CN102231008B - Tunable fiber integrated optical frequency comb - Google Patents
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- CN102231008B CN102231008B CN 201110165495 CN201110165495A CN102231008B CN 102231008 B CN102231008 B CN 102231008B CN 201110165495 CN201110165495 CN 201110165495 CN 201110165495 A CN201110165495 A CN 201110165495A CN 102231008 B CN102231008 B CN 102231008B
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Abstract
The invention provides a tunable fiber integrated optical frequency comb. The comb is composed of a 980/1550 nm WDM, a common single-mode fiber and an annular multi-core fiber parallel F-P interferometer group which are connected. A side surface extrusion is applied to the annular multi-core fiber parallel F-P interferometer group or the flexibility of the resonant cavity is controlled or the temperature gradient field change is controlled or the axial tension is controlled to realize the tune of the output optical frequency comb. Compared to a traditional optical frequency comb, the intense fiber integration characteristic of the comb provided in the invention makes the interferences from extraneous environment factors on the device mostly be common mode interferences. The invention is an all-fiber device and is characterized by small insertion loss, convenient installation and adjustment, simple manufacture and low cost. The comb is doped with various rare earth elements. Many kinds of rare earth elements are mixed and doped; hence an optical frequency comb of different wave bands and wide spectrums can be realized. The invention has advantages such as simple manufacturing process, intense fiber integration, good stability, small extraneous interferences, low loss, easy coupling and the like.
Description
Technical field
What the present invention relates to is a kind of tunable fiber integrated optical frequency comb, belongs to the optical fiber technology field.
Background technology
Optical frequency com refers to pulse laser series of discrete, equiwavelength's spacing, and its spectrum distribution is the spitting image of a comb.Optical frequency com is widely used in the optics atomic clock, hypersensitive chemistry detector, super laser instrument, the fields such as long-distance optical fiber communication and high sensitivity laser radar.The mankind utilize the femtosecond laser frequency comb of locked mode femto-second laser realization so that can utilize one high-precision " light chi " that optical frequency is realized extremely accurate measurement (Direct Link between Microwave and OpticalFrequencies with a 300THz Femtosecond Laser Comb, Phys.Rev.Lett.84,5102-5105,2000).Domestic Physics Inst., Chinese Academy of Sciences utilizes the femtosecond Ti∶Sapphire oscillator to make " high stable high-repetition-rate monolithic optical frequency com " (CN101846861).Femtosecond laser frequency comb has important application prospect to the development of optics atomic clock of future generation in Gernral Check-up and environmental monitoring field.Femtosecond laser frequency comb is a series of ultra-short pulse lasers, and its frequency interval is strictly equal, and the ultra-short pulse laser of certain wavelength is shown as a vertical line at spectrum, and only there is the light wave of this frequency in expression.And at optical fiber communication and sensory field of optic fibre, much lower for the requirement of the pulse width of optical frequency com and frequency interval.Utilize the interlock transmission spectrum of comb filter (Interleaver) of optics to be the feature of pectination, wide spectrum optical is injected, can obtain optical frequency comb (US6574049) at output terminal; Perhaps utilize the multiplexing function of Interleaver, the pulsed light of a wavelength is multiplexed into also can obtains optical frequency comb (US 7418168B2, US 7499653B2) in the optical fiber.Publication number is to propose in the patent document of CN 101401032 a kind ofly to adopt single modulator to produce the optical frequency com generating means with smooth spectral line characteristic.For long-distance optical fiber communication, the application of optical frequency comb can greatly increase the signal transmission capacity of simple optical fiber, can also reduce interference, the especially secure communication of each interchannel simultaneously, and the application benefit of optical frequency comb is a lot.
Up to the present, by the difference of pectination frequency-region signal generating means, the development of optical frequency com can be divided into following a few class: based on visible light and the near-infrared band frequency comb of titanium jewel locked mode femtosecond pulse; Infrared band frequency comb based on the Er-doped fiber femto-second laser; Strengthen the ultraviolet frequency comb in chamber based on the chamber external resonance; And based on the frequency comb of micro-cavity laser.
Summary of the invention
The object of the present invention is to provide a kind of easy, stable, reliable tunable fiber integrated optical frequency comb.
The object of the present invention is achieved like this:
By 980/1550nm WDM (wavelength division multiplexer), general single mode fiber and the parallel F-P interferometer group of ring-shaped multi-core fiber connect to form; The parallel F-P interferometer group of described ring-shaped multi-core fiber is applied the side extruding, or control the flexibility of resonator cavity, or the variation of control temperature gradient field, or the control axial tension, realize exporting the tuning of optical frequency comb.
The present invention can also comprise:
1, the parallel F-P interferometer group of described ring-shaped multi-core fiber is the parallel F-P interferometer group of transmission-type ring-shaped multi-core fiber, and the parallel F-P interferometer group of ring-shaped multi-core fiber consists of the transmission-type tunable fiber integrated optical frequency comb in the middle of being serially connected in two 980/1550nmWDM; The parallel F-P interferometer group of described ring-shaped multi-core fiber is to inscribe a pair of Bragg fiber grating at one section ring-shaped multi-core fiber fibre core to consist of parallel F-P interferometer group, and ring-shaped multi-core fiber two ends and general single mode fiber link together by the method for fused biconical taper.
2, describedly inscribe a pair of Bragg fiber grating at one section ring-shaped multi-core fiber fibre core and be, inscribe respectively a pair of parallel Bragg fiber grating group one section ring-shaped multi-core fiber fibre core both sides, and make that a pair of Bragg fiber grating has identical reflection kernel wavelength on each fibre core.
3, the parallel F-P interferometer group of described ring-shaped multi-core fiber is the parallel F-P interferometer group of reflective ring-shaped multi-core fiber, and a 980/1550nmWDM410 and the parallel F-P interferometer group serial connection of ring-shaped multi-core fiber consist of reflective tunable fiber integrated optical frequency comb; The parallel F-P interferometer group of described ring-shaped multi-core fiber is to inscribe the Bragg fiber grating in one section ring-shaped multi-core fiber fibre core left side, plating 1550nm wave band total reflection film consists of parallel F-P interferometer group as optical fiber end face reflector on the right-hand member fiber end face, and ring-shaped multi-core fiber left end and general single mode fiber link together by the method for fused biconical taper.
Input end WDM imports the 980nm pump light, draw the even beam splitting of cone toriconical structure 1 * N to enter in N the fibre core of ring-shaped multi-core fiber by general single mode fiber-ring-shaped multi-core fiber welding, the 980nm pump light excites the light of 1550nm wave band in N fibre core of erbium doping ring-shaped multi-core fiber, form laser through vibrating behind the Bragg Frequency Selecting by Fiber Bragg Grating to amplify in the F-P resonator cavity; The light that parallel each fibre core of F-P interferometer group of ring-shaped multi-core fiber is selected different frequency owing to its different Bragg fiber grating amplifies at internal oscillation, they all export the narrow-band impulse laser of a different wave length separately, pass through to obtain optical frequency comb by output terminal WDM output after ring-shaped multi-core fiber-general single mode fiber welding draws the N of cone toriconical structure * 1 bundling device to close ripple again.(push such as the side by external influence, resonator cavity is crooked, temperature gradient field and axial tension etc.) exert one's influence to the parallel super F-P chamber of ring-shaped multi-core fiber or to the frequency-selecting function of Bragg fiber grating, can realize exporting the comprehensively tuning of optical frequency comb spectrum.
The present invention is different from prior art, is the method for utilizing Fiber Bragg Grating structure F-P interferometer in having the doping ring-shaped multi-core fiber of different fiber core refractive indexs, produces a kind of tunable fiber integrated optical frequency comb.Fiber grating is one of of paramount importance optical passive components in field such as optical communication, light sensing and optical information processing, and multi-core fiber has obtained using more and more widely in society with its low cost and highly dense intensity.Fiber grating is applied in the multi-core fiber, not only saves the space, easy to operate, flexible, and can realize a lot of functions, construct new device.Utilize the architectural characteristic of multi-core fiber low cost and highly dense intensity, Fiber Bragg Grating structure F-P interferometer group in fibre core, easily realize the tuning of optical frequency comb, this optical frequency comb since its high fiber Integrated Trait so that device is subjected to the interference of external environment factor very little, full optical fibre device characteristic so that its to have an insertion loss very little, loss is low, Installation and Debugging are convenient, make the advantages such as simple, with low cost.
The present invention can also comprise such Some features:
1, inscribe two Bragg fiber grating pairs on the N of the described ring-shaped multi-core fiber fibre core, perhaps inscribe the Bragg fiber grating in the one side, other end fiber end face plating total reflection film consists of parallel F-P interferometer group.The former is the parallel F-P interferometer group of transmission-type, and the latter is reflective parallel F-P interferometer group.
2, two of described 980/1550nm WDM are together in series and in the parallel F-P interferometer group of centre access transmission-type, perhaps a 980/1550nm WDM and reflective parallel F-P interferometer group are connected in series formation transmission-type or reflective tunable fiber integrated optical frequency comb.Being connected between WDM and the ring-shaped multi-core fiber used general single mode fiber.
3, the 980nm pump light of described input end WDM input arm incoming fiber optic one-way isolator, its effect is to prevent that the 980nm pump light that returns from entering the output stability that pumping source affects pumping source.For the transmission-type tunable fiber integrated optical frequency comb, the external spectrometer of another 1550nm output arm of input end WDM is exported tunable fiber integrated optical frequency comb and is carried out Real-Time Monitoring; Inscribe total reflection optical fiber grating on the 980nm output arm of output terminal WDM, its effect is non-switched 980nm pump light to be reflected back in the doping ring-shaped multi-core fiber reuse, and improves the utilization factor of pump light.
4, described ring-shaped multi-core fiber and general single mode fiber link together by the welding coupled method, refer to that the tail end of general single mode fiber and an end of ring-shaped multi-core fiber utilize optical fiber splicer directly to dock fusion, then draw the cone machine to add the hot-drawn cone at two optical fiber solder joint places to the optical fiber utilization after the welding, form the toriconical structure as the even beam splitter of 1 * N light or combiner device at the solder joint place, N is ring-shaped multi-core fiber fibre core number here.For the parallel F-P interferometer group of transmission-type, two solder joints are arranged, a toriconical structure is as the even beam splitter of light, and another toriconical structure is as the combiner device; For reflective parallel F-P interferometer group, only have a solder joint, draw cone district toriconical structure both as the even beam splitter of light, again as the combiner device.
5, the reflectivity of a pair of Bragg fiber grating on parallel each fibre core of F-P interferometer group of described transmission-type is not identical: the reflectivity of interferometer input end grating is near 100%, and the reflectivity of output terminal grating is between 80%～90%; The reflectivity of described reflective parallel F-P interferometer group Bragg fiber grating is between 80%～90%.
6, described ring-shaped multi-core fiber fibre core one end Bragg fiber grating writes simultaneously with same mask plate is disposable, and how much distributions of ring-shaped multi-core fiber fibre core one end Bragg fiber grating are identical in theory.
7, the refractive index of a described ring-shaped multi-core fiber N fibre core on purpose is designed to successively slightly difference, because it is identical that the fiber grating of parallel F-P interferometer group one end of ring-shaped multi-core fiber distributes for how much, and different fiber core refractive indexs makes the equivalent refractive index of fiber grating different, thereby the fiber grating of a ring-shaped multi-core fiber N fibre core is selected light stimulated oscillation, the amplification output of different frequency.Go out the index distribution of a ring-shaped multi-core fiber N fibre core according to parameter backwards calculation such as target light frequency comb frequency interval, peak wavelengths, the ring-shaped multi-core fiber that draws so out can be produced optical frequency comb near target according to scheme provided by the invention.
8, the parallel F-P interferometer group of described ring-shaped multi-core fiber is pushed by the side, resonator cavity is crooked, the external influence such as temperature gradient field and axial tension, the external influence of these artificial controlled modulating actions is by changing the spectral envelope of the power coupling modulation output optical frequency comb between N fibre core of ring-shaped multi-core fiber, by the frequency distribution of consistent change Bragg fiber grating reflection kernel wavelength-modulated output optical frequency comb spectrum.
9, described ring-shaped multi-core fiber fibre core can carry out the erbium doping, realizes reinforcement and the amplification of signal.The different rare earth element of mixing comprises multiple rare earth element mixing and doping, can realize different-waveband, wide spectrum optical frequency comb.
Advantage of the present invention is: 1. compare with traditional optical frequency comb, its high fiber Integrated Trait is so that device is subjected to the interference of external environment factor mostly to be common mode interference; 2. full optical fibre device, insertion loss is very little, and Installation and Debugging are convenient, make simple, with low cost; 3. the different rare earth element of mixing comprises multiple rare earth element mixing and doping, can realize different-waveband, wide spectrum optical frequency comb.
The present invention has that manufacturing process is simple, high fiber is integrated, good stability, be subjected to that external interference is little, loss is low and the advantage such as easy coupling.
Description of drawings
Fig. 1 is ring-shaped multi-core fiber sectional view of the present invention;
Fig. 2 is transmission-type tunable fiber integrated optical frequency comb principle schematic of the present invention;
Fig. 3 is the parallel F-P interferometer group structural representation of transmission-type of the present invention;
Fig. 4 is the reflective tunable fiber integrated optical frequency comb principle schematic of the present invention;
Fig. 5 is the reflective parallel F-P interferometer group structural representation of the present invention;
Fig. 6 is the parallel tuning schematic diagram of F-P interferometer group of ring-shaped multi-core fiber of the present invention.
Embodiment
For example the present invention is done more detailed description below in conjunction with accompanying drawing:
Fig. 1 is ring-shaped multi-core fiber sectional view of the present invention; N fibre core 1 (being 10 cores shown in the figure) equidistantly consists of the annular structures of concentric circless with covering 2, and each fibre core 1 is surrounded by covering 2, and each fibre core 1 diameter is identical with the general single mode fiber core diameter.
Fig. 2 is the principle schematic of embodiments of the invention 1, the 980nm pump light 201 that pumping source sends is imported by the 980nm fiber arm 211 of input end WDM210, draw cone toriconical structure 1 * N beam splitter evenly to be divided into N bundle light by ring-shaped multi-core fiber left end 227 single-mode fibers-ring-shaped multi-core fiber welding, enter respectively in N the fibre core of ring-shaped multi-core fiber 222.980nm pump light 201 excites the light of 1550nm wave band in N fibre core of annular multicore erbium doped optic fibre 222, vibration is amplified and formed laser in the F-P resonator cavity after ring-shaped multi-core fiber 222 every fibre core left and right sides Bragg fiber grating 229,231 consistent frequency-selecting.The N of ring-shaped multi-core fiber 222 fiber core refractive index is designed to successively slightly difference, and the fiber grating that fiber grating how much distributes owing to parallel F-P interferometer group one end of ring-shaped multi-core fiber is with the disposable reason that writes simultaneously of same mask plate, they are identical, different fiber core refractive indexs is so that the equivalent refractive index of fiber grating is different, so the fiber grating 229,231 on the N of ring-shaped multi-core fiber 222 fibre core is selected light stimulated oscillation, the amplification output of different frequency.N narrow-band impulse laser that wavelength is different of ring-shaped multi-core fiber 222 inner N fibre cores output draws cone toriconical structure N * 1 bundling device to close behind the ripple to be exported by the 1550nm fiber arm 241 of output terminal WDM240 through ring-shaped multi-core fiber 222 right-hand members 228 ring-shaped multi-core fiber-single-mode fiber welding to obtain optical frequency comb 202.Wherein need behind the optical fiber fusion then to carry out package curing with epoxy resin through cleaning.Among this embodiment, be connected to optical fiber one-way isolator 213 on the 980nm fiber arm 211 of input end WDM210, prevent that the 980nm pump light that returns from entering the output stability that pumping source affects the source; Because the reflectivity of fiber grating 229 reflection kernel wavelength is near 100%, so the light of the light of the 1550nm wave band that transmits from fiber grating 229 and the 1550nm wave band of fiber grating 231 outputs has very significantly complementarity at spectrum.Utilize this complementarity, external spectroanalysis instrument on the 1550nm of input end WDM210 fiber arm 212 can carry out Real-Time Monitoring according to the optical frequency comb 202 that the spectrum of this arm output is exported output terminal; Be connected to total reflection optical fiber grating 243 on the 980nm fiber arm 242 of output terminal WDM240, effect is the non-switched pump light of output terminal is reflected back in the doping ring-shaped multi-core fiber and reuses, and improves pumping efficiency.The Bragg fiber grating 229,231 of ring-shaped multi-core fiber 222 fibre core both sides can utilize the phase mask plate method to write among this embodiment, and each sidelight grid writes simultaneously with same mask plate is disposable.
Fig. 3 is the parallel F-P interferometer group structural representation of transmission-type of the present invention; With optical fiber splicer the tail end of general single mode fiber 221 is aimed at the left end of one section ring-shaped multi-core fiber 222, make the fibre core 224 of single-mode fiber 221 be positioned at the circle centre position that ring-shaped multi-core fiber fibre core 225 surrounds, then directly fuse with optical fiber splicer, then draw the cone machine to add the hot-drawn cone at two optical fiber solder joint places to the optical fiber utilization after the welding, form toriconical structure 227 at the solder joint place as 1 * 10 (fibre core of ring-shaped multi-core fiber shown in figure number is 10) the even beam splitter of light.Equally, with optical fiber splicer the right-hand member of ring-shaped multi-core fiber 222 is aimed at the head end of general single mode fiber 223, make the fibre core 226 of single-mode fiber 223 be positioned at the circle centre position that ring-shaped multi-core fiber fibre core 225 surrounds, then directly fuse with optical fiber splicer, then draw the cone machine to add the hot-drawn cone at two optical fiber solder joint places to the optical fiber utilization after the welding, form toriconical structure 228 at the solder joint place as 10 * 1 combiner devices.Ring-shaped multi-core fiber fibre core 225 left and right sides between ring-shaped multi-core fiber and single-mode fiber solder joint write two Bragg fiber grating pair 229-231 and consist of the parallel F-P interferometer group of transmission-types, and 10 fibre core left and right sides Bragg fiber gratings 229,231 of ring-shaped multi-core fiber 222 adopt respectively that same mask plate is disposable to be write simultaneously.The parallel F-P interferometer group resonator cavity of ring-shaped multi-core fiber applied external influence 251 (such as extruding, bending and axial tension etc.) or the ring-shaped multi-core fiber both sides are applied identical external influence 252 (such as side extruding, temperature gradient field and axial tension etc.) with the positions are conformed to each other of fiber grating can realize the comprehensively tuning of the parallel F-P interferometer group of transmission-type.
Fig. 4 is the principle schematic of embodiments of the invention 2, and in the present embodiment, its principle of work is substantially the same manner as Example 1, just structurally changes to some extent.Realize the most crucial part of tunable fiber integrated optical frequency comb, the ring-shaped multi-core fiber F-P interferometer group that walks abreast, in embodiment 1, consisted of by two Bragg fiber grating pair 229-231, in embodiment 2, then substituted by left Bragg fiber grating 425 and right optical fiber end face reflector 427 unitized constructions, namely utilize optical fiber end face reflector 427 that the parallel two ends, the F-P interferometer group resonator cavity left and right sides of ring-shaped multi-core fiber fiber grating is integrated into one.In embodiment 2, input WDM and output WDM also are integrated into one.Wherein, the 980nm fiber arm 411 of WDM410 is connected to optical fiber one-way isolator 413 as the input end of 980nm pump light 401 on it, prevents that the light that returns from entering pumping source and affecting its output stability; The 1550nm fiber arm 412 of WDM410 is as the output terminal of system, and the parallel F-P interferometer group 420 of annular multicore doped fiber produces optical frequency comb 402 by this arm output.The Bragg fiber grating 426 in ring-shaped multi-core fiber 422 fibre cores left sides can utilize the phase mask plate method to write among this embodiment, and the grating on N fibre core all writes simultaneously with same mask plate is disposable.Optical fiber end face reflector 427 can utilize vacuum coating equipment to the ring-shaped multi-core fiber end face plating 1550nm wave band total reflection film perpendicular to the shaft axis of optic fibre best bright finish among this embodiment.
Fig. 5 is the reflective parallel F-P interferometer group structural representation of the present invention; With optical fiber splicer the tail end of general single mode fiber 421 is aimed at the left end of one section ring-shaped multi-core fiber 422, make the fibre core 423 of single-mode fiber 421 be positioned at the circle centre position that ring-shaped multi-core fiber fibre core 424 surrounds, then directly fuse with optical fiber splicer, then draw the cone machine to add the hot-drawn cone at two optical fiber solder joint places to the optical fiber utilization after the welding, form toriconical structure 425 at the solder joint place as 1 * 10 (fibre core of ring-shaped multi-core fiber shown in figure number is 10) the even beam splitter of light; When light oppositely passed through toriconical structure 425, it was just as the combiner device.Plate one deck 1550nm wave band ATR Optical film as optical fiber end face reflector 427 on ring-shaped multi-core fiber 422 the right perpendicular to the fiber end face of optical fiber axial direction, consist of reflective parallel F-P interferometer group with the fiber grating 426 that writes on the fibre core of ring-shaped multi-core fiber left side.Bragg fiber grating on 10 fibre cores in ring-shaped multi-core fiber 422 left sides adopts the phase mask plate method to write simultaneously with same mask plate is disposable.Compare with the parallel F-P interferometer group of transmission-type, the advantage of reflective maximum is to utilize optical fiber end face reflector 427 that the parallel two ends, the F-P interferometer group resonator cavity left and right sides of ring-shaped multi-core fiber fiber grating is integrated into one, is convenient to the unanimously tuning of two ends fiber grating reflection kernel wavelength.The parallel F-P interferometer group resonator cavity of ring-shaped multi-core fiber applied external influence 431 (such as extruding, bending and axial tension etc.) or the ring-shaped multi-core fiber left side is applied external influence 432 (such as side extruding, temperature gradient field and axial tension etc.) with the position of fiber grating can realize the comprehensively tuning of reflective parallel F-P interferometer group.
Fig. 6 is the parallel tuning schematic diagram of F-P interferometer group of ring-shaped multi-core fiber of the present invention; What wherein Fig. 6 (a) provided is the parallel tuning schematic diagram of F-P interferometer group of transmission-type, and what Fig. 6 (b) provided is the tuning schematic diagram of reflective parallel F-P interferometer group.For the parallel F-P interferometer group of the transmission-type shown in Fig. 6 (a), general single mode fiber 611,612 is respectively as the input and output side of interferometer, be ring-shaped multi-core fiber between the single-mode fiber, single-mode fiber and ring-shaped multi-core fiber draw the method for cone to link together by welding.For realizing the unanimously tuning of parallel F-P interferometer group resonator cavity 616 two ends fiber gratings 613,614 reflection kernel wavelength, fiber grating 613,614 is concentrated in the control system 615.For the reflective parallel F-P interferometer group shown in Fig. 6 (b), general single mode fiber 621 is thereafter ring-shaped multi-core fiber simultaneously as the interferometer input and output side, and single-mode fiber and ring-shaped multi-core fiber draw the method for cone to link together by welding.Utilize optical fiber end face reflector 624, the parallel two ends, F-P interferometer group resonator cavity 625 left and right sides of ring-shaped multi-core fiber fiber grating is integrated into a fiber grating 622, is in the control system 623.Separately to the parallel F-P interferometer group resonator cavity 616,625 of ring-shaped multi-core fiber push, the external influences such as bending and axial tension, can carry out tuning to output optical frequency comb spectral envelope.In control system 615, fiber grating 613,614 is carried out side extruding, the consistent external influences such as temperature gradient field and axial tension; In control system 623, fiber grating 622 is carried out the side extruding, the external influences such as temperature gradient field and axial tension can be realized the dual tuned to output optical frequency comb spectral frequency and spectral envelope.
Tunable fiber integrated optical frequency comb of the present invention as can be seen from the above-described embodiment, it has, and manufacturing process is simple, high fiber is integrated, good stability, be subjected to that external interference is little, loss is low and the advantage such as easy coupling.Can be used for fiber optic communication field.
Claims (2)
1. tunable fiber integrated optical frequency comb is characterized in that: by 980/1550nm WDM, general single mode fiber and the parallel F-P interferometer group of ring-shaped multi-core fiber connect to form; The refractive index of ring-shaped multi-core fiber N fibre core on purpose is designed to successively slightly difference, the parallel F-P interferometer group of described ring-shaped multi-core fiber is applied the side extruding, or the flexibility of control resonator cavity, or the control temperature gradient field changes, or the control axial tension, realize exporting the tuning of optical frequency comb;
The parallel F-P interferometer group of described ring-shaped multi-core fiber is the parallel F-P interferometer group of transmission-type ring-shaped multi-core fiber, and the parallel F-P interferometer group of ring-shaped multi-core fiber consists of the transmission-type tunable fiber integrated optical frequency comb in the middle of being serially connected in two 980/1550nmWDM; The parallel F-P interferometer group of described ring-shaped multi-core fiber is to inscribe a pair of Bragg fiber grating at one section ring-shaped multi-core fiber fibre core to consist of parallel F-P interferometer group, and ring-shaped multi-core fiber two ends and general single mode fiber link together by the method for fused biconical taper;
Describedly inscribe a pair of Bragg fiber grating at one section ring-shaped multi-core fiber fibre core and be, inscribe respectively a pair of parallel Bragg fiber grating group one section ring-shaped multi-core fiber fibre core both sides, and make that a pair of Bragg fiber grating has identical reflection kernel wavelength on each fibre core.
2. tunable fiber integrated optical frequency comb is characterized in that: by 980/1550nm WDM, general single mode fiber and the parallel F-P interferometer group of ring-shaped multi-core fiber connect to form; The refractive index of ring-shaped multi-core fiber N fibre core on purpose is designed to successively slightly difference, the parallel F-P interferometer group of described ring-shaped multi-core fiber is applied the side extruding, or the flexibility of control resonator cavity, or the control temperature gradient field changes, or the control axial tension, realize exporting the tuning of optical frequency comb;
The parallel F-P interferometer group of described ring-shaped multi-core fiber is the parallel F-P interferometer group of reflective ring-shaped multi-core fiber, and a 980/1550nmWDM410 and the parallel F-P interferometer group serial connection of ring-shaped multi-core fiber consist of reflective tunable fiber integrated optical frequency comb; The parallel F-P interferometer group of described ring-shaped multi-core fiber is to inscribe the Bragg fiber grating in one section ring-shaped multi-core fiber fibre core left side, plating 1550nm wave band total reflection film consists of parallel F-P interferometer group as optical fiber end face reflector on the right-hand member fiber end face, and ring-shaped multi-core fiber left end and general single mode fiber link together by the method for fused biconical taper.
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| CN103235463B (en) * | 2013-04-15 | 2016-05-25 | 湖南大学 | High stable, large frequency interval, frequency interval adjustable optical frequency comb |
| CN105305212B (en) * | 2015-11-02 | 2018-07-27 | 河北大学 | The sub- cavity mold block of integrated passive and manufacturing method and optical fiber laser |
| CN108507616B (en) * | 2018-04-11 | 2019-08-06 | 中国科学院武汉物理与数学研究所 | The zero thermal expansion temperature spot and fineness rapid measurement device and method of Fabry Perot chamber |
| CN109708775A (en) * | 2019-01-22 | 2019-05-03 | 北京信息科技大学 | The temperature of photonic crystal fiber FP-FBG structure, index sensor and preparation method thereof |
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