CN2411469Y - Optical dispersion compensator used in high speed transmission system - Google Patents
Optical dispersion compensator used in high speed transmission system Download PDFInfo
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- CN2411469Y CN2411469Y CN00204252U CN00204252U CN2411469Y CN 2411469 Y CN2411469 Y CN 2411469Y CN 00204252 U CN00204252 U CN 00204252U CN 00204252 U CN00204252 U CN 00204252U CN 2411469 Y CN2411469 Y CN 2411469Y
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- dispersion compensator
- fiber grating
- optical dispersion
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Abstract
The utility model discloses an optical dispersion compensator used in high speed transmission systems, which comprises a light input end and a light output end; the dispersion compensator is positioned between the light input end and the light output end. The dispersion compensator comprises a multi-port light path guiding device and a chirped fiber grating, wherein, one input end of the multi-port light path guiding device is used as the light input end of the whole optical dispersion compensator; one output end is used as the light output end of the whole optical dispersion compensator; one input-output end is connected with the chirped fiber grating. The utility model has the advantages of small non-linear effect, low cost and small insertion loss when in dispersion compensation, and is especially suitable for the situation when the number of the light wavelength is smaller.
Description
The optical dispersion compensator of (10Gbit/s and more than) transmission system that the utility model relates to a kind of being used at a high speed.
Existing present, realize that in high-speed optical transmission system the dispersion compensation technology of practicability mainly is the dispersion compensating fiber penalty method.Dispersion compensating fiber can be divided into single mode (LP on principle of work
01Mould) dispersion compensating fiber and bimodulus (LP
01+ LP
11Mould) dispersion compensating fiber.The bimodal dispersion compensated optical fiber utilizes LP
11Mould is near cutoff wavelength the time, and mould power major part is distributed in the covering, can produce very big negative wave and lead chromatic dispersion, and chromatic dispersion gradient also bears, and can compensate the G.652 positive dispersion and the positive dispersion slope of optical fiber, realizes broadband compensation.The compensation ability of this dispersion compensating fiber is stronger, but a big shortcoming that limits its application is that it must utilize a spatial mode converter, it is not too convenient to use, and now except the minority environment, the bimodal dispersion compensated optical fiber is replaced by the triple clad dispersion compensating fiber of single mode gradually.
In fact single mode dispersion compensating fiber method is exactly with one section optical fiber that very big negative dispersion is arranged at 1.55um wavelength window place, G.652 it is inserted offset the G.652 positive dispersion of optical fiber in the fibre system, as follows with mathematical expression:
D
Total=D
SMFL
SMF+ D
DCFL
DCFD in=0 formula
SMF, D
DCFBe respectively G.652 optical fiber and dispersion compensating fiber at the abbe number at 1.55um place, and L
SMF, L
DCFBe respectively the length of two kinds of optical fiber.Therefore, carrying out the dispersion compensating fiber length that dispersion compensation will add satisfies:
L
DCF/ L
SMF=D
SMF/ D
DCF(D herein
DCFTake absolute value) again since G.652 optical fiber have positive chromatic dispersion gradient (2nd order chromatic dispersion) D '
SMF, in order to be applicable to wavelength-division multiplex system, realize wideband transmit, require the dispersion compensating fiber can be at chromatic dispersion gradient D ' in 1.55um wavelength window environs
DCFOn also can offset G.652 CHROMATIC DISPERSION IN FIBER OPTICS, this just requires near two kinds of CHROMATIC DISPERSION IN FIBER OPTICS slope ratios the 1.55um wavelength to satisfy:
L
DCF/L
SMF＝D
SMF/D
DCF＝D′
SMF/D
DCF
D herein
DCF, D '
DCFTake absolute value.The shortcoming of above-mentioned dispersion compensating fiber is: the compensation ability of dispersion compensating fiber is relatively low, there is tangible nonlinear effect, and because the existence of its chromatic dispersion gradient, feasible light for different wave length, its chromatic dispersion compensation quantity difference, when being applied to dense wave division multipurpose (DWDM) system, be necessary its chromatic dispersion gradient is compensated, this has limited its application to a certain extent.And the decay to flashlight of dispersion compensating fiber is very big, i.e. its insertion loss is bigger, and this also is the shortcoming of dispersion compensating fiber.In addition, the price of dispersion compensating fiber is very high at present, and it is too high to be applied to single wave system system cost.
The purpose of this utility model is exactly in order to overcome the above problems, and a kind of optical dispersion compensator is provided, and compensation ability is strong and nonlinear effect is little with the insertion loss, and cost is low.
The utility model realizes that the above-mentioned purpose scheme is: a kind of optical dispersion compensator that is used for high speed transmission system, comprise light input end, light output end, between light input end, light output end dispersion compensation device is arranged, it is characterized in that: described dispersion compensation device comprises multiterminal light path guide device and chirped fiber grating; An input end of described multiterminal light path guide device is as the light input end of whole optical dispersion compensator, and an one output terminal is as the light output end of whole optical dispersion compensator, an one input and output termination chirped fiber grating.
Owing to adopted above scheme, use chirped fiber grating element by way of compensation, it has very little insertion loss and stronger dispersion compensation ability; And the nonlinear effect of chirped fiber grating is less, and cost is lower.Therefore, the dispersion compensator of being made up of it can solve that dispersive optical fiber is serious as the nonlinear effect of dispersion compensation time spent, cost is than problems such as height, is the better dispersion compensation schemes of the above two-forty fibre-optic transmission system (FOTS) of 10Gbit/s.
Fig. 1 is the synoptic diagram of the utility model embodiment one.
Fig. 2 is the utility model embodiment one cascade mode synoptic diagram.
Fig. 3 is the utility model embodiment two synoptic diagram.
Fig. 4 is the utility model embodiment three synoptic diagram.
Fig. 5 is the utility model embodiment four synoptic diagram.
Fig. 6 is the utility model embodiment five synoptic diagram.
Also in conjunction with the accompanying drawings the utility model is described in further detail below by specific embodiment.
The general thought of optical dispersion compensator is as follows: see Fig. 1,3, it comprises light input end 3, light output end 4, between light input end 3, light output end 4 dispersion compensation device is arranged, it is characterized in that: described dispersion compensation device comprises multiterminal light path guide device 1,8 and chirped fiber grating 2; An input end of described multiterminal light path guide device 1,8 is as the light input end 3 of whole optical dispersion compensator, and an one output terminal is as the light output end 4 of whole optical dispersion compensator, an one input and output termination chirped fiber grating 2.So-called herein multiterminal light path guide device is meant a plurality of light inputs, output port and light can be guided to the optical device of different output ports from the light of different port inputs, it has one or more input ends, one or more output terminals, one or more input/output terminals (promptly not only can do input end but also can do output terminal or input light be arranged simultaneously and the two-way end of input light).
The principle of chirped fiber gratings is: for the light pulse of a dispersive broadening of transmitting in optical fiber, short wavelength's component is positioned at pulse front edge, and long wavelength's component is positioned at the back edge of pulse; For chirped fiber grating, long wavelength's component is coupled to the backpropagation mould at the front end of grating, and short wavelength's component is coupled to the reverse transfer mould in the rear end of fiber grating, and at the input end of grating, the relative delay between two components is:
Δ=2L
g/ V
g(L wherein
gBe the length of chirped fiber grating, V
gBe effective group velocity).This time delay can be adjusted to that to make it the time delay equal and opposite in direction, the direction that are produced with Optical Fiber Transmission opposite, thereby reach the purpose of dispersion compensation.
Be several embodiment of the present utility model below.
Embodiment one: as Fig. 1, and the guide device of multiterminal light path described in this example the 1, the 8th, optical circulator 1.Flashlight is from an input end input of optical circulator, an output terminal links to each other with chirped fiber grating, flashlight enters chirped fiber grating after an output terminal output, reenter an output terminal after the chirped fiber grating reflection, at last from an input/output terminal output.This light path can realize the dispersion compensation of single wavelength or two wavelength signals light.This is mainly determined by the reflectance spectrum bandwidth of chirped fiber grating.The reflectance spectrum bandwidth of chirped fiber grating is generally 0.5nm, and (bandwidth is relevant with chromatic dispersion compensation quantity, and compensation rate is big more, and general bandwidth is narrow more to 1.0nm.), therefore can only compensate one or two wavelength.
As Fig. 2,, can realize the multi-wavelength dispersion compensation of channels by the mode of cascade if the bandwidth of chirped fiber grating and transmission spectrum meet certain requirements.This wavelength also can be used for the optical add/drop multiplexer (OADM---Optical Add/Drop Multiplexer) of fixed wave length, finishes the add drop multiplex of dispersion compensation and optical wavelength simultaneously.As shown in Figure 2, be example to compensate three wavelength.Three wavelength that transmit in same optical fiber are via the reflection of first optical circulator 1 and chirped fiber grating 2, can below first wavelength after the compensation of loosing that fades, and first chirped fiber grating 2 is crossed in second wavelength and three-wavelength transmission, via falling second wavelength under second optical circulator 1 and chirped fiber grating 2 reflections, second chirped fiber grating crossed in the three-wavelength transmission, via the 3rd optical circulator 1 and chirped fiber grating reflection, the three-wavelength after the diffusing compensation of fading down.
Embodiment two: the guide device of multiterminal light path described in this example the 1, the 8th, photo-coupler 8.The employing splitting ratio is that 50: 50 coupling mechanism 8 combines with chirped fiber grating 2, also can constitute dispersion compensator.Its light channel structure as shown in Figure 3.Saved the higher optical circulator 1 of cost in this structure, its function is identical with first kind of implementation.Cascade can be finished the dispersion compensation of a plurality of wavelength equally, is applied to dense wavelength division multiplexing system, can also constitute the optical add/drop multiplexer of fixed wave length, reaches dispersion compensation and optical wavelength add drop multiplex.
This light path is a kind of Dispersion Compensation Systems cheaply, but compares with first kind of implementation, and its insertion loss is big, and more than 6dB, and the insertion loss of first kind of implementation has only about 2dB.Therefore realize dispersion compensation with lower cost and to Insertion Loss under the less demanding occasion, this light path has stronger competitive power in hope.
Embodiment three: this structure as shown in Figure 4, described chirped fiber grating 2 is fixed on the piezoelectric ceramics 5, piezoelectric ceramics 5 links to each other with regulated power supply 6.By regulating the voltage of piezoelectric ceramics 5, can change the flexible of piezoelectric ceramics 5, chirped fiber grating 2 will stretch thereupon, thereby change the chromatic dispersion compensation quantity of chirped fiber grating 2, reach the tunable purpose of dispersion measure.
This structure can realize that dispersion measure in a big way is tuning, and wave length shift can be less than 0.5nm.The driving voltage of piezoelectric ceramics is 100～300V.
Embodiment four: this structure as shown in Figure 5, it is that steel structure support 7 two sides link to each other with the two ends of chirped fiber grating 2 again on the steel structure support 7 both sides inwalls of U type that described piezoelectric ceramics 5 two ends place xsect respectively.This structure has avoided using very long piezoelectric ceramics 5 to carry out tuning to the dispersion measure of chirped fiber grating 2.The long bigger driving power of piezoelectric ceramics 5 inevitable requirements also requires its temperature coefficient even, otherwise can make certain instability of tuning existence or unevenness.Problems such as therefore, this structure can solve the quality requirements of piezoelectric ceramics 5 higher, and driving power requires bigger, and homogeneity is not so good.Use this structure, general piezoelectric ceramics just can guarantee that dispersion compensator has better tuning performance, reduces the cost of piezoelectric ceramics 5 simultaneously.
Embodiment five: see Fig. 6, this is actually the application of the utility model on laser instrument.Utilize the chirped fiber grating 2 and the laser instrument of directly modulation to constitute light emission module, can reach long transmission range, its principle is to utilize the chirp value opposite in sign of chirped fiber grating 2 and direct modulated laser, balance out the directly chirp value of modulation of laser instrument, and light pulse carried out certain compression, reach long transmission range.Its principle assumption diagram is illustrated in fig. 6 shown below.
The result who utilizes embodiment one to carry out dispersion compensation shows that the compensation effect of this schemochrome dispersion compensator is tangible.Fig. 7 a, 7b are respectively to carry out the eye diagram data behind the dispersion compensation with single wavelength signals light transmission 125km of the 1554.83nm of 10Gbit/s speed rates non-return-to-zero (NRZ) sign indicating number type and 175km; Uncompensated eye pattern when Fig. 8 is transmission 100Km (uncompensated eye pattern worsens fully during transmission 125km, and its figure slightly).There is the prechirp of compensation 75km dispersion measure in flashlight.Can clearly be seen that from figure during transmission 175km, eye diagram quality is also relatively good.Comparison diagram 7a, 7b and Fig. 8 can find that the compensation effect of this schemochrome dispersion compensator is tangible.This shows that this compensation scheme is effective.
When using, reality must note, the bandwidth of chirped fiber grating 5 is narrower, being applied to dense wavelength division multiplexing system (DWDM) needs a plurality of chirped fiber gratings to aim at different wavelength respectively, so compensator of the present utility model is particularly suitable for the situation of light wave long number less (4 ripples are following).In addition, certain drift can take place with temperature in the reflectance spectrum of chirped fiber grating 2, makes when it uses in the unstable temperature environment, must be noted that and carries out temperature compensation.
Claims (5)
1, a kind of optical dispersion compensator that is used for high speed transmission system, comprise light input end (3), light output end (4), between (4) dispersion compensation device is arranged at light input end (3), light output end, it is characterized in that: described dispersion compensation device comprises multiterminal light path guide device (1,8) and chirped fiber grating (2); An input end of described multiterminal light path guide device (1,8) is as the light input end (3) of whole optical dispersion compensator, an one output terminal is as the light output end (4) of whole optical dispersion compensator, an one input and output termination chirped fiber grating (2).
2, the optical dispersion compensator that is used for high speed transmission system as claimed in claim 1 is characterized in that: described multiterminal light path guide device (1,8) is optical circulator (1).
3, the optical dispersion compensator that is used for high speed transmission system as claimed in claim 1 is characterized in that: described multiterminal light path guide device (1,8) is photo-coupler (8).
4, as claim 1 or the 2 or 3 described optical dispersion compensators that are used for high speed transmission system, it is characterized in that: described chirped fiber grating (2) is fixed on the piezoelectric ceramics (5), and piezoelectric ceramics (5) links to each other with regulated power supply (6).
5, the optical dispersion compensator that is used for high speed transmission system as claimed in claim 4, it is characterized in that: it is that steel structure support (7) two side links to each other with the two ends of chirped fiber grating (2) again on steel structure support (7) the both sides inwall of U type that described piezoelectric ceramics (5) two ends place xsect respectively.
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|---|---|---|---|
| CN00204252U CN2411469Y (en) | 2000-03-06 | 2000-03-06 | Optical dispersion compensator used in high speed transmission system |
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| CN00204252U CN2411469Y (en) | 2000-03-06 | 2000-03-06 | Optical dispersion compensator used in high speed transmission system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100337136C (en) * | 2001-12-23 | 2007-09-12 | 华为技术有限公司 | On-line dispersion compensation device of wavelength division high-speed optical transmission system |
| CN101499856B (en) * | 2008-01-29 | 2012-06-20 | 佳能株式会社 | Optical pulse compressor |
| CN109031652A (en) * | 2018-09-11 | 2018-12-18 | 国网安徽省电力有限公司蚌埠供电公司 | A kind of low-loss optically communication dispersion compensator and its dispersion compensation method |
-
2000
- 2000-03-06 CN CN00204252U patent/CN2411469Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100337136C (en) * | 2001-12-23 | 2007-09-12 | 华为技术有限公司 | On-line dispersion compensation device of wavelength division high-speed optical transmission system |
| CN101499856B (en) * | 2008-01-29 | 2012-06-20 | 佳能株式会社 | Optical pulse compressor |
| CN109031652A (en) * | 2018-09-11 | 2018-12-18 | 国网安徽省电力有限公司蚌埠供电公司 | A kind of low-loss optically communication dispersion compensator and its dispersion compensation method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: PATENTEE; FROM: SHENZHEN HUAWEI TECHNOLOGY CO., LTD TO: HUAWEI TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Shenzhen science and Technology Park, HUAWEI road user service center building, HUAWEI Technology Co., Ltd. Intellectual Property Department Patentee after: Huawei Technologies Co., Ltd. Address before: Shenzhen science and Technology Park, HUAWEI road user service center building, Shenzhen HUAWEI Technology Co., Ltd. Intellectual Property Department Patentee before: Huawei Technology Co., Ltd., Shenzhen City |
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| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20001220 |