CN105024758B - Realize the dense wavelength division multiplexing system and method for dispersion compensation - Google Patents
Realize the dense wavelength division multiplexing system and method for dispersion compensation Download PDFInfo
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Abstract
The invention discloses a kind of dense wavelength division multiplexing system and method for realizing dispersion compensation, it is related to optical communication field.The system includes the dispersion compensation unit being sequentially arranged, the first optical fibre collimator array, optical path-deflecting unit, the second optical fibre collimator array, optical fiber optical grating array, the array that dispersion compensation unit is made up of n chirp grating, n is more than 2, the array that first optical fibre collimator array is made up of n+1 optical fiber collimator, the array that second optical fibre collimator array is made up of n optical fiber collimator, the array that optical fiber optical grating array is made up of n fiber grating.Chirp grating in the dispersion compensation unit of the present invention can realize high speed DWDM dynamic dispersion compensation.Optical fiber optical grating array filters out the optical signal of corresponding wavelength, reflects the optical signal of other wavelength, and optical signal is reflected after the dispersion compensation functions of dispersion compensation unit, by that analogy, can realize that the dispersion compensation and partial wave of optical signal are filtered out.
Description
Technical field
The present invention relates to optical communication field, a kind of dense wavelength division multiplexing system for realizing dispersion compensation and side are specifically related to
Method.
Background technology
WDM (Wavelength Division Multiplexing, wavelength-division multiplex) is current most common photosphere networking
Technology, by the way that different wave length multiplexing is transmitted in an optical fiber, it is easy to realize Gbit/s even Tbit/s transmission capacity.
OXC (Optical Cross-Connect, light interleaves connection) equipment and ROADM (Reconfigurable Optical Add-
Drop Multiplexer, ROADM) as the core optical switching device in WDM networks, can be any
Port is configured to any wavelength.
Modern optical networks are divided into wide area network, Metropolitan Area Network (MAN) and access network, and wherein wide area network is totally interconnected structure, and node is used
OXC connections；Metropolitan Area Network (MAN) and access network are bidirectional optical fiber ring network structure, and multiplex/demultiplex is carried out using ROADM.
Nowadays the development trend of wavelength-division multiplex system is：Reuse wavelengths number is more and more, and channel spacing is less and less, Dan Xin
Road bit rate more and more higher, full optic relay distance is increasingly longer, the final dispersion for producing light.
The content of the invention
The invention aims to overcome the shortcomings of above-mentioned background technology, there is provided a kind of intensive ripple for realizing dispersion compensation
Division multiplexing system and method, can realize that the dispersion compensation and partial wave of optical signal are filtered out.
Present invention offer is a kind of to realize the dense wavelength division multiplexing system of dispersion compensation, including the dispersion compensation list being sequentially arranged
Member, the first optical fibre collimator array, optical path-deflecting unit, the second optical fibre collimator array, optical fiber optical grating array, dispersion compensation list
The array that member is made up of n chirp grating, n is the positive integer more than 2, and the first optical fibre collimator array is by n+1 optical fiber
The array of collimater composition, the array that the second optical fibre collimator array is made up of n optical fiber collimator, optical fiber optical grating array is
The array being made up of n fiber grating；
2nd~(n+1) individual optical fiber in 1~n chirp grating and the first optical fibre collimator array in dispersion compensation unit
Collimater is corresponded, and optical path-deflecting unit is provided with close to one end head clearance certain distance of the second optical fibre collimator array
Speculum, speculum is corresponding with the 1st optical fiber collimator in the first optical fibre collimator array, in the second optical fibre collimator array
The individual optical fiber collimators of the 2nd~(n+1) are corresponded in 1~n optical fiber collimator and the first optical fibre collimator array, fiber grating
The 1~n optical fiber collimator is corresponded in 1~n fiber grating and the second optical fibre collimator array in array.
On the basis of above-mentioned technical proposal, the light path trend in the system is：
N roads optical signal λ 1, λ 2 ... λ n are inputted from a port of the first optical fibre collimator array, pass through optical path-deflecting list
Member, is reflected by a reflector, and λ 1, λ 2 ... λ n are deflected through optical path-deflecting unit, sequentially pass through the second of the first optical fibre collimator array
Individual port, a port of dispersion compensation unit, λ 1, λ 2 ... λ n are after the dispersion compensation of dispersion compensation unit by all anti-
It is emitted back towards and, sequentially passes through second port of the first optical fibre collimator array, optical path-deflecting unit, the second optical fibre collimator array
A port, a port of optical fiber optical grating array, a port of optical fiber optical grating array only exports λ 1, by λ 2, λ
3 ... λ n are reflected；
λ 2, λ 3 ... λ n sequentially pass through a port of the second optical fibre collimator array, optical path-deflecting unit, inclined through light path
Turn unit deflection, sequentially pass through the 3rd port, second port of dispersion compensation unit, λ of the first optical fibre collimator array
2nd, λ n in λ 3 ... are all reflected after the dispersion compensation of dispersion compensation unit, sequentially pass through the first optical fibre collimator array
The 3rd port, optical path-deflecting unit, second port of the second optical fibre collimator array, second of optical fiber optical grating array
Port, second port of optical fiber optical grating array only exports λ 2, and λ 3, λ 4 ... λ n are reflected；
λ 3, λ 4 ... λ n sequentially pass through second port of the second optical fibre collimator array, optical path-deflecting unit, inclined through light path
Turn unit deflection, sequentially pass through the 4th port, the 3rd port, λ of dispersion compensation unit of the first optical fibre collimator array
3rd, λ n in λ 4 ... are all reflected after the dispersion compensation of dispersion compensation unit, sequentially pass through the first optical fibre collimator array
The 4th port, optical path-deflecting unit, the 3rd port of the second optical fibre collimator array, the 3rd of optical fiber optical grating array
Port, the 3rd port of optical fiber optical grating array only exports λ 3, and λ 4, λ 5 ... λ n are reflected；
……；
So repeatedly, optical fiber optical grating array filters out the optical signal of corresponding wavelength, reflects the optical signal of other wavelength, i.e. optical fiber
N-th of port of grating array only exports the λ n in optical signal, realizes filtering out respectively for n roads optical signal, and by speculum or
The optical signal that optical fiber optical grating array is reflected obtains dispersion compensation in dispersion compensation unit.
On the basis of above-mentioned technical proposal, the optical path-deflecting unit include the first displacement crystal, second displacement crystal,
Triple motion crystal, is disposed with the first half-wave plate, the first optical rotation plate, the second rotation between the first displacement crystal and second displacement crystal
Mating plate, the second half-wave plate, the first half-wave plate and the first optical rotation plate are positioned opposite, and the plane of incidence of the first half-wave plate and the first displacement are brilliant
Body phase pair, exit facet and the second displacement crystal phase pair of the first optical rotation plate；Second optical rotation plate and the second half-wave plate are positioned opposite, the
The plane of incidence of two optical rotation plates and the first displacement crystal phase pair, exit facet and the second displacement crystal phase pair of the second half-wave plate；
Be disposed between second displacement crystal and triple motion crystal the 3rd optical rotation plate, the 3rd half-wave plate, the 4th half-wave plate,
4th optical rotation plate, the 3rd optical rotation plate and the 3rd half-wave plate are positioned opposite, the plane of incidence and the second displacement crystal phase of the 3rd optical rotation plate
It is right, the exit facet and triple motion crystal phase pair of the 3rd half-wave plate；4th half-wave plate and the 4th optical rotation plate are positioned opposite, and the 4th half
The plane of incidence of wave plate and second displacement crystal phase pair, the exit facet and triple motion crystal phase pair of the 4th optical rotation plate.
On the basis of above-mentioned technical proposal, the exit facet of first half-wave plate is close to the plane of incidence of the first optical rotation plate
Or keep certain distance.
On the basis of above-mentioned technical proposal, the exit facet of second optical rotation plate be close to the second half-wave plate plane of incidence or
Keep certain distance.
On the basis of above-mentioned technical proposal, the exit facet of the 3rd optical rotation plate is close to the plane of incidence of the 3rd half-wave plate
Or keep certain distance.
On the basis of above-mentioned technical proposal, the exit facet of the 4th half-wave plate be close to the 4th optical rotation plate plane of incidence or
Keep certain distance.
The present invention also provides a kind of dense wave division multipurpose method for realizing dispersion compensation based on said system, including following
Step：
N roads optical signal λ 1, λ 2 ... λ n are inputted from a port of the first optical fibre collimator array, pass through optical path-deflecting list
Member, is reflected by a reflector, and λ 1, λ 2 ... λ n are deflected through optical path-deflecting unit, sequentially pass through the second of the first optical fibre collimator array
Individual port, a port of dispersion compensation unit, λ 1, λ 2 ... λ n are after the dispersion compensation of dispersion compensation unit by all anti-
It is emitted back towards and, sequentially passes through second port of the first optical fibre collimator array, optical path-deflecting unit, the second optical fibre collimator array
A port, a port of optical fiber optical grating array, a port of optical fiber optical grating array only exports λ 1, by λ 2, λ
3 ... λ n are reflected；
λ 2, λ 3 ... λ n sequentially pass through a port of the second optical fibre collimator array, optical path-deflecting unit, inclined through light path
Turn unit deflection, sequentially pass through the 3rd port, second port of dispersion compensation unit, λ of the first optical fibre collimator array
2nd, λ n in λ 3 ... are all reflected after the dispersion compensation of dispersion compensation unit, sequentially pass through the first optical fibre collimator array
The 3rd port, optical path-deflecting unit, second port of the second optical fibre collimator array, second of optical fiber optical grating array
Port, second port of optical fiber optical grating array only exports λ 2, and λ 3, λ 4 ... λ n are reflected；
λ 3, λ 4 ... λ n sequentially pass through second port of the second optical fibre collimator array, optical path-deflecting unit, inclined through light path
Turn unit deflection, sequentially pass through the 4th port, the 3rd port, λ of dispersion compensation unit of the first optical fibre collimator array
3rd, λ n in λ 4 ... are all reflected after the dispersion compensation of dispersion compensation unit, sequentially pass through the first optical fibre collimator array
The 4th port, optical path-deflecting unit, the 3rd port of the second optical fibre collimator array, the 3rd of optical fiber optical grating array
Port, the 3rd port of optical fiber optical grating array only exports λ 3, and λ 4, λ 5 ... λ n are reflected；
……；
So repeatedly, optical fiber optical grating array filters out the optical signal of corresponding wavelength, reflects the optical signal of other wavelength, i.e. optical fiber
N-th of port of grating array only exports the λ n in optical signal, realizes filtering out respectively for n roads optical signal, and by speculum or
The optical signal that optical fiber optical grating array is reflected obtains dispersion compensation in dispersion compensation unit.
On the basis of above-mentioned technical proposal, the optical path-deflecting unit include the first displacement crystal, second displacement crystal,
Triple motion crystal, is disposed with the first half-wave plate, the first optical rotation plate, the second rotation between the first displacement crystal and second displacement crystal
Mating plate, the second half-wave plate, the first half-wave plate and the first optical rotation plate are positioned opposite, and the plane of incidence of the first half-wave plate and the first displacement are brilliant
Body phase pair, exit facet and the second displacement crystal phase pair of the first optical rotation plate；Second optical rotation plate and the second half-wave plate are positioned opposite, the
The plane of incidence of two optical rotation plates and the first displacement crystal phase pair, exit facet and the second displacement crystal phase pair of the second half-wave plate；
Be disposed between second displacement crystal and triple motion crystal the 3rd optical rotation plate, the 3rd half-wave plate, the 4th half-wave plate,
4th optical rotation plate, the 3rd optical rotation plate and the 3rd half-wave plate are positioned opposite, the plane of incidence and the second displacement crystal phase of the 3rd optical rotation plate
It is right, the exit facet and triple motion crystal phase pair of the 3rd half-wave plate；4th half-wave plate and the 4th optical rotation plate are positioned opposite, and the 4th half
The plane of incidence of wave plate and second displacement crystal phase pair, the exit facet and triple motion crystal phase pair of the 4th optical rotation plate；
Light path from second port to a port of optical fiber optical grating array of the first optical fibre collimator array is specific
It is as follows：
The light that second port of the first optical fibre collimator array is inputted is separated into mutually orthogonal by the first displacement crystal
Two-beam：Ordinary light o light and non-ordinary light e light, the o light isolated sequentially pass through the first half-wave plate, the first optical rotation plate, obtain o light；
The e light isolated sequentially passes through the second optical rotation plate, the second half-wave plate, obtains o light；The mutually orthogonal two-beam isolated
Light vector is adjusted to equidirectional：All it is o light；
Two beam o light levels inject second displacement crystal, and a branch of o light sequentially passes through the 3rd optical rotation plate, the 3rd half-wave plate, obtained
O light；Another beam o light sequentially passes through the 4th half-wave plate, the 4th optical rotation plate, obtains e light；The light vector of two beam o light is adjusted to phase
Mutual orthogonal direction：A branch of o light, a branch of e light；
A branch of o light, a branch of e light are injected after triple motion crystal, are combined into a branch of output light by triple motion crystal, are output to
The a port of second optical fibre collimator array；
The a port of optical fiber optical grating array filters out the optical signal of corresponding wavelength, reflects the optical signal of other wavelength.
On the basis of above-mentioned technical proposal, a port of the optical fiber optical grating array to the first optical fiber collimator battle array
The light path of 3rd port of row is specific as follows：
Held by the optical signal that a port of optical fiber optical grating array reflects from first of the second optical fibre collimator array
The light beam of input is separated into mutually orthogonal two-beam by mouth input triple motion crystal, triple motion crystal：O light and e light, point
The o light separated out sequentially passes through the 3rd half-wave plate, the 3rd optical rotation plate, obtains e light；The e light isolated sequentially pass through the 4th optical rotation plate,
4th half-wave plate, obtains e light；The light vector for the mutually orthogonal two-beam isolated is adjusted to equidirectional：All it is e
Light；
Two beam e parallel lights inject second displacement crystal, the deflected refraction of light path, a branch of e light sequentially pass through the first optical rotation plate,
First half-wave plate, obtains o light；Another beam e light sequentially passes through the second half-wave plate, the second optical rotation plate, obtains e light；The light of two beam e light
Vector is adjusted to mutually orthogonal direction：A branch of o light, a branch of e light；
A branch of o light, a branch of e light are injected after the first displacement crystal, are combined into a branch of output light by the first displacement crystal, are output to
3rd port of the first optical fibre collimator array.
Compared with prior art, advantages of the present invention is as follows：
Chirp grating in the dispersion compensation unit of the present invention can realize high speed DWDM (Dense Wavelength
Division Multiplexing, dense wave division multipurpose) dynamic dispersion compensation.Optical fiber optical grating array filters out corresponding wavelength
Optical signal, reflects the optical signal of other wavelength, optical signal is reflected after the dispersion compensation functions of dispersion compensation unit, with this
Analogize, can realize that the dispersion compensation and partial wave of optical signal are filtered out.
Brief description of the drawings
Fig. 1 is the structural representation for the dense wavelength division multiplexing system that dispersion compensation is realized in the embodiment of the present invention.
Fig. 2 is the light path schematic diagram that optical signal is transferred to the second optical fibre collimator array from the first optical fibre collimator array.
Fig. 3 is the light path schematic diagram that optical signal is transferred to the first optical fibre collimator array from the second optical fibre collimator array.
Fig. 4 is the dispersion compensation schematic diagram of chirp grating.
Reference：1- dispersion compensation units, the optical fibre collimator arrays of 2- first, 3- optical path-deflecting units, the light of 4- second
Fine collimator array, 5- optical fiber optical grating arrays, 6- speculums, 3a- the first displacement crystal, the half-wave plates of 3b- first, 3c- first revolves
Mating plate, the optical rotation plates of 3d- second, the half-wave plates of 3e- second, 3f- second displacement crystal, the optical rotation plates of 3g- the 3rd, the half-wave plates of 3h- the 3rd,
The half-wave plates of 3i- the 4th, the optical rotation plates of 3j- the 4th, 3k- triple motion crystal.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of dense wavelength division multiplexing system for realizing dispersion compensation, including suitable
The dispersion compensation unit 1 of secondary arrangement, the first optical fibre collimator array 2, optical path-deflecting unit 3, the second optical fibre collimator array 4,
Optical fiber optical grating array 5, the array that dispersion compensation unit 1 is made up of n chirp grating, n is the positive integer more than 2, the first light
The array that fine collimator array 2 is made up of n+1 optical fiber collimator, the second optical fibre collimator array 4 is by n fiber optic collimator
The 1~n Zhou in the array of device composition, the array that optical fiber optical grating array 5 is made up of n fiber grating, dispersion compensation unit 1
The individual optical fiber collimators of the 2nd~(n+1) in grating and the first optical fibre collimator array 2 of singing are corresponded, and optical path-deflecting unit 3 is close
One end head clearance certain distance of second optical fibre collimator array 4 is provided with speculum 6, the fiber optic collimator of speculum 6 and first
The 1st optical fiber collimator is corresponding in device array 2,1~n optical fiber collimator and the first light in the second optical fibre collimator array 4
The individual optical fiber collimators of the 2nd~(n+1) are corresponded in fine collimator array 2, the 1~n fiber grating in optical fiber optical grating array 5
Corresponded with the 1~n optical fiber collimator in the second optical fibre collimator array 4.
The embodiment of the present invention also provides a kind of dense wave division multipurpose method for realizing dispersion compensation based on said system, bag
Include following steps：
Shown in Figure 1, the light path trend in said system is：
N roads optical signal λ 1, λ 2 ... λ n are inputted from a port of the first optical fibre collimator array 2, pass through optical path-deflecting
Unit 3, is reflected by speculum 6, and λ 1, λ 2 ... λ n are deflected through optical path-deflecting unit 3, sequentially passes through the first optical fibre collimator array 2
Second port, a port of dispersion compensation unit 1, after the dispersion compensation of λ 1, λ 2 ... λ n by dispersion compensation unit 1
All reflected, sequentially pass through second port of the first optical fibre collimator array 2, optical path-deflecting unit 3, the second optical fiber
A port, a port of optical fiber optical grating array 5 of collimator array 4, a port of optical fiber optical grating array 5 is only
λ 1 is exported, λ 2, λ 3 ... λ n are reflected；
λ 2, λ 3 ... λ n sequentially pass through a port of the second optical fibre collimator array 4, optical path-deflecting unit 3, through light path
Deflection unit 3 is deflected, and sequentially passes through the 3rd port, second end of dispersion compensation unit 1 of the first optical fibre collimator array 2
Mouthful, λ 2, λ 3 ... λ n are all reflected after the dispersion compensation by dispersion compensation unit 1, sequentially pass through the first fiber optic collimator
3rd port of device array 2, optical path-deflecting unit 3, second port of the second optical fibre collimator array 4, fiber grating battle array
Second port of row 5, second port of optical fiber optical grating array 5 only exports λ 2, and λ 3, λ 4 ... λ n are reflected；
λ 3, λ 4 ... λ n sequentially pass through second port of the second optical fibre collimator array 4, optical path-deflecting unit 3, through light path
Deflection unit 3 is deflected, and sequentially passes through the 4th port, the 3rd end of dispersion compensation unit 1 of the first optical fibre collimator array 2
Mouthful, λ 3, λ 4 ... λ n are all reflected after the dispersion compensation by dispersion compensation unit 1, sequentially pass through the first fiber optic collimator
4th port of device array 2, optical path-deflecting unit 3, the 3rd port of the second optical fibre collimator array 4, fiber grating battle array
3rd port of row 5, the 3rd port of optical fiber optical grating array 5 only exports λ 3, and λ 4, λ 5 ... λ n are reflected；
……；
So repeatedly, optical fiber optical grating array 5 filters out the optical signal of corresponding wavelength, reflects the optical signal of other wavelength, i.e. light
N-th of port of fine grating array 5 only exports the λ n in optical signal, realizes filtering out respectively for n roads optical signal, and by speculum
6 or the optical signal that reflects of optical fiber optical grating array 5 obtain dispersion compensation in dispersion compensation unit 1.
Shown in Figure 2, it is brilliant that optical path-deflecting unit 3 includes the first displacement crystal 3a, second displacement crystal 3f, triple motion
Body 3k, is disposed with the first half-wave plate 3b, the first optical rotation plate 3c, the second rotation between the first displacement crystal 3a and second displacement crystal 3f
Mating plate 3d, the second half-wave plate 3e, the first half-wave plate 3b and the first optical rotation plate 3c are positioned opposite, the first half-wave plate 3b plane of incidence with
First displacement crystal 3a is relative, and the first optical rotation plate 3c exit facet is relative with second displacement crystal 3f, and the first half-wave plate 3b's goes out
Penetrating face can be close to the first optical rotation plate 3c plane of incidence or keep certain distance, in actual manufacturing process, in order to which structure is tight
Gather, generally the two is close together；Second optical rotation plate 3d and the second half-wave plate 3e are positioned opposite, the second optical rotation plate 3d plane of incidence
Relative with the first displacement crystal 3a, the second half-wave plate 3e exit facet is relative with second displacement crystal 3f, the second optical rotation plate 3d's
Exit facet can be close to the second half-wave plate 3e planes of incidence or keep certain distance, in actual manufacturing process, in order to which structure is tight
Gather, generally the two is close together.
The 3rd optical rotation plate 3g, the 3rd half-wave plate 3h, are disposed between second displacement crystal 3f and triple motion crystal 3k
Four half-wave plate 3i, the 4th optical rotation plate 3j, the 3rd optical rotation plate 3g and the 3rd half-wave plate 3h are positioned opposite, the 3rd optical rotation plate 3g incidence
Face is relative with second displacement crystal 3f, and the 3rd half-wave plate 3h exit facet is relative with triple motion crystal 3k, the 3rd optical rotation plate 3g
Exit facet can be close to the 3rd half-wave plate 3h plane of incidence or keep certain distance, in actual manufacturing process, to finish
Structure is compact, and generally the two is close together；4th half-wave plate 3i and the 4th optical rotation plate 3j are positioned opposite, and the 4th half-wave plate 3i's enters
Penetrate face relative with second displacement crystal 3f, the 4th optical rotation plate 3j exit facet is relative with triple motion crystal 3k, the 4th half-wave plate
3i exit facet can be close to the 4th optical rotation plate 3j planes of incidence or keep certain distance, in actual manufacturing process, to finish
Structure is compact, and generally the two is close together.
It is shown in Figure 2, second port to first end of optical fiber optical grating array 5 of the first optical fibre collimator array 2
The light path of mouth is specific as follows：
The light that second port of the first optical fibre collimator array 2 is inputted is separated into mutually orthogonal by the first displacement crystal 3a
Two-beam：O light (ordinarylight ray, ordinary light) and e light (extraordinary ray, non-ordinary light), are isolated
O light sequentially pass through the first half-wave plate 3b, the first optical rotation plate 3c, obtain o light；The e light isolated sequentially passes through the second optical rotation plate
3d, the second half-wave plate 3e, obtain o light；The light vector for the mutually orthogonal two-beam isolated is adjusted to equidirectional：All
For o light；
Two beam o light levels inject second displacement crystal 3f, and a branch of o light sequentially passes through the 3rd optical rotation plate 3g, the 3rd half-wave plate
3h, obtains o light；Another beam o light sequentially passes through the 4th half-wave plate 3i, the 4th optical rotation plate 3j, obtains e light；The light vector of two beam o light
It is adjusted to mutually orthogonal direction：A branch of o light, a branch of e light；
A branch of o light, a branch of e light are injected after triple motion crystal 3k, and a branch of output light is combined into by triple motion crystal 3k, defeated
Go out a port to the second optical fibre collimator array 4.
Optical fiber optical grating array 5 filters out the optical signal of corresponding wavelength, reflects the optical signal of other wavelength.
Shown in Figure 3, a port of optical fiber optical grating array 5 is held to the 3rd of the first optical fibre collimator array 2
The light path of mouth is specific as follows：
The optical signal reflected by a port of optical fiber optical grating array 5 is from first of the second optical fibre collimator array 4
The light beam of input is separated into mutually orthogonal two-beam by input triple motion crystal 3k, triple motion crystal 3k for port：O light with
E light, the o light isolated sequentially passes through the 3rd half-wave plate 3h, the 3rd optical rotation plate 3g, obtains e light；The e light isolated is sequentially passed through
4th optical rotation plate 3j, the 4th half-wave plate 3i, obtain e light；The light vector for the mutually orthogonal two-beam isolated is adjusted to
Equidirectional：All it is e light；
Two beam e parallel lights inject second displacement crystal 3f, and the deflected refraction of light path, a branch of e light sequentially passes through the first optically-active
Piece 3c, the first half-wave plate 3b, obtain o light；Another beam e light sequentially passes through the second half-wave plate 3e, the second optical rotation plate 3d, obtains e light；
The light vector of two beam e light is adjusted to mutually orthogonal direction：A branch of o light, a branch of e light；
A branch of o light, a branch of e light are injected after the first displacement crystal 3a, and a branch of output light is combined into by the first displacement crystal 3a, defeated
Go out the 3rd port to the first optical fibre collimator array 2.
Optical signal is reflected after the dispersion compensation functions by dispersion compensation unit 1, by that analogy, can realize optical signal
Dispersion compensation and partial wave filter out.
Chirp grating in dispersion compensation unit can realize high speed DWDM (Dense Wavelength Division
Multiplexing, dense wave division multipurpose) dynamic dispersion compensation.Temperature tuning type chirp grating under the influence of ambient temperature,
The local reflex wavelength response of chirp grating can change with the change of local temperature.In addition chirped fiber can also be by optical fiber
Effects of strain influences, therefore realizes chirp grating dynamic tuning function to strain and the response characteristic of temperature using optical fiber.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these modifications and change
Type is within the scope of the claims in the present invention and its equivalent technologies, then these modifications and variations are also in protection scope of the present invention
Within.
The prior art that the content not being described in detail in specification is known to the skilled person.
Claims (10)
1. a kind of dense wavelength division multiplexing system for realizing dispersion compensation, it is characterised in that：Including the dispersion compensation list being sequentially arranged
First (1), the first optical fibre collimator array (2), optical path-deflecting unit (3), the second optical fibre collimator array (4), fiber grating battle array
Arrange (5), the array that dispersion compensation unit (1) is made up of n chirp grating, n is the positive integer more than 2, the first fiber optic collimator
The array that device array (2) is made up of n+1 optical fiber collimator, the second optical fibre collimator array (4) is by n optical fiber collimator
The array of composition, the array that optical fiber optical grating array (5) is made up of n fiber grating；
2nd~(n+1) individual light in 1~n chirp grating and the first optical fibre collimator array (2) in dispersion compensation unit (1)
Fine collimater is corresponded, one end head clearance one spacing of the optical path-deflecting unit (3) close to the second optical fibre collimator array (4)
From speculum (6) is provided with, speculum (6) is corresponding with the 1st optical fiber collimator in the first optical fibre collimator array (2), and second
2nd~(n+1) individual light in 1~n optical fiber collimator and the first optical fibre collimator array (2) in optical fibre collimator array (4)
Fine collimater is corresponded, in optical fiber optical grating array (5) the in 1~n fiber grating and the second optical fibre collimator array (4)
1~n optical fiber collimator is corresponded.
2. the dense wavelength division multiplexing system as claimed in claim 1 for realizing dispersion compensation, it is characterised in that：In the system
Light path is moved towards：
N roads optical signal λ 1, λ 2 ... λ n are inputted from a port of the first optical fibre collimator array (2), pass through optical path-deflecting list
First (3), are reflected by speculum (6), and λ 1, λ 2 ... λ n are deflected through optical path-deflecting unit (3), sequentially pass through the first optical fiber collimator battle array
Second port, a port of dispersion compensation unit (1) of (2) are arranged, λ 1, λ 2 ... λ n are by dispersion compensation unit (1)
All reflected after dispersion compensation, sequentially pass through second port, the optical path-deflecting list of the first optical fibre collimator array (2)
First (3), a port of the second optical fibre collimator array (4), a port of optical fiber optical grating array (5), fiber grating
The a port of array (5) only exports λ 1, and λ 2, λ 3 ... λ n are reflected；
λ 2, λ 3 ... λ n sequentially pass through a port of the second optical fibre collimator array (4), optical path-deflecting unit (3), through light path
Deflection unit (3) is deflected, and sequentially passes through the 3rd port of the first optical fibre collimator array (2), the of dispersion compensation unit (1)
Two ports, λ 2, λ 3 ... λ n are all reflected after the dispersion compensation of dispersion compensation unit (1), sequentially pass through first
The 3rd port, optical path-deflecting unit (3), second end of the second optical fibre collimator array (4) of optical fibre collimator array (2)
Mouth, second port of optical fiber optical grating array (5), second port of optical fiber optical grating array (5) only exports λ 2, by λ 3, λ 4 ... λ
N is reflected；
λ 3, λ 4 ... λ n sequentially pass through second port of the second optical fibre collimator array (4), optical path-deflecting unit (3), through light path
Deflection unit (3) is deflected, and sequentially passes through the 4th port of the first optical fibre collimator array (2), the of dispersion compensation unit (1)
Three ports, λ 3, λ 4 ... λ n are all reflected after the dispersion compensation of dispersion compensation unit (1), sequentially pass through first
The 4th port, optical path-deflecting unit (3), the 3rd end of the second optical fibre collimator array (4) of optical fibre collimator array (2)
Mouth, the 3rd port of optical fiber optical grating array (5), the 3rd port of optical fiber optical grating array (5) only exports λ 3, by λ 4, λ 5 ... λ
N is reflected；
So repeatedly, optical fiber optical grating array (5) filters out the optical signal of corresponding wavelength, reflects the optical signal of other wavelength, i.e. optical fiber
N-th of port of grating array (5) only exports the λ n in optical signal, realizes filtering out respectively for n roads optical signal, and by speculum
Or the optical signal that reflects of optical fiber optical grating array (5) obtains dispersion compensation in dispersion compensation unit (1) (6).
3. the dense wavelength division multiplexing system as claimed in claim 1 for realizing dispersion compensation, it is characterised in that：The optical path-deflecting
Unit (3) includes the first displacement crystal (3a), second displacement crystal (3f), triple motion crystal (3k), the first displacement crystal
Be disposed between (3a) and second displacement crystal (3f) the first half-wave plate (3b), the first optical rotation plate (3c), the second optical rotation plate (3d),
Second half-wave plate (3e), the first half-wave plate (3b) and the first optical rotation plate (3c) are positioned opposite, the plane of incidence of the first half-wave plate (3b)
With the first displacement crystal (3a) relatively, the exit facet of the first optical rotation plate (3c) is relative with second displacement crystal (3f)；Second optically-active
Piece (3d) and the second half-wave plate (3e) are positioned opposite, the plane of incidence of the second optical rotation plate (3d) and the first displacement crystal (3a) relatively,
The exit facet of second half-wave plate (3e) is relative with second displacement crystal (3f)；
The 3rd optical rotation plate (3g), the 3rd half-wave plate are disposed between second displacement crystal (3f) and triple motion crystal (3k)
(3h), the 4th half-wave plate (3i), the 4th optical rotation plate (3j), the 3rd optical rotation plate (3g) and the 3rd half-wave plate (3h) are positioned opposite, the
With second displacement crystal (3f) relatively, the exit facet and triple motion of the 3rd half-wave plate (3h) are brilliant for the plane of incidence of three optical rotation plates (3g)
Body (3k) is relative；4th half-wave plate (3i) and the 4th optical rotation plate (3j) are positioned opposite, the plane of incidence of the 4th half-wave plate (3i) and
Relatively, the exit facet and triple motion crystal (3k) of the 4th optical rotation plate (3j) are relative for two displacement crystal (3f).
4. the dense wavelength division multiplexing system as claimed in claim 3 for realizing dispersion compensation, it is characterised in that：First half-wave
The exit facet of piece (3b) is close to the plane of incidence of the first optical rotation plate (3c) or keeps certain distance.
5. the dense wavelength division multiplexing system as claimed in claim 3 for realizing dispersion compensation, it is characterised in that：Second optically-active
The exit facet of piece (3d) is close to the second half-wave plate (3e) plane of incidence or keeps certain distance.
6. the dense wavelength division multiplexing system as claimed in claim 3 for realizing dispersion compensation, it is characterised in that：3rd optically-active
The exit facet of piece (3g) is close to the plane of incidence of the 3rd half-wave plate (3h) or keeps certain distance.
7. the dense wavelength division multiplexing system as claimed in claim 3 for realizing dispersion compensation, it is characterised in that：4th half-wave
The exit facet of piece (3i) is close to the 4th optical rotation plate (3j) plane of incidence or keeps certain distance.
8. a kind of dense wave division multipurpose method for realizing dispersion compensation based on system described in claim 1, it is characterised in that bag
Include following steps：
N roads optical signal λ 1, λ 2 ... λ n are inputted from a port of the first optical fibre collimator array (2), pass through optical path-deflecting list
First (3), are reflected by speculum (6), and λ 1, λ 2 ... λ n are deflected through optical path-deflecting unit (3), sequentially pass through the first optical fiber collimator battle array
Second port, a port of dispersion compensation unit (1) of (2) are arranged, λ 1, λ 2 ... λ n are by dispersion compensation unit (1)
All reflected after dispersion compensation, sequentially pass through second port, the optical path-deflecting list of the first optical fibre collimator array (2)
First (3), a port of the second optical fibre collimator array (4), a port of optical fiber optical grating array (5), fiber grating
The a port of array (5) only exports λ 1, and λ 2, λ 3 ... λ n are reflected；
λ 2, λ 3 ... λ n sequentially pass through a port of the second optical fibre collimator array (4), optical path-deflecting unit (3), through light path
Deflection unit (3) is deflected, and sequentially passes through the 3rd port of the first optical fibre collimator array (2), the of dispersion compensation unit (1)
Two ports, λ 2, λ 3 ... λ n are all reflected after the dispersion compensation of dispersion compensation unit (1), sequentially pass through first
The 3rd port, optical path-deflecting unit (3), second end of the second optical fibre collimator array (4) of optical fibre collimator array (2)
Mouth, second port of optical fiber optical grating array (5), second port of optical fiber optical grating array (5) only exports λ 2, by λ 3, λ 4 ... λ
N is reflected；
λ 3, λ 4 ... λ n sequentially pass through second port of the second optical fibre collimator array (4), optical path-deflecting unit (3), through light path
Deflection unit (3) is deflected, and sequentially passes through the 4th port of the first optical fibre collimator array (2), the of dispersion compensation unit (1)
Three ports, λ 3, λ 4 ... λ n are all reflected after the dispersion compensation of dispersion compensation unit (1), sequentially pass through first
The 4th port, optical path-deflecting unit (3), the 3rd end of the second optical fibre collimator array (4) of optical fibre collimator array (2)
Mouth, the 3rd port of optical fiber optical grating array (5), the 3rd port of optical fiber optical grating array (5) only exports λ 3, by λ 4, λ 5 ... λ
N is reflected；
So repeatedly, optical fiber optical grating array (5) filters out the optical signal of corresponding wavelength, reflects the optical signal of other wavelength, i.e. optical fiber
N-th of port of grating array (5) only exports the λ n in optical signal, realizes filtering out respectively for n roads optical signal, and by speculum
Or the optical signal that reflects of optical fiber optical grating array (5) obtains dispersion compensation in dispersion compensation unit (1) (6).
9. the dense wave division multipurpose method as claimed in claim 8 for realizing dispersion compensation, it is characterised in that：The optical path-deflecting
Unit (3) includes the first displacement crystal (3a), second displacement crystal (3f), triple motion crystal (3k), the first displacement crystal
Be disposed between (3a) and second displacement crystal (3f) the first half-wave plate (3b), the first optical rotation plate (3c), the second optical rotation plate (3d),
Second half-wave plate (3e), the first half-wave plate (3b) and the first optical rotation plate (3c) are positioned opposite, the plane of incidence of the first half-wave plate (3b)
With the first displacement crystal (3a) relatively, the exit facet of the first optical rotation plate (3c) is relative with second displacement crystal (3f)；Second optically-active
Piece (3d) and the second half-wave plate (3e) are positioned opposite, the plane of incidence of the second optical rotation plate (3d) and the first displacement crystal (3a) relatively,
The exit facet of second half-wave plate (3e) is relative with second displacement crystal (3f)；
The 3rd optical rotation plate (3g), the 3rd half-wave plate are disposed between second displacement crystal (3f) and triple motion crystal (3k)
(3h), the 4th half-wave plate (3i), the 4th optical rotation plate (3j), the 3rd optical rotation plate (3g) and the 3rd half-wave plate (3h) are positioned opposite, the
With second displacement crystal (3f) relatively, the exit facet and triple motion of the 3rd half-wave plate (3h) are brilliant for the plane of incidence of three optical rotation plates (3g)
Body (3k) is relative；4th half-wave plate (3i) and the 4th optical rotation plate (3j) are positioned opposite, the plane of incidence of the 4th half-wave plate (3i) and
Relatively, the exit facet and triple motion crystal (3k) of the 4th optical rotation plate (3j) are relative for two displacement crystal (3f)；
Have from the light path of a port of second port of the first optical fibre collimator array (2) to optical fiber optical grating array (5)
Body is as follows：
The light that second port of the first optical fibre collimator array (2) is inputted is separated into mutually orthogonal by the first displacement crystal (3a)
Two-beam：Ordinary light o light and non-ordinary light e light, the o light isolated sequentially pass through the first half-wave plate (3b), the first optical rotation plate
(3c), obtains o light；The e light isolated sequentially passes through the second optical rotation plate (3d), the second half-wave plate (3e), obtains o light；Separate
The light vector of the mutually orthogonal two-beam gone out is adjusted to equidirectional：All it is o light；
Two beam o light levels inject second displacement crystal (3f), and a branch of o light sequentially passes through the 3rd optical rotation plate (3g), the 3rd half-wave plate
(3h), obtains o light；Another beam o light sequentially passes through the 4th half-wave plate (3i), the 4th optical rotation plate (3j), obtains e light；Two beam o light
Light vector is adjusted to mutually orthogonal direction：A branch of o light, a branch of e light；
A branch of o light, a branch of e light are injected after triple motion crystal (3k), and a branch of output light is combined into by triple motion crystal (3k), defeated
Go out a port to the second optical fibre collimator array (4)；
The a port of optical fiber optical grating array (5) filters out the optical signal of corresponding wavelength, reflects the optical signal of other wavelength.
10. the dense wave division multipurpose method as claimed in claim 9 for realizing dispersion compensation, it is characterised in that：The optical fiber light
The light path of a port of grid array (5) to the 3rd port of the first optical fibre collimator array (2) is specific as follows：
The optical signal reflected by a port of optical fiber optical grating array (5) is from first of the second optical fibre collimator array (4)
The light beam of input is separated into mutually orthogonal two-beam by port input triple motion crystal (3k), triple motion crystal (3k)：o
Light and e light, the o light isolated sequentially pass through the 3rd half-wave plate (3h), the 3rd optical rotation plate (3g), obtain e light；The e light isolated
The 4th optical rotation plate (3j), the 4th half-wave plate (3i) are sequentially passed through, e light is obtained；The light for the mutually orthogonal two-beam isolated
Vector is adjusted to equidirectional：All it is e light；
Two beam e parallel lights inject second displacement crystal (3f), and the deflected refraction of light path, a branch of e light sequentially passes through the first optical rotation plate
(3c), the first half-wave plate (3b), obtains o light；Another beam e light sequentially passes through the second half-wave plate (3e), the second optical rotation plate (3d), obtains
To e light；The light vector of two beam e light is adjusted to mutually orthogonal direction：A branch of o light, a branch of e light；
A branch of o light, a branch of e light are injected after the first displacement crystal (3a), and a branch of output light is combined into by the first displacement crystal (3a), defeated
Go out the 3rd port to the first optical fibre collimator array (2).
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| CN201804132U (en) * | 2010-09-10 | 2011-04-20 | 佛山科学技术学院 | Eight-channel comb filter based on super-structured fiber Bragg grating |
| CN201886169U (en) * | 2010-05-11 | 2011-06-29 | 武汉奥新科技有限公司 | Multiplexing/demultiplexing double-function wavelength multiplexing device |
| CN202351455U (en) * | 2011-11-29 | 2012-07-25 | 中国计量学院 | Non-directional dispersion compensator based on symmetric chirped optical fiber grating |
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| CN201886169U (en) * | 2010-05-11 | 2011-06-29 | 武汉奥新科技有限公司 | Multiplexing/demultiplexing double-function wavelength multiplexing device |
| CN201804132U (en) * | 2010-09-10 | 2011-04-20 | 佛山科学技术学院 | Eight-channel comb filter based on super-structured fiber Bragg grating |
| CN202351455U (en) * | 2011-11-29 | 2012-07-25 | 中国计量学院 | Non-directional dispersion compensator based on symmetric chirped optical fiber grating |
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