CN101795159A - High-speed WDM (Wavelength Division Multiplexing) light communication system and method for resisting non-linearity effect in same - Google Patents
High-speed WDM (Wavelength Division Multiplexing) light communication system and method for resisting non-linearity effect in same Download PDFInfo
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Abstract
The invention discloses a high-speed WDM (Wavelength Division Multiplexing) light communication system and a method for resisting non-linearity effect in the same. The method comprises the following steps of: (A10) respectively dividing linearly polarized light into polarized light in a first polarization direction and polarized light in a second polarization direction, wherein the two paths of polarized light have orthogonal polarization states; (A20) coding and modulating digital signals by adopting polarization interleaved codes, i.e. respectively modulating code 1 of the same group of the digital signals to the polarized light in the first polarization direction and the polarized light in the second polarization direction; (A30) merging the polarized light in the first polarization direction and the polarized light in the second polarization direction into a transmission light wave, multiplexing by a wavelength division multiplexer at a transmitting terminal and outputting to an optical fiber link; and (A40) dividing the transmission light wave by a wavelength division demultiplexer at a receiving terminal and respectively outputting to a light-strength detecting light receiver. The invention damages the forming conditions of iFWM (intra-channel Four-Wave Mixing) by utilizing the polarization characteristics of the light wave. Compared with the traditional method, the invention lowers the requirements for the linear width of a laser and the performance of a modulator so that the actual iFWM-resisting effect is better.
Description
Technical field
The present invention relates to optical communication system, particularly relate to the method that suppresses nonlinear effect in high speed wdm optical communication system and this system.
Background technology
Used technical term implication is as follows among the present invention:
WDM, Wavelength Division Multiplexing, wavelength division multiplexing;
IFWM, four wave mixing in the Intra-channel Four Wave Mixing, channel;
PolSK, Polarization Shift Keying, polarisation shift keying;
IXPM, cross-phase modulation in the Intra-channel Cross-Phase Modulation, channel;
SPM, Self-Phase Modulation, cross-phase modulation;
CSRZ, Carrier Suppression Return Zero, Carrier-Suppressed Return-to-Zero;
AMI, Alternative Mark Inversion, alternate mark inversion code.
In order to adapt to more and more big network bandwidth requirements, the WDM optical fiber telecommunications system is widely adopted.Existing WDM optical fiber telecommunications system is based on the channel speed of 10Gbps, yet along with the continuous development of technology, the optical fiber telecommunications system of 40Gbps is commercial gradually, and the 100Gbps optical fiber telecommunications system of higher rate also begins one's study.In optical fiber communication, loss, chromatic dispersion and nonlinear effect are to limit the major obstacle that its transmittability promotes.
When the single channel transmission rate is lower than 10Gb/s, from phase modulated (Self-phase Modulation, SPM), cross-phase modulation (Cross-phase Modulation, XPM) and four wave mixing (Four-waveMixing, FWM) be topmost nonlinear effect, therefore, the nonlinear effect of interchannel is the significant consideration of system design.Be higher than 10Gb/s and work as the single channel transmission rate, after particularly being higher than 40Gb/s, cross-phase modulation (Intrachannel Cross-phase Modulation in the band, iXPM) and the band in four wave mixing (Intrachannel Four-wave Mixing, iFWM) replace XPM and FWM, become the main factor of restriction high speed fibre transmission system, this is because in high speed optical communication system, the IXPM effect makes adjacent pulse overlap mutually easily, cause the time jitter between adjacent pulse, iFWM then causes the amplitude jitter of " 1 " pulse easily, and can produce " shadow " pulse (promptly so-called ' ghost ' pulse) in " 0 " pulse place, they all can cause the deterioration of eye pattern, increase the error rate, thus the transmittability of restriction system.But studies show that the influence of iXPM size is relevant with the ratio of pulse duration τ (FWHM) and pulse period T: when τ/T＜0.3, iXPM is very little; When τ/T=1, the iXPM maximum; When τ/T＞＞1, iXPM is also very little.We know that in Optical Fiber Transmission, because the effect of chromatic dispersion, τ is changing.In at present common dispersion management optical transmission system, in most length of optical fiber link, τ/T＞＞1, i.e. pulse overlaps very serious, that is iXPM is very little, and therefore, as a whole, the influence of iXPM in dispersion management optical transmission system is less.Like this, iFWM becomes the nonlinear effect that mainly needs consideration in the high speed wdm optical communication system.
The formation of FWM effect requires to satisfy phase-matching condition.For interchannel FWM, as long as optical fiber is not zero chromatic dispersion, channel spacing is at 50GHz or bigger, and phase-matching condition generally is difficult to satisfy, so can ignore its influence.For FWM in the channel (being iFWM), the each harmonic of light carrier frequency is easier to satisfy phase-matching condition, forms mixing easily.Specifically, iFWM causes the amplitude jitter of " 1 " sign indicating number, and causes that shadow pulse (Ghost Pulse) appears in " 0 " code position.Fig. 1 is an example with pulse train " 1101 ", has schematically provided the formation of iFWM.
In order to suppress iFWM, usual way is to destroy its phase-matching condition, promptly adopts special sign indicating number type, makes phase-matching condition be difficult to satisfy, or the iFWM of generation is cancelled each other.Because the two-forty system generally adopts the RZ sign indicating number, so have at present much by improving the method that the RZ sign indicating number suppresses iFWM.Make adjacent two code elements anti-phase such as CSRZ, RZ-AMI makes adjacent two " 1 " sign indicating number anti-phase, and also having a kind of design is that making with adjacent two " 1 " sign indicating number is the anti-phase (see figure 2) of code character of unit.
But the method for above-mentioned inhibition iFWM needs to satisfy strict phase condition, and very high to the live width and the modulator performance requirement of laser, the performance of real system does not reach the effect of theoretical description.
In sum, for the optical communication system of two-forty, iFWM is the topmost nonlinear effect of restriction system performance.The existing method effect in actual applications that suppresses iFWM is subjected to the restriction of physical condition, can not be satisfactory, need the method for more excellent inhibition iFWM.
Summary of the invention
Technical problem to be solved by this invention is to solve in the high speed wdm optical communication system, because the problem of its transmittability of iFWM effect limits.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention provides the method that suppresses nonlinear effect in a kind of high speed wdm optical communication system, may further comprise the steps:
A10, at the transmitting terminal of described optical communication system, the linearly polarized light of the different wave length that laser is sent generates the first polarization direction polarised light and the second polarization direction polarised light of two-way polarization state quadrature respectively;
The mode of A20, employing polarization state interleaved code type is carried out coded modulation to digital signal, is about to " 1 " sign indicating number difference coded modulation adjacent in the same group of digital signal on the first polarization direction polarised light and the second polarization direction polarised light;
A30, the first polarization direction polarised light and the second polarization direction polarised light of different wave length is combined into the transmission light wave, and after the transmitting terminal wavelength division multiplexer is multiplexing, exports optical fiber link to;
A40, at the receiving terminal of described optical communication system, the transmission light wave exports luminous intensity respectively to and surveys optical receiver behind receiving terminal decomposition multiplex device partial wave.
In the said method, between steps A 20 and steps A 30, increase steps A 205, in steps A 205, make adjacent " 1 " the code phase phase difference of pi in the digital signal that loads in the polarised light of same polarization direction, the i.e. phase place phase difference of pi of adjacent " 1 " of the digital signal that loads in the polarised light of first polarization direction sign indicating number, the phase place of adjacent " 1 " of the digital signal that loads in the polarised light of second polarization direction sign indicating number is phase difference of pi also.
The present invention also provides a kind of high speed wdm optical communication system, comprise transmitting terminal, receiving terminal, transmitting terminal and receiving terminal are connected on the optical fiber link by transmitting terminal wavelength division multiplexer and receiving terminal Wave decomposing multiplexer respectively, transmitting terminal is provided with the laser that is used to produce the different wave length linearly polarized light, receiving terminal is provided with Light-Intensity Detector, transmitting terminal also is provided with the polarised light generating apparatus, first, the linearly polarized light that second optical modulator and polarization beam combiner or two-in-one coupler, polarised light generating apparatus are used for different wave length that laser is sent generates the first polarization direction polarised light and the second polarization direction polarised light of two-way polarization state quadrature respectively; First, second optical modulator adopts the mode of polarization state interleaved code type that digital signal is carried out coded modulation, is about to " 1 " sign indicating number difference coded modulation adjacent in the same digital signal on the first polarization direction polarised light and the second polarization direction polarised light; Polarization beam combiner or two-in-one coupler are used for the first polarization direction polarised light of different wave length and the second polarization direction polarised light are combined into the transmission light wave, and export optical fiber link to after the transmitting terminal wavelength division multiplexer is multiplexing; The receiving terminal Wave decomposing multiplexer will be delivered to luminous intensity respectively and survey receiver behind the transmission light wave partial wave of optical fiber link transmission.
In order to suppress the iFWM effect better, the first polarization direction polarised light after first, second light modulator modulates and the second polarization direction polarised light, modulate through first, second phase-modulator again, make adjacent " 1 " the code phase phase difference of pi in the digital signal that loads in the polarised light of same polarization direction respectively.
Further, described polarised light generating apparatus is polarization beam apparatus, splitter, optical switch or polarization rotator.
The present invention has utilized the polarization characteristic of light wave to destroy the formation condition of iFWM, compares with existing method, and the live width of laser, the requirement of modulator performance are reduced, and makes that the actual effect that suppresses iFWM is better.
Description of drawings
Fig. 1 iFWM produces schematic diagram;
The various sign indicating number type schematic diagrames that Fig. 2 uses at present;
Fig. 3 polarization state interleaved code provided by the invention type schematic diagram;
Fig. 4 phase control polarization state provided by the invention interleaved code type schematic diagram;
Fig. 5 a kind of optical communication system embodiment schematic diagram that suppresses iFWM provided by the invention.
Embodiment
The performance of optical communication system can be subjected to the restriction of nonlinear effect, and particularly for the high speed wdm optical communication system, the nonlinear effect that wherein has the greatest impact is the iFWM effect, need adopt an effective measure and suppress.The invention provides the method that suppresses nonlinear effect in a kind of high speed wdm optical communication system, can effectively suppress the iFWM effect of optical fiber link, improve its transmittability.
The method that suppresses nonlinear effect in the high speed wdm optical communication system may further comprise the steps:
A10, at the transmitting terminal of described optical communication system, the linearly polarized light of the different wave length that laser is sent generates the first polarization direction polarised light and the second polarization direction polarised light of two-way polarization state quadrature respectively;
The mode of A20, employing polarization state interleaved code type is carried out coded modulation to digital signal, is about to " 1 " sign indicating number difference coded modulation adjacent in the same group of digital signal on the first polarization direction polarised light and the second polarization direction polarised light;
A30, the first polarization direction polarised light and the second polarization direction polarised light of different wave length is combined into the transmission light wave, and after the transmitting terminal wavelength division multiplexer is multiplexing, exports optical fiber link to;
A40, at the receiving terminal of described optical communication system, the transmission light wave exports luminous intensity respectively to and surveys optical receiver behind receiving terminal Wave decomposing multiplexer partial wave.
On this basis, can further introduce phase control method, constitute the polarization state interleaved code type of phase control, the specific implementation method is adjacent " 1 " the code phase phase difference of pi that makes in the digital signal that loads in the polarised light of same polarization direction, the i.e. phase place phase difference of pi of adjacent " 1 " of the digital signal that loads in the polarised light of first polarization direction sign indicating number, the phase place of adjacent " 1 " of the digital signal that loads in the polarised light of second polarization direction sign indicating number is phase difference of pi also.
The schematic diagram of polarization state interleaved code type as shown in Figure 3, the feature of this yard type is: the polarization state quadrature of adjacent " 1 " sign indicating number, if promptly first " 1 " sign indicating number is first polarization direction (as a horizontal direction), then second " 1 " sign indicating number is second polarization direction (as vertical direction) vertical with first polarization direction, the 3rd " 1 " sign indicating number is again first polarization direction, and the polarization state of adjacent " 1 " sign indicating number remains quadrature like this.Its principle that suppresses iFWM is, because light wave has polarization characteristic, has only between the light of same polarization direction and just the iFWM effect may take place.Therefore, adopt above-mentioned polarization state interleaved code type can effectively suppress the iFWM effect.Studies show that nonlinear interaction and code element distance dependent in the channel it is generally acknowledged that its interaction can be ignored after 6～7 code elements of being separated by.As seen, for the non-long data sequence that connects " 1 ", polarization state interleaved code type can suppress the iFWM of the overwhelming majority substantially.
The polarization state interleaved code type of phase control is to introduce phase control on the basis of polarization state interleaved code type shown in Figure 3, its schematic diagram as shown in Figure 4, the feature of this yard type is the phase place phase difference of pi of adjacent " 1 " sign indicating number of first polarization direction, the phase place of adjacent " 1 " sign indicating number of second polarization direction is phase difference of pi also, this sign indicating number type has the good restraining effect for the continuous long iFWM that connects " 1 " data sequence, and its principle that can further suppress iFWM is as follows:
With Schrodinger equation light being transmitted as in optical fiber described
In the formula, (z t) is the light field envelope to A, and α (z) is fibre loss, β
2(z) be chromatic dispersion, γ is a non linear coefficient.During nonlinear effect in channel is discussed, total light field be in the channel M pulse light field with, be:
Among following formula the right every, m=n=p's is SPM, and m ≠ n=p's is iXPM, and its remainder is iFWM.Obviously, as signal m, n, when p satisfies phase condition, if at time location t
M+p-nThe signal at place is " 1 " sign indicating number, and iFWM will cause the variation of pulse amplitude; If at time location t
M+p-nThe signal at place is " 0 " sign indicating number, and iFWM will produce shadow pulse (Ghost Pulse) at this place.After introducing phase control, the phase place phase difference of pi of adjacent " 1 " sign indicating number, near each code element is at time location t
M+p-nThe iFWM effect at place is cancelled each other, thereby effectively suppresses the iFWM effect under this kind situation.
The present invention also provides a kind of high speed wdm optical communication system, its structure as shown in Figure 5, this optical communication system comprises transmitting terminal and receiving terminal, transmitting terminal and receiving terminal are connected on the optical fiber link by transmitting terminal wavelength division multiplexer and receiving terminal Wave decomposing multiplexer respectively, transmitting terminal is provided with the laser that is used to produce the different wave length linearly polarized light, receiving terminal is provided with Light-Intensity Detector, also be provided with the polarised light generating apparatus at transmitting terminal, first, second optical modulator and polarization beam combiner or two-in-one coupler, the polarised light generating apparatus can be polarization beam apparatus PBS, splitter, optical switch or polarization rotator, at transmitting terminal, the output of continuous-wave laser is the line polarisation, by a polarization beam apparatus PBS who becomes miter angle with this line polarisation, obtain the first polarization direction polarised light and the second polarization direction polarised light of two-way polarization state quadrature; First, second optical modulator adopts the mode of polarization state interleaved code type that digital signal is carried out coded modulation, is about to same digital signal difference coded modulation on the first polarization direction polarised light and the second polarization direction polarised light; Polarization beam combiner PBC or two-in-one coupler are combined into the transmission light wave with the first polarization direction polarised light and the second polarization direction polarised light of different wave length, and export optical fiber link to after the transmitting terminal wavelength division multiplexer is multiplexing; At receiving terminal, the receiving terminal Wave decomposing multiplexer will be delivered to luminous intensity respectively and survey receiver behind the transmission light wave partial wave of optical fiber link transmission.
In order to suppress the iFWM effect better, the first polarization direction polarised light after first, second light modulator modulates and the second polarization direction polarised light, modulate through first, second phase-modulator again, make adjacent " 1 " the code phase phase difference of pi in the digital signal that loads in the polarised light of same polarization direction respectively, the i.e. phase place phase difference of pi of adjacent " 1 " of the digital signal that loads in the polarised light of first polarization direction sign indicating number, the phase place of adjacent " 1 " of the digital signal that loads in the polarised light of second polarization direction sign indicating number is phase difference of pi also.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (5)
1. suppress the method for nonlinear effect in the high speed wdm optical communication system, it is characterized in that may further comprise the steps:
A10, at the transmitting terminal of described optical communication system, the linearly polarized light of the different wave length that laser is sent generates the first polarization direction polarised light and the second polarization direction polarised light of two-way polarization state quadrature respectively;
The mode of A20, employing polarization state interleaved code type is carried out coded modulation to digital signal, is about to " 1 " sign indicating number difference coded modulation adjacent in the same group of digital signal on the first polarization direction polarised light and the second polarization direction polarised light;
A30, the first polarization direction polarised light and the second polarization direction polarised light of different wave length is combined into the transmission light wave, and after the transmitting terminal wavelength division multiplexer is multiplexing, exports optical fiber link to;
A40, at the receiving terminal of described optical communication system, the transmission light wave exports luminous intensity respectively to and surveys optical receiver behind receiving terminal Wave decomposing multiplexer partial wave.
2. the method that suppresses nonlinear effect in the high speed wdm optical communication system as claimed in claim 1, it is characterized in that, between steps A 20 and steps A 30, increase steps A 205, in steps A 205, make adjacent " 1 " the code phase phase difference of pi in the digital signal that loads in the polarised light of same polarization direction, the i.e. phase place phase difference of pi of adjacent " 1 " of the digital signal that loads in the polarised light of first polarization direction sign indicating number, the phase place of adjacent " 1 " of the digital signal that loads in the polarised light of second polarization direction sign indicating number is phase difference of pi also.
3. high speed wdm optical communication system, comprise transmitting terminal, receiving terminal, transmitting terminal and receiving terminal are connected on the optical fiber link by transmitting terminal wavelength division multiplexer and receiving terminal Wave decomposing multiplexer respectively, transmitting terminal is provided with the laser that is used to produce the different wave length linearly polarized light, receiving terminal is provided with Light-Intensity Detector, it is characterized in that transmitting terminal also is provided with:
The linearly polarized light that polarised light generating apparatus, this device are used for different wave length that laser is sent generates the first polarization direction polarised light and the second polarization direction polarised light of two-way polarization state quadrature respectively;
First, second optical modulator is used to adopt the mode of polarization state interleaved code type that digital signal is carried out coded modulation, is about to " 1 " sign indicating number difference coded modulation adjacent in the same digital signal on the first polarization direction polarised light and the second polarization direction polarised light;
Polarization beam combiner or two-in-one coupler are used for the first polarization direction polarised light and the second polarization direction polarised light of different wave length are combined into the transmission light wave, and export optical fiber link to after the transmitting terminal wavelength division multiplexer are multiplexing;
The receiving terminal Wave decomposing multiplexer will be delivered to luminous intensity respectively and survey receiver behind the transmission light wave partial wave of optical fiber link transmission.
4. high speed wdm optical communication system as claimed in claim 3 is characterized in that also comprising first, second phase-modulator, is respectively applied for adjacent " 1 " the code phase phase difference of pi in the digital signal that loads in the polarised light that makes same polarization direction.
5. as claim 3 or 4 described high speed wdm optical communication systems, it is characterized in that described polarised light generating apparatus is polarization beam apparatus, splitter, optical switch or polarization rotator.
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| WO2023186139A1 (en) * | 2022-03-31 | 2023-10-05 | 华为技术有限公司 | Optical communication method, apparatus and system |
| CN117478234A (en) * | 2023-12-27 | 2024-01-30 | 无限光通讯(深圳)有限公司 | Cross wavelength modulation method and system based on wavelength division multiplexer |
| CN117478234B (en) * | 2023-12-27 | 2024-04-05 | 无限光通讯(深圳)有限公司 | Cross wavelength modulation method and system based on wavelength division multiplexer |
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