass filters
463 electric couplings
465 frequency shifters
466 second band pass filters
467 combiners
464 electric light transition components
468 band stop filters
471,472,473,474 first, second, third and fourth signals of telecommunication
475,476,477,478 the 5th, six, seven, eight signals of telecommunication
48 digital processing controllers
480 analog digital transition components
481 orthogonal frequency division multitask demodulators
482 data access controllers
483 orthogonal frequency division multitask modulators
484 digital-to-analogue conversion assemblies
490 digital signals
491 restituted signals
492 combined signals
493 modulating signals
80 wireless datas
90 central offices
92a, the 92b base station
93a, the 93b special line
94 optical line terminals
96a, the 96b optical network unit
97 passive components
The light signal that λ d is descending
λ u uplink optical signal
Embodiment
Above explanation about description of contents of the present invention and following execution mode be in order to demonstration with explain spirit of the present invention and principle, and provide claim scope of the present invention further to explain.
At first, according to the present invention, the present invention is the passive optical network system of support wireless telecommunications.Wherein, the wireless telecommunications that the present invention can support can be but be not limited to frequency modulation, amplitude modulation, integration enfeoffment wireless service (GPRS, General Packet Radio Service) or global intercommunication microwave access (WiMAX, Worldwide Interoperability for Microwave Access) etc.The following description of the present invention is an example with global intercommunication microwave access (WiMAX) only.
And passive optical network system framework proposed by the invention is can provide various optical-fiber network agreement operations thereon.Such as but not limited to Ethernet, ATM, SONET.The following description of the present invention, only the ultrahigh speed passive optical network (OFDMA-GPON) with the orthogonal frequency division multitask is an example.But category of the present invention is not limited to this, so long as light access network (Optical Access Network or data access network) can be used.
Secondly, see also Fig. 3, it is the configuration diagram according to the passive optical network system of the support wireless telecommunications of first embodiment of the invention.Can see among the figure and know that this supports that the passive optical network system of wireless telecommunications is in order to holding 12a at a local side 10 (Central Office) with a plurality of users, 12b, 12c forms communication network between 12m (Base Station).Part user holds 12a, and 12c has remote antenna 18a, and 18b (Remote Antenna) that is to say to have at least a user to hold 12a, and 12c has a remote antenna 18a, 18b.
The passive optical network system of aforementioned support wireless telecommunications comprises optical line terminal 20 (Optical Line Terminal, OLT), Optical Distribution Network 30 (Optical Distribution Network, ODN), with a plurality of optical network unit 40a, 40b, 40c, 40m (Optical Network Units, ONU).
Aforementioned lights line terminal 20 can be but is not limited to support the optical line terminal 20 of OFDMA-GPON.Optical line terminal 20 is configured in local side 10. Optical network unit 40a, 40b, 40c, 40m then are disposed at those users respectively and hold 12a, 12b, 12c, 12m.Local side 10 disposes the base station 22 (Base Station) and the equipment that is connected internet 19 (Internet) in order to transmitting-receiving WiMAX wireless signal in addition.Optical line terminal 20 is a wired access interface (Wireline Access Interface), in order to holding 12a with this base station 22, user, 12b, 12c, 12m, and internet 19 (Internet) between form communication connection (Communication Link).Optical line terminal 20 is to be sent to Optical Distribution Network 30 with coming from the signal of base station 22 with internet 19 with descending light signal λ d, and will come from the uplink optical signal λ u decoding of Optical Distribution Network 30 and divide base station 22 or the internet 19 of delivering to correspondence.
Aforementioned internet 19 also can be general telephone network (public switched telephone network, PSTN, or title public switch telephone network).
Optical line terminal 20 by Optical Distribution Network 30 and with a plurality of optical network unit 40a, 40b, 40c, 40m form online (link) of single-point to multiple spot.Descending light signal λ d that optical line terminal 20 is sent or the uplink optical signal λ u that receives are the signals 36 for an orthogonal frequency division multitask.As can be seen from Figure 3, the trunnion axis of the signal 36 of this orthogonal frequency division multitask is the time, and vertical axis is a frequency.Wherein, point (promptly on same vertical line) at one time, the data that are transmitted comprise a plurality of channels 360,362,364,368 (Channel, i.e. frequency zone).Each passage 360,362,364,368 all can distinctly be used to transmit data.With Fig. 3 is example, and passage 360,364th is used to transmit data data (Data Channel).Channel 362 is used to transmit wireless data (RF Channel).Channel 368 is used for communications of control data (Control Channel).Each passage 360,362,364,368 data category that transmitted is can be by pre-defined (predetermined).Therefore, from foregoing as can be known, descending light signal λ d only adopts a kind of optical wavelength to transmit.In like manner, the wavelength of aforementioned descending light signal λ d also can only adopt a kind of wavelength to transmit, and need not to use the technology of high density partial wave multitask (DWDM, Density Wavelength Division Multiplexing) to transmit.Thus, can avoid the multitask of high density partial wave to need special laser also to need not accurately to control the wavelength of laser emitted light.Cost will greatly reduce.With the present embodiment is example, and the wavelength of the wavelength of aforementioned uplink optical signal λ u and aforementioned descending light signal λ d then is example with different.Such as but not limited to being the wavelength of the light signal λ d of row with 1490 nanometers (nm), with the wavelength of 1310 nanometers (nm) as uplink optical signal λ u.
The channel of the channel of aforementioned uplink optical signal λ u and aforementioned descending light signal λ d all by pre-defined and both be good with identical channel definition.The wavelength of the channel of aforementioned uplink optical signal λ u and aforementioned descending light signal λ d
Aforementioned lights distribution network 30 has the capable assembly 32 of a ring of light (Circulator Assembly) and one the 1st, 2...n optical fiber 34a, 34b, 34c, 34n, wherein n is the positive integer greater than 2, those optical fiber 34a, 34b, 34c, 34n is connected in the capable assembly 32 of this ring of light in regular turn, the 1st optical fiber is to be connected in this optical line terminal 20 and to transmit those light signals λ u, and λ d, the capable assembly 32 of this ring of light will come from those light signals λ u of (this is example with 34a) of those optical fiber, λ d is directed to next this optical fiber (hold example, next optical fiber of 34a is 34b).
The belt assembly 32 of aforementioned lights comprises one the 1st, and 2 ... n circulator 320a, 320b, 320c, 320n (circulator) and n photoconduction 322a, 322b, 322c, 322d (optical guide).Those the 1st, 2 ... n circulator 320a, 320b, 320c, between the 320n by this n photoconduction 322a, 322b, 322c, 322d institute articulating.Those the 1st, 2 ... n circulator 320a, 320b, 320c, the outside of 320n is distinctly to be connected (Opto-connected to) in the 1st, 2 by light accordingly ... n optical fiber 34a, 34b, 34c, 34n.Each those circulators 320a, 320b, 320c, 320n will be directed to next light from those light signals that those light connect (it is example that this light with circulator 320a connects 34a) of (Opto-connetion) to connect (hold routine, the next light of 34a is connected to 322a).
From foregoing as can be known, to be directed to next this optical fiber be expression (is example with Fig. 3) this optical fiber of the next one clockwise to circulator 320a, 320b, 320c, 320n those light signals that will come from one of those optical fiber.But not as limit.
About circulator 320a, 320b, 320c, the running of 320n, lifting circulator 320b again is that example is done an explanation.For circulator 320b, received light will be directed to next light with the clockwise direction shown in the drawing and be connected.That is to say that the light that comes from photoconduction 322a will be led to optical fiber 34b and export.The light that comes from optical fiber 34b will be led to photoconduction 322b and export.
The formed connection of material that the utilization that aforesaid light connection (Opto-connection) refers to can supply light to transmit thereon.For example with formed connections of material such as optical fiber, photoconductive tube, fiber waveguides.
Aforementioned those circulators 320a, 320b, 320c is connected 322a by this n light between the 320n, 322b, 322c, 322d institute articulating refer to those the 1st, 2...n circulator 320a, 320b, 320c, 320n are connected by light in regular turn and this n circulator 320n is connected in the 1st circulator 320a by light.That is to say the 1st, 2 circulator 320a, 320b is connected by the 1st light that 322a connects, the 2nd, 3 circulator 320b, and 320c is connected 322b by the 2nd light and connects.The rest may be inferred, n, and 1 circulator 320n, 320a is connected 322b by n light and connects.Connection described herein is meant that light connects (Opto-connecting), just connects in the optical fiber mode, is able to carry out the transmission of light via the light connection but get the two.The aforementioned lights connection can be adopted but be not limited to optical fiber, photoconductive tube or fiber waveguide.
Aforementioned those the 1st, 2 ... n circulator 320a, 320b, 320c, the outside refer to of 320n is at those circulators 320a, 320b, 320c, 320n is connected 322a, 322b, 322c by those light, behind the 322d institute articulating, each this circulator 320a, 320b, 320c, the outside of 320n.With circulator 320a is example, and optical fiber 34a position is the outside of this circulator 320a.In like manner, optical fiber 34b position is the outside of this circulator 320b.By that analogy.
Please consult Fig. 3 again, can see among the figure and know a plurality of optical network unit 40a, 40b, 40c, 40m are configured in a plurality of users respectively and hold 12a, 12b, 12c, 12m.The quantity of aforementioned optical network unit and user's end is m, wherein m=n-1.Those optical network units 40a, 40b, 40c, 40m be not connected to those the 2nd ... n optical fiber 34b, 34c, 34n, this optical network unit 40a respectively, 40b, 40c, 40m be receive come from pairing the 2nd ... n optical fiber 34b, 34c, those light signals λ u of 34n, λ d.To should the 2nd ... n-1 optical fiber 34b, 34c, respectively this optical network unit 40a of 34n, 40b, 40c, 40m handles and passes back pairing the 2nd to this received descending light signal λ d ... n-1 optical fiber 34b, 34c, 34n.This optical network unit 40a respectively, 40b, 40c, 40m produce in addition pass back behind this uplink optical signal λ u pairing the 2nd ... n optical fiber 34b, 34c, 34n.Be configured in this and have this remote antenna 18a, the user of 18b holds 12a, and this optical network unit 40a of 12c, 40c are with this remote antenna 18a, and the data transaction that 18b is received also is incorporated in this uplink optical signal λ u.
Aforementioned descending light signal λ d is by this optical network unit 40a respectively, 40b, 40c, 40m institute is received and processing after, pass back more pairing the 2nd ... n optical fiber 34b, 34c, 34n.For instance, optical network unit 40a receives the descending light signal λ d from optical fiber 34b, after handling, promptly passes this optical fiber 34b back.The aforementioned downlink optical signal λ d that is passed back is with identical by the downlink optical signal λ d that connects this.Aforementioned optical network unit 40a, 40b, 40c, 40m handles received downlink optical signal λ d, is that handle belongs to this optical network unit 40a, and 40b, 40c, the light signal of 40m separate under modulation and the general and pass 42a, 42b, 42c, 42m (Downstream).
Therefore, optical line terminal 20 is to send a descending light signal λ d to this Optical Distribution Network 30, and this descending light signal λ d is in regular turn through the 1st optical fiber 34a, the 1st optical circulator 320a, the 1st photoconduction 322a, the 2nd optical circulator 320b, the 2nd optical fiber 34b and arrive optical network unit 40a that should the 2nd optical fiber 34b.Optical network unit 40a then receives and handles descending light signal λ d.Secondly, the signal of telecommunication 44a that optical network unit 40a also will be to be uploaded with merge the back from the received data of remote antenna 18a and produce aforementioned uplink optical signal λ u and pass the 2nd optical fiber 34b again back.That is to say that the light signal of passing the 2nd circulator 320b through the 2nd optical fiber 34b back comprises descending light signal λ d and uplink optical signal λ u.
The 2nd circulator 320b is after receiving descending light signal λ d and uplink optical signal λ u, and what be about to is directed to photoconduction 322b, and in regular turn through the 3rd circulator 320c, be led to the optical network unit 40b of corresponding the 3rd optical fiber 34c with the 3rd optical fiber 34c.
Optical network unit 40b receives, handles and pass back this descending light signal λ d.Optical network unit 40b merges the uplink optical signal λ u that receives and signal of telecommunication 44b to be uploaded becomes new uplink optical signal λ u, passes the 3rd optical circulator 320c again back.Therefore, the light signal that is transmitted back to the 3rd optical circulator 320c from optical network unit 40b comprises descending light signal λ d and uplink optical signal λ u.
Through the 3rd and the 4th circulator 320c, the effect of 320d, the aforementioned light signal λ d that comes from optical network unit 40b, λ u will be transferred into optical network unit 40c.Optical network unit 40c carries out as hereinbefore processing to received downlink optical signal λ d, repeats no more.Optical network unit 40c back the 4th circulator 320d of passing with signal of telecommunication 44c to be uploaded and from received another the new uplink optical signal λ u of data merging back generation of remote antenna 18b again after receiving uplink optical signal λ u.
As seen from the above description, optical network unit 40a, 40b, 40c, the effect of 40m is similar, all descending light signal λ d need be handled, with one's own data down transmission 42a, 42b, 42c, and returns descending light signal λ d at 42m.In addition, for uplink optical signal λ u, signal of telecommunication 44a that then will be to be uploaded, 44b, 44c, 44m are incorporated in received uplink optical signal λ u.If this optical network unit 40a, 40c disposes remote antenna 18a, and 18b, this optical network unit 40a, 40c then will be incorporated in uplink optical signal λ u from the received data of remote antenna 18b in addition.
Last optical network unit 40m is owing to there is no next optical network unit, so need not to pass uplink optical signal λ u back n optical fiber 34n, all the other are identical with aforementioned optical network unit 40b, repeat no more.
Continuous Fig. 4 A that sees also, it is the configuration diagram according to first embodiment of optical network unit of the present invention.Can see among the figure and know, optical network unit 40c comprises low-density partial wave multiplexer 400 (CWDM, Coarse Wavelength Division Multiplexer), be those light signals λ u that will receive, λ d is separated into this uplink optical signal λ u and this descending light signal λ d.
Before the receiving terminal of low-density partial wave multiplexer 400, optical network unit 40c comprises a light shifter 402 (Optical Switch) and one first speculum 401 (Mirror) in addition.Light shifter 402 is to receive those light signals λ u, λ d.With those light signals λ u, λ d is directed to low-density partial wave multiplexer 400 to light shifter 402 when being energized.Light shifter 402 is when being de-energized, and with those light signals λ u, λ d is directed to first speculum 401.401 of first speculums are those light signals λ u, and this light shifter 402 of λ d reflected back is also guided back this optical network unit 40c pairing the 4th optical fiber 34d by this light shifter 402.The configuration of the light shifter 402 and first speculum 401 thus makes when the pairing user of this optical network unit 40c holds 12c to produce outage, still can pass up and descending light signal back Optical Distribution Network 30, does not cause the communication of whole system influenced.Though optical network unit 40c of the present invention has the light shifter 402 and first speculum 401, also this two assembly can be omitted, still can reach purpose of the present invention.
Then at the processing of downlink optical signal λ d, optical network unit 40c includes the first optical coupler 403a, a fiber grating filter 404 (Fiber Bragg Grating Filter) in addition, reaches line receiver 405.This first optical coupler 403a be receive this descending light signal λ d and will descending light signal λ d difference to this fiber grating filter 404 and this time line receiver 405.This fiber grating filter 405 is that this descending light signal λ d that reflects from this first optical coupler returns this first optical coupler 403a.Thus, descending light signal promptly then is guided light echo distribution network 30 (the 4th optical fiber 34d).405 of following line receivers are deciphered processing with this descending light signal λ d.It is after descending light signal λ d will decipher that decoding is herein handled, and following line receiver 405 judges whether decoding back data belong to the data of this optical network unit 40c.Following line receiver 405 is abandoned the data of non-optical network unit 40c, and the data that will belong to this optical network unit 40c descended to pass 42m.
Fiber grating filter 404 is a kind of optical fiber with Bragg mirror (Bragg Reflector), makes this optical fiber be able to the light of specific wavelength is reflected, and remaining passes through.With the present invention is example, and the fiber grating filter 404 of optical network unit 40c mainly is that the wavelength with descending light signal λ d is reflected, and with the wavelength of non-descending light signal λ d give by, abandon after just deriving.
Then, for the processing of uplink optical signal λ u, optical network unit 40c comprises line receiver 407 and up reflector 406.Line receiver 407 constitutes a up processing unit 46 with up reflector 406 on this.Last line receiver 407 is to receive and change the signal of telecommunication 408 that this uplink optical signal λ u is a reception.The signal of telecommunication 44c that 406 of up reflectors will be to be uploaded and the signal of telecommunication of this reception 408 merge passes pairing the 4th optical fiber 34d back after the back produces this uplink optical signal λ u.Because the user that optical network unit 40c is configured holds 12c to have remote antenna 18b, therefore, the up reflector 406 of optical network unit 40c be data that this remote antenna 18b is received, signal of telecommunication 44c to be uploaded, and the signal of telecommunication 408 of this reception merge and pass pairing the 4th optical fiber 44e back after the back produces this uplink optical signal λ u.
Aforementioned optical network unit 40c comprises one second optical coupler 403b in addition.The second optical coupler 403b has two difference ends 410,411 and and merges end 412.Merging end 412 is to receive this uplink optical signal λ u that comes from this corresponding optical fiber.410,411 out of the ordinary connections of two difference ends should be gone up line receiver 407 and this up reflector 406.Optical coupler 403a, 403b are in order to will being two parts from the light difference that merges end 412, and transfer out from difference end 410,411 respectively.In addition, when light sent from difference end 410,411, light transferred out after will being led to and merging end 412.
Though Fig. 4 A is to be example with optical network unit 40c, each optical network unit 40a, 40b, 40c, 40c all can adopt this framework.That is to say that this optical network unit 40c is the optical network unit of a complete function.It comprises the descending light signal λ d of processing, handles uplink optical signal λ u, merges signal of telecommunication 44c to be uploaded and processing and merging from the received data of remote antenna 18b.Optical network unit 40a for corresponding the 2nd optical fiber 34b, because its received light signal only comprises descending light signal λ d, there is no uplink optical signal λ u,, also can not produce the signal of telecommunication 408 of reception so line receiver 407 will not have uplink optical signal λ u and enter on it.
Secondly, be example with the optical network unit 40b of corresponding the 3rd optical fiber 34c because pairing user end there is no remote antenna 18a, 18b, so up reflector 406 be to need not merging from remote antenna 18a, the data that 18b is received.
Be example with last optical network unit 40m again, because its no remote antenna 18a, 18b, also there is not next optical network unit 40a, 40b, 40c, 40m, therefore optical network unit 40m need not to merge from remote antenna 18a, the data that 18b is received, and need not descending light signal λ d passback.
Though the above-mentioned different users of being configured in holds 12a, 12b, 12c, the optical network unit 40a of 12m, 40b, 40c, 40m all can adopt the framework as the optical network unit 40c of Fig. 4 A, but the present invention holds 12a at the different users, 12b, 12c in addition, the demand of 12m proposes different optical network unit 40a, 40b, 40c, the framework of 40m.
Please refer to Fig. 4 B, be configuration diagram according to second embodiment of optical network unit of the present invention.This optical network unit 40a is that the user who can be applicable to corresponding the 2nd optical fiber holds 12a.Because this user holds 12a to have remote antenna 18a, but can not receive uplink optical signal λ u, so optical network unit 40a has promptly omitted last line receiver 407.Its 406 of up reflector will be to be uploaded signal of telecommunication 44a conversion and produce uplink optical signal λ u after pass the 2nd optical fiber 34b back.In addition, optical network unit 40a has not had aforesaid fiber grating filter 404, but replaces with second speculum 409.This speculum 409 is that this descending light signal λ d that reflects from this first optical coupler 403a returns this first optical coupler 403a.405 of following line receivers are deciphered processing with this descending light signal λ d as aforementioned.
This sentences second speculum 409 and replaces fiber grating filter 404, and its difference is that second speculum 409 is reflected the light of all wavelengths, and fiber grating filter 404 then is the reflection certain wavelengths.Both are good with fiber grating filter 404.
Then, see also Fig. 4 C.It is the configuration diagram according to the 3rd embodiment of optical network unit of the present invention.This optical network unit 40b is similar to another optical network unit 40c framework.Difference is in the up reflector 406 of this optical network unit 40b and need not remote antenna 18a, and the data of 18b are incorporated in uplink optical signal λ u.
Please refer to Fig. 4 D and read it in the lump, it is the configuration diagram according to the 4th embodiment of optical network unit of the present invention.This optical network unit 40m holds 12m applicable to the user of corresponding last optical fiber (n optical fiber) 34n.As mentioned above, this optical network unit 40m need not to return descending light signal λ d, so do not possess aforementioned first optical coupler 403a and fiber grating filter 404 is not arranged.All the other are identical with optical network unit 40c, so repeat no more.
Moreover, please refer to Fig. 5 A, it is the configuration diagram according to first embodiment of up processing unit of the present invention.Up processing unit 46 comprises photoelectric conversion component 460 (Photo receiver), power splitter 461 (power splitter), digital processing controller 48 (Digital Data and Control Processor), first band pass filter 462 (Band Pass Filter), electric coupling 463, frequency shifter 465 (Frequency shifter), second band pass filter 466, combiner 467 (Combiner) and electric light transition components 464 (DML, directly-modulated laser).
Photoelectric conversion component 460 is converted to one first signal of telecommunication 471 in order to this uplink optical signal λ u that will come from this corresponding optical fiber.Please refer to Fig. 6 A, it is for being converted to the spectrum diagram of frequency domain (Frequency Domain) at a particular point in time according to first signal of telecommunication 471 of the present invention.This first signal of telecommunication 471 is to be that example is tested the spectrogram that gets with aforementioned ultrahigh speed passive optical network (OFDMA-GPON).Trunnion axis is a frequency among the figure, and unit is Gbps (109bits per second), and vertical axis then is a signal strength signal intensity, and unit is power (dBm).Can see among the figure and know, total frequency band of first signal of telecommunication 471 (total frequency range) can for but be not limited to 0.1 to 2.5Gbps.First signal of telecommunication 471 has kept a predetermined frequency band and has used as the transmission of wireless signal, and promptly frequency is in 2.25 to 2.3Gbps interval.The decision of this predetermined frequency band (also can be described as radio band) at this, visual user's needs and adjusting.Frequency band outside this predetermined frequency band (be 0.1G to 2.25G, 2.3G is to 2.5G) then can be used to transmit data or control data (hereinafter to be referred as frequency ranges of data).In this figure, there is an intensity strong and near the wireless data 80 of 2.25Gbps position, this wireless data is merged with frequency ranges of data at the predetermined frequency band section as can be seen.The data that are used in the frequency ranges of data are to transmit in the mode of orthogonal frequency division multitask.
Fig. 6 B is the enlarged drawing of Fig. 6 A in the 6B position.Can obviously find out among the figure in order to the predetermined frequency band of transmission wireless data and in order to noiseless phenomenon (Interference) between the frequency ranges of data of transmission data and control data.
Power splitter 461 (power splitter) is one second signal of telecommunication 472 and one the 3rd signal of telecommunication 473 (also can be described as the signal of telecommunication of difference) with this first signal of telecommunication difference.This second signal of telecommunication 472 is identical with first signal of telecommunication 471 with the waveform of the 3rd signal of telecommunication 473, only intensity a little less than.Both intensity is all approximately near a half intensity of first signal of telecommunication 471.Certainly, the intensity rate of second signal of telecommunication 472 and the 3rd signal of telecommunication 473 also can be set at a particular value, as 1: 1, and 3: 2 etc.
First band pass filter 462 is that the 3rd signal of telecommunication 473 is carried out filtering, to allow the 3rd signal of telecommunication 473 in aforementioned predetermined frequency band scope pass through to form one the 5th signal of telecommunication 475.Please refer to Fig. 6 C, it is for be converted to behind the frequency domain spectrogram at a particular point in time according to the 5th signal of telecommunication 475 of the present invention.Can see among the figure that the signal that is positioned at the frequency ranges of data interval is all filtered, then still be retained at the signal of predetermined frequency band.In this example, have three wireless datas in the predetermined frequency band and estimate to be uploaded (is different examples with Fig. 6 A).Through the effect of first band pass filter 462 thus, make that the intensity of wireless data is obviously high with respect to the intensity of frequency ranges of data.So can reduce the noise (being detailed later) of subsequent coupling.
Aforementioned frequency shifter 465 is that the data that this remote antenna 18b is received are carried out shift frequency.The action of this shift frequency is that the data frequency that remote antenna 18b receives is moved in the scope of aforementioned predetermined frequency band, and not with the 3rd signal of telecommunication 473 that receives in wireless data place frequency location overlapping, disturb in order to avoid produce.Frequency shifter 465 herein can be taked predetermined in advance, the artificial mode of adjusting.Meaning promptly when whole passive optical network system is installed, promptly configures each remote antenna 18a, and 18b will be by the frequency of shift frequency.So can avoid overlapping problem.In addition, also can adopt the wireless data place frequency location in real-time detection the 3rd signal of telecommunication 473, the frequency of the required shift frequency of automatic setting frequency shifter again, though this kind practice intelligence comparatively, relatively, cost is also higher.
Second band pass filter 466 is that this is carried out filtering by frequency shift data, with allow in this predetermined frequency band scope this by frequency shift data by to form one the 7th signal of telecommunication 477.This 7th signal of telecommunication 477 will only have a wireless data and be positioned at this predetermined frequency band scope.
Then, combiner 467 promptly forms one the 8th signal of telecommunication 478 in conjunction with the 5th signal of telecommunication 475 and the 7th signal of telecommunication 477 backs.That is to say that the wireless data with this optical network unit 40c is incorporated in from the wireless data among the uplink optical signal λ u of previous optical network unit 40b, and both and be unlikely to have interference cases to produce.
Moreover, with additional, be to finish about the reservation of data in the frequency ranges of data by digital processing controller 48.Digital processing controller 48 receives this second signal of telecommunication 472 and it is merged the back with a signal of telecommunication 44c to be uploaded and exports one the 4th signal of telecommunication 474 (also can claim merge the signal of telecommunication).Aforementioned signal of telecommunication 44c to be uploaded is received and is temporary in the buffer by digital processing controller 48.Digital processing controller 48 is to separate modulation with the orthogonal frequency division multitask mode again behind second signal of telecommunication, the 472 revolving die analog signals.Then, digital processing controller 48 merges the signal of telecommunication 44c to be uploaded in the buffer with second signal of telecommunication 472 of being separated modulation.Digital processing controller 48 is continuous to be output as the 4th signal of telecommunication 474 after merged signal is intended with orthogonal frequency division multitask mode modulation and revolving die.Thin bilge construction and function about digital processing controller 48 are detailed later.
Electric coupling 463 is that coupling the 8th signal of telecommunication 478 forms the 6th signal of telecommunication 476 with the 4th signal of telecommunication 474.Because digital processing controller 48 is in order to the data in the deal with data frequency band, the 8th signal of telecommunication 478 then only has the data of predetermined frequency band (radio band), therefore, after electric coupling 463 merges the 8th signal of telecommunication 478 and the 4th signal of telecommunication 474, promptly intactly will add (merging) in the uplink optical signal that receives (the 6th signal 476 still is the signal of telecommunication) from data and the data 44c to be uploaded that remote antenna 18b receives.
Electric light transition components 464 is that the 6th signal of telecommunication 476 is converted to this uplink optical signal λ u.
Aforesaid electric coupling 463 is a directivity electric coupling (Directional Coupler), forms the 6th signal of telecommunication 476 in order to directivity ground coupling the 8th signal of telecommunication 478 with the 4th signal of telecommunication 474.Aforementioned electric light transition components 464 can be selected for use and be produced the laser with uplink optical signal λ u wavelength.The frequency range of this laser need satisfy the specification of this passive optical network system.Aforementioned photoelectric conversion component 464 is to can be an optical inductor (photo sensor).
In addition, above-mentioned digital processing controller 48 comprises analog digital transition components 480 (Analog to Digital Converter), orthogonal frequency division multitask demodulator 481 (OFDM Demodulator), data access controller 482 (Data Cache Memory and Access Control), orthogonal frequency division multitask modulator 483 (OFDM Modulator) and digital-to-analogue conversion assembly 484 (Digital to Analog Converter).
Analog digital transition components 480 is that this second signal of telecommunication 472 is converted to a digital signal 490.Just transfer received uplink optical signal λ u to the up signal of telecommunication.Then, 481 of orthogonal frequency division multitask demodulators are separated this digital signal 490 and are tuned as a restituted signal 491.Data access controller 482 signal of telecommunication 44c that this restituted signal 491 and this is to be uploaded merges formation combined signal 492.Orthogonal frequency division multitask modulator 483 is this combined signal 492 to be carried out quadrature modulation form modulating signal 493.Digital-to-analogue conversion assembly 484 is to be output as the 4th signal of telecommunication 474 after this modulating signal 493 is converted to analog signal.
From foregoing as can be known, second signal of telecommunication 472 has also comprised the data of radio band except the data that comprise frequency ranges of data.Though digital processing controller 48 is only handled with additional the data of data frequency band, but the signal of radio band still may be when electric coupling 463 be coupled, stacked with the wireless data of the 8th signal of telecommunication, so can consider that elder generation is with the target signal filter of radio band before digital processing controller 48 receives second signal of telecommunication 472.This embodiment please refer to Fig. 5 B, and it is the configuration diagram for second embodiment of foundation up processing unit 46 of the present invention.Can see among the figure and know, be to have a band stop filter 468 (band stop filter or notch filter) before digital processing controller 48.This band stop filter 468 in order to 472 of this second signals of telecommunication after this predetermined frequency band (radio band) carries out frequency band resistance but, send this digital processing controller 48 again to.In other words, 468 of this band stop filters allow 472 signals in the frequency ranges of data interval of second signal of telecommunication pass through.
First or second embodiment of aforementioned up processing unit 46 (Fig. 5 A and Fig. 5 B) is to hold 12a applicable to the position the different users, 12b, the optical network unit 40a of 12c, 40b, 40c, 40m.Though part optical network unit 40b, 40m does not possess remote antenna 18a, 18b, but still can use this up processing unit 46, difference is that the frequency shifter 465 and second band pass filter 466 do not act on.
In order to be suitable for not having remote antenna 18a, the user of 18b holds 12b, and the user proposes the 3rd embodiment of up processing unit 46.Please refer to Fig. 5 C.Can see from figure and know that first band pass filter 462 is that the 3rd signal of telecommunication 473 is carried out filtering, to allow the 3rd signal of telecommunication 473 in aforementioned predetermined frequency band scope pass through to form one the 5th signal of telecommunication 475.463 couplings of electric coupling the 4th signal of telecommunication 474 forms the 6th signal of telecommunication 476 with the 5th signal of telecommunication 475.Thus, can reach the function and the purpose of up processing unit 46.
Then, see also Fig. 5 D, it is the configuration diagram for the 4th embodiment of foundation up processing unit of the present invention.This up processing unit 46 is the optical network unit 40a that can be applicable to be connected in the 2nd optical fiber 34b.Because this optical network unit 40a there is no uplink optical signal λ u from the received light signal of the 2nd optical fiber 34b, so can omit some assembly from first and second embodiment of Fig. 5 A or Fig. 5 B.Can see that from figure knowing this up processing unit 46 comprises digital processing controller 48, second band pass filter 466, frequency shifter 465, electric coupling 463, reaches electric light transition components 464.The annexation and the start of each inter-module repeat no more now.
The 4th embodiment of the up processing unit of above-mentioned Fig. 5 D is the optical network unit 40a that is applied to connect the 2nd optical fiber 34b, and this optical network unit 40a just is configured with remote antenna 18a, so with the embodiment of Fig. 5 D for it.Be not configured with remote antenna 18a if be connected in the optical network unit 40a of the 2nd optical fiber 34b, then second band pass filter 466 among Fig. 5 D, frequency shifter 465, all removable with electric coupling 463.
Though the embodiment of above-mentioned Fig. 5 D is with the structure simplified most for it, but the optical network unit 40a that is connected in the 2nd optical fiber 34b also first or second embodiment of the Full Featured optical network unit of apparatus (being Fig. 5 A or Fig. 5 B) realize.
As seen from the above description, the capable assembly 32 of the ring of light of the present invention does not adopt the optical splitter device, so the luminescence component of optical line terminal (laser) can be selected the moderate luminescence component of luminous intensity (laser) for use, reduces the specification that part is selected for use.
At last, see also Fig. 7, it is the configuration diagram according to another embodiment of the capable assembly of the ring of light of the present invention.The capable assembly 32 ' of this ring of light comprises an optical splitter device 35 (Optical Splitter), 1st, a 2...m circulator 39a, 39b, 39c, a 39m (being m ring device) and 1st, a 2...k optical coupler 37a, 37b, 37k (being k optical coupler).Wherein m is positive integer and the m=n-1 greater than 1.K is positive integer and the k=n-2 greater than zero.
Optical splitter device 35 has a binding end 350 and 1st, a 2... n branch end 352a, 352b, and 352c, 352m, 352n (meaning is a n branch end), this binding end 350 is to be connected to the 1st optical fiber 34a.Wherein n is the positive integer greater than 2.This optical splitter device 35 is to be directed to the 2nd after coming from this descending light signal λ d difference of the 1st optical fiber 34a ... n branch end 352b, 352c, 352n, and will be from the 2nd ... n branch end 352b, 352c, the uplink optical signal of 352n is directed to this binding end 350 after merging.
Each those the 1st, 2...k optical coupler 37a, 37b, 37k have one and merge end 370a, 370b, 370k, one first difference end 372a, 372b, 372k and one second difference end 374a, 374b, 374k.The 2nd ... m branch end 352b, 352c, 352m distinctly are connected to the 1st, 2...k optical coupler 37a, 37b, the first difference end 372a of 37k, 372b, 372k.This optical coupler 37a respectively, 37b, 37k are with from this first and second difference end 370a, 370b, and 370k, 372a, 372b, this light signal λ d of 372k is directed to this mergings after the λ u coupling and holds 370a, 370b, 370k.
Those the 1st, 2...m circulator 39a, 39b, 39c, 39m distinctly are connected to the 2nd, 3...n optical fiber 34b, 34c, 34d, 34n, the 1st circulator 39a is connected to the 1st branch end 352a, the 1st, 2 ... m-1 circulator 39a, 39b, 39c is connected to the 1st, 2...k optical coupler 37a, 37b, this of 37k second difference end 374a, 374b, 374k, the 1st, 2...k optical coupler 37a, 37b, the merging end 370a of 37k, 370b, 370k is connected to the 2nd ... m circulator 39b, 39c, 39m.M circulator 39m light in addition is connected to n branch end 352n.
Aforementioned the 1st circulator 39a is directed to the 2nd optical fiber 34b with this descending light signal λ d from the 1st branch end 352a, and this uplink optical signal λ u that will come from the 2nd optical fiber 34b is directed to the 2nd difference end 374a that is attached thereto, the 2nd, ... n-2 (being m-1) circulator 39b, 39c is this merging end 370a that is attached thereto coming from, those light signals λ d of 370b, λ u is directed to the 3rd, ... n-1 optical fiber 34c, 34e, and will come from the 3rd, ... n-1 optical fiber 34c, this uplink optical signal λ u of 34e is directed to this second difference end 374b that is attached thereto, 374c, this n-1 (i.e. m) circulator 39m will come from those light signals λ d of this merging end 370c that is attached thereto, and λ u is directed to this n optical fiber 34n, and will be directed to this n branch end 352n from this uplink optical signal λ u of this n optical fiber 34n.
By above-mentioned smooth annexation, will difference be n descending light signal λ d via optical splitter device 35 from the descending light signal λ d of the 1st optical fiber, and distinctly from the 1st, 2... n branch end 352a, 352b, 352c, 352m, 352n spreads out of.From the 1st, 2... n branch end 352a, 352b, 352c, 352m, the luminous intensity of the descending light signal λ d that 352n spread out of will than a little less than the luminous intensity of the descending light signal λ d that receives from binding end 350 many.
The descending light signal λ d that spreads out of from the 1st branch end 352a reaches the 2nd optical fiber via the 1st circulator 39a.The uplink optical signal λ u that passes back from the 2nd optical fiber will be reached to the 1st circulator 39a and will be led to the 1st optical coupler 37a.This moment, the first optical coupler 37a was about to reach the 2nd circulator 39b from the descending light signal λ d of the 2nd difference end 374a and the uplink optical signal λ u coupling back of the 1st difference end 372a by merging end 370a.Then the 2nd circulator is about to by merging the signal λ u that end 370a transmits, and λ d reaches the 3rd optical fiber 34c.From the signal λ u of the 3rd optical fiber 34c passback the described mode in top is reached k optical coupler 37k, m circulator 39m, a n optical fiber 34n in regular turn.
When n optical fiber passback uplink optical signal λ u, m circulator 39m is about to this uplink optical signal λ u and is directed to n branch end 352n.Splitter 35 was about to uplink optical signal λ u and conducted back the 1st optical fiber 34a this moment.
In addition, though be led to m circulator 39m from the descending light signal λ d of optical splitter device 35 difference to the n branch end 352n, but because m circulator 39m can't reach the signal from n branch end 352n the merging end 370k of k optical coupler 37k, so unlikelyly make descending light signal λ d mix with uplink optical signal λ u.
In Fig. 7, optical splitter device 35 directly will be from the descending light signal λ d difference of local side 10 and directly through optical coupler 37a, 37b, and 37k, circulator 39a, 39b, 39c, 39m and reach the 2nd ... n optical fiber 34b, 34c, 34d, 34n.Therefore, the 1st of the capable assembly 32 ' of the ring of light of collocation Fig. 7,2...m optical network unit 40a, 40b, 40c, 40m promptly need not to pass descending light signal λ d back, as m optical network unit 40m.
Application examples about the capable assembly 32 ' of the ring of light of Fig. 7 sees also Fig. 8, and it is the configuration diagram that another embodiment for the capable assembly of the ring of light of the present invention is applied to support the passive optical network system of wireless telecommunications.In Fig. 8, for avoiding graphic too complicated, now with the first difference end 372a, 372b, 372k, the second difference end 374a, 374b, merges end 370a at 374k, 370b, 370k, and branch end 352b, 352c, the label of 352m omits.Can see from Fig. 8 and to know that this passive optical network system comprises optical line terminal 20, Optical Distribution Network 30, and a plurality of optical network unit 40m, 40p, 40q.
Optical line terminal 20 is in order to send a descending light signal λ d and reception one uplink optical signal λ u.Optical Distribution Network has the capable assembly 32 ' of a ring of light and n optical fiber 34a, 34b, and 34c, 34d, 34n, wherein n is the positive integer greater than 2.Those optical fiber 34a, 34b, 34c, 34d, 34n are connected in the capable assembly 32 ' of this ring of light in regular turn.The 1st optical fiber 34a is connected in this optical line terminal 20 and transmits those light signals λ d, λ u.Optical network unit 40m, 40p, 40q distinctly are connected to the 2nd ... n optical fiber 34b, 34c, 34d, 34n.This optical network unit 40m respectively, 40p, 40q receive and handle those light signals λ d that comes from this optical fiber that is connected, λ u, and this uplink optical signal of generation λ u after pass back pairing the 2nd ... n optical fiber 34b, 34c, 34d, 34n.At least those optical network units 40m, 40p, one of 40q are configured with a remote antenna 18a, 18b is configured with this remote antenna 18a, this optical network unit 40p of 18b, 40q is with this remote antenna 18a, and the received data of 18b are incorporated in this uplink optical signal λ u.
Be applied to the optical network unit 40m in the passive optical network system of support wireless telecommunications of Fig. 8,40p, 40q have three kinds, and first kind is the optical network unit 40p of corresponding the 2nd optical fiber 34b.Corresponding the 2nd optical fiber 34b of second kind of right and wrong and do not dispose remote antenna 18a, the optical network unit 40m of 18b.Corresponding the 2nd optical fiber 34b of the third right and wrong but dispose the optical network unit 40q of remote antenna.
Wherein, the structure calcspar of above-mentioned first kind of optical network unit 40p sees also Fig. 9 A.Fig. 9 A is the configuration diagram for the 5th embodiment of foundation optical network unit of the present invention.The optical network unit of Fig. 9 A then is that to hold 12a be that example describes to the user with corresponding the 2nd optical fiber.This optical network unit just is configured with remote antenna 18a.This 5th embodiment (Fig. 9 A) is that with the difference of second embodiment (Fig. 4 B) the optical network unit 40p of the 5th embodiment need not the descending light signal λ d passback that will receive, and therefore, has saved speculum 409 (asking for an interview Fig. 4 B).This optical network unit 40p comprises light shifter 402, first speculum 401, low-density partial wave multiplexer 400, following line receiver 405 and up reflector 406.The annexation and the function of each inter-module then repeat no more.In addition, be not configured with remote antenna 18a if connect the optical network unit 40p of the 2nd optical fiber 34b, then the remote antenna 18a among Fig. 9 A will be omitted.
The framework of above-mentioned second kind of optical network unit 40m is as Fig. 4 D, so repeat no more.This optical network unit 40m is disposed at not have remote antenna 18a, and the user of 18b holds 12b, 12m.
The structural representation of above-mentioned the third optical network unit 40q please refer to Fig. 9 B.It is the configuration diagram for the 6th embodiment of foundation optical network unit of the present invention.This 6th embodiment phase comparatively the 5th embodiment then comprises the line receiver 407 and the second optical coupler 403b in addition.The action of inner each assembly of this optical network unit 40q in preamble chat and, repeat no more.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (31)

1. a passive optical network system of supporting wireless telecommunications is characterized in that, comprises:
One optical line terminal is in order to send a descending light signal and reception one uplink optical signal;
One Optical Distribution Network, has the capable assembly of a ring of light and one the 1st, 2...n optical fiber, wherein n is the positive integer greater than 2, those optical fiber are to be connected in the capable assembly of this ring of light in regular turn, the 1st optical fiber is to be connected in this optical line terminal and to transmit those light signals, and those light signals that the capable assembly of this ring of light will come from one of those optical fiber are directed to next this optical fiber; And
A plurality of optical network units, be connected to the 2nd individually, ... n optical fiber, respectively this optical network unit is to receive to come from the pairing the 2nd, ... those light signals of n optical fiber, and pass the pairing the 2nd back after producing this uplink optical signal, ... n optical fiber, to should the 2nd, ... respectively this optical network unit of n-1 optical fiber is handled and is passed back in the pairing the 2nd this received descending light signal, ... n-1 optical fiber, at least one of those optical network units are configured with a remote antenna, and this optical network unit that is configured with this remote antenna is that the data that this remote antenna is received are incorporated in this uplink optical signal.
2. the passive optical network system of support wireless telecommunications according to claim 1 is characterized in that, the wavelength of this uplink optical signal is for different with the wavelength of this descending light signal.
3. the passive optical network system of support wireless telecommunications according to claim 2, it is characterized in that, respectively this optical network unit comprises a low-density partial wave multiplexer, is that those separate optical signals that will receive become this uplink optical signal and this descending light signal.
4. the passive optical network system of support wireless telecommunications according to claim 3, it is characterized in that, respectively this optical network unit comprises a light shifter and one first speculum, this light shifter is to receive those light signals, this light shifter is directed to those light signals this low-density partial wave multiplexer when being energized, this light shifter is when being de-energized, those light signals are directed to this first speculum, this first speculum is with those these light shifters of light signal reflected back and to be guided back this optical network unit by this light shifter pairing the 2nd ... n optical fiber.
5. the passive optical network system of support wireless telecommunications according to claim 3, it is characterized in that, respectively this optical network unit comprises one first optical coupler, one second speculum, reaches line receiver, this first optical coupler be receive this descending light signal and with it difference to this second speculum and this time line receiver, this second speculum is reflection this first optical coupler of this descending optical return signal from this first optical coupler, and this time line receiver is then deciphered processing with this descending light signal.
6. the passive optical network system of support wireless telecommunications according to claim 3, it is characterized in that, respectively this optical network unit comprises one first optical coupler, a fiber grating filter, reaches line receiver, this first optical coupler be receive this descending light signal and with it difference to this fiber grating filter and this time line receiver, this fiber grating filter is reflection this first optical coupler of this descending optical return signal from this first optical coupler, and this time line receiver is then deciphered processing with this descending light signal.
7. the passive optical network system of support wireless telecommunications according to claim 1, it is characterized in that, this optical network unit that should the 2nd optical fiber is comprised a up reflector, and this up reflector is passed the 2nd optical fiber back with an electrical signal conversion to be uploaded and after producing this uplink optical signal.
8. the passive optical network system of support wireless telecommunications according to claim 7, it is characterized in that, connect the 3rd, ... this optical network unit of n optical fiber distinctly comprises a line receiver and a up reflector on one, should go up line receiver is to receive and change the signal of telecommunication that this uplink optical signal is a reception, this up reflector then the signal of telecommunication of a signal of telecommunication to be uploaded and this reception is merged the back produce pass back after this uplink optical signal pairing the 2nd ... n optical fiber.
9. the passive optical network system of support wireless telecommunications according to claim 8, it is characterized in that, this the up reflector that is configured with this optical network unit of this remote antenna be data that this remote antenna is received, the signal of telecommunication to be uploaded, and the signal of telecommunication of this reception merge the back produce pass back after this uplink optical signal pairing the 2nd ... n optical fiber.
10. the passive optical network system of support wireless telecommunications according to claim 8, it is characterized in that, respectively this optical network unit comprises one second optical coupler in addition, this second optical coupler has two difference ends and and merges end, this merging end is to receive this uplink optical signal that comes from this corresponding optical fiber, and this two differences end then distinctly connects should go up line receiver and this up reflector.
11. the passive optical network system of support wireless telecommunications according to claim 1 is characterized in that, respectively this optical network unit comprises:
One photoelectric conversion component is converted to one first signal of telecommunication in order to this uplink optical signal that will come from this corresponding optical fiber;
One power splitter is to be one second signal of telecommunication and one the 3rd signal of telecommunication with this first signal of telecommunication difference;
One digital processing controller receives this second signal of telecommunication, and with it and signal of telecommunication merging back output one the 4th signal of telecommunication to be uploaded;
One first band pass filter is that the 3rd signal of telecommunication is carried out filtering, to allow the 3rd signal of telecommunication in a predetermined frequency band scope pass through to form one the 5th signal of telecommunication;
One electric coupling is that coupling the 4th signal of telecommunication and the 5th signal of telecommunication form one the 6th signal of telecommunication; And
One electric light transition components is to be this uplink optical signal with the 6th electrical signal conversion.
12. the passive optical network system of support wireless telecommunications according to claim 11, it is characterized in that, respectively this optical network unit comprises a band stop filter in addition, and this band stop filter is after this second signal of telecommunication is carried out frequency band resistance but, to export to this digital processing controller.
13. the passive optical network system of support wireless telecommunications according to claim 12 is characterized in that, this band stop filter is that this second signal of telecommunication that will be positioned at this predetermined frequency band hinders but back output.
14. the passive optical network system of support wireless telecommunications according to claim 11 is characterized in that, this optical network unit that is configured with this remote antenna comprises in addition:
One frequency shifter is that the data that this remote antenna is received are carried out shift frequency;
One second band pass filter is that this is carried out filtering by frequency shift data, with allow in this predetermined frequency band scope this by frequency shift data by to form one the 7th signal of telecommunication; And
One combiner is in conjunction with forming one the 8th signal of telecommunication behind the 5th signal of telecommunication and the 7th signal of telecommunication, and this electric coupling is coupling the 8th signal of telecommunication and the 4th signal of telecommunication and form the 6th signal of telecommunication.
15. the passive optical network system of support wireless telecommunications according to claim 11 is characterized in that, this electric coupling is a directivity electric coupling.
16. the passive optical network system of support wireless telecommunications according to claim 11 is characterized in that, this photoelectric conversion component is to be an optical inductor.
17. the passive optical network system of support wireless telecommunications according to claim 11 is characterized in that, this digital processing controller comprises:
One analog digital transition components is to be a digital signal with this second electrical signal conversion;
One orthogonal frequency division multitask demodulator is that this digital demodulation signal is become a restituted signal;
One data access controller is that this restituted signal and this signal of telecommunication to be uploaded are merged;
One orthogonal frequency division multitask modulator is that this combined signal is carried out quadrature modulation; And
One digital-to-analogue conversion assembly is to be output as the 4th signal of telecommunication after this modulating signal is converted to analog signal.
18. the passive optical network system of support wireless telecommunications according to claim 1 is characterized in that, the capable assembly of this ring of light comprises one the 1st, 2 ... a n circulator and n photoconduction, those are the 1st years old, 2, ... by this n photoconduction institute articulating, those are the 1st, 2 years old between the n circulator, ... the outside of n circulator is distinctly to be connected in the 1st by light accordingly, 2 ... n optical fiber, each those circulator are those light signals from one of those light connections to be directed to next light connect.
19. a passive optical network system of supporting wireless telecommunications is characterized in that, comprises:
One optical line terminal is in order to send a descending light signal and reception one uplink optical signal;
One Optical Distribution Network has the capable assembly of a ring of light and n optical fiber, and wherein n is the positive integer greater than 2, and those optical fiber are to be connected in the capable assembly of this ring of light in regular turn, and the 1st optical fiber is to be connected in this optical line terminal and to transmit those light signals; And
A plurality of optical network units, distinctly be connected to the 2nd, ... n optical fiber, respectively this optical network unit be receive with handle those light signals of coming from this optical fiber that is connected, and this uplink optical signal of generation after pass the pairing the 2nd back, ... n optical fiber, at least one of those optical network units be configured with a remote antenna, this optical network unit that is configured with this remote antenna is that the data that this remote antenna is received are incorporated in this uplink optical signal.
20. the passive optical network system of support wireless telecommunications according to claim 19, it is characterized in that, respectively this optical network unit comprises a low-density partial wave multiplexer, is that those separate optical signals that will receive become this uplink optical signal and this descending light signal.
21. the passive optical network system of support wireless telecommunications according to claim 20, it is characterized in that, respectively this optical network unit comprises a light shifter and one first speculum, this light shifter is to receive those light signals, this light shifter is directed to those light signals this low-density partial wave multiplexer when being energized, this light shifter is when being de-energized, those light signals are directed to this first speculum, and this first speculum is to guide back this optical fiber that this optical network unit connects with those these light shifters of light signal reflected back and by this light shifter.
22. the passive optical network system of support wireless telecommunications according to claim 20, it is characterized in that, respectively this optical network unit comprises line receiver, and this time line receiver will be from deciphering processing in this descending light signal of this low-density partial wave multiplexer.
23. the passive optical network system of support wireless telecommunications according to claim 19, it is characterized in that, this optical network unit that connects the 2nd optical fiber comprises a up reflector, and this up reflector is passed the 2nd optical fiber back with an electrical signal conversion to be uploaded and after producing this uplink optical signal.
24. the passive optical network system of support wireless telecommunications according to claim 23, it is characterized in that, connect the 3rd, ... this optical network unit of n optical fiber distinctly comprises a line receiver and a up reflector on one, should go up line receiver is to receive and change the signal of telecommunication that this uplink optical signal is a reception, this up reflector then the signal of telecommunication of a signal of telecommunication to be uploaded and this reception is merged the back produce pass back after this uplink optical signal pairing the 2nd ... n optical fiber.
25. the passive optical network system of support wireless telecommunications according to claim 24, it is characterized in that, this the up reflector that is configured with this optical network unit of this remote antenna be data that this remote antenna is received, the signal of telecommunication to be uploaded, and the signal of telecommunication of this reception merge the back produce pass back after this uplink optical signal pairing the 2nd ... n optical fiber.
26. the passive optical network system of support wireless telecommunications according to claim 24, it is characterized in that, respectively this optical network unit comprises one second optical coupler in addition, this second optical coupler has two difference ends and and merges end, this merging end is to receive this uplink optical signal that comes from this corresponding optical fiber, and this two differences end then distinctly connects should go up line receiver and this up reflector.
27. the passive optical network system of support wireless telecommunications according to claim 19 is characterized in that, respectively this optical network unit comprises:
One photoelectric conversion component is converted to one first signal of telecommunication in order to this uplink optical signal that will come from this corresponding optical fiber;
One power splitter is to be one second signal of telecommunication and one the 3rd signal of telecommunication with this first signal of telecommunication difference;
One digital processing controller receives this second signal of telecommunication, and with it and signal of telecommunication merging back output one the 4th signal of telecommunication to be uploaded;
One first band pass filter is that the 3rd signal of telecommunication is carried out filtering, to allow the 3rd signal of telecommunication in a predetermined frequency band scope pass through to form one the 5th signal of telecommunication;
One electric coupling is that coupling the 4th signal of telecommunication and the 5th signal of telecommunication form one the 6th signal of telecommunication; And
One electric light transition components is to be this uplink optical signal with the 6th electrical signal conversion.
28. the passive optical network system of support wireless telecommunications according to claim 27, it is characterized in that, respectively this optical network unit comprises a band stop filter in addition, and this band stop filter is after this second signal of telecommunication is carried out frequency band resistance but, to export to this digital processing controller.
29. the passive optical network system of support wireless telecommunications according to claim 27 is characterized in that, this optical network unit that is configured with this remote antenna comprises in addition:
One frequency shifter is that the data that this remote antenna is received are carried out shift frequency;
One second band pass filter is that this is carried out filtering by frequency shift data, with allow in this predetermined frequency band scope this by frequency shift data by to form one the 7th signal of telecommunication; And
One combiner is in conjunction with forming one the 8th signal of telecommunication behind the 5th signal of telecommunication and the 7th signal of telecommunication, and this electric coupling is coupling the 8th signal of telecommunication and the 4th signal of telecommunication and form the 6th signal of telecommunication.
30. the passive optical network system of support wireless telecommunications according to claim 27 is characterized in that, this digital processing controller comprises:
One analog digital transition components is to be a digital signal with this second electrical signal conversion;
One orthogonal frequency division multitask demodulator is that this digital demodulation signal is become a restituted signal;
One data access controller is that this restituted signal and this signal of telecommunication to be uploaded are merged;
One orthogonal frequency division multitask modulator is that this combined signal is carried out quadrature modulation; And
One digital-to-analogue conversion assembly is to be output as the 4th signal of telecommunication after this modulating signal is converted to analog signal.
31. the passive optical network system of support wireless telecommunications according to claim 19 is characterized in that, the capable assembly of this ring of light comprises:
One optical splitter device, has an a binding end and n branch end, this binding end is that light is connected to the 1st optical fiber, wherein n is the positive integer greater than 2, this optical splitter device is to be directed to the 2nd after coming from this descending light signal difference of the 1st optical fiber, ... the n branch end, and will be from the 2nd ... after merging, this uplink optical signal of n branch end is directed to this binding end;
N-2 optical coupler, respectively this optical coupler has a merging end, one first difference end and one second difference end, those are the 2nd years old, ... the n-1 branch end is distinctly to be connected to the 1st, 2...n-2 the first difference end of optical coupler, respectively this optical coupler is to be directed to this merging end after this light signal coupling from this first and second difference end; And
N-1 circulator, those are the 1st years old, 2...n-1 circulator is distinctly to be connected to the 2nd, 3...n optical fiber, the 1st circulator is connected to the 1st branch end, the 1st, 2, ... the n-2 circulator is connected to the 1st, 2...n-2 this of optical coupler second difference end, the 1st, 2...n-2 this merging end of optical coupler is distinctly to be connected to the 2nd, ... the n-1 circulator, this n-1 circulator is to be connected to this n branch end, the 1st circulator is that this descending light signal from the 1st branch end is directed to the 2nd optical fiber, and this uplink optical signal that will come from the 2nd optical fiber is directed to the 2nd difference end that is attached thereto, the 2nd, ... the n-2 circulator is that those light signals that will come from this merging end that is attached thereto are directed to the 3rd, ... n-1 optical fiber, and will come from the 3rd, ... this uplink optical signal of n-1 optical fiber is directed to this second difference end that is attached thereto, and this n-1 circulator is that those light signals that will come from this merging end that is attached thereto are directed to this n optical fiber, and will be directed to this n branch end from this uplink optical signal of this n optical fiber.
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CN102546020A (en) * 2010-12-07 2012-07-04 财团法人工业技术研究院 Point-to-point optical network signal transmission method and system thereof
CN104243206A (en) * 2014-09-03 2014-12-24 烽火通信科技股份有限公司 System and method for realizing centralized configuration and management of ONU wireless functions
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US8098990B2 (en) * 2006-09-12 2012-01-17 Nec Laboratories America, Inc. System and method for providing wireless over a passive optical network (PON)

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CN102546020A (en) * 2010-12-07 2012-07-04 财团法人工业技术研究院 Point-to-point optical network signal transmission method and system thereof
CN102546020B (en) * 2010-12-07 2015-05-20 财团法人工业技术研究院 Point-to-point optical network signal transmission method and system thereof
CN103124198B (en) * 2011-11-17 2016-04-20 财团法人工业技术研究院 Optical wavelength division node
CN104243206A (en) * 2014-09-03 2014-12-24 烽火通信科技股份有限公司 System and method for realizing centralized configuration and management of ONU wireless functions
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CN104243206B (en) * 2014-09-03 2017-12-29 烽火通信科技股份有限公司 Realize the system and method to ONU radio function centralized configuration and managements

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