CN101351055B - WDM passive optical network system capable of supporting quadruple service conveying function - Google Patents
WDM passive optical network system capable of supporting quadruple service conveying function Download PDFInfo
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Abstract
The invention relates to a wavelength division multiplexing passive optical network system which supports quadruple service transmission function and belongs to the field of optical communication technology; wherein, after being transmitted through a first feeder fiber, optical signals output from an optical line terminal are sent to a multiplexing interface of a first arrayed waveguide grating in a node of a distal end; the de-multiplexing interface of the first arrayed waveguide grating is connected with an input interface of an optical network unit with corresponding wavelength channels; optical signals output from the output terminal of the optical network unit are sent into a de-multiplexing interface of a second arrayed waveguide grating with corresponding wavelength channels in the node of the distal end, are output by the multiplexing interface of the second arrayed waveguide grating and are transmitted into the optical line terminal through a second feeder fiber. The network system can realize the integration of quadruple services of wireless access, voice, video and data to the same wavelength division multiplexing passive optical network and can effectively reduce the allocation cost, optimize the system structure as well as provide diversified services for users.
Description
Technical field
What the present invention relates to is a kind of system of technical field of optical fiber communication, is specifically related to a kind of WDM passive optical network system of supporting quadruple service transmitting function.
Background technology
The quadruple service business is meant utilizes optical-fiber network to provide voice, video, data and four kinds of services of wireless access simultaneously for the user.Along with the fast development of wireless communication technology, the user more and more wishes the wireless access service easily and efficiently of can enjoying whenever and wherever possible.But because the wireless signal limited coverage area need be set up more wireless base station, cost is higher.Wireless access and voice, video, data, services are integrated in the same access network, can reduce deployment cost effectively, the optimization system structure, simultaneously can provide interactive service (upstream data access service), perhaps other various Terminal Service of deriving, as game on line/video conference etc., satisfy consumer's diversified demand.Wave division multiplexing passive optical network is a kind of emerging optical communication technique, bandwidth capacity is big, service quality is good, convenient management, cost is low, and it is good to the form and the speed transparency of light signal to transmit mesh portions, is easy to upgrading, broadband inserting service flexibly is provided, has been regarded as the best optical fiber access technology of Access Network of future generation.Utilize Wave division multiplexing passive optical network that wireless access is provided, the wireless signal production process of complexity can be concentrated on optical line terminal, and only wireless signal demodulation from light signal need be come out at optical network unit, get final product by the antenna emission, simplify the structure of wireless transmitting terminals greatly, reduced cost.Therefore integrated quadruple service business on the EPON platform is an attractive scheme.
Find by prior art documents, people such as Qingjiang Chang are published in the article " A PON System Providing Triple Play Service Based on a SingleDual-Parallel Mach-Zehnder Modulator " (based on the passive optical network that triple services are provided of single two parallel Mach zehnder modulators) that EuropeanConference on Optical Communication (ECOC Eeuropean Conference on Optical Communications) was numbered 4.4.6 in 2007, mention the transmission of adopting the mixed modulated code type to realize triple service business in this article.In this scheme, use two parallel Mach zehnder modulators to modulate three circuit-switched data, utilize the upper arm of two parallel Mach zehnder modulators that vision signal is modulated to the optical sub-carrier signal that light carrier suppresses, utilize underarm that data-signal and voice signal are modulated to amplitude shift keying/differential phase keying (DPSK) signal simultaneously, transmit thereby data, video and speech data be modulated on one road light carrier.But weak point is: 1, this scheme can't be transmitted the radiofrequency signal that is used for wireless access simultaneously; 2, all optical network units are shared the bandwidth of same optical channel.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of WDM passive optical network system of supporting quadruple service transmitting function is provided, based on sub-carrier modulation and mixed modulated code type technology, radio frequency signal adopts the differential phase keying (DPSK) modulation format of carrier suppressed, base band data adopts amplitude shift key modulation sign indicating number type, voice signal and vision signal adopt the differential phase keying (DPSK)/amplitude shift key modulation sign indicating number type of carrier suppressed, and its subcarrier frequency is different with the subcarrier frequency of radio frequency signal, is implemented in to transmit the quadruple service on one road light carrier simultaneously.Simultaneously, in optical network unit, a part of luminous power of differential phase keying (DPSK) light signal of carrier suppressed that is used to transmit radio frequency signal is as the carrier wave of upstream data, utilized by modulation once more, thereby saved the required light source of uplink, further reduced cost.
The present invention is achieved by the following technical solutions:
The present invention includes: optical line terminal, feeder line optical fiber, distant-end node and optical network unit, distant-end node comprises first array waveguide grating, second array waveguide grating, optical line terminal comprises triple service-transmitter, wavelength interleaver, the broadcast video transmitter, the upstream data receiver, 2 * 1 mixers and erbium-doped fiber amplifier, wherein: the output port of triple service-transmitter is connected with the input port of wavelength interleaver, first output port of wavelength interleaver links to each other with the first input end mouth of 2 * 1 mixers, second output port of wavelength interleaver is connected with the input port of broadcasting video data transmitter, second input port of its output port and 2 * 1 mixers links to each other, the output port of 2 * 1 mixers is connected with the input port of erbium-doped fiber amplifier, the output of erbium-doped fiber amplifier is through the first feeder line Optical Fiber Transmission, be sent to the multiplexing port of first array waveguide grating in the distant-end node, the demultiplexing port of first array waveguide grating is connected to the input port of the optical network unit of respective wavelength channel, the output port of optical network unit is connected to the demultiplexing port of the respective wavelength channel of second array waveguide grating in the distant-end node, the multiplexing port of second array waveguide grating is through the second feeder line optical fiber, links to each other with upstream data receiver in the optical line terminal.
Described triple service-transmitter produces the light signal of N road wavelength division multiplexing, carry radio frequency signal on the light signal of every road, voice signal and downlink data, triple service-transmitter comprise N laser, N integrated data modulator, N * 1 mixer, wherein: the output port of N laser links to each other with the input port of corresponding integrated data modulator respectively, the N of the output port of N integrated data modulator and N * 1 mixer corresponding input port is connected, N * 1 mixer output port is the output port of triple service-transmitter, the light signal that carries triple services of output wavelength division multiplexing.Wherein: N is a natural number, shows that laser, frequency mixer, modulator, optical network unit or the like part is one to one, and their quantity is consistent.
Described integrated data modulator is with radio frequency signal, voice signal and downlink data are modulated on one road light carrier, comprise single Mach zehnder modulators that drives, two Mach zehnder modulators that drives, two bipolar signal generators, (frequency is respectively f1 and f2 to two radio-frequency signal sources, and f1＞f2), two frequency mixers, a downlink data generator, wherein: be divided into identical two parts from the light signal of input port input, the input list drives a Mach zehnder modulators and two driving Mach zehnder modulators respectively, the first bipolar signal generator output end mouth links to each other with the first input end mouth of first frequency mixer, the output port of first radio-frequency signal source links to each other with second input port of first frequency mixer, the output port of first frequency mixer links to each other with single rf inputs mouth that drives the Mach zehnder modulators, the first bipolar signal generator is responsible for producing radiofrequency signal (frequency f 1) mixing mutually that radio service data and first radio-frequency signal source produce, obtain radio frequency signal, and be loaded on single Mach zehnder modulators that drives, thereby radio frequency signal is modulated to by singly driving on the light signal of Mach zehnder modulators, the second bipolar signal generator output end mouth links to each other with the first input end mouth of second frequency mixer, the output port of second radio-frequency signal source links to each other with second input port of second frequency mixer, the output port of second frequency mixer links to each other with two second rf inputs mouths that drive the Mach zehnder modulators, the second bipolar signal generator is responsible for producing radiofrequency signal (frequency f 2) mixing mutually that voice signal and second radio-frequency signal source produce, and be loaded on two Mach zehnder modulators that drive, thereby voice signal is modulated to by on two light signals that drive the Mach zehnder modulators, the output port of downlink data generator links to each other with two first rf inputs mouths that drive the Mach zehnder modulators, thereby downlink data also is modulated to by on two light signals that drive the Mach zehnder modulators, by single drive Mach zehnder modulators and two light signals that drive the Mach zehnder modulators and close the road after, output port output from the integrated data modulator promptly obtains carrying radio frequency signal, the light signal of voice signal and the triple services of downlink data.
Described broadcast video transmitter, comprise a flying-spot video generator, one first intensity modulator, wherein: first output port of the input port of first intensity modulator and wavelength interleaver links to each other, flying-spot video generator produces the rf inputs mouth that vision signal is sent into first intensity modulator, the output port of first intensity modulator is the output port of broadcast video transmitter, and the light signal of broadcast video signal is carried in output.
Described optical network unit, comprise the voice signal receiver, the broadcast video receiver, the downlink data receiver, the radio frequency signal receiver, second intensity modulator, the upstream data generator, optical filter, antenna and two 1 * 2 splitters, wherein: the input port of optical network unit links to each other with the input port of optical filter, first output port of optical filter links to each other with the input port of the one 1 * 2 splitter, first output port of the one 1 * 2 splitter links to each other with the voice signal receiver, second output port links to each other with the broadcast video receiver, second output port of optical filter links to each other with the downlink data receiver, the 3rd output port of optical filter links to each other with the input port of the 21 * 2 splitter, first output port of the 21 * 2 splitter links to each other with the input port of radio frequency signal receiver, the output port of radio frequency signal receiver links to each other with antenna, second output port of the 21 * 2 splitter links to each other with the input port of second intensity modulator, the upstream data that the upstream data generator produces is imported the rf inputs mouth of second intensity modulator, and the output port of second intensity modulator is the output port of optical network unit.
Described voice signal receiver, comprise one 1 bit delay interferometer, a photoelectric detector, wherein input optical signal links to each other with the input port of 1 bit delay interferometer, the output port of 1 bit delay interferometer links to each other with the input port of photoelectric detector, the bandwidth of photoelectric detector needs greater than speech signal bandwidth, less than 2 * f2.
Described radio frequency signal receiver, comprise one 1 bit delay interferometer, a photoelectric detector, wherein input optical signal links to each other with the input port of 1 bit delay interferometer, the output port of 1 bit delay interferometer links to each other with the input port of photoelectric detector, and the bandwidth of photoelectric detector needs greater than 2 * f1.
Operation principle of the present invention is as follows: each optical network unit takies different wavelength and communicates, thereby constitutes the EPON of wavelength division multiplexing.In the integrated data modulator, the radiofrequency signal that the radio service data that the first bipolar signal generator is produced and first radio-frequency signal source produce is carried out mixing, the subcarrier signal of telecommunication that obtains, it also is radio frequency signal, be loaded on single rf inputs mouth that drives the Mach zehnder modulators, can obtain the differential phase keying (DPSK) light signal of carrier suppressed.The radiofrequency signal that the voice signal that the second bipolar signal generator is produced and second radio-frequency signal source produce is carried out mixing, the subcarrier signal of telecommunication that obtains is loaded on two second rf inputs mouths that drive the Mach zehnder modulators, also the two interior light signal phase places of second arm that drive the Mach zehnder modulators of i.e. modulation can obtain double-side band differential phase keying (DPSK) light signal; Simultaneously, the downlink data that the downlink data generator is produced is loaded on two first rf inputs mouths that drive the Mach zehnder modulators, can change the light signal phase place in its first arm; At two outputs that drive the Mach zehnder modulators, the light signal of first, second arm interferes, phase place by light signal in the first arm that changes, can make the centered carrier of double-side band differential phase keying (DPSK) light signal in the interior light signal of the first arm and second arm offset or not offset, also promptly produce a nonreturn to zero code light signal by downlink data control.Then, single differential phase keying (DPSK) light signal that drives the carrier suppressed of carrying radio frequency signal of Mach zehnder modulators output, (two sidebands carry voice signal to a double-side band differential phase keying (DPSK) light signal that carries voice signal and downlink data of exporting with two driving Mach zehnder modulators, the center base band is carried downlink data) close the road, because the radio frequency signal frequency that first radio-frequency signal source and second radio-frequency signal source are produced is inequality, can not interact so close Lu Housan class data.Through N * 1 mixer, light signal on all N wavelength is coupled into an optical fiber, again by after the wavelength interleaver filtering, the sideband that carries voice signal in the light signal of N road (frequency is f2) is all exported from second output port, each road light signal is the differential phase keying (DPSK) form of carrier suppressed, input broadcast video transmitter, the intensity of light signal is modulated to carry broadcast video signal, but extinction ratio should maintain about 5dB～3dB, to keep the voice signal that the light signal phase place is carried.The light signal of first output port output of wavelength interleaver is carrying radio frequency signal and downlink data, the light signal of broadcast video transmitter output then carries voice signal and broadcast video signal, both are through 2 * 1 optical combiners, be coupled as one the tunnel, the input erbium-doped fiber amplifier amplifies in advance.
In optical network unit, the light signal of respective wavelength is divided into three the tunnel through optical filter is filtered, is respectively two pairs of sidebands (frequency f 1 and f2) and center base band of former light signal.Frequency is that the sideband of f2 is the differential phase keying (DPSK)/amplitude shift keying light signal of carrier suppressed, carrying voice signal and broadcast video signal, it is through the one 1 * 2 splitter, be divided into identical two ways of optical signals, one road input speech signal receiver demodulates voice signal from the light signal phase information; Another road input broadcast video receiver demodulates broadcast video signal from light signal strength information.Center base band light signal is the nonreturn to zero code light signal, directly imports the downlink data receiver, demodulates downlink data.Frequency is the sideband that carries radio frequency signal of f1, differential phase keying (DPSK) light signal for carrier suppressed, it is through the 21 * 2 splitter, be divided into identical two ways of optical signals, one tunnel input radio frequency signal receiver, from the light signal phase information, demodulate radio frequency signal, load on the antenna; Because the differential phase keying (DPSK) light signal of carrier suppressed has constant amplitude envelops, can directly insert the upstream data transmitter, carries out amplitude shift key modulation, obtains uplink optical signal, sends it back optical line terminal again.
Compared with prior art, the present invention has following beneficial effect: the present invention can transmit less radio-frequency, voice, video and data service simultaneously, use wavelength-division multiplex technique, for each user provides independently optical channel bandwidth, generally can reach more than the 2.5Gb/s, in integrated diversity service, guaranteed the service quality of each user's broadband high-speed, reduced overall cost.And can't transmit radio frequency signal in people's such as Qingjiang Chang the scheme, and light signal adopts the mode of broadcasting to be sent to all users, must share the bandwidth of an optical channel between the different users in time-multiplexed mode, the maximum 60Mb/s of each user, and need to use specific dispatching algorithm to avoid conflict, overall performance of network is restricted, and cost is higher.
Description of drawings
Fig. 1 is a network structure of the present invention;
Fig. 2 is for implementing the structure principle chart of single wavelength;
Fig. 3 is embodiment of the invention figure as a result;
Wherein: figure a is single Mach zehnder modulators output spectrum figure that drives, figure b is for reflecting the spectrogram of the center base band that obtains through the first Fiber Bragg Grating FBG filtering, figure c is the light signal spectrogram that carries the quadruple service of the 32 * 1 mixer output, figure d is two Mach zehnder modulators output spectrum figure that drive, the carrier suppressed phase shift keying light signal spectrogram of figure e for obtaining through the first Fiber Bragg Grating FBG filtering, figure f is the light signal eye pattern of second polarization beam apparatus, first output port output, figure g is the voice signal eye pattern that first photo-detector demodulates goes out, the broadcast video signal eye pattern that figure h demodulates for the broadcast video receiver, the downlink data eye pattern that figure i demodulates for the downlink data receiver, figure j is the light signal eye pattern of second polarization beam apparatus, second output port output, figure k is the light signal eye pattern of the 21 bit delay interferometer output, Fig. 1 is the radio service data eye pattern that second photo-detector demodulates goes out, figure m is the light signal eye pattern that carries upward signal of second intensity modulator output, the upstream data eye pattern that figure n upstream data receiver demodulates.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the WDM passive optical network system of the support quadruple service transmitting function of present embodiment, comprise: optical line terminal, feeder line optical fiber, distant-end node and optical network unit, distant-end node comprises first, second array waveguide grating, optical line terminal comprises triple service-transmitter, wavelength interleaver, the broadcast video transmitter, the upstream data receiver, 2 * 1 mixers and erbium-doped fiber amplifier, wherein: the output port of triple service-transmitter is connected with the input port of wavelength interleaver, first output port of wavelength interleaver links to each other with the first input end mouth of 2 * 1 mixers, second output port of wavelength interleaver is connected with the input port of broadcasting video data transmitter, second input port of its output port and 2 * 1 mixers links to each other, the output port of 2 * 1 mixers is connected with the input port of erbium-doped fiber amplifier, the output of erbium-doped fiber amplifier is through the first feeder line Optical Fiber Transmission, be sent to the multiplexing port of first array waveguide grating in the distant-end node, the demultiplexing port of first array waveguide grating is connected to the input port of the optical network unit of respective wavelength channel, the output port of optical network unit is connected to the demultiplexing port of the respective wavelength channel of second array waveguide grating in the distant-end node, the multiplexing port of second array waveguide grating is through the second feeder line optical fiber, links to each other with upstream data receiver in the optical line terminal.
Described triple service-transmitter produces the light signal of N road wavelength division multiplexing, carry radio frequency signal on the light signal of every road, voice signal and downlink data, triple service-transmitter comprise N laser, N integrated data modulator, N * 1 mixer, wherein: the output port of N laser links to each other with the input port of corresponding integrated data modulator respectively, the N of the output port of N integrated data modulator and N * 1 mixer corresponding input port is connected, N * 1 mixer output port is the output port of triple service-transmitter, the light signal that carries triple services of output wavelength division multiplexing.Wherein: N is a natural number, shows that laser, frequency mixer, modulator, optical network unit or the like part is one to one, and their quantity is consistent.
Described integrated data modulator is with radio frequency signal, voice signal and downlink data are modulated on one road light carrier, comprise single Mach zehnder modulators that drives, two Mach zehnder modulators that drives, two bipolar signal generators, (frequency is respectively f1 and f2 to two radio-frequency signal sources, and f1＞f2), two frequency mixers, a downlink data generator, wherein: be divided into identical two parts from the light signal of input port input, the input list drives a Mach zehnder modulators and two driving Mach zehnder modulators respectively, the first bipolar signal generator output end mouth links to each other with the first input end mouth of first frequency mixer, the output port of first radio-frequency signal source links to each other with second input port of first frequency mixer, the output port of first frequency mixer links to each other with single rf inputs mouth that drives the Mach zehnder modulators, the first bipolar signal generator is responsible for producing radiofrequency signal (frequency f 1) mixing mutually that radio service data and first radio-frequency signal source produce, obtain radio frequency signal, and be loaded on single Mach zehnder modulators that drives, thereby radio frequency signal is modulated to by singly driving on the light signal of Mach zehnder modulators, the second bipolar signal generator output end mouth links to each other with the first input end mouth of second frequency mixer, the output port of second radio-frequency signal source links to each other with second input port of second frequency mixer, the output port of second frequency mixer links to each other with two second rf inputs mouths that drive the Mach zehnder modulators, the second bipolar signal generator is responsible for producing radiofrequency signal (frequency f 2) mixing mutually that voice signal and second radio-frequency signal source produce, and be loaded on two Mach zehnder modulators that drive, thereby voice signal is modulated to by on two light signals that drive the Mach zehnder modulators, the output port of downlink data generator links to each other with two first rf inputs mouths that drive the Mach zehnder modulators, thereby downlink data also is modulated to by on two light signals that drive the Mach zehnder modulators, by single drive Mach zehnder modulators and two light signals that drive the Mach zehnder modulators and close the road after, output port output from the integrated data modulator promptly obtains carrying radio frequency signal, the light signal of voice signal and the triple services of downlink data.
Described broadcast video transmitter, comprise a flying-spot video generator, one first intensity modulator, wherein: first output port of the input port of first intensity modulator and wavelength interleaver links to each other, flying-spot video generator produces the rf inputs mouth that vision signal is sent into first intensity modulator, the output port of first intensity modulator is the output port of broadcast video transmitter, and the light signal of broadcast video signal is carried in output.
Described optical network unit, comprise the voice signal receiver, the broadcast video receiver, the downlink data receiver, the radio frequency signal receiver, second intensity modulator, the upstream data generator, optical filter, antenna and two 1 * 2 splitters, wherein: the input port of optical network unit links to each other with the input port of optical filter, first output port of optical filter links to each other with the input port of the one 1 * 2 splitter, first output port of the one 1 * 2 splitter links to each other with the voice signal receiver, second output port links to each other with the broadcast video receiver, second output port of optical filter links to each other with the downlink data receiver, the 3rd output port of optical filter links to each other with the input port of the 21 * 2 splitter, first output port of the 21 * 2 splitter links to each other with the input port of radio frequency signal receiver, the output port of radio frequency signal receiver links to each other with antenna, second output port of the 21 * 2 splitter links to each other with the input port of second intensity modulator, the upstream data that the upstream data generator produces is imported the rf inputs mouth of second intensity modulator, and the output port of second intensity modulator is the output port of optical network unit.
Described voice signal receiver, comprise one 1 bit delay interferometer, a photoelectric detector, wherein input optical signal links to each other with the input port of 1 bit delay interferometer, the output port of 1 bit delay interferometer links to each other with the input port of photoelectric detector, the bandwidth of photoelectric detector needs greater than speech signal bandwidth, less than 2 * f2.
Described radio frequency signal receiver, comprise one 1 bit delay interferometer, a photoelectric detector, wherein input optical signal links to each other with the input port of 1 bit delay interferometer, the output port of 1 bit delay interferometer links to each other with the input port of photoelectric detector, and the bandwidth of photoelectric detector needs greater than 2 * f1.
As shown in Figure 2, only implement to carry out in the single wavelength channel situation of muticast data transmission for embodiment.Wavelength is that the light carrier of 1549.89nm is divided into two-way by the 31 * 2 splitter, enters single Mach zehnder modulators and two Mach zehnder modulators that drives of driving respectively.1.25Gb/s the bipolarity radio service data passes through frequency mixer mixing mutually with the 16.25GHz radiofrequency signal, obtain electric subcarrier signal, also be radio frequency signal, be loaded on single rf inputs mouth that drives the Mach zehnder modulators, single Mach zehnder modulators that drives is biased in V π point.1.25Gb/s the bipolarity voice signal passes through frequency mixer mixing mutually with the 10GHz clock signal, two second prevention at radio-frequency port that drive the Mach zehnder modulators of electric subcarrier signal input that obtain, two first prevention at radio-frequency port that drive the Mach zehnder modulators of 1.25Gb/s unipolarity downlink data input.In the present embodiment, the filter action that comes the simulating wavelength interleaver with first polarization beam apparatus, first circulator, first Fiber Bragg Grating FBG and the 22 * 1 mixer.Single light signal that drives the output of Mach zehnder modulators is coupled as one road light signal through importing the one 2 * 1 mixer with two light signals that drive the output of Mach zehnder modulators behind the Polarization Controller.By regulating Polarization Controller, make single light signal and two light signal polarization state quadratures that drive the output of Mach zehnder modulators that drives the output of Mach zehnder modulators.After the light signal of the one 2 * 1 mixer output is imported first polarization beam apparatus, the light signal that polarization state is different is divided into two-way output, carry the carrier suppressed differential phase keying (DPSK) light signal of radio frequency signal and export, enter the first input end mouth of the 22 * 1 mixer from first output port; (two sidebands carry voice signal to carry the double-side band differential phase keying (DPSK) light signal of voice signal and downlink data, the center base band is carried downlink data) export from second output port of first polarization beam apparatus, enter first port of first circulator, then export first Fiber Bragg Grating FBG (centre wavelength 1549.89nm) to from its second port, the center base band of carrying downlink data in the light signal is reflected back toward second port of first circulator, and from the output of the 3rd port of first circulator, enter second input port of the 22 * 1 mixer, two sidebands that carry voice signal in the light signal are by first Fiber Bragg Grating FBG, import first intensity modulator, 1.25Gb/s broadcast video signal drives the first intensity modulator modulated light signal intensity, extinction ratio 3dB, the phase change of its output light signal is carried voice signal, and Strength Changes is carried broadcast video signal.The output of first intensity modulator and the output of the 22 * 1 mixer are coupled as one road light signal through the 32 * 1 mixer, at this moment, subcarrier frequency is that the sideband of 16.25GHz carries radio frequency signal in the light signal, subcarrier frequency is that the sideband of 10GHz carries voice signal and broadcast video signal, and the center base band is carried downlink data.After the erbium-doped fiber amplifier amplification, light signal enters the first long feeder line Optical Fiber Transmission of 12.5km, then enters first array waveguide grating.At the optical network unit end, the filter action of using second polarization beam apparatus, second circulator and second Fiber Bragg Grating FBG (centre wavelength 1549.89nm) to come the simulated light filter.Light signal through second polarization beam apparatus after, be divided into two-way, subcarrier frequency is that sideband and the center base band of 10GHz exported from first output port of second polarization beam apparatus, enter first port of second circulator, by second port output of second circulator, enter second Fiber Bragg Grating FBG again.After the filtering of light signal process Fiber Bragg Grating FBG, the center base band is reflected back toward second port of second circulator, subcarrier frequency is that the sideband of 10GHz is divided into two-way by grating and by the one 1 * 2 splitter: the one tunnel imports the one 1 bit delay interferometer, carrier suppressed phase shift keying codes type is converted into the carrier suppressed amplitude shift keying, then received, obtain voice signal by first photoelectric detector of 2.5GHz; Other one the tunnel directly imports the broadcast video receiver of 2.5GHz, obtains broadcast video signal.The center base band of second port of reflected back second circulator, the 3rd port output by second circulator is received by the downlink data receiver of 2.5GHz, obtains downlink data.The subcarrier frequency of exporting from second output port of second polarization beam apparatus is the sideband of 16.25GHz, be divided into two-way by the 21 * 2 splitter, one the tunnel imports the 21 bit delay interferometer, with carrier suppressed phase shift keying format conversion is carrier suppressed amplitude shift keying form, then should connect a high speed (after bandwidth＞32.5GHz) photoelectric detector is converted into the radio frequency signal that frequency is 32.5GHz, connect the antenna emission, but in order to observe the laser propagation effect of radio service data, second photoelectric detector that has connected low speed 2.5GHz herein receives, directly obtained radio service data, so that observe its eye pattern.Another road light signal is imported second intensity modulator, modulated by the 1.25Gb/s upstream data, the light signal of output enters the second feeder line Optical Fiber Transmission of 12.5km through second array waveguide grating, then received, obtain upstream data by the upstream data receiver of 2.5GHz.It is 2 that all data in the present embodiment are all used length
7-1 pseudo random sequence nonreturn to zero code.
As shown in Figure 3, be the figure as a result of present embodiment, wherein (a)～(e) longitudinal scale is every lattice 5dB, and (f)～(n) time width of eye pattern is 400ps.Fig. 3 (a) is single Mach zehnder modulators output spectrum figure (the A point among Fig. 2) that drives, and sideband frequency is spaced apart the carrier suppressed phase shift keying light signal of 32.5GHz, and sideband power exceeds 21dB than carrier wave.Fig. 3 (b) is for reflecting the spectrogram (the B point among Fig. 2) of the center base band that obtains through the first Fiber Bragg Grating FBG filtering.Fig. 3 (c) is the light signal spectrogram (the C point among Fig. 2) that carries the quadruple service of the 32 * 1 mixer output.Fig. 3 (d) is two Mach zehnder modulators output spectrum figure (the D point among Fig. 2) that drive, and can see that frequency is two sidebands of the carrier suppressed phase shift keying form of 10GHz, and the center base band.Fig. 3 (e) is spaced apart the carrier suppressed phase shift keying light signal spectrogram (the E point among Fig. 2) of 20GHz for the sideband frequency that obtains through the first Fiber Bragg Grating FBG filtering.Fig. 3 (f) is the eye pattern that carries voice signal, broadcast video signal and downlink data light signal (the F point among Fig. 2) of second polarization beam apparatus, first output port output, can see that its intensity has the higher-order of oscillation that frequency is 10GHz.Fig. 3 (g) is the voice signal eye pattern that first photo-detector demodulates goes out, and opening width is good, measures no error code.The broadcast video signal eye pattern that Fig. 3 (h) demodulates for the broadcast video receiver, opening width is good, measures no error code.The downlink data eye pattern that Fig. 3 (i) demodulates for the downlink data receiver, opening width is good, measures no error code.Fig. 3 (j) is the carrier suppressed phase shift keying light signal eye pattern that carries radio frequency signal (the G point among Fig. 2) of second polarization beam apparatus, second output port output, can see that its frequency is the higher-order of oscillation of 32.5GHz.Fig. 3 (k) is that the carrier suppressed that is converted into of the 21 bit delay interferometer output is reconsidered monitor optical signal eye diagram (the H point among Fig. 2).Fig. 3 (1) is the radio service data eye pattern that second photo-detector demodulates goes out, and opening width is good, measures no error code.Fig. 3 (m) is after modulating through second intensity modulator again, the light signal eye pattern that carries upward signal of output (the I point among Fig. 2), and extinction ratio is 10dB.The upstream data eye pattern that Fig. 3 (n) demodulates for the upstream data receiver, opening width is good, measures no error code.
Claims (7)
1. support quadruple to serve the WDM passive optical network system of transmitting function for one kind, it is characterized in that: comprising: optical line terminal, the first feeder line optical fiber, the second feeder line optical fiber, distant-end node and optical network unit, described distant-end node comprises first array waveguide grating, second array waveguide grating, described optical line terminal comprises triple service-transmitter, wavelength interleaver, the broadcast video transmitter, the upstream data receiver, 2 * 1 mixers and erbium-doped fiber amplifier, wherein: the output port of triple service-transmitter is connected with the input port of wavelength interleaver, first output port of wavelength interleaver links to each other with the first input end mouth of 2 * 1 mixers, second output port of wavelength interleaver is connected with the input port of broadcasting video data transmitter, second input port of the output port of broadcasting video data transmitter and 2 * 1 mixers links to each other, the output port of 2 * 1 mixers is connected with the input port of erbium-doped fiber amplifier, the output of erbium-doped fiber amplifier is through the first feeder line Optical Fiber Transmission, be sent to the multiplexing port of first array waveguide grating in the distant-end node, the demultiplexing port of first array waveguide grating is connected to the input port of the optical network unit of respective wavelength channel, the output port of optical network unit is connected to the demultiplexing port of the respective wavelength channel of second array waveguide grating in the distant-end node, the multiplexing port of second array waveguide grating is through the second feeder line optical fiber, links to each other with upstream data receiver in the optical line terminal;
Described triple service-transmitter comprises N laser, a N integrated data modulator, N * 1 mixer, wherein: the output port of N laser links to each other with the input port of corresponding integrated data modulator respectively, the N of the output port of N integrated data modulator and N * 1 mixer corresponding input port is connected, N * 1 mixer output port is the output port of triple service-transmitter, the light signal that carries triple services of output wavelength division multiplexing;
Described integrated data modulator comprises single Mach zehnder modulators that drives, two Mach zehnder modulators that drives, two bipolar signal generators, two radio-frequency signal sources, two frequency mixers, a downlink data generator, one 1 * 2 splitter, a Polarization Controller and one 2 * 1 mixer, wherein: two radiofrequency signal source frequencies are respectively f1 and f2, and f1＞f2, the light carrier that is sent by laser is divided into two-way by 1 * 2 splitter, enter single Mach zehnder modulators and two Mach zehnder modulators that drives of driving respectively, the first bipolar signal generator output end mouth links to each other with the first input end mouth of first frequency mixer, the output port of first radio-frequency signal source links to each other with second input port of first frequency mixer, the output port of first frequency mixer links to each other with single rf inputs mouth that drives the Mach zehnder modulators, it is the radiofrequency signal mixing mutually of f1 with the frequency that first radio-frequency signal source produces that the first bipolar signal generator is responsible for producing radio service data, obtain radio frequency signal, and be loaded on single Mach zehnder modulators that drives, thereby radio frequency signal is modulated to by singly driving on the light signal of Mach zehnder modulators, the second bipolar signal generator output end mouth links to each other with the first input end mouth of second frequency mixer, the output port of second radio-frequency signal source links to each other with second input port of second frequency mixer, the output port of second frequency mixer links to each other with two second rf inputs mouths that drive the Mach zehnder modulators, it is the radiofrequency signal mixing mutually of f2 with the frequency that second radio-frequency signal source produces that the second bipolar signal generator is responsible for producing voice signal, and be loaded on two Mach zehnder modulators that drive, thereby voice signal is modulated to by on two light signals that drive the Mach zehnder modulators, the output port of downlink data generator links to each other with two first rf inputs mouths that drive the Mach zehnder modulators, thereby downlink data also is modulated to by on two light signals that drive the Mach zehnder modulators, light signal input 2 * 1 mixers of exporting with pair driving Mach zehnder modulators behind the light signal process Polarization Controller of single driving Mach zehnder modulators output, be coupled as one road light signal, by regulating Polarization Controller, make single light signal and two light signal polarization state quadratures that drive the output of Mach zehnder modulators that drives the output of Mach zehnder modulators, by single drive Mach zehnder modulators and two light signals that drive the Mach zehnder modulators and close the road after, output port output from the integrated data modulator promptly obtains carrying radio frequency signal, the light signal of voice signal and the triple services of downlink data.
2. the WDM passive optical network system of support quadruple service transmitting function according to claim 1, it is characterized in that, after wavelength interleaver filtering, the frequency in the light signal of N road is that sideband and the center base band of f1 all exported from wavelength interleaver first output port; Frequency in the light signal of N road is that the sideband of f2 is all exported from second output port of wavelength interleaver, and each road is the differential phase keying (DPSK) form of carrier suppressed.
3. the WDM passive optical network system of support quadruple service transmitting function according to claim 1, it is characterized in that, in the described integrated data modulator, the radiofrequency signal that the radio service data that the first bipolar signal generator is produced and first radio-frequency signal source produce is carried out mixing, the subcarrier signal of telecommunication that obtains, it also is radio frequency signal, be loaded on single rf inputs mouth that drives the Mach zehnder modulators, obtain the differential phase keying (DPSK) light signal of carrier suppressed, the radiofrequency signal that the voice signal that the second bipolar signal generator is produced and second radio-frequency signal source produce is carried out mixing, the subcarrier signal of telecommunication that obtains is loaded on two second rf inputs mouths that drive the Mach zehnder modulators, also the two interior light signal phase places of second arm that drive the Mach zehnder modulators of i.e. modulation obtain double-side band differential phase keying (DPSK) light signal; Simultaneously, the downlink data that the downlink data generator is produced is loaded on two first rf inputs mouths that drive the Mach zehnder modulators, can change the light signal phase place in its first arm; At two outputs that drive the Mach zehnder modulators, the light signal of first, second arm interferes, phase place by light signal in the first arm that changes, make the centered carrier of double-side band differential phase keying (DPSK) light signal in the interior light signal of the first arm and second arm offset or not offset, also promptly produce a nonreturn to zero code light signal by downlink data control; Two Mach zehnder modulators that drive are exported the double-side band differential phase keying (DPSK) light signal that carries voice signal and downlink data, two sidebands carry voice signal, the center base band is carried downlink data, the differential phase keying (DPSK) light signal of the carrier suppressed of radio frequency signal is carried in the output of single driving Mach zehnder modulators, then two ways of optical signals is closed the road, through N * 1 mixer, light signal on all N wavelength is coupled into an optical fiber, again by after the wavelength interleaver filtering, the frequency of carrying voice signal in the light signal of N road is that the sideband of f2 is all exported from second output port, each road light signal is the differential phase keying (DPSK) form of carrier suppressed, input broadcast video transmitter, the intensity of light signal is modulated to carry broadcast video signal, extinction ratio maintains 5dB～3dB, to keep the voice signal that the light signal phase place is carried, the light signal of first output port output of wavelength interleaver is carrying radio frequency signal and downlink data, the light signal of broadcast video transmitter output then carries voice signal and broadcast video signal, both are through 2 * 1 optical combiners, be coupled as one the tunnel, the input erbium-doped fiber amplifier amplifies in advance.
4. the WDM passive optical network system of support quadruple service transmitting function according to claim 1, it is characterized in that, described optical network unit comprises the voice signal receiver, the broadcast video receiver, the downlink data receiver, the radio frequency signal receiver, second intensity modulator, the upstream data generator, optical filter, antenna and two 1 * 2 splitters, wherein: the input port of optical network unit links to each other with the input port of optical filter, first output port of optical filter links to each other with the input port of the one 1 * 2 splitter, first output port of the one 1 * 2 splitter links to each other with the voice signal receiver, second output port links to each other with the broadcast video receiver, second output port of optical filter links to each other with the downlink data receiver, the 3rd output port of optical filter links to each other with the input port of the 21 * 2 splitter, first output port of the 21 * 2 splitter links to each other with the input port of radio frequency signal receiver, the output port of radio frequency signal receiver links to each other with antenna, second output port of the 21 * 2 splitter links to each other with the input port of second intensity modulator, the upstream data that the upstream data generator produces is imported the rf inputs mouth of second intensity modulator, and the output port of second intensity modulator is the output port of optical network unit.
5. the WDM passive optical network system of support quadruple service transmitting function according to claim 4, it is characterized in that, described voice signal receiver comprises one 1 bit delay interferometer, a photoelectric detector, wherein input optical signal links to each other with the input port of 1 bit delay interferometer, the output port of 1 bit delay interferometer links to each other with the input port of photoelectric detector, the bandwidth of photoelectric detector needs greater than speech signal bandwidth, less than 2 * f2.
6. the WDM passive optical network system of support quadruple service transmitting function according to claim 4, it is characterized in that, described radio frequency signal receiver comprises one 1 bit delay interferometer, a photoelectric detector, wherein input optical signal links to each other with the input port of 1 bit delay interferometer, the output port of 1 bit delay interferometer links to each other with the input port of photoelectric detector, and the bandwidth of photoelectric detector needs greater than 2 * f1.
7. the WDM passive optical network system of support quadruple service transmitting function according to claim 4, it is characterized in that, in the described optical network unit, the light signal of respective wavelength is divided into three the tunnel through optical filter is filtered, the frequency that is followed successively by former light signal is respectively two sidebands and center base band of f1 and f2, frequency is that the sideband of f2 is the differential phase keying (DPSK)/amplitude shift keying light signal of carrier suppressed, carrying voice signal and broadcast video signal, it is through the one 1 * 2 splitter, be divided into identical two ways of optical signals, one road input speech signal receiver demodulates voice signal from the light signal phase information; Another road input broadcast video receiver demodulates broadcast video signal from light signal strength information; Center base band light signal is that the nonreturn to zero code light signal is directly imported the downlink data receiver, demodulates downlink data; Frequency is the sideband that carries radio frequency signal of f1, differential phase keying (DPSK) light signal for carrier suppressed, it is divided into identical two ways of optical signals through the 21 * 2 splitter, one tunnel input radio frequency signal receiver, from the light signal phase information, demodulate radio frequency signal, load on the antenna; The differential phase keying (DPSK) light signal of carrier suppressed has constant amplitude envelops, directly inserts the upstream data transmitter, carries out amplitude shift key modulation, obtains uplink optical signal, sends it back optical line terminal again;
Described optical filter is simulated its filter action by use second polarization beam apparatus, second circulator and centre wavelength at the optical network unit end as second Fiber Bragg Grating FBG of light carrier.
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| CN102025682B (en) * | 2010-12-24 | 2013-05-01 | 北京邮电大学 | All-optical OFDM (orthogonal frequency division multiplexing) system transmitter device, OFDM system and method for processing signals |
| CN102075822B (en) * | 2011-01-19 | 2016-02-10 | 中兴通讯股份有限公司 | WDM passive optical network system, communication means and optical line terminal equipment |
| CN103209026B (en) * | 2013-02-28 | 2016-05-18 | 西南交通大学 | A kind of full duplex multi-service fusion light-carried wireless transmission system |
| CN103402146B (en) * | 2013-07-10 | 2016-06-01 | 上海交通大学 | The descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network |
| US10574382B2 (en) * | 2017-10-06 | 2020-02-25 | Huawei Technologies Co., Ltd. | Low cost intensity-modulated direct-detection (IMDD) optical transmitter and receiver |
| CN109962740A (en) * | 2017-12-22 | 2019-07-02 | 中兴光电子技术有限公司 | A kind of reflecting light modulating device and method |
| CN110007394B (en) * | 2019-05-17 | 2020-05-26 | 中南大学 | Method for preparing phase-shift fiber Bragg grating |
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