CN101110650B - Passive optical network transmission method integrating treble play - Google Patents
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Abstract
A method to realize a downlink triplex service signal playing and uplink data transmission of a passive optical system in the technical field of optical communications adopts a standard double parallel Mach-Zehnder modulator. Wherein, a first sub-modulator is driven by an auxiliary carrier signal. An auxiliary optical carrier signal is obtained and restricted by a carrier by deflecting to a lowest point of the first sub-modulator. A second sub-modulator is driven by base band data. A voice signal is input in a deflected point between a lowest point of the second sub-modulator and a switching voltage to gain mutually orthogonal swing key modulation/differential phase shift key modulation signal, including downlink triplex service signal playing of video, voice and data, to take service signals in forms of auxiliary carrier and swing key modulation/differential phase shift key modulation signal. Besides, the downlink differential phase shift key modulation signal is re-modulated by the uplink data. Therefore, the optical network unit discards attached light waves. The present invention reduces optical transmission hardware cost and simplifies system structure.
Description
Technical field
The present invention relates to the method in a kind of optical communication technique field, specifically, is a kind of passive optical network transmission method of integrating treble play.
Background technology
Treble play is meant and utilizes optical-fiber network to provide voice, video and three kinds of services of data simultaneously for the user.With in the past respectively by Video service supplier, voice service supplier and network data services supplier institute respectively the service set of control be incorporated in the same network configuration, reduce deployment cost, 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.EPON is a kind of emerging optical communication technique, have high bandwidth, high reliability, lowly safeguard cost, to advantages such as the business transmission transparency and prefect dielectric networks, not only can promote business user's access speed and integrated service ability greatly, and can provide enough quality of services to guarantee, simultaneously, because its intrinsic characteristic, its utilization prospect in the communication system of point-to-multipoint is extensive, is regarded as the best optical fiber access technology of Access Network of future generation always.Therefore integrating treble play on the EPON platform is an attractive scheme, is subjected to the extensive concern of industry day by day.
Find through literature search prior art, people such as JianjunYu are published in 2007 the 19th volumes of periodical " IEEE Photonicstechnology Letter " " IEEE optical tech wall bulletin ", in " Demonstration of aNovel WDM Passive Optical Network Architecture With Source-Free OpticalNetwork Units (optical network unit does not have the demonstration of the WDM passive optical network structure of light carrier) ", adopt a plurality of discrete optical devices, realized transmitting 10-Gb/s data-signal and 2.5-Gb/s vision signal simultaneously at down link, use the baseband signal of reflective semiconductor image intensifer modulation down link simultaneously, also be done at ul transmissions 10-Gb/s data-signal.But in this scheme, just realized the transmission of data and the double business of video simultaneously at down link, and this scheme has been used a plurality of discrete optical devices at transmitting terminal, the complex structure that has caused transmitter in optical line terminal, be difficult to integratedly, also cause simultaneously more system to insert loss.
Summary of the invention
The objective of the invention is deficiency at the prior art existence, a kind of passive optical network transmission method of integrating treble play is provided, make its two parallel Mach zehnder modulators that adopts a standard just can realize the concentration of transmissions of down link treble play, based on the also realization simultaneously of remodulates of the uplink data business of descending differential phase keying (DPSK) signal.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
Step 2, provide treble play signal and radiofrequency signal with data source, the treble play signal is vision signal, voice signal and data-signal, obtain subcarrier signal by vision signal and radiofrequency signal mixing, drive the prevention at radio-frequency port of the first sub-modulator with this subcarrier signal, bias point is arranged on the minimum point of the first sub-modulator, obtains the optical sub-carrier signal that a light carrier suppresses.
Described subcarrier signal is obtained by an electric frequency mixer mixing by vision signal and the radiofrequency signal that data source provides.
Step 4, drive the offset port of the second sub-modulator with voice signal, and the bias point of the second sub-modulator is arranged on minimum point place near second modulator, but exceed 1/5 times changing voltage than minimum point, make voice signal be superimposed upon on the differential phase keying (DPSK) signal, form amplitude-shift keying/differential phase keying (DPSK) signal.
The bias point setting of the described second sub-modulator uses an electrical bias device to adjust bias voltage, and voice signal is input to the electrical bias device earlier, drives the offset port of the second sub-modulator then by the electrical bias device.
Described amplitude-shift keying/differential phase keying (DPSK) signal is mutually orthogonal, and is separate between them.
Step 5, the bias voltage that MAIN MUX is set equal the changing voltage of main Mach zehnder modulators, make the output of two sub-modulators keep identical phase place, their output results added like this, the signal of treble play just is loaded into respectively on optical sub-carrier signal and amplitude-shift keying/differential phase keying (DPSK) signal to be transmitted.
Described two sub-modulators, the optical sub-carrier signal that the first sub-modulator obtains is suppressed, and the second sub-modulator obtains the differential phase keying (DPSK) data signal modulation on light carrier, the signal of the output addition gained of two sub-modulators is separate.
Step 6, at receiving terminal, separate the signal that is loaded into optical sub-carrier and the stylistic treble play of amplitude-shift keying/differential phase keying (DPSK) respectively of down link with optical filter, the optical receiver by separately carries out opto-electronic conversion, obtains the signal on the electric territory.Wherein, the part of isolated differential phase keying (DPSK) signal is by up link amplitude-shift keying data remodulates, and the uplink data of remodulates is sent to transmitting terminal after by Optical Fiber Transmission.
Described optical filter is realized in conjunction with Fiber Bragg Grating FBG by circulator.Transmissive is the optical sub-carrier signal from Fiber Bragg Grating FBG, and what reflect back from Fiber Bragg Grating FBG is amplitude-shift keying/differential phase keying (DPSK) signal.
Described differential phase keying (DPSK) signal at first will be through the delay interferometer of one 1 bit, and the differential phase keying (DPSK) conversion of signals of phase modulated is become intensity-modulated signal, detects with optical receiver again.
Described differential phase keying (DPSK) signal, wherein a part of Fen Liing is used as the light carrier of modulating upstream data, and then up link does not need the light source that adds.
The present invention adopts the two parallel Mach zehnder modulators of a standard just to realize the concentration of transmissions of descending treble play signal (comprising video, data and voice signal) and upstream data. signals simultaneously.Descending treble play only needs one modulator, thereby transmitter is simple and compact for structure, is easy to integrated; Owing to do not need to adopt a plurality of discrete optical devices, the existing scheme of comparing, system are inserted loss and have approximately been reduced 10-dB; In addition, realize simultaneously based on the remodulates of the upstream data service of down link differential phase keying (DPSK) signal, so the modulation of upstream data does not need to provide in addition light source yet.And the signal of up link and down link modulation all adopts same light wave, is easier to the wavelength centralized management of descending treble play signal and upward signal.Adopt the present invention, downlink transmission system has been saved the cost of wavelength-division interleaver, phase-modulator and optical coupler, and the uplink system has saved the cost of a light source, thereby the deployment cost of system greatly reduces.
Description of drawings
Fig. 1 is principle of the invention figure;
Fig. 2 is an embodiment of the invention schematic diagram;
Fig. 3 is embodiment of the invention figure as a result.
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; detailed execution mode and concrete operating process have been provided; but protection case of the present invention is to implement under the prerequisite; provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Be schematic diagram of the present invention as shown in Figure 1, provide continuous light wave, be transferred to the two parallel Mach zehnder modulators of a standard by laser.Two parallel Mach zehnder modulators by two on main Mach zehnder modulators and two arms thereof the parallel and first sub-modulator that characteristic is identical and the second sub-modulator form, MAIN MUX is in conjunction with the output of two sub-modulators.Drive the prevention at radio-frequency port of the first sub-modulator with the subcarrier signal that obtains after vision signal and the radiofrequency signal mixing, the first sub-modulator is biased in the minimum point of modulator, produces the optical sub-carrier signal of carrier suppressed; Drive the prevention at radio-frequency port of the second sub-modulator then with base band data, bias point also is arranged on the minimum point of modulator, obtains being modulated at the differential phase keying (DPSK) data-signal on the light carrier.Voice signal is input to the electrical bias device earlier, drive the offset port of the second sub-modulator by the electrical bias device, the bias voltage of adjusting the electrical bias device then makes the bias point of the second sub-modulator in the minimum point of modulator with near the minimum point of second modulator, but exceed than minimum point between 1/5 times the changing voltage, obtain being superimposed upon the amplitude-shift keying/differential phase keying (DPSK) signal on the differential phase keying (DPSK) signal.Regulate the biasing of MAIN MUX subsequently, make the output addition of two sub-modulators.Therefore, the signal of treble play is loaded into respectively on the modulation signal of subcarrier and amplitude-shift keying/differential phase keying (DPSK) and is transmitted.At receiving terminal, with optical filter separated light subcarrier and amplitude-shift keying/differential phase keying (DPSK) signal.Optical sub-carrier and amplitude-shift keying signal carry out opto-electronic conversion through optical receiver separately, recover video and voice signal, send to the terminal use by video channel and voice channel then.The differential phase keying (DPSK) signal is divided into two parts, and a part directly detects with optical receiver and recovers data-signal, sends to the terminal use by data channel then; Another part is detected with optical receiver at transmitting terminal after the transmitting uplink data by up link amplitude-shift keying data remodulates.
As shown in Figures 2 and 3, be specific embodiments of the invention.It is the continuous light wave of 1548.86-nm that laser provides wavelength, and this continuous light wave is input to two parallel Mach zehnder modulators.The continuous light ripple is divided into two-way in two parallel Mach zehnder modulators, enters into the first sub-modulator and the second sub-modulator respectively.Vision signal is that the length of the non-return-to-zero of a 1.25-Gbps reaches 2
7-1 PRBS pseudo-random bit sequence form, the radiofrequency signal mixing of it and 10-GHz obtains subcarrier signal [waveform is seen Fig. 3 (a)], the subcarrier signal that obtains is used for driving the first sub-modulator, and be biased in the minimum point of the first sub-modulator, produce the optical sub-carrier signal [waveform, eye pattern and spectrum are seen Fig. 3 (b-i)-(b-iii) respectively] of the carrier suppressed of 20-GHz; Length with the non-return-to-zero of 1.25-Gbps reaches 2
7The data-signal of-1 PRBS pseudo-random bit sequence drives the second sub-modulator, and bias point is arranged on the minimum point of the second sub-modulator, obtains being modulated at the differential phase keying (DPSK) signal on the light carrier.Voice signal is that the length of the non-return-to-zero of 1-Gbps reaches 2
7-1 PRBS pseudo-random bit sequence form, this signal is input to the electrical bias device earlier, behind the electrical bias device, drive the offset port of the second sub-modulator, and the bias point that makes the second sub-modulator is arranged between the minimum point of the second sub-modulator and the changing voltage sub-fraction (near the minimum point of second modulator, but exceed 1/5 times changing voltage than minimum point), make voice signal be superimposed upon and form amplitude-shift keying/differential phase keying (DPSK) form [spectrum is seen Fig. 3 (c)] on the differential phase keying (DPSK) signal.Regulate the biasing of the MAIN MUX of two parallel Mach zehnder modulators then, make two sub-modulators export additions.Light signal after the addition is input to erbium-doped fiber amplifier and amplifies, and filters out spontaneous stimulated radiation noise with the tunable optical filter of 0.4-nm bandwidth, obtains the luminous power [spectrum is seen Fig. 3 (d)] of about 6-dBm.Light signal after the amplification enters into optical fiber, after the 25-km Optical Fiber Transmission, light signal is input to a circulator and a 3-dB bandwidth is 0.1nm, and reflectivity is the optical filter that 90% Fiber Bragg Grating FBG constitutes, and isolates optical sub-carrier signal and amplitude-shift keying/differential phase keying (DPSK) signal.From the Fiber Bragg Grating FBG filter reflect away and through circulator output be amplitude-shift keying/differential phase keying (DPSK) signal [spectrum is seen Fig. 3 (e)], what go out from the Fiber Bragg Grating FBG filter transmission is optical sub-carrier signal [spectrum is seen Fig. 3 (f)].For optical sub-carrier and amplitude-shift keying signal, directly the low speed optical receiver with 2.5-GHz detects; And the differential phase keying (DPSK) signal enters optical branching device, the two parts that divide success rate to equate, and a part enters into the delay interferometer of 1-bit and carries out demodulation, and the low speed optical receiver that the signal after the demodulation enters into 2.5-GHz detects; Another part enters into the single armed Mach zehnder modulators of a standard, as the light wave of uplink data, is reached 2 by the length of the non-return-to-zero of the 1.25-Gbps of up link
7-1 PRBS pseudo-random bit sequence PRBS data-driven is biased in the minimum point of single armed Mach zehnder modulators and the middle place of peak, and the optical fiber that the uplink signal of remodulates enters 25km is transported to transmitting terminal, with the low speed optical receiver detection of 2.5-GHz.
As shown in Figure 3, be the present embodiment result.Fig. 3 (a) is the waveform of the subcarrier signal that obtains of mixing, because the influence of direct current and low-frequency component in the base band data in the optical mixing process has certain amplitude on 0 level; (b-i)-(b-iii) be respectively to drive the first sub-modulator with subcarrier signal, waveform, eye pattern and the spectrum of the light signal that employing light carrier inhibition technology obtains, the waveform of subcarrier is corresponding fully on the waveform of optical sub-carrier and the electric territory, what obtain as can be seen on eye pattern and the spectrum is that repetition rate is the light signal of twice radio frequency signal frequency, and light carrier suppresses to surpass 10-db; (c) be prevention at radio-frequency port and the offset port that drives the second sub-modulator with 1.25-Gbps and 1-Gbps data respectively, the spectrum of the amplitude-shift keying that obtains/differential phase keying (DPSK) signal; (d) be spectrum after the output signal of two parallel Mach zehnder modulators is amplified through erbium-doped fiber amplifier, the last amplitude optical sub-carrier sideband of carrier wave, this is owing to filter is not that desirable filter causes; (f) output signal of two parallel Mach zehnder modulators through the Fiber Bragg Grating FBG filter after, the spectrum of the optical sub-carrier signal of transmission, though the residual composition that is positioned on the light carrier is arranged, carrier suppressed has surpassed 10db; (g) be the electric eye figure of downlink subcarriers signal after through the low speed optical receiver opto-electronic conversion of a 2.5-GHz, because subcarrier signal is vulnerable to the influence of nonlinear effect in Optical Fiber Transmission, and the interference that remains in composition on the carrier wave, eye opening is subjected to certain influence; (h) be the electric eye figure of down link amplitude-shift keying signal after through the low speed optical receiver opto-electronic conversion of a 2.5-GHz, because the influence of the differential phase keying (DPSK) signal of stack and residual width of cloth carrier wave composition, eye diagram quality is poor slightly, but can obtain not having the reception of error code; (i-i) the light eye pattern after to be down link differential phase keying (DPSK) signal through 1 bit delay interfere, though the influence of the amplitude-shift keying signal of stack and residual width of cloth carrier wave composition, but because delay interferometer has certain filter action, so the light eye opening is better; (i-ii) be the demodulation of down link differential phase keying (DPSK) signal after, through the electric eye figure after the low speed optical receiver opto-electronic conversion of a 2.5-GHz; (j) be the up link amplitude-shift keying signal of the remodulates electric eye figure after through the low speed optical receiver opto-electronic conversion of a 2.5-GHz.Because be to modulate as light carrier with the differential phase keying (DPSK) signal of down link, and the synchronous inaccuracy of the signal of telecommunication, eye diagram quality is poor slightly, but can obtain not having the reception of error code.
Claims (10)
1. the passive optical network transmission method of an integrating treble play is characterized in that, comprises the steps:
Step 1, at transmitting terminal, adopt the two parallel Mach zehnder modulators of a standard that the continuous light wave that provides by laser is provided, light wave is divided into two-way in double-parallel modulator continuously, enters into the identical first sub-modulator and the second sub-modulator of structure of two parallel Mach zehnder modulators respectively;
Step 2, provide treble play signal and radiofrequency signal with data source, the treble play signal is vision signal, voice signal and data-signal, vision signal and radiofrequency signal mixing obtain subcarrier signal, drive the prevention at radio-frequency port of the first sub-modulator with this subcarrier signal, be biased in the minimum point of the first sub-modulator, obtain the optical sub-carrier signal that a light carrier suppresses;
Step 3, drive the prevention at radio-frequency port of the second sub-modulator with base band data, the bias point of the second sub-modulator is arranged on minimum point, obtains being modulated at the differential phase keying (DPSK) signal on the light carrier;
Step 4, drive the offset port of the second sub-modulator with voice signal, and the bias point of the second sub-modulator is arranged between minimum point and the changing voltage, make voice signal be superimposed upon on the differential phase keying (DPSK) signal, form amplitude-shift keying/differential phase keying (DPSK) signal;
Step 5, the bias voltage that the MAIN MUX of two parallel Mach zehnder modulators is set equal the changing voltage of MAIN MUX, make the output of two sub-modulators keep homophase, the output addition of such two sub-modulators, the signal of treble play just are loaded into respectively on subcarrier and amplitude-shift keying/differential phase keying (DPSK) signal to be transmitted;
Step 6, at receiving terminal, the signal that is loaded into the treble play on optical sub-carrier signal and the amplitude-shift keying/differential phase keying (DPSK) signal that separates down link with optical filter, optical receiver by separately carries out opto-electronic conversion, obtain the signal on the electric territory, wherein, the part of the differential phase keying (DPSK) signal that separates is by up link amplitude-shift keying data remodulates, and the uplink data of remodulates is sent to transmitting terminal after by Optical Fiber Transmission.
2. the passive optical network transmission method of integrating treble play according to claim 1, it is characterized in that, the described first sub-modulator and the second sub-modulator are identical, and are arranged on abreast on main Mach zehnder modulators two arms of two parallel Mach zehnder modulators.
3. the passive optical network transmission method of integrating treble play according to claim 1 and 2, it is characterized in that, the signal that obtains after the output addition of the described first sub-modulator and the second sub-modulator lays respectively at corresponding separately frequency range, and they are separate.
4. the passive optical network transmission method of integrating treble play according to claim 1 is characterized in that, described subcarrier signal is obtained by an electric frequency mixer mixing by vision signal and the radiofrequency signal that data source provides.
5. the passive optical network transmission method of integrating treble play according to claim 1, it is characterized in that, the bias point setting of the described second sub-modulator, use an electrical bias device to adjust bias voltage, voice signal is input to the electrical bias device earlier, drive the offset port of the second sub-modulator then by the electrical bias device, the bias point of the second sub-modulator is arranged on the minimum point place near second modulator, but exceeds 1/5 times changing voltage than minimum point.
6. the passive optical network transmission method of integrating treble play according to claim 1 is characterized in that, described amplitude-shift keying/differential phase keying (DPSK) signal is mutually orthogonal, and is separate between them.
7. the passive optical network transmission method of integrating treble play according to claim 1, it is characterized in that, the described signal that is loaded into the treble play on optical sub-carrier signal and the amplitude-shift keying/differential phase keying (DPSK) signal with optical filter separation down link is carried in respectively on subcarrier and the amplitude-shift keying/differential phase keying (DPSK) signal, and uses single wavelength to modulate.
8. the passive optical network transmission method of integrating treble play according to claim 1, it is characterized in that, described optical filter is realized in conjunction with Fiber Bragg Grating FBG by circulator, transmissive is the optical sub-carrier signal from Fiber Bragg Grating FBG, and the reflection past is the amplitude-shift keying/differential phase keying (DPSK) signal of stack from Fiber Bragg Grating FBG.
9. according to the passive optical network transmission method of claim 1 or 8 described integrating treble plays, it is characterized in that, described differential phase keying (DPSK) signal, at first will be through the delay interferometer of one 1 bit, differential phase keying (DPSK) signal with phase modulated, convert intensity-modulated signal to, detect with optical receiver again.
10. according to the passive optical network transmission method of claim 1 or 8 described integrating treble plays, it is characterized in that, described differential phase keying (DPSK) signal, the part of after separating is as the light carrier of upstream data.
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| CN101227754B (en) * | 2008-01-31 | 2010-11-03 | 上海交通大学 | Apparatus and method for selectively transmitting video business in wavelength division multiplexing passive optical network |
| CN101316150B (en) * | 2008-07-03 | 2011-06-08 | 上海交通大学 | Wavelength division multiplexing system and method supporting double-video service broadcast distribution |
| CN101351055B (en) * | 2008-07-10 | 2011-04-13 | 上海交通大学 | WDM passive optical network system capable of supporting quadruple service conveying function |
| CN101686418A (en) * | 2008-09-28 | 2010-03-31 | 华为技术有限公司 | Method, system and device for transmitting and processing signals in passive optical network |
| WO2010064999A1 (en) * | 2008-12-05 | 2010-06-10 | Agency For Science, Technology And Research | Wavelength division multiplexed passive optical network |
| JP5506955B2 (en) * | 2011-01-05 | 2014-05-28 | 三菱電機株式会社 | Optical communication device |
| EP3270557B1 (en) * | 2015-04-09 | 2019-03-06 | Huawei Technologies Co., Ltd. | Digital signal processor, sender and system |
| CN111130645B (en) * | 2019-12-23 | 2021-05-07 | 浙江大学 | Automatic control system and method for bias voltage of double parallel Mach-Zehnder modulator |
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| EP1279288A1 (en) * | 2000-03-28 | 2003-01-29 | Marconi Communications, Inc. | Fiber to the home (ftth) multimedia access system |
| CN1980109A (en) * | 2005-12-02 | 2007-06-13 | 北京邮电大学 | Whole-business accessing method and WDM passive light network system |
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| EP1279288A1 (en) * | 2000-03-28 | 2003-01-29 | Marconi Communications, Inc. | Fiber to the home (ftth) multimedia access system |
| CN1980109A (en) * | 2005-12-02 | 2007-06-13 | 北京邮电大学 | Whole-business accessing method and WDM passive light network system |
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