CN1412966A - Optical fiber dispersion compensation method and its device - Google Patents
Optical fiber dispersion compensation method and its device Download PDFInfo
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- CN1412966A CN1412966A CN01135672A CN01135672A CN1412966A CN 1412966 A CN1412966 A CN 1412966A CN 01135672 A CN01135672 A CN 01135672A CN 01135672 A CN01135672 A CN 01135672A CN 1412966 A CN1412966 A CN 1412966A
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Abstract
The fibre dispersion compensation equipment includes dispersion compensation module, and includes a three-port irreversible optical device and an optical reflector device. Said three-port irreversible optical device, dispersion compensation module and ptical reflector device are sequentially connected, the optical signal is fed into first port of the above-mentioned three-port irrevesible optical device, and outputted from second port and fed into dispersion compensation module to make dispersion compensation, then reflected by optical reflector device and fed into dispersion compensation module again to make secondary dispersion compensation, then said optical signal is fed into second port, and is outputted from third port, and fed into the dispersion compensation module, so that it can greatly raise utilization rate of dispersion compensation optical fibre.
Description
Technical field
The invention belongs to the dispersion compensation technical field of light, be specifically related to a kind of dispersion compensation method of the utilance that can improve dispersion compensating fiber and realize the device of this method.
Background technology
Along with dense wave division multipurpose (DWDM) is the development of the Fibre Optical Communication Technology on basis, dispersion compensating fiber (DCF) has been widely used in dwdm system as the most ripe dispersion compensation technology.Existing dispersion compensation device generally all is that light signal is input to dispersion compensating fiber one end, utilize dispersion compensating fiber to carry out single compensation after, from other end output, transmit then.In order to improve the transmission performance of light, generally all be to realize by the abbe number that improves dispersion compensating fiber, so not only can shorten the length of dispersion compensating fiber, reduce the volume of dispersion compensation device, and can reduce system cost.But its shortcoming is the raising of optical fiber dispersion coefficient, the waveguide dispersion that needs to increase optical fiber obtains, refraction index profile to material has very high requirement like this, though can realize in theory, but to the manufacture process requirement height, difficulty is big, and the method for raising abbe number is lower to the utilance of dispersion compensating fiber.
Summary of the invention
Purpose of the present invention just is the shortcoming according to prior art, a kind of method of dispersion compensation is provided, under the certain situation of the length of dispersion compensating fiber and abbe number, fully improve the utilance of dispersion compensating fiber, thereby reduce the cost of dispersion compensation device.
Another object of the present invention just provides a kind of dispersion compensation device of realizing above-mentioned dispersion compensation method.
According to an aspect of the present invention, provide a kind of dispersion compensation method, this method may further comprise the steps:
A, utilize dispersion compensation module that input optical signal is carried out the dispersion compensation first time;
B, will carry out the dispersion compensation second time, then output through the light signal reflected back dispersion compensation module of a dispersion compensation.
In the above-mentioned dispersion compensation method,, make the input port of light signal and separately through the light signal output end mouth behind twice dispersion compensation by one the three irreversible optics of port is set.
According to a further aspect in the invention, a kind of optical fiber dispersion compensation device of realizing above-mentioned dispersion compensation method is provided, this device is except that comprising dispersion compensation module, also comprise an irreversible optics of one or three ports and an optical reflection device, the irreversible optics of described three ports, dispersion compensation module and optical reflection device are linked in sequence, light signal enters from first port of the irreversible optics of three ports, output to dispersion compensation module from second port and carry out dispersion compensation, then through the reflection of optical reflection device, enter dispersion compensation module once more and carry out the secondary dispersion compensation, behind twice dispersion compensation, light signal is injected from second port of the irreversible optics of described three ports again, through the 3rd port output dispersion compensation device.
Above-mentioned dispersion compensation device, the irreversible optics of described three ports is an optical circulator, also can be directional coupler;
Above-mentioned dispersion compensation device, described optical reflection device is a fiber loop mirror, also can be end mirror, can also be chirp grating.
Because dispersion compensation method provided by the invention and device will carry out the dispersion compensation second time through the light signal reflected back dispersion compensation module of a dispersion compensation, therefore improved the utilance of dispersion compensating fiber greatly, abbe number and dispersion compensation at dispersion compensating fiber require under certain situation, can shorten the length of dispersion compensating fiber greatly, therefore reduce the cost of device.Simultaneously, can also combine, improve the signal to noise ratio of transmission signals, combine, meticulous compensation is carried out in the transmission link chromatic dispersion, improve transmission performance with chirp grating with fiber loop mirror.
Description of drawings
Fig. 1 optical fiber dispersion compensation structure drawing of device of the present invention;
The optical fiber dispersion compensation device embodiment that Fig. 2 the present invention one utilizes optical circulator and fiber loop mirror to realize;
The optical fiber dispersion compensation device embodiment that Fig. 3 the present invention one utilizes optical circulator and end mirror to realize;
The optical fiber dispersion compensation device embodiment that Fig. 4 the present invention one utilizes optical circulator and chirp grating to realize;
Fig. 5 chirp grating structure and fundamental diagram;
Fig. 6 utilizes the dispersion compensation schematic diagram of the optical fiber dispersion compensation device embodiment of chirp grating realization;
The optical fiber dispersion compensation device embodiment that Fig. 7 utilizes directional coupler and fiber loop mirror to realize.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
The dispersion compensation device general structure that the present invention proposes as shown in Figure 1.This dispersion compensation device comprises the irreversible optics of one three port 1,2 and optical reflection devices 3 of dispersion compensation module (DCM).The irreversible optics 1 of three ports, dispersion compensation module 2 and optical reflection device 3 are linked in sequence, that is: first port of the irreversible optics 1 of three ports links to each other with the input transmission channel, and the output transmission channel is connected with the 3rd port.Second port links to each other with dispersion compensation module (DCM) 2, is thereafter an optical reflection device 3.The light signal of transmission channel is from first port input of the irreversible device 1 of three ports, be input to dispersion compensation module 2 through second port and carry out the dispersion compensation first time, export after 3 reflections of optical reflection device from dispersion compensation module, light signal turns back to dispersion compensation module 2 through original optical path, carry out the dispersion compensation second time, inject through second port of the irreversible optics 1 of three ports then,, be passed to transmission channel and carry out follow-up transmission from its 3rd port output dispersion compensation device.
Dispersion compensation module among the present invention (DCM) 2 is existing general dispersion compensation device, it is except comprising dispersion compensating fiber (DCF), generally also comprise a section single-mould fiber (SMF), in addition, because dispersion compensating fiber core diameter area is less, and SMF fiber cores footpath area is bigger, for reducing the junction loss of the two, also need to adopt coupling technique that two sections optical fiber are coupled, owing to existing dispersion compensation device is well known to those skilled in the art, so do not describe in detail at this.
Therefore by novel dispersion compensation device provided by the invention, light signal can pass through dispersion compensation module 2 twice, and light signal has been carried out twice dispersion compensation continuously.Therefore, under the situation that dispersion compensation requires necessarily and the dispersion compensation coefficient is certain, the present invention is by improving the utilance of dispersion compensation module 2, dispersion compensating fiber in the dispersion compensation module 2 (DCF) length can be reduced half, dwindle the volume of dispersion compensation device, reduced the transmission system cost.This dispersion compensation device by full-fledged several ordinary optical devices form, realize easily, with low cost, and have the broadband chromatic dispersion compensation characteristic, therefore can extensive use and various fiber optic transmission system in.
Fig. 2 has provided the embodiment one of dispersion compensation device.In the present embodiment, what the irreversible optics 1 of three ports adopted is optical circulator 4, and what optical reflection device 3 adopted is a fiber loop mirror 5 with two ports.As shown in Figure 2, first port of optical circulator 4 is connected with the input transmission channel as the input port of dispersion compensation device, and second port is connected with dispersion compensation module (DCM) 2, the 3rd port is connected with the output transmission channel as the output of dispersion compensation device.Fiber loop mirror 5 is made of the directional coupler that a two-port is welded together, and one of them port is connected with dispersion compensation module (DCM), and the another port is with non-reflector port 6 terminations.When light signal enters fiber loop mirror when coupler is divided into two-way, produce a phase difference at coupling unit, through behind the fiber loop mirror 5, two ways of optical signals produces in coupler section interferes, and is equivalent to a filter, therefore by appropriate design coupling unit length, can make from input port and be input to light signal the fiber loop mirror 5 through after interfering, still from former input port output, so both can realize the light reflection, can improve the isolation of interchannel again.Therefore, utilize the dispersion compensation compensation arrangement that constitutes by fiber loop mirror 5, when efficiently utilizing dispersion compensation module (DCM) 2 to realize dispersion compensation, can also improve the channel signal signal to noise ratio, thereby improve the system transmissions performance.
Fig. 3 has provided the embodiment two of dispersion compensation device.In this embodiment, the irreversible optics 1 of three ports still adopts optical circulator, and each port connected mode is with embodiment one, and what optical reflection device 3 adopted is an end mirror 7.Whole dispersion compensation device operation principle is identical with embodiment one, is not described in detail in this.Usually, end mirror 7 can plate the film that is all-trans at the fiber-optic output face and realize then by the fiber-optic output face is polished.With present coating technique, this film that is all-trans realizes easily, and its reflectivity can reach more than 99.9% at least, so its loss that causes is very little.As seen the dispersion compensation device that adopts this method to constitute, it is little to have a loss of insertion, characteristics such as realizes, volume is little easily.
Fig. 4 has provided the embodiment three of dispersion compensation device.In embodiment three, the irreversible optics of three ports 1 adopts is still optical circulator 4, and each port connected mode is with embodiment one, and what optical reflection device 3 adopted is a chirp grating 8.Chirp grating 8 can be by the ultraviolet irradiation fiber core, induces refraction index changing and forms.When chirp grating 8 work, wavelength reflects along the fiber length translation, makes different wave length reflecting successively along the different position of fiber lengths, promptly warble, so chirp grating 8 also can be used for dispersion compensation.The structure of chirp grating 8 and operation principle are as shown in Figure 5.Among Fig. 5, with five wavelength light signals is example, light signal λ 1, the λ 2, λ 3, λ 4, the λ 5 that incide chirp grating 8 from dispersion compensation module (DCM) 2 are reflected back to its input (wherein λ 1＞λ 2＞λ 3＞λ 4＞λ 5) successively, thereby realize reflection function.
Usually, except locating in predefined wavelength X 0 (as shown in Figure 6), can compensate by dispersion compensation module (DCM) 2, it is presented outside zero chromatic dispersion, because only is-symbol is opposite for the chromatic dispersion gradient of transmission channel chromatic dispersion gradient and dispersion compensation module (DCM) 2, also inequality on absolute value, then only can not reach dispersion slope compensation by dispersion compensation module (DCM) 2, therefore all non-vanishing in other arbitrary wavelength place's residual dispersions.If dispersion compensation module (DCM) 2 combined with the dispersion compensation characteristic of chirp grating 8, carry out dispersion compensation jointly, just can realize dispersion slope compensation.Fig. 6 has provided the dispersion compensation device dispersion compensation schematic diagram that utilizes chirp grating 8 to constitute.Transverse axis is a signal wavelength, and the longitudinal axis is an abbe number.The dispersion characteristics of the curve representation transmission channel that numeral 9 refers to; The curve of numeral 10 representatives is the dispersion characteristics of dispersion compensation module (DCM) 2; The curve representation of numeral 11 representatives is in the residual dispersion characteristic that adopts on the transmission channel after dispersion compensation module (DCM) 2 carries out dispersion compensation; The curve representation of numeral 12 representatives has the dispersion characteristics of the chirp grating 8 of negative dispersion slope.As seen, if the chromatic dispersion gradient 12 by design chirp grating 8 equates it, and opposite in sign just with residual dispersion slope 11 absolute values, then can realize the dispersion slope compensation of transmission channel.By changing refractive index, the grating cycle of chirp grating 8 can be designed as from the incident end and reduces gradually to the right side, make light signal in the reflection of the place of more close incident end with long wavelength more, as shown in Figure 5, the chromatic dispersion gradient of chirp grating 8 can be negative value like this, in the design by some relevant parameters, just can obtain the chromatic dispersion gradient that equates with 11 opposite in signs but absolute value, thereby all be compensated for as the chromatic dispersion at the arbitrary wavelength of transmission channel place zero.Therefore, in the dispersion compensation module of this structure, chirp grating 8 not only plays the speculum effect, and has played the effect of meticulous dispersion compensation.
Fig. 7 has provided the embodiment four of dispersion compensation device.In embodiment four, adopt a directional coupler 13 (as being the fiber coupler of a 3dB) to replace above-mentioned optical circulator 4.Two ports on directional coupler 13 left sides are the first, the 3rd port of this directional coupler, correspond respectively to first port and the 3rd port of optical circulator 4, two ports on the right are the second, the 4th port, second port of its second port correspondence and optical circulator, the 4th port is with a non-reflector port termination.Optical reflection device 3 still adopts fiber loop mirror 5, and the connected mode of whole dispersion compensation module and operation principle and embodiment one are basic identical.Owing to adopted directional coupler 13, will inevitably bring the loss of about 3dB, but this loss can by image intensifer will with the compensation, amplifier can be placed on the input or the output of dispersion compensation device, because implementation structure is fairly simple, so do not draw in the accompanying drawings.
In conjunction with four embodiment the present invention being had been described in detail above, is not that protection scope of the present invention is limited but be construed as foregoing description, and other carry out the modification of unsubstantiality to the present invention all should be within protection scope of the present invention.When adopting directional coupler 13 as the irreversible optics 1 of three ports, optical reflection device 3 can adopt end mirror 7 or chirp grating 8 to realize, the operation principle of its principle of this combination corresponding construction form when adopting circulator is identical, therefore is not repeated.
Claims (8)
1, a kind of optical fiber dispersion compensation method is characterized in that may further comprise the steps:
A, utilize dispersion compensation module (2) that input optical signal is carried out the dispersion compensation first time;
B, will carry out the dispersion compensation second time, then output through the light signal reflected back dispersion compensation module (2) of a dispersion compensation.
2, dispersion compensation method as claimed in claim 1 is characterized in that: by one the three irreversible optics of port (1) is set, make the input port of light signal and through the light signal output end mouth behind twice dispersion compensation separately.
3, a kind of optical fiber dispersion compensation device of realizing dispersion compensation method as claimed in claim 1, comprise dispersion compensation module (2), it is characterized in that: also comprise an irreversible optics of one or three ports (1) and an optical reflection device (3), the irreversible optics of described three ports (1), dispersion compensation module (2) and optical reflection device (3) are linked in sequence, light signal enters from first port of the irreversible optics of three ports (1), output to dispersion compensation module (2) from second port and carry out dispersion compensation, then through the reflection of optical reflection device (3), enter dispersion compensation module (2) once more and carry out the secondary dispersion compensation, behind twice dispersion compensation, light signal is injected from second port of the irreversible optics of described three ports (1) again, through the 3rd port output dispersion compensation device.
4, dispersion compensation device as claimed in claim 3 is characterized in that: the irreversible optics of described three ports (1) are optical circulator (4).
5, dispersion compensation device as claimed in claim 3 is characterized in that: the irreversible optics of described three ports (1) are directional coupler (13).
6, as claim 3,4 or 5 described dispersion compensation devices, it is characterized in that: described optical reflection device (3) is a fiber loop mirror (5).
7, as claim 3,4 or 5 described dispersion compensation devices, it is characterized in that: described optical reflection device (3) is an end mirror (7).
8, as claim 3,4 or 5 described dispersion compensation devices, it is characterized in that: described optical reflection device (3) is a chirp grating (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN01135672A CN1412966A (en) | 2001-10-17 | 2001-10-17 | Optical fiber dispersion compensation method and its device |
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| CN01135672A CN1412966A (en) | 2001-10-17 | 2001-10-17 | Optical fiber dispersion compensation method and its device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797998B (en) * | 2004-12-27 | 2011-05-11 | 株式会社日立制作所 | Dispersion compensation device and dispersion compensation method |
| CN102255666A (en) * | 2010-05-18 | 2011-11-23 | 昂纳信息技术（深圳）有限公司 | Dispersion compensator |
| CN106324751A (en) * | 2016-10-11 | 2017-01-11 | 中国电子科技集团公司第五十研究所 | Dispersion compensation device for eliminating effects of polarization of external environment on general optical fiber |
-
2001
- 2001-10-17 CN CN01135672A patent/CN1412966A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797998B (en) * | 2004-12-27 | 2011-05-11 | 株式会社日立制作所 | Dispersion compensation device and dispersion compensation method |
| CN102255666A (en) * | 2010-05-18 | 2011-11-23 | 昂纳信息技术（深圳）有限公司 | Dispersion compensator |
| WO2011143838A1 (en) * | 2010-05-18 | 2011-11-24 | 昂纳信息技术（深圳）有限公司 | Dispersion compensator |
| CN106324751A (en) * | 2016-10-11 | 2017-01-11 | 中国电子科技集团公司第五十研究所 | Dispersion compensation device for eliminating effects of polarization of external environment on general optical fiber |
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