CN205646421U - Low -cost tunable light structures with carousel and multiaspect reflection element - Google Patents

Abstract

The utility model discloses a low -cost tunable light structures with carousel and multiaspect reflection element, include the carousel of constituteing by the metalwork of a solitary metalwork and two separation, wherein a plurality of reflection element independent adjustments and installation, a servo motor for the carousel rotates, a diffracting object grating for the scattering incident beam forms the littrow structure that is used for filtering different optical wavelength, and gain medium -, like semiconductor light amplifier (SOA) or erbium doped fiber amplifier (EDFA) for move in fiber laser's annular or linear structure. In addition, repeat filter configuration in M synchronous branch and improve harmonious scanning frequency. The utility model discloses it is with low costs, utilize the multiple -branching construction to improve scanning frequency, reduce reflection element's quantity under the condition that does not reduce scanning frequency, improve scanning frequency under the condition that does not increase reflection element quantity, improve scanning frequency under the condition that does not improve motor rotation number.

Description

A kind of low cost tunable optical source structure with rotating disk and multiaspect reflecting element

Technical field

This utility model relates to a kind of low cost tunable optical source structure with rotating disk and multiaspect reflecting element.

Background technology

For a long time, wavelength sweep laser instrument is considered as the light source in following several application, including: phase dried layer Analysis imaging (biomedical imaging), optical reflection are measured, sensor demodulates and T & M.At optics In the biomedical applications of frequency domain imaging, owing to sweep speed determines image taking speed, therefore high tuning repetitive rate It is ideal.Critical component in these technology is light source；It must be stablized, and divides for high spatial During resolution the most tunable, run with high scanning speed, use cost is low simultaneously.

In all available methods, broadband ASE (ASE) source is connected to annular or linear structure In tunable optic filter on.Two kinds of wavelength tuning schemes pass through checking, i.e. Fiber Optic Sensor background of cloth Perot Tunable optic filter (FFP-TF) and polygon mirror structure.The first scheme uses the FFP-TF of Piezoelectric Driving Produce sinusoidal bi-directional wavelength scanning.Bilateral scanning is unsuitable for some application.In the second structure, revolving mirror The angle of incidence of light is transformed into the dispersion element of such as grid, in order to produce linear wave long scan.High speed rotating Mirror can be a galvanometer or exposure subsystem.

The expense of galvanometer and polygon prism structure is the most sufficiently expensive.In addition to accelerator, galvanometer also uses one Plant moving-magnetic type torque motor technology, make single-surface mirror forwardly and rearwardly wave with the speed of millions of Radian per second.Remove Cost is high, and galvanometer additionally provides bilateral scanning.In exposure subsystem structure, a polygon metalwork (logical producing is aluminum) is to manufacture with point-device angle, and is polished and coating, to obtain a mirror Face.In addition to using high-speed electric expreess locomotive, the manufacturing cost of polygon prism makes it still compare for a lot of application Expensive.

The tunable optical fiber laser of standard toroidal structure include wavelength selective filters (or tunable optic filter), Gain media (such as EDFA or SOA), circulator are (if tunable optic filter is reflective tunable filtering Device), one or more Polarization Controller, a fiber coupler, wherein fiber coupler enters by some light Enter output port, some light is maintained in loop configuration, as reference paper ...

The tunable optical fiber laser of normal linearity structure include wavelength selective filters (or tunable optic filter), Gain media (such as EDFA or SOA), one or more Polarization Controller, and an output port, make For reference paper ....

Utility model content

The purpose of this utility model is to provide the low cost tunable optical source with rotating disk and multiaspect reflecting element Structure, with the problem solving to propose in above-mentioned background technology

The present invention proposes a kind of low cost tunable optical source structure with rotating disk and multiaspect reflecting element, including One rotating disk, if described rotating disk includes N number of independent adjustment and installation so that from optical fiber collimator reflection light Dry reflecting element, several described reflecting elements individually adjust and install；One servomotor, for turning Dynamic rotating disk；One diffraction element, for being scattering into different colors by incident ray；And one gain media.

Gain media can be a semiconductor optical amplifier (SOA) or an erbium-doped fiber amplifier (EDFA), run in annular or linear structure, to become optical fiber laser.Additionally, M synchronization Branch repeats filter construction, carries not increasing in the case of reflecting element quantity does not the most use higher speed motor High tuning rate of scanning.

According to the present invention, tunable optical source by a rotating disk, a diffraction element (such as diffracting object grating) and One SOA or EDFA composition, its turntable is rotated by common commercially available servomotor (or motor), And including N number of independent adjustment and installation so that from the reflecting element of optical fiber collimator reflection light；Diffraction unit Part receives the light from reflecting element；SOA or EDFA is as gain media.In multiple branching construction, Before M collimator and diffraction element are arranged on rotating disk with accurate distance, improve scanning by coefficient M Frequency.In each time interval, only M branch of use one is filtered to gain media feedback Light.Total rate of scanning is SF=NxMxS/60, and unit is Hz, and in formula, S is the rotating speed of motor, unit For rpm.Utilize typical servo motor and 60 reflecting elements and 2 branches knot that rotating speed is 10,000rpm Structure, we can obtain the rate of scanning of 20KHz and the wavelength tuning range of 120nm easily.If Selecting the tuning range of 80nm, the quantity of branch can increase to 3, and rate of scanning will for 30KHz, Quantity and the motor speed of reflecting element keeps constant simultaneously.

The beneficial effects of the utility model are: this utility model low cost, utilize multiple branching construction to improve scanning frequency Rate, reduces the quantity of reflecting element in the case of not reducing rate of scanning, is not increasing reflecting element quantity In the case of improve rate of scanning, in the case of not improving motor speed improve rate of scanning.

Accompanying drawing explanation

It is more fully understood that the present invention, with reference to described further below and accompanying drawing, wherein:

Fig. 1 a is the view of the tunable optical source in the loop configuration showing optical fiber laser, and Fig. 1 b For showing the view of the tunable optical source in the linear structure of optical fiber laser.

Fig. 2 is the extended view of the rotating disk comprising reflecting element.

Fig. 3 is the compressed view of the rotating disk comprising reflecting element.

Fig. 4 is the view showing the tunable optic filter in multiple branching construction.

Fig. 5 is the view of the time domain output signal of the swept laser source showing each branch and combinations thereof body.

Fig. 6 is the view showing second embodiment, and wherein chip gain was directly forced before rotating disk.

Detailed description of the invention

With reference to institute's accompanying drawing, the preferred embodiments of the present invention are used for illustrating in this article, and without limitation.

With reference to Fig. 1, figure showing, the low cost in loop configuration (a) and linear structure (b) is tunable and swashs One embodiment of light device.Can be single-mode fiber (SMF) or polarization maintaining optical fibre (PMF) or any other The optical fiber 27 of type fiber is connected on collimator 22, and place with the reflecting element 15 of rotating disk 20 away from Place from L1 (25).The details of rotating disk and reflecting element 15 will illustrate in figs. 2 and 3.Diffraction Element, such as diffracting object grating, be placed on reflecting element 15 apart from the place of L2 (26).Optical fiber 27, The composition of collimator 22 and diffraction element 21 defines single branching filter 30.Optical fiber 27 is by Fig. 1 (a) In circulator 101 be connected in a loop configuration, and utilize optical fiber 90 and Polarization Controller 91 even Receiving on gain media 102, gain media 102 can be SOA or EDFA.Bonder 103 is by part Laser power takes optical fiber 104 to.Optical fiber 90 is utilized to be linked together by parts.Fig. 1 (b) shows linearly Structure.In this case, tunable optic filter is connected on gain media 102, and output laser takes From optical fiber 104.Light polarization is adjusted by Polarization Controller 91, to obtain optimum performance.

With reference to Fig. 2, figure shows and is made up of two independent parts i.e. base portion 10 and holder part 12 An embodiment of rotating disk.Base can manufacture with holder part together with single part, but respectively Manufacture more accurately and be easier to, it is also possible to reduce manufacturing cost.The two part is all made up of aluminum or rustless steel. The core 11 of basal disc 10 is fixed on the axle 14 of servomotor 13.It is even possible that use other types Motor, but servomotor is preferably to select.

Support 12 utilizes six screws to be fixed on base 10 by hole 16.Support 12 and base 10 are tightly Be fixed together into rotating disk 20 (Fig. 3), reflecting element 15 wherein will be installed.The radius of rotating disk 20 by The size of reflecting element 15 and sum determine.Reflecting element can be the mirror of pre-cut, and utilizes epoxy Resin is equidistant to be fixed on support 12.Each reflecting element can the most individually adjust. Contrary with polygon prism, base 10 and support 12 need not manufacture with accurate angle and press polished surface, So significantly reduce manufacturing cost.

Referring now to Fig. 4, figure illustrates the concept of multiple branching construction.Partially illustrate rotating disk 20.Rotating disk In 20, the angle between two continuous reflection elements 15 is β (29), and adopts and select in a way, The i.e. sum of reflecting element is integer: N=2 π/β.

Second branch uses the mode identical with first branch to install.M branch's filter generally can be installed Ripple device.Optical fiber 27 from all branches is combined into a combiner 23, its can be a bonder or Mx1 photoswitch.In each time interval, only one of which input optical fibre 27 is connected on output optical fibre 28. Photoswitch 23 should synchronize with rotating disk 20.On the circulator 101 now output optical fibre 28 being connected in Fig. 1. 1.

Fig. 5 (a) shows that wherein T is due to the output frequency of swept light source in the time domain that single branch causes Time interval through two continuous reflection elements.T is by between rotating speed and two continuous reflection elements of motor Physical distance determines.For the 2nd and m-th branch, (b) part and (c) in Fig. 5 show phase Same result.Shown in composite signal such as Fig. 5 (d) of all branches after combiner 23.Now will scanning frequency Rate is multiplied by coefficient M.Should correctly select the angle between two continuous branched alphas (in Fig. 4 24), in case letter Number overlap.For M branched structure, determining angle [alpha] (24) by α=n β+β/M, in formula, n is Integer.The quantity of branch M additionally depends on the tuning range of swept light source.

Tuning range is the biggest, and the pulse in Fig. 5 is the widest, in turn reduces the maximum quantity of branch, maximum (M) 2 π/N/ Δ θ=β/Δ θ, in formula, Δ θ is the anglec of rotation of radiated element correspondence tuning range. Total rate of scanning is SF=NxMxS/60, and unit is Hz, and in formula, S is the rotating speed of motor, and unit is rpm.

Fig. 6 shows second embodiment, and wherein the rays pass through lens 111 of chip gain 110 is calibrated to The reflecting element 15 of rotating disk 20.Then, light is returned from diffraction element 21 diffraction, again focuses on gain On chip.By rotating rotating disk 20, use the mode identical with embodiment before can centering cardiac wave progress Row tuning.Multiple branching construction can also be utilized tunable swept light source and identical or different centre wavelength group Close.

Claims (3)

1. a low cost tunable optical source structure with rotating disk and multiaspect reflecting element, it is characterised in that Including a rotating disk, described rotating disk includes N number of independent adjustment and installation so that from optical fiber collimator reflection light Several reflecting elements, several described reflecting elements individually adjust and install；One servomotor, is used for Rotate rotating disk；One diffraction element, for being scattering into different colors by incident ray；And one gain is situated between Matter.

The low cost tunable optical source knot with rotating disk and multiaspect reflecting element the most according to claim 1 Structure, it is characterised in that described gain media is semiconductor optical amplifier or erbium-doped fiber amplifier.

The low cost tunable optical source knot with rotating disk and multiaspect reflecting element the most according to claim 1 Structure, it is characterised in that described rotating disk includes a single metalwork and two metalworks separated.