CN108897099A - A kind of full polarization fiber interference type comb filter - Google Patents
A kind of full polarization fiber interference type comb filter Download PDFInfo
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- CN108897099A CN108897099A CN201811010682.9A CN201811010682A CN108897099A CN 108897099 A CN108897099 A CN 108897099A CN 201811010682 A CN201811010682 A CN 201811010682A CN 108897099 A CN108897099 A CN 108897099A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2773—Polarisation splitting or combining
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/095—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure
- G02F1/0955—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure used as non-reciprocal devices, e.g. optical isolators, circulators
Abstract
The invention discloses a kind of full polarization fiber interference type comb filter,It is made of fibre optic polarizing beam splitter and line style arm,The fibre optic polarizing beam splitter includes the port a,The port b and the port c,Fusing is formed with optical fiber loop between the port a and the port b,The line style arm is by the optical fiber collimator that sets gradually,Non-reciprocal phase bias device and polarization beam apparatus composition,It is connected between the port c and optical fiber collimator by polarization maintaining optical fibre,Polarization maintaining optical fibre between the port c and optical fiber collimator is equipped with the fusion point to shaft angle degree,Polarization beam apparatus outputs and inputs device as comb filter,Optical signal is incident from polarization beam apparatus,The optical signal along the clockwise and counterclockwise transmission of optical fiber loop is broken down into after line style arm,It is transmitted after a week in optical fiber loop,Beam is closed into line style arm,Finally interfered at polarization beam apparatus.Optical fiber used in the optical fiber filter is polarization maintaining optical fibre, realizes spectral filtering using Sagnac interference effect.
Description
Technical field
The present invention relates to the fields such as fiber optic communication, Fibre Optical Sensor, multi-wavelength optical fiber laser, and in particular to a kind of all risk insurance is inclined
Optical fiber interference type comb filter.
Background technique
With the rapid development of information technology, the information such as language, image, video are increasing, the friendship between various information
It changes and exchanges also more and more, the more and more harsh requirement of this bandwidth and capacity proposition to communication network.Currently, fiber optic communication
It reaches its maturity, the development of dense wave division multipurpose (DWDM) technology substantially increases the capacity of communication network, becomes fiber optic communication neck
The mainstream technology in domain.Fiber comb filter is a kind of excellent DWDM device, can be used for wavelength-division multiplex, demultiplexing, properly
Power system capacity can be expanded as much as possible by choosing comb filter, improve message transmission capability.In addition, by fiber comb filter
Applied in optical fiber laser, multiple-wavelength laser may be implemented；Applied to fields such as Fibre Optical Sensors.
The fiber comb filter of function admirable is the key that DWDM technology.Filtering interval, filtering bandwidth, central wavelength etc.
The humorous comb filter of Parameter adjustable is widely used in dynamic dwdm system.Currently, common optical fiber pectination filter
Wave device mainly has：Array waveguide grating (AWG), Mach-Zehnder (M-Z) interferometer, Sagnac filter etc..However, array wave
The wavelength interval of guide grating and bandwidth are non-adjustable, are unable to satisfy the demand of dynamic dwdm system.The structure letter of M-Z fibre optic interferometer
It is single, it is at low cost, but the optical path difference of two-arm is required very high.It is usually added into one section of polarization maintaining optical fibre in Sagnac filter and one inclined
Vibration controller realizes filter action, cascade several sagnac filters with different filtering characteristics it is available meet it is special
The filter of filtering interval, filtering bandwidth, but environmental stability is poor.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, provides a kind of suitable for fields such as fiber optic communications
The full polarization fiber interference type comb filter that structure is simple, filtering bandwidth is continuously adjustable, light used in the optical fiber filter
Fibre is polarization maintaining optical fibre, realizes spectral filtering using Sagnac interference effect.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of full polarization fiber interference type comb filter, is made of fibre optic polarizing beam splitter and line style arm, the optical fiber
Polarization beam apparatus includes the port a, the port b and the port c, and fusing is formed with optical fiber loop, the line style between the port a and the port b
Arm is made of optical fiber collimator, non-reciprocal phase bias device and the polarization beam apparatus set gradually, the port c and fiber optic collimator
It is connected between device by polarization maintaining optical fibre, the polarization maintaining optical fibre between the port c and optical fiber collimator, which is equipped with to have, melts shaft angle degree
Contact, output and input device of the polarization beam apparatus as comb filter, optical signal is incident from polarization beam apparatus, warp
It is broken down into the optical signal along the clockwise and counterclockwise transmission of optical fiber loop after crossing line style arm, is passed in optical fiber loop
It is defeated after a week, close beam into line style arm, finally interfered at polarization beam apparatus.
Further, the non-reciprocal phase bias device is nonreciprocal optical device, by Faraday polarization apparatus, a quarter
Wave plate and half wave plate group at.
Further, the fibre optic polarizing beam splitter, optical fiber collimator are polarization-preserving optical fibre device.
Further, the value range to shaft angle degree is 0-90 °.
Further, one section of gain fibre can be added in optical fiber loop, for providing amplification for optical signal.
Compared with prior art, beneficial effect brought by technical solution of the present invention is：
Comb filter structure of the present invention is simple, and filtering interval is related with the length of one section of specific polarization maintaining optical fibre, can pass through
The length for changing this specific polarization maintaining optical fibre realizes the adjusting of filtering interval.The comb filter has transmission mode and reflection side
Two kinds of operating modes of formula can select operating mode according to application demand.By adjusting non-reciprocal phase bias device and optical fiber welding
Angle is connect, passband three dB bandwidth is continuously adjustable, it can be achieved that the spectrum of big flatness exports, and passband isolation may be up to 22dB.It inserts
Enter to be lost it is low, can be compatible with telecommunication optical fiber.Full polarization fibre structure keeps its environmental stability high, conducive to being widely popularized.
Detailed description of the invention
Fig. 1 is filter construction schematic diagram of the present invention.
Fig. 2 is the structure chart of fibre optic polarizing beam splitter.
Fig. 3-1 to Fig. 5-2 is the transmitted spectrum of filter of the present invention and reflection under different polarization maintaining optical fibre welding angles
Spectrogram.
Appended drawing reference：1- optical fiber loop, 2- fibre optic polarizing beam splitter, 3- polarization maintaining optical fibre, 4- fusion point, 5- polarization maintaining optical fibre,
6- optical fiber collimator, 7- non-reciprocal phase bias device, 8- polarization beam apparatus；A, b, c are three of fibre optic polarizing beam splitter respectively
Port.
Specific embodiment
Embodiment of the present invention is described in further detail below with reference to specific embodiment.
The principle of comb filter involved in this patent is Sagnac interference effect.The comb filter is by optical fiber loop
1 and line style arm composition, as shown in Figure 1.Optical fiber loop 1 it is directly fused by the end a of fibre optic polarizing beam splitter (PBC) 2 and the end b and
At the structure of fibre optic polarizing beam splitter 2 is as shown in Figure 2.Line style arm include optical fiber collimator 6, non-reciprocal phase bias device 7 and partially
Shake beam splitter (PBS) 8.In the end c of fibre optic polarizing beam splitter 2 and 6 tail optical fiber fusion process of optical fiber collimator, it is artificially introduced a band
There is the fusion point 4 to shaft angle degree, which is 0-90 ° (not including 0 ° and 90 °)；Fusion point 4 and optical fiber
It is connected between the port c of polarization beam apparatus 2 by polarization maintaining optical fibre 3, passes through polarization maintaining optical fibre 5 between fusion point 4 and optical fiber collimator 6
Connection.From the optical signal of the end c incident optical loop 1, fast, slow axis component will be respectively along suitable after 2 beam splitting of fibre optic polarizing beam splitter
Hour hands and counterclockwise transmission, and transmitted along ring inner fiber slow axis, therefore the pulse transmitted in optical fiber loop 1 only includes
Slow axis component.And when transmitting in the online arm of pulse simultaneously include fast, slow axis component.Between polarization maintaining optical fibre to shaft angle degree, non-
The asymmetrical opticals processes such as reciprocity phase bias device provide certain phase difference for the optical signal transmitted in opposite directions, utilize meet
Interference effect realizes filter action.Non-reciprocal phase bias device 7 is nonreciprocal optical device, can be by Faraday polarization apparatus, four points
One of wave plate, half-wave plate combine to obtain.All optical fibre devices in comb filter use polarization maintaining optical fibre.
Further, it is also possible to one section of gain fibre be added in optical fiber loop 1, for providing amplification for optical signal.
Analytical calculation is carried out with transmittance function of the Jones matrix theory to comb filter involved in this patent below.
Used optical device Jones matrix is shown in Table 1.
The Jones matrix of 1 optical device of table
The pulse of random polarization state becomes the linearly polarized light of horizontal direction after polarization beam apparatus 8 is transmitted into filter,
Therefore the Jones matrix of incident light is availableIt indicates.The linearly polarized light becomes oval under the effect of non-reciprocal phase bias device 7
Polarised light, along polarization maintaining optical fibre, fast, slow axis is transmitted.After 2 beam splitting of fibre optic polarizing beam splitter, fast, slow axis component will be respectively along suitable
Hour hands and counterclockwise transmission.Transmission closes beam to line style arm through fibre optic polarizing beam splitter 2 after a week, respectively becomes slow, fast axle
Component.Converge again by non-reciprocal phase bias device 7, and at polarization beam apparatus 8, interferes.WithWithTable respectively
Show in optical fiber loop along the optical signal transmitted clockwise and counterclockwise.Have：
In above formula,Refer to the corresponding Jones matrix of polarization maintaining optical fibre 5 between optical fiber collimator 6 and fusion point 4,Indicate the corresponding Jones matrix of polarization maintaining optical fibre 3 between the end c and fusion point 4 of fibre optic polarizing beam splitter 2.Notice ring
Interior opposite transmission pulse only includes slow axis component, therefore polarization maintaining optical fibre is fast in optical fiber loop, refringence of slow axis will not introduce
Linear phase shift between opposite transmission pulse is poor.For simplicity when calculating, ignore guarantor when pulse is transmitted in optical fiber loop 1
Polarisation fibre Jones matrix.Welding angle of the α between polarization maintaining optical fibre 5 and polarization maintaining optical fibre 3, value range are 0-90 °.In addition, by
In the particularity of fibre optic polarizing beam splitter 2, the fast axis component of the pulse transmitted in line arm originally can edge after optical fiber loop
The slow axis transmission of line style arm optical fiber, original pulse slow axis component will be transmitted along the fast axle of line style arm optical fiber.Therefore it is counting
Matrix is introduced when calculation
Finally,WithConverge at polarization beam apparatus 8, and interfere, Transmission field and reflection light field are used respectively
WithIt indicates, then has：
The power of Transmission field, reflection light field and incident field can be expressed as：
The transmitance and reflectivity of the pectination optical fiber filter can be obtained by algebraic operation, respectively：
Known by above formula, transmitance, reflectivity and the non-reciprocal phase bias device 7 of comb filter, polarization maintaining optical fibre 5 and polarization-maintaining
The length to shaft angle degree, polarization maintaining optical fibre 5 of fusion point between optical fiber 3 is related with double refraction amount, with the polarization state of incident light and
Polarization maintaining optical fibre 3 is unrelated.When these parameters are fixed, transmitance, the function that reflectivity is lambda1-wavelength λ can be considered that wavelength is filtered
Wave device.If the phase shift that phase bias device introduces makes justTerm coefficient is zero, and filtering cycle is Δ λ=λ2/2BL1, otherwise filter
Wave period is Δ λ=λ2/BL1.Filtering interval is directly related with the length of polarization maintaining optical fibre 5.
Known by transmittance function, when α=0 ° or α=90 °,WithCoefficient be 0, the comb filter
Respond, no filter effect unrelated with wavelength.Therefore the fusion point in line style arm between polarization maintaining optical fibre 5 and polarization maintaining optical fibre 3 to axis
Angle is the key that realize wavelength filtering effect, it is necessary to assure α ≠ 0 and α ≠ 90 °.
Choose λ0=1550nm, β=0, θ=30 °, L1=0.46m, α=20 °, it is 10nm's that wavelength interval, which may be implemented,
The three dB bandwidth of flat-top filtering, transmitted spectrum is 3nm, and transmitted spectrum and reflectance spectrum are as shown in Fig. 3-1 and Fig. 3-2.Keep other
Parameter constant, if α=35 °, the three dB bandwidth of obtained transmitted spectrum becomes 2.5nm, transmitted spectrum and reflectance spectrum such as Fig. 4-1
With shown in Fig. 4-2.
Choose λ0=1550nm, β=0, θ=30 °, L1=0.46m, α=45 °, filtering interval become 5nm, and transmitance is bent
Line and reflectance curve are as shown in Fig. 5-1 and Fig. 5-2.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say
Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from
In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (5)
1. a kind of full polarization fiber interference type comb filter, which is characterized in that by fibre optic polarizing beam splitter (2) and line style arm group
At the fibre optic polarizing beam splitter (2) includes the port a, the port b and the port c, fuses and is formed between the port a and the port b
Optical fiber loop (1), the line style arm is by the optical fiber collimator (6), non-reciprocal phase bias device (7) and the polarization beam splitting that set gradually
Device (8) composition, is connected between the port c and optical fiber collimator (6) by polarization maintaining optical fibre, the port c and optical fiber collimator (6) it
Between polarization maintaining optical fibre be equipped with to the fusion point (4) of shaft angle degree, the polarization beam apparatus (8) is as the defeated of comb filter
Enter and output device, optical signal incidence at polarization beam apparatus (8) are broken down into suitable along optical fiber loop (1) after line style arm
Clockwise and the counterclockwise optical signal of transmission, transmission after a week, closes beam into line style arm, most in optical fiber loop (1)
It is interfered at polarization beam apparatus (8) eventually.
2. a kind of full polarization fiber interference type comb filter according to claim 1, which is characterized in that the nonreciprocal phase
Position bias device (7) be nonreciprocal optical device, by Faraday polarization apparatus, quarter-wave plate and half wave plate group at.
3. a kind of full polarization fiber interference type comb filter according to claim 1, which is characterized in that the optical fiber polarisation
Beam splitter (2), optical fiber collimator (6) are polarization-preserving optical fibre device.
4. a kind of full polarization fiber interference type comb filter according to claim 1, which is characterized in that described to shaft angle degree
Value range be 0-90 °.
5. a kind of full polarization fiber interference type comb filter according to claim 1, which is characterized in that optical fiber loop (1)
It is interior that one section of gain fibre is added, for providing amplification for optical signal.
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| CN201811010682.9A CN108897099B (en) | 2018-08-31 | 2018-08-31 | Full polarization maintaining optical fiber interference type comb filter |
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| CN201811010682.9A CN108897099B (en) | 2018-08-31 | 2018-08-31 | Full polarization maintaining optical fiber interference type comb filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797742A (en) * | 2019-10-18 | 2020-02-14 | 天津大学 | High repetition frequency full polarization-maintaining 9-shaped cavity mode-locked laser |
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| US6125220A (en) * | 1998-12-23 | 2000-09-26 | Copner; Nigel | Interferometric optical device including a resonant optical cavity |
| CN101551490A (en) * | 2009-04-30 | 2009-10-07 | 天津理工大学 | Sagnac interferometer type comb filter with channel spacing unrelated with operating wavelength |
| CN102681096A (en) * | 2011-03-17 | 2012-09-19 | 昂纳信息技术（深圳）有限公司 | Polarized light interference type comb filter |
| CN103576330A (en) * | 2012-08-03 | 2014-02-12 | 诺方（哈尔滨）科技股份有限公司 | Interference assembly and optical comb filter |
-
2018
- 2018-08-31 CN CN201811010682.9A patent/CN108897099B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6125220A (en) * | 1998-12-23 | 2000-09-26 | Copner; Nigel | Interferometric optical device including a resonant optical cavity |
| CN101551490A (en) * | 2009-04-30 | 2009-10-07 | 天津理工大学 | Sagnac interferometer type comb filter with channel spacing unrelated with operating wavelength |
| CN102681096A (en) * | 2011-03-17 | 2012-09-19 | 昂纳信息技术（深圳）有限公司 | Polarized light interference type comb filter |
| CN103576330A (en) * | 2012-08-03 | 2014-02-12 | 诺方（哈尔滨）科技股份有限公司 | Interference assembly and optical comb filter |
Non-Patent Citations (3)
| Title |
|---|
| RAYMOND M.SOVA ET.AL: "Tunable all-fiber birefringence comb filters", 《OFC 2002》 * |
| 李殿军: "《光纤激光器和光纤放大器基础》", 31 October 2016, 国防工业出版社 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797742A (en) * | 2019-10-18 | 2020-02-14 | 天津大学 | High repetition frequency full polarization-maintaining 9-shaped cavity mode-locked laser |
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