CN107276676A - A kind of static wavelength crossed dispersion compensation method and link - Google Patents
A kind of static wavelength crossed dispersion compensation method and link Download PDFInfo
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- CN107276676A CN107276676A CN201610212987.2A CN201610212987A CN107276676A CN 107276676 A CN107276676 A CN 107276676A CN 201610212987 A CN201610212987 A CN 201610212987A CN 107276676 A CN107276676 A CN 107276676A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
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Abstract
The invention discloses a kind of static wavelength crossed dispersion compensation method and link, it is related to optical communication field.Technical key point：Single fiber bi-directional or double-fiber two-way communication are carried out by optical fiber between two communication points, n sections of isometric same model optical fiber are laid between two communication points, n is non-zero even number；And on optical signal up direction, the 1st, 3,5 ... the wavelength of optical signal transmitted on 1 section of optical fiber of n is λ 1, the 2nd, 4,6 ..., the wavelength of optical signal that transmits on n section optical fiber be λ 2；On optical signal down direction, the 1st, 3,5 ... the wavelength of optical signal transmitted on 1 section of optical fiber of n is λ 2, the 2nd, 4,6 ..., the wavelength of optical signal that transmits on n section optical fiber be λ 1；1 ＜ λ of λ 0 ＜ λ 2, λ 0 are zero-dispersion wavelength of the model optical fiber etc..
Description
Technical field
The present invention relates to optical communication field, especially a kind of Passively compensated skill of long-distance optical fiber wavelength dispersion
Art.
Background technology
When fibre-optical dispersion refers to that the light of different colours (different frequency) is transmitted in a fiber, due to difference
Spread speed and be separated from each other.These dispersions can all cause optical pulse broadening, signal is produced in transmission
Distortion and increase signal error rate.
The dispersion of single-mode fiber is mainly group delay dispersion, i.e. waveguide dispersion and material dispersion.Material dispersion is
Refer to showing due to transmission or the group velocity change that the change of frequency causes medium refraction index to change and causes
As；Waveguide dispersion refers to due to the transmission or group velocity that the change of frequency causes waveguide parameter to change and causes
Spend the phenomenon of change.So-called group velocity is exactly the transmission speed of luminous energy in a fiber.In a fiber, not at the same speed
The signal of degree transmits same distance and has different time delays, so as to produce delay inequality, delay inequality can be by signal
The transmission speed of each frequency content is different caused.Delay inequality is bigger, represents that dispersion is more serious.Thus, often
Degree of dispersion is represented with delay inequality.Total dispersion in single-mode fiber is made up of material dispersion, waveguide dispersion etc.,
They are all relevant with wavelength, so the total dispersion of single-mode fiber is also referred to as wavelength dispersion.The dispersion master of single-mode fiber
Represented with abbe number, abbe number is exactly two light wave transmissions 1km that two wavelength intervals are 1nm
The difference of length of fibre arrival time, unit is ps/ (nmkm).
Since fiber optic communication commercialization starts, so far more than 20 year, conventional single mode light has largely been laid both at home and abroad
The optical cable of fine (G.652), when this kind of optical cable is operated in 1550nm wave bands, there is the color of (16.5ps/nm.km)
Dissipate, the principal element as influence repeater span.So, must to the fibre-optic transmission system (FOTS) of high-speed long range
Dispersion compensation problem need be considered.
G.652 as shown in table 1, G.652 fiber dispersion slope is in 0.020ps/ for the abbe number of optical fiber
(nm2.km)~0.090ps/ (nm2.km change between), exist certain non-linear.
The non-linear citing of table 1, G.652 fiber dispersion coefficient
Too high dispersion causes the error code of fiber optical digital transmission system and the increase of the bit error rate, causes simulation system
The distortion of signal and the reduction of signal to noise ratio.Therefore, after the attenuation problem of optical fiber is resolved, dispersion by
Limit has reformed into a subject matter for determining fibre-optic transmission system (FOTS) transmission range.
Solving signal chromatic dispersion causes the method for differential group delay to be exactly dispersion compensation technology.Using dispersion compensation light
Fine (DCF) dispersion of transmission line is compensated be a comparative maturity technology.Dispersion compensation
Optical fiber (DCF) is a kind of special optical fiber, and its chromatic dispersion is negative value, just with G.652 optical fiber on the contrary,
The influence of G.652 conventional dispersion can be offset, its abbe number representative value is -90ps/ (nmKm), thus
Dispersion compensating fiber need to only account for the 1/5 of the G.652 length of optical fiber in total line length, you can make total optical fiber
The dispersion values of link are close to zero.But the attenuation of dispersion compensating fiber big (about 0.5dB/km), it is necessary to
Compensated using image intensifer (EDFA), and serious nonlinear effect is produced to strong light.Therefore, adopt
Had the characteristics that with the negative dispersion optical fiber compensation technique of dispersion compensating fiber (DCF)：Using passive device,
Technology maturation, using with it is easy to maintenance.But cost is high, insertion decay is big, big to non-linear effects.
In addition, also other kinds of dispersion compensator, does for example with chirped fiber grating (CFBG)
Dispersion compensation, and compress dispersion using nonlinear optical effect, i.e., using one of Kerr effects from phase
Position modulation (SPM) characteristic makees dispersion compensation.Light wave plays a part of dispersion equilibrium after grating, so that
Realize dispersion compensation.The advantage of dispersion compensation chirped fiber grating is compact structure, it is easy to which incoming fiber optic leads to
Letter system.But there is also the defect that some urgent needs overcome, such as bandwidth is narrow, group delay is non-linear, volume
Outer insertion loss and needing solves the practical of manufacturing process, such as the repeatability of manufacturing process, encapsulation,
Temperature-compensating etc..
Develop most ripe technology at present and be mainly dispersion compensating fiber (DCF-Dispersion
Compensation Fiber) and chirped fiber grating (CFBG-Chirped Fiber Bragg Grating) dispersion benefit
Repay.Existing optical fiber dispersion compensation method and compensating device can also additionally increase in addition to it there is above-mentioned deficiency
Plus financial cost.Most importantly, transmitted for the optical fiber of extra long distance (>=2000km), using existing
Some fiber dispersion compensation techniques are difficult to the effective compensation to fibre-optical dispersion, when can not also meet high-precision
Between reference frequency signal extra long distance optical fiber transmit when, to reduce and eliminate dispersion and dispersion accumulation requirement.
The content of the invention
The technical problems to be solved by the invention are：For above-mentioned problem, there is provided a kind of inexpensive
Suitable for the Passively compensated method and link of the wavelength dispersion of extra long distance optical fiber transmission system.
The optical fiber link that the present invention is provided include the first communication point, the second communication point, n sections of same model optical fiber and
N+1 wavelength shifter；N is non-zero even number；
N roots fiber deployment passes through between the first communication point and the second communication point, and between two adjacent fibers
One wavelength shifter connection；
And the length of the 1st section of optical fiber and the equal length of the 2nd section of optical fiber, the 3rd section of fiber lengths and the
The equal length of 4 sections of optical fiber, by that analogy, (n-1)th section of fiber lengths are equal with n-th section of fiber lengths.
Further, it is single fiber bi-directional optic communication between the first communication point and the second communication point；
On optical signal up direction：First communication point is used for a length of λ 1 of send wave optical signal；1st section
The wavelength of optical signal transmitted on optical fiber is that the wavelength of optical signal transmitted on λ 1, the 2nd section of optical fiber is λ 2；3rd
The wavelength of optical signal transmitted on section optical fiber is that the wavelength of optical signal transmitted on λ 3, the 4th section of optical fiber is λ 4；With
This analogizes, and the wavelength of optical signal transmitted on (n-1)th section of optical fiber is the light letter transmitted on λ n-1, n-th section of optical fiber
Number wavelength is λ n；Second communication point is used for a length of λ n of received wave optical signal；
On optical signal down direction, the second communication point is used for a length of λ n-1 of send wave optical signal；N-th
The wavelength of optical signal transmitted on section optical fiber is that the wavelength of optical signal transmitted on λ n-1, (n-1)th section of optical fiber is λ n；
The wavelength of optical signal transmitted on the n-th -2 sections optical fiber is the wavelength of optical signal transmitted on λ n-3, the n-th -3 sections optical fiber
For λ n-2；By that analogy, the wavelength of optical signal transmitted on the 3rd section of optical fiber is λ 4, and the 4th section of optical fiber is uploaded
Defeated wavelength of optical signal is λ 3；The wavelength of optical signal transmitted on 1st section of optical fiber is on λ 2, the 2nd section of optical fiber
The wavelength of optical signal of transmission is λ 1；First communication point is used for a length of λ 2 of received wave optical signal；
Wherein, λ 1 and λ 2 dispersion complementary wavelength pair each other, λ 3 and λ 4 dispersion complementary wavelength pair, λ 5 each other
With the dispersion complementary wavelengths pair each other of λ 6, by that analogy, λ n-1 and λ n dispersion complementary wavelengths pair each other；Wavelength
The abbe number that the optical signal of dispersion complementary wavelength pair is transmitted in the same model optical fiber of certain length each other is big
Small of substantially equal, symbol is opposite.
Further, it is double-fiber bidirectional optical between the first communication point and the second communication point；
In optical signal uplink optical fibers：First communication point is used for a length of λ 1 of send wave optical signal；1st section
The wavelength of optical signal transmitted on optical fiber is that the wavelength of optical signal transmitted on λ 1, the 2nd section of optical fiber is λ 2；3rd
The wavelength of optical signal transmitted on section optical fiber is that the wavelength of optical signal transmitted on λ 3, the 4th section of optical fiber is λ 4；With
This analogizes, and the wavelength of optical signal transmitted on (n-1)th section of optical fiber is the light letter transmitted on λ n-1, n-th section of optical fiber
Number wavelength is λ n；Second communication point is used for a length of λ n of received wave optical signal；
In optical signal downlink optical fiber, the second communication point is used for a length of λ n-1 of send wave optical signal；N-th
The wavelength of optical signal transmitted on section optical fiber is that the wavelength of optical signal transmitted on λ n-1, (n-1)th section of optical fiber is λ n；
The wavelength of optical signal transmitted on the n-th -2 sections optical fiber is the wavelength of optical signal transmitted on λ n-3, the n-th -3 sections optical fiber
For λ n-2；By that analogy, the wavelength of optical signal transmitted on the 3rd section of optical fiber is λ 4, and the 4th section of optical fiber is uploaded
Defeated wavelength of optical signal is λ 3；The wavelength of optical signal transmitted on 1st section of optical fiber is on λ 2, the 2nd section of optical fiber
The wavelength of optical signal of transmission is λ 1；First communication point is used for a length of λ 2 of received wave optical signal；
Wherein, λ 1 and λ 2 dispersion complementary wavelength pair each other, λ 3 and λ 4 dispersion complementary wavelength pair, λ 5 each other
With the dispersion complementary wavelengths pair each other of λ 6, by that analogy, λ n-1 and λ n dispersion complementary wavelengths pair each other；Wavelength
The abbe number that the optical signal of dispersion complementary wavelength pair is transmitted in the same model optical fiber of certain length each other is big
Small of substantially equal, symbol is opposite.
Further, the wavelength shifter is used to receive the optical signal that one optical fiber is transmitted, and optical signal is turned
It is changed to the optical signal of another wavelength and by the optical signal transmission after Wavelength-converting to the wavelength shifter opposite side
Optical fiber on；
The wavelength shifter also receives the optical signal that another optical fiber is transmitted, and converts optical signals to another
The optical signal of one wavelength and by the optical signal transmission after Wavelength-converting a to optical fiber.
Further, the representative value of fiber lengths is 100km or 80km or 50km or 40km or 25km
Or 20km.
Further, when the slope difference of two abbe numbers on fibre-optical dispersion spectral characteristic curve is less than or waits
In [0.001ps/ (nm2.km), 0.005ps/ (nm2When .km)], it is believed that two abbe numbers are of substantially equal.
The dispersion compensation method that the static wavelength that the present invention is provided intersects includes two kinds.One of which is to be directed to two
The situation of single fiber bi-directional communication is carried out between individual communication point by optical fiber, following steps are specifically included：
N sections of isometric same model optical fiber are laid between two communication points, n is non-zero even number；
On optical signal up direction：The wavelength of optical signal transmitted on 1st section of optical fiber is λ 1, the 2nd section of optical fiber
The wavelength of optical signal of upper transmission is λ 2；The wavelength of optical signal transmitted on 3rd section of optical fiber is λ 3, the 4th section of light
The wavelength of optical signal transmitted on fibre is λ 4；By that analogy, the wavelength of optical signal transmitted on (n-1)th section of optical fiber is
The wavelength of optical signal transmitted on λ n-1, n-th section of optical fiber is λ n；
On optical signal down direction, the wavelength of optical signal transmitted on n-th section of optical fiber is λ n-1, (n-1)th section
The wavelength of optical signal transmitted on optical fiber is λ n；The wavelength of optical signal transmitted on the n-th -2 sections optical fiber is λ n-3, the
The wavelength of optical signal transmitted on n-3 sections of optical fiber is λ n-2；By that analogy, the light letter transmitted on the 3rd section of optical fiber
Number wavelength is that the wavelength of optical signal transmitted on λ 4, the 4th section of optical fiber is λ 3；The light transmitted on 1st section of optical fiber
Signal wavelength is that the wavelength of optical signal transmitted on λ 2, the 2nd section of optical fiber is λ 1；
Wherein, λ 1 and λ 2 dispersion complementary wavelength pair each other, λ 3 and λ 4 dispersion complementary wavelength pair, λ 5 each other
With the dispersion complementary wavelengths pair each other of λ 6, by that analogy, λ n-1 and λ n dispersion complementary wavelengths pair each other；Wavelength
The abbe number that the optical signal of dispersion complementary wavelength pair is transmitted in the same model optical fiber of certain length each other is big
Small of substantially equal, symbol is opposite.
Another is the situation for carrying out double-fiber two-way communication between two communication points by optical fiber, that is,
Say and up signal is only transmitted in an optical fiber, descending signal is only transmitted in another optical fiber.Specific bag
Include following steps：
N sections of isometric same model optical fiber are laid between two communication points, n is non-zero even number；
In optical signal uplink optical fibers：The wavelength of optical signal transmitted on 1st section of optical fiber is λ 1, the 2nd section of optical fiber
The wavelength of optical signal of upper transmission is λ 2；The wavelength of optical signal transmitted on 3rd section of optical fiber is λ 3, the 4th section of light
The wavelength of optical signal transmitted on fibre is λ 4；By that analogy, the wavelength of optical signal transmitted on (n-1)th section of optical fiber is
The wavelength of optical signal transmitted on λ n-1, n-th section of optical fiber is λ n；
In optical signal downlink optical fiber, the wavelength of optical signal transmitted on n-th section of optical fiber is λ n-1, (n-1)th section
The wavelength of optical signal transmitted on optical fiber is λ n；The wavelength of optical signal transmitted on the n-th -2 sections optical fiber is λ n-3, the
The wavelength of optical signal transmitted on n-3 sections of optical fiber is λ n-2；By that analogy, the light letter transmitted on the 3rd section of optical fiber
Number wavelength is that the wavelength of optical signal transmitted on λ 4, the 4th section of optical fiber is λ 3；The light transmitted on 1st section of optical fiber
Signal wavelength is that the wavelength of optical signal transmitted on λ 2, the 2nd section of optical fiber is λ 1；
Wherein, λ 1 and λ 2 dispersion complementary wavelength pair each other, λ 3 and λ 4 dispersion complementary wavelength pair, λ 5 each other
With the dispersion complementary wavelengths pair each other of λ 6, by that analogy, λ n-1 and λ n dispersion complementary wavelengths pair each other；Wavelength
The abbe number that the optical signal of dispersion complementary wavelength pair is transmitted in the same model optical fiber of certain length each other is big
Small of substantially equal, symbol is opposite.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
Using static wavelength crossed dispersion compensation method proposed by the present invention without using any dispersion compensator,
Cost is relatively low；Uplink optical signal propagation delay time and downlink optical signal propagation delay time in every section of optical fiber can be made basic
Offset, and the time delay of each section of optical fiber on up direction or down direction is also cancelled out each other, 2000km optical fiber
The asymmetric difference ≈ 0 of time delay of transmission, disclosure satisfy that ultra-long span transmission and high-speed, the optical fiber of Large Copacity
Transmission system, especially adapts to the transmission of split-second precision reference frequency signal.
Brief description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is model G.652 fibre-optical dispersion spectral characteristic curve map.
Fig. 2 is the dispersion spectral characteristic curve map of Multiple Type optical fiber.
Fig. 3 transmits 200km static wavelength crossed dispersion compensation method schematic diagram for optical fiber in the present invention.
Fig. 4 transmits 600km static wavelength crossed dispersion compensation method schematic diagram for optical fiber in the present invention.
Fig. 5 is the structure chart of the Passively compensated optical fiber link embodiment of wavelength dispersion of the present invention.
Embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutual
Beyond the feature and/or step mutually repelled, it can combine in any way.
Any feature disclosed in this specification, unless specifically stated otherwise, can be equivalent by other or with similar
The alternative features of purpose are replaced.I.e., unless specifically stated otherwise, each feature is a series of equivalent or class
Like an example in feature.
Need first to illustrate fibre-optical dispersion spectral characteristic before the principle of the invention is introduced.
Fig. 1 shows the fibre-optical dispersion spectral characteristic of model G.652.The cable network that China has built
95 ﹪ are G.652 optical fiber in network.
The reason for producing dispersion has a variety of, wherein mainly material dispersion and waveguide dispersion, total dispersion is a variety of
Cause the superposition of the factor of dispersion generation.It can be seen that wavelength for 1310nm light G.652
When being transmitted in optical fiber, total dispersion is 0, and 1310nm is referred to as the zero-dispersion wavelength λ 0 of G.652 optical fiber by we.
λ ＞ λ 0 region is anomalous dispersion region, and λ ＜ λ 0 region is normal-dispersion.
With of substantially equal offset to anomalous dispersion region, normal-dispersion centered on zero-dispersion wavelength
Search, can necessarily find a pair of wavelength Xs+, λ-, wavelength be λ+optical signal in the such light of certain length
Abbe number in fibre and wavelength be λ-abbe number size of the optical signal in same length this type optical fiber
Quite, symbol is on the contrary, such a pair of wavelength are referred to as dispersion complementary wavelength pair by us.When fibre-optical dispersion wave spectrum
The slope difference of two abbe numbers on characteristic curve is less than or equal to [0.001ps/ (nm2.km),
0.005ps/(nm2When .km)], it is believed that two abbe numbers are of substantially equal.
For G.652 optical fiber, λ +=λ 0+20nm=1330nm, λ -=λ 0-20nm=1290nm.It is unusual
Dispersion area abbe number D (λ+)=D (1330nm)=+ 2.005ps/ (nm.km)；Normal dispersion region abbe number
D (λ -)=D (1290nm)=- 2.004ps/ (nm.km).
Such wavelength is to being also present in its all band, such as G.652 optical fiber, S-band
The center nominal reference reference wavelength λ to1 of (1450nm~1530nm), or C-band (1530nm~
Center nominal reference reference wavelength λ to2 1560nm), or in L-band (1565nm~1624nm)
Heart nominal reference reference wavelength λ to3 etc..Dispersion complementary wavelength is to being symmetrical in the center nominal reference
Reference wavelength etc. time delay difference (i.e. both time delay difference ＜ 50ps/100km) light wave pair.This implementation
The dispersion complementary wavelength that example is selected is to being located in 800nm~1620nm wavelength bands.(λto1、
Its nominal reference wavelength of λ to2 ... λ ton centers is also known as precise time-time-interval pilot tone, is exclusively used in every
Monitored on-line in fact during optical fiber and locking and isostatic compensation control automatically)
As shown in figure 3, it is 100km's to be laid with two length between communication A points and the B points that communicate
G.652 optical fiber.Two optical fiber are connected by wavelength shifter C.Used between communication point A and communication point B
Single fiber bi-directional mode is communicated.Uplink optical signal is present in downlink optical signal by way of wavelength-division multiplex
In same optical fiber.Wavelength-division multiplex can be that CWDM (CWDM) or density wavelength-division are multiple
With (DWDM).
The a length of 1330nm of the A point send waves that communicate optical signal, wavelength shifter C is converted into 1290nm
Optical signal after send to communication B points.
While the optical signal for a length of 1330nm of B point send waves that communicates, wavelength shifter C is converted into
Sent after 1290nm optical signal to communication A points.
In order to illustrate that static wavelength crossed dispersion compensation method proposed by the present invention can realize that dispersion is supported automatically
Disappear, now calculated by parameter into line justification：
The anomalous dispersion region abbe number D (λ+)=D (1330nm)=+ 2.005ps/ (nm.km)；
Normal dispersion region abbe number D (λ -)=D (1290nm)=- 2.004ps/ (nm.km)；
Optical Fiber Transmission distance L=200km.
So
100km anomalous dispersions τ (λ+)=τ (1330nm)=D (λ+) × 100km=+200.5ps/nm (1)；
100Km normal dispersions τ (λ -)=τ (1290nm)=D (λ -) × 100km=-200.4ps/nm (2)；
τ (λ+)+τ (λ -)=+ 200.5ps/nm-200.4ps/nm=0.1ps/nm (3).
In 200km G.652 optical fiber, first transmitted using wavelength X=1330nm optical signal after 100km,
Again using wavelength X=1290nm optical signal transmission 100km, then the dispersion accumulation of 200km optical fiber transmission
For 0.1ps.It is considered that light path time delay difference is almost 0, (note：Dispersion of other light waves to signal is accumulated
It is likely larger than 0.1ps).If time delay difference is not present in light path, then accumulated it is considered that dispersion is also not present.
Therefore, the dispersion accumulation of two sections of 100km transmission line is approximately zero.
If length is transmitted for 600km optical fiber, then can be divided into 2 sections of 100km optical fiber and 2 sections
200km optical fiber, the optical signal that two pairs of dispersion compensation wavelength pair are respectively adopted intersects transmission, as shown in Figure 4.
In this embodiment, communicated between communication point A and communication point B by the way of double-fiber transmitted in both directions.
In signal uplink optical fiber, transmission wavelength λ 1 optical signal in the 1st section of 100km optical fiber, the 2nd section of 100km
Transmission wavelength is λ 2 optical signal in optical fiber, and transmission wavelength is the optical signals of λ 3 in the 3rd section of 200km optical fiber,
Transmission wavelength is the optical signals of λ 4 in 4th section of 200km optical fiber, it is achieved thereby that length on signal uplink direction
The automotive resistance of the dispersion accumulation of 600km optical fiber transmission.
In signal downlink optical fiber, transmission wavelength λ 2 optical signal, the 2nd section in the 1st section of 100km optical fiber
Transmission wavelength is λ 1 optical signal in 100km optical fiber, and transmission wavelength is λ 4 in the 3rd section of 200km optical fiber
Transmission wavelength is the optical signals of λ 3 in optical signal, the 4th section of 200km optical fiber, it is achieved thereby that signal downlink side
The automotive resistance of the dispersion accumulation of upward length 600km optical fiber transmission.
Wavelength X 1 and wavelength X 2 dispersion complementary wavelength pair each other, wavelength X 3 are complementary with the dispersion each other of wavelength X 4
Wavelength pair.So, you can realize the automotive resistance of dispersion accumulation, optical signal is in up direction and down direction
On delay inequality cancel out each other, the method that this dispersion is offset is referred to as the dispersion compensation side that static wavelength intersects
Method.
In other embodiments, the length of every section of optical fiber might not be set to 100km, be entered according to actual conditions
Row adjustment, but it is to ensure that the 1st section of optical fiber and the 2nd section of optical fiber are as isometric as possible, the 3rd section of optical fiber and the 4th
Section optical fiber is as isometric as possible, and by that analogy, (n-1)th section of optical fiber and n-th section of optical fiber are as isometric as possible.Optical fiber
Length can be set to arbitrary value, classical value is that 80km or 50km or 40km or 25km or 20km is equal
Can.
Fig. 5 is a specific optical fiber link of the dispersion compensation method intersected based on static wavelength：Including logical
Believe point A, communication point B, 6 sections of isometric same model optical fiber and 5 wavelength shifters.Communication point A and logical
Communicated between letter point B using the transmission means of single-fiber-optic two-way wavelength division multiplexing.
6 sections of fiber deployments pass through one between communication point A and communication point B, and between two adjacent fibers
Wavelength shifter is connected.
Wavelength shifter is used to receive the optical signal that one optical fiber is transmitted, and turns optical signal according to foregoing rule
It is changed to the optical signal of another wavelength and by the optical signal transmission after Wavelength-converting to the wavelength shifter opposite side
Optical fiber on.
The wavelength shifter also receives the optical signal that another optical fiber is transmitted, according to foregoing rule by light
Signal is converted to the optical signal of another wavelength and by the optical signal transmission after Wavelength-converting a to optical fiber
On.
In other embodiments, the quantity of optical fiber is not limited to 6 sections, and the quantity of wavelength shifter is also not necessarily limited to 5
Platform.It can be adjusted according to optical fiber total length, as long as disclosure satisfy that number of fibers is n sections, wavelength convert
Device quantity is n+1 platforms.
The present disclosure applies equally to the optical fiber of model G.653, G.655, referring to Fig. 2, optical fiber G.653 and
The dispersion spectral profile shape of optical fiber G.655 with it is G.652 similar, all in the presence of a zero-dispersion wavelength, and
The anomalous dispersion region and normal dispersion region.No matter that is, which kind of optical fiber whether single fiber bi-directional transmission or
Double-fiber upstream or downstream, can always find dispersion complementary wavelength pair.
The invention is not limited in foregoing embodiment.The present invention can expand to any in this explanation
The new feature disclosed in book or any new combination, and disclose any new method or process the step of or
Any new combination.
Claims (10)
1. a kind of static wavelength crossed dispersion compensation link, it is characterised in that including the first communication point,
Two communication points, n sections of same model optical fiber and n+1 wavelength shifter；N is non-zero even number；
N roots fiber deployment passes through between the first communication point and the second communication point, and between two adjacent fibers
One wavelength shifter connection；
And the length of the 1st section of optical fiber and the equal length of the 2nd section of optical fiber, the 3rd section of fiber lengths and the
The equal length of 4 sections of optical fiber, by that analogy, (n-1)th section of fiber lengths are equal with n-th section of fiber lengths.
2. a kind of static wavelength crossed dispersion compensation link according to claim 1, it is characterised in that
It is single fiber bi-directional optic communication between first communication point and the second communication point；
On optical signal up direction：First communication point is used for a length of λ 1 of send wave optical signal；1st section
The wavelength of optical signal transmitted on optical fiber is that the wavelength of optical signal transmitted on λ 1, the 2nd section of optical fiber is λ 2；3rd
The wavelength of optical signal transmitted on section optical fiber is that the wavelength of optical signal transmitted on λ 3, the 4th section of optical fiber is λ 4；With
This analogizes, and the wavelength of optical signal transmitted on (n-1)th section of optical fiber is the light letter transmitted on λ n-1, n-th section of optical fiber
Number wavelength is λ n；Second communication point is used for a length of λ n of received wave optical signal；
On optical signal down direction, the second communication point is used for a length of λ n-1 of send wave optical signal；N-th
The wavelength of optical signal transmitted on section optical fiber is that the wavelength of optical signal transmitted on λ n-1, (n-1)th section of optical fiber is λ n；
The wavelength of optical signal transmitted on the n-th -2 sections optical fiber is the wavelength of optical signal transmitted on λ n-3, the n-th -3 sections optical fiber
For λ n-2；By that analogy, the wavelength of optical signal transmitted on the 3rd section of optical fiber is λ 4, and the 4th section of optical fiber is uploaded
Defeated wavelength of optical signal is λ 3；The wavelength of optical signal transmitted on 1st section of optical fiber is on λ 2, the 2nd section of optical fiber
The wavelength of optical signal of transmission is λ 1；First communication point is used for a length of λ 2 of received wave optical signal；
Wherein, λ 1 and λ 2 dispersion complementary wavelength pair each other, λ 3 and λ 4 dispersion complementary wavelength pair, λ 5 each other
With the dispersion complementary wavelengths pair each other of λ 6, by that analogy, λ n-1 and λ n dispersion complementary wavelengths pair each other；Wavelength
The abbe number that the optical signal of dispersion complementary wavelength pair is transmitted in the same model optical fiber of certain length each other is big
Small of substantially equal, symbol is opposite.
3. a kind of static wavelength crossed dispersion compensation link according to claim 1, it is characterised in that
It is double-fiber bidirectional optical between first communication point and the second communication point；Every section of optical fiber includes the up light of optical signal
Fine and optical signal downlink optical fiber；
In optical signal uplink optical fibers：First communication point is used for a length of λ 1 of send wave optical signal；1st section
The wavelength of optical signal transmitted on optical fiber is that the wavelength of optical signal transmitted on λ 1, the 2nd section of optical fiber is λ 2；3rd
The wavelength of optical signal transmitted on section optical fiber is that the wavelength of optical signal transmitted on λ 3, the 4th section of optical fiber is λ 4；With
This analogizes, and the wavelength of optical signal transmitted on (n-1)th section of optical fiber is the light letter transmitted on λ n-1, n-th section of optical fiber
Number wavelength is λ n；Second communication point is used for a length of λ n of received wave optical signal；
In optical signal downlink optical fiber, the second communication point is used for a length of λ n-1 of send wave optical signal；N-th
The wavelength of optical signal transmitted on section optical fiber is that the wavelength of optical signal transmitted on λ n-1, (n-1)th section of optical fiber is λ n；
The wavelength of optical signal transmitted on the n-th -2 sections optical fiber is the wavelength of optical signal transmitted on λ n-3, the n-th -3 sections optical fiber
For λ n-2；By that analogy, the wavelength of optical signal transmitted on the 3rd section of optical fiber is λ 4, and the 4th section of optical fiber is uploaded
Defeated wavelength of optical signal is λ 3；The wavelength of optical signal transmitted on 1st section of optical fiber is on λ 2, the 2nd section of optical fiber
The wavelength of optical signal of transmission is λ 1；First communication point is used for a length of λ 2 of received wave optical signal；
Wherein, λ 1 and λ 2 dispersion complementary wavelength pair each other, λ 3 and λ 4 dispersion complementary wavelength pair, λ 5 each other
With the dispersion complementary wavelengths pair each other of λ 6, by that analogy, λ n-1 and λ n dispersion complementary wavelengths pair each other；Wavelength
The abbe number that the optical signal of dispersion complementary wavelength pair is transmitted in the same model optical fiber of certain length each other is big
Small of substantially equal, symbol is opposite.
4. a kind of static wavelength crossed dispersion compensation link according to Claims 2 or 3, its feature
It is, the wavelength shifter is used to receive the optical signal that one optical fiber is transmitted, converts optical signals to another
The optical signal of one wavelength and by the optical fiber of the optical signal transmission after Wavelength-converting to the wavelength shifter opposite side
On；
The wavelength shifter also receives the optical signal that another optical fiber is transmitted, and converts optical signals to another
The optical signal of one wavelength and by the optical signal transmission after Wavelength-converting a to optical fiber.
5. a kind of static wavelength crossed dispersion compensation link according to Claims 2 or 3, its feature
It is, fiber lengths are 100km or 80km or 50km or 40km or 25km or 20km.
6. a kind of static wavelength crossed dispersion compensation link according to Claims 2 or 3, its feature
It is, when the slope difference of two abbe numbers on fibre-optical dispersion spectral characteristic curve is less than or equal to
[0.001ps/(nm2.km), 0.005ps/ (nm2When .km)], it is believed that two abbe numbers are of substantially equal.
7. list is carried out by optical fiber between the dispersion compensation method that a kind of static wavelength intersects, two communication points
Fine two-way communication, it is characterised in that comprise the following steps：
N sections of isometric same model optical fiber are laid between two communication points, n is non-zero even number；
On optical signal up direction：The wavelength of optical signal transmitted on 1st section of optical fiber is λ 1, the 2nd section of optical fiber
The wavelength of optical signal of upper transmission is λ 2；The wavelength of optical signal transmitted on 3rd section of optical fiber is λ 3, the 4th section of light
The wavelength of optical signal transmitted on fibre is λ 4；By that analogy, the wavelength of optical signal transmitted on (n-1)th section of optical fiber is
The wavelength of optical signal transmitted on λ n-1, n-th section of optical fiber is λ n；
On optical signal down direction, the wavelength of optical signal transmitted on n-th section of optical fiber is λ n-1, (n-1)th section
The wavelength of optical signal transmitted on optical fiber is λ n；The wavelength of optical signal transmitted on the n-th -2 sections optical fiber is λ n-3, the
The wavelength of optical signal transmitted on n-3 sections of optical fiber is λ n-2；By that analogy, the light letter transmitted on the 3rd section of optical fiber
Number wavelength is that the wavelength of optical signal transmitted on λ 4, the 4th section of optical fiber is λ 3；The light transmitted on 1st section of optical fiber
Signal wavelength is that the wavelength of optical signal transmitted on λ 2, the 2nd section of optical fiber is λ 1；
Wherein, λ 1 and λ 2 dispersion complementary wavelength pair each other, λ 3 and λ 4 dispersion complementary wavelength pair, λ 5 each other
With the dispersion complementary wavelengths pair each other of λ 6, by that analogy, λ n-1 and λ n dispersion complementary wavelengths pair each other；Wavelength
The abbe number that the optical signal of dispersion complementary wavelength pair is transmitted in the same model optical fiber of certain length each other is big
Small of substantially equal, symbol is opposite.
8. the dispersion compensation method that a kind of static wavelength according to claim 1 intersects, its feature exists
In when the slope difference of two abbe numbers on fibre-optical dispersion spectral characteristic curve is less than or equal to
[0.001ps/(nm2.km), 0.005ps/ (nm2When .km)], it is believed that two abbe numbers are of substantially equal.
9. it is double by optical fiber progress between the dispersion compensation method that a kind of static wavelength intersects, two communication points
Fine two-way communication, it is characterised in that comprise the following steps：
N sections of isometric same model optical fiber are laid between two communication points, n is non-zero even number；
In optical signal uplink optical fibers：The wavelength of optical signal transmitted on 1st section of optical fiber is λ 1, the 2nd section of optical fiber
The wavelength of optical signal of upper transmission is λ 2；The wavelength of optical signal transmitted on 3rd section of optical fiber is λ 3, the 4th section of light
The wavelength of optical signal transmitted on fibre is λ 4；By that analogy, the wavelength of optical signal transmitted on (n-1)th section of optical fiber is
The wavelength of optical signal transmitted on λ n-1, n-th section of optical fiber is λ n；
In optical signal downlink optical fiber, the wavelength of optical signal transmitted on n-th section of optical fiber is λ n-1, (n-1)th section
The wavelength of optical signal transmitted on optical fiber is λ n；The wavelength of optical signal transmitted on the n-th -2 sections optical fiber is λ n-3, the
The wavelength of optical signal transmitted on n-3 sections of optical fiber is λ n-2；By that analogy, the light letter transmitted on the 3rd section of optical fiber
Number wavelength is that the wavelength of optical signal transmitted on λ 4, the 4th section of optical fiber is λ 3；The light transmitted on 1st section of optical fiber
Signal wavelength is that the wavelength of optical signal transmitted on λ 2, the 2nd section of optical fiber is λ 1；
Wherein, λ 1 and λ 2 dispersion complementary wavelength pair each other, λ 3 and λ 4 dispersion complementary wavelength pair, λ 5 each other
With the dispersion complementary wavelengths pair each other of λ 6, by that analogy, λ n-1 and λ n dispersion complementary wavelengths pair each other；Wavelength
The abbe number that the optical signal of dispersion complementary wavelength pair is transmitted in the same model optical fiber of certain length each other is big
Small of substantially equal, symbol is opposite.
10. the dispersion compensation method that a kind of static wavelength according to claim 9 intersects, its feature exists
In when the slope difference of two abbe numbers on fibre-optical dispersion spectral characteristic curve is less than or equal to
[0.001ps/(nm2.km), 0.005ps/ (nm2When .km)], it is believed that two abbe numbers are of substantially equal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108768506A (en) * | 2018-04-08 | 2018-11-06 | 四川泰富地面北斗科技股份有限公司 | A kind of polynary multifrequency common-view mode time service method based on common thresholding |
| CN114268367A (en) * | 2021-12-21 | 2022-04-01 | 国网甘肃省电力公司酒泉供电公司 | Multi-path power transmission method and system based on optical fiber combiner |
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| CN1743877A (en) * | 2004-09-02 | 2006-03-08 | 汪业衡 | Broadband high-speed optical fiber communication unit |
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| CN1447137A (en) * | 2002-03-22 | 2003-10-08 | 华为技术有限公司 | Optic fiber connection method utilized in long-distance transmission |
| CN1717885A (en) * | 2003-05-28 | 2006-01-04 | 日本电信电话株式会社 | Optical wavelength multiplex access system |
| CN1743877A (en) * | 2004-09-02 | 2006-03-08 | 汪业衡 | Broadband high-speed optical fiber communication unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108768506A (en) * | 2018-04-08 | 2018-11-06 | 四川泰富地面北斗科技股份有限公司 | A kind of polynary multifrequency common-view mode time service method based on common thresholding |
| CN108768506B (en) * | 2018-04-08 | 2021-06-01 | 四川泰富地面北斗科技股份有限公司 | Multi-element multi-frequency common-view comparison time service method based on common threshold |
| CN114268367A (en) * | 2021-12-21 | 2022-04-01 | 国网甘肃省电力公司酒泉供电公司 | Multi-path power transmission method and system based on optical fiber combiner |
| CN114268367B (en) * | 2021-12-21 | 2023-07-11 | 国网甘肃省电力公司酒泉供电公司 | Multipath power transmission method and system based on optical fiber combining |
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