CN205263362U - Fiber optic coupling module - Google Patents

Abstract

The utility model discloses a fiber optic coupling module belongs to the optical components in the active optical cable, and there are shortcomings such as the module volume is great, receiving and dispatching port quantity is limited, technology complicacy in the active optical cable among the prior art, the utility model provides a fiber optic coupling module to 45 rectangular prism and microlens array and light detector coupling are passed through with a planar end surface fiber array to beveled tip face fiber array and laser array coupling, and will launch subassembly and the integration of receipt subassembly in a module, and modular structure compactness, interconnection density are high, and have simple process's advantage.

Description

A kind of fiber coupling module

Technical field

The utility model belongs to the optical module in active optical cable, specifically relates to a kind of highThe multimode fibre coupling module of density.

Background technology

Along with the arriving of large data age, Streaming Media, social networks and cloud computing equiband consumeType the Internet, applications obtains flourish, as the scale of the data center of its support also more and moreBetween the rack of data center inside, need a large amount of exchanges data, to interconnect speed and close greatly,Degree proposes higher requirement. Traditional electronic interconnection technology can not meet the need at new types of data centerAsk, generally adopt at present active optical cable (AOC) to carry out the interconnection between rack. In high-performanceIn the system such as computer, mass storage, also often adopt active optical cable, to realize equipmentBetween high-speed interconnect.

Active optical cable is a kind of integrated optical-electric module, and it is by a pair of optical fiber receiver-transmitter module and oneOptical fiber ribbon cable composition, as shown in Figure 1. At A end, data are input as electronic signal, pass throughElectric light transition components converts electrical signals to the optical signal of specific wavelength, and optical signal is through optical cable transmissionArrive after B end, then be converted to electronic signal output by electric light transition components.

Optical fiber receiver-transmitter module comprises that semiconductor laser array-fiber array coupling assembly (sends outPenetrate assembly), fiber array-photodetector array coupling assembly (being receiving unit), and swashThe drive circuit of light device array and photodetector array. Large-scale data center is badly in need of highdensity mutualThe technology of company, therefore needs the each assembly in optical fiber receiver-transmitter module with integrated of the compactest formCome.

Current active optical cable technology mainly contains three classes: the first kind is by emitting module and reception groupPart is packaged into independently module separately, the twice that the module cumulative volume of this scheme is Integrated Solution.Equations of The Second Kind is that semiconductor laser and photo-detector are lined up to a linear array, carries out with fiber arrayBe coupled and be encapsulated as an integration module, the shortcoming of this scheme is, when limiting the width of moduleTime, the parallel transmitting-receiving port number that can hold is limited. The 3rd class is by semiconductor laser and lightDetector is lined up the array of a 2 × N, with two fiber arrays respectively with laser array andPhotodetector array coupling, is packaged into an integrated transceiver module, and this scheme can be heldMaximum parallel transmitting-receiving port numbers.

To above-mentioned the 3rd type optical fiber transceiver module, the science religion report of Keria Electronic Communication InstA kind of technical scheme, they are the 2-D optical fibre array of 2 × N port, end face polishingInclined-plane at 45 °, by being mounted on microlens array and the laser array of fiber array lower surfaceBe coupled with photodetector array. This technical scheme has non-to the manufacture craft of fiber arrayNormal high requirement, because to 2-D optical fibre array, is difficult to ensure the positioning accurate between two row's optical fiberDegree.

In view of above situation, existing active optical cable exists that module volume is large, transmitting-receiving port numberMeasure the shortcomings such as limited, complex process.

Utility model content

The shortcomings such as, transmitting-receiving port limited amount large for prior art volume, complex process,The utility model proposes a kind of novel fiber coupling module, be intended to solve the problem of above technology.

For achieving the above object, the utility model provides a kind of fiber coupling module, its featureBe, described fiber coupling module comprises: the fiber array of laser array, 45 ° of end faces,The joints of optical fibre, planar end surface fiber array, microlens array, right angle prism, photo-detectorArray and and substrate;

Described laser array and described photodetector array are arranged in described substrate; Described micro-Lens arra sticks on the incident right angle face of described right angle prism; Described 45 ° of end facesFiber array and described planar end surface fiber array are pasted together back-to-back, described 45 ° of end facesThe tail optical fiber of fiber array and the tail optical fiber of described planar end surface fiber array all penetrate described optical fiber and connectConnect in device;

Described laser array and described 45 ° of end face fiber array direct-couplings, form this lightEmitting module in fine coupling module;

Described planar end surface fiber array and described photodetector array are by described right angle prismBe coupled with described microlens array, form the receiving unit of this fiber coupling module.

Preferably, described laser array is VCSEL laser array;

Preferably, the described joints of optical fibre are 2 × N core MPO joints of optical fibre;

Preferably, described microlens array is the microlens array that polycrystalline silicon material is made.

In general, the above technical scheme of conceiving by the utility model, with prior artCompare,, can obtain following technology beneficial effect:

(1) the utility model proposes a kind of novel fiber coupling module, with 45 ° of angled end-face lightThe coupling of fibre array and laser array, with a planar end surface fiber array by right-angle prism and micro-Lens arra and photo-detector coupling, and emitting module and receiving unit are integrated in to a moduleIn, modular structure compactness, interconnection density are high, and have the simple advantage of technique.

Brief description of the drawings

Fig. 1 is typical active optical cable structural representation;

Fig. 2 is high-density optical-fiber coupling module structural representation described in the utility model;

Fig. 3 is the three-view diagram of 45 ° of end face fiber arrays, (a) is front view, is (b) top view,(c) be left view;

Fig. 4 is the three-view diagram of planar end surface fiber array, (a) is front view, is (b) top view,(c) be left view;

Fig. 5 is the light path schematic diagram of fiber end face to photo-detector end face;

Fig. 6 is the three-view diagram of microlens array, (a) is front view, is (b) top view, (c)For left view.

Detailed description of the invention

In order to make the purpose of this utility model, technical scheme and advantage clearer, belowBy reference to the accompanying drawings and embodiment, the utility model is further elaborated. Should be appreciated thatSpecific embodiment described herein is only in order to explain the utility model, and is not used in and limits thisUtility model.

Below in conjunction with accompanying drawing, the utility model is described further:

As shown in Figure 2, high-density optical-fiber transceiver module described in the utility model comprises VCSELThe fiber array 2 of 1,45 ° of end faces of laser array, 2 × N core MPO joints of optical fibre 3,Planar end surface fiber array 4, microlens array 5, right angle prism 6, photodetector array 7With with ceramic bases 8. Wherein laser array 1 and photodetector array 7 are with high-precision subsidesSheet machine is mounted in same ceramic bases 8; Microlens array 5 sticks on right angle prism 6Incident right angle face on; The fiber array 2 of 45 ° of end faces and planar end surface fiber array 4 are with glueBe pasted together back-to-back, tail optical fiber all penetrates in the MPO joints of optical fibre 3, makes and can plugThe optical fiber receiver-transmitter module of formula.

1 and 45 ° of end face fiber arrays 2 of VCSEL laser array are closely coupling directly,Form the emitting module in this optical fiber receiver-transmitter module. Laser array send straight up swashLight beam, in the angled end-face generation total reflection of 45 ° of end face fiber arrays, is folded to horizontal direction and existsIn optical fiber, transmit. In order to ensure the coupling efficiency of light beam, the optical fiber laser array of should trying one's bestSurface, therefore, making when fiber array, allow optical fiber give prominence to positioning substrate certain length, asShown in Fig. 3.

Planar end surface fiber array 4 passes through right angle prism 6 and lenticule with photodetector array 7Array 5 is coupled, and forms the receiving unit of this optical fiber receiver-transmitter module. Planar end surface fiber array4 as shown in Figure 4, from the light beam along continuous straight runs transmission of optical fiber output, through right angle prism 6Inclined-plane reflection after, be incident on photodetector array 7. What send due to optical fiber is to disperseLight beam in order to ensure coupling efficiency, mounts microlens array on the incident right angle of prism face5。

In assembling process, first by adjustable stand for precision optics mechanics, by laser array 1 and lightFibre array 2 is adjusted to accurate aligning fixing. 45 ° of end face fiber arrays 2 pasting back-to-backAnd the positioning precision between planar end surface fiber array 4 does not have technique to ensure, at optical fiberUnder the prerequisite that array 2 is accurately aimed at laser array 1, fiber array 4 and photo-detector battle arrayNon-accurate aligning between row 7, can be by regulating the inclination angle of prism 6 to correct the two itBetween alignment error.

From fiber array 4 through microlens array 5 and prism 6 light to photodetector array 7Bundle communication process, as shown in Figure 5. Because fiber end face is placed on lenticular focal plane, enterPenetrate is directional light on photo-detector, and beam diameter W depends on the numerical aperture NA of optical fiberWith lenticular focal distance f, suc as formula (1).

W＝2f·NA(1)

Microlens array 5 as shown in Figure 6, be generally by microelectronic technique on base materialThe single-spherical lens array that etching forms, focal length of lens f depend on sphere radius of curvature R andThe refractive index n of base material, suc as formula (2); The camber H of lens sphere depends on lens apertureD and sphere curvature radius R, suc as formula (3).

$f=\frac{R}{n-1}---\left(2\right)$

$H=R-\sqrt{R^2-\frac{D^2}{4}}---\left(3\right)$

From formula (2), the in the situation that of given base material refractive index n, the focal length of lensF is less, and sphere curvature radius R is less; And from formula (3), in given lens apertureIn the situation of D, lens radius of curvature R is less, and sphere camber H is larger. Form thusReduce → H of reduce → R of size relationship: f increases.

According to formula (1), spot size W is directly proportional to the focal distance f of lens, and high in order to realizeThe interconnection of density, requires optical fiber spacing the smaller the better (being generally 250 microns), therefore restrictionLens aperture D and spot size W, then require focal length of lens f the smaller the better. According to upperState size relationship, this can cause the camber of lens sphere to increase.

Because microlens array generally forms with Microelectronic etching processes, sphere camber HCan not accomplish that very large, actual technological ability contradicts with the demand of high density interconnect. In investigationState formula (2), corresponding identical focal distance f (the spot size W corresponding identical according to formula (1)),In the time that the refractive index n of lenticule base material increases, sphere curvature radius R also increases, therebyReduce the requirement to lens sphere camber H.

Microlens array is made with quartz glass or polysilicon conventionally, in the common work of active optical cable850 nano wavebands of doing, the refractive index of quartz glass is 1.45, the refractive index of polysilicon is3.44. According to formula (2), corresponding same spot size is the focal length of lens, adopts polysilicon materialThe microlens array that material is made, than silica glass material, the sphere curvature radius of lens increases4.4 times, sphere camber can significantly reduce.

Those skilled in the art will readily understand, the foregoing is only better reality of the present utility modelExecute example, not in order to limit the utility model, all in spirit of the present utility model and principleWithin do any amendment, be equal to and replace and improvement etc., all should be included in of the present utility modelWithin protection domain.

Claims (4)

1. a fiber coupling module, is characterized in that, described fiber coupling module comprises:The fiber array of laser array, 45 ° of end faces, the joints of optical fibre, planar end surface fiber array,Microlens array, right angle prism, photodetector array and substrate;

Described laser array and described photodetector array are arranged in described substrate; Described micro-Lens arra sticks on the incident right angle face of described right angle prism; Described 45 ° of end facesFiber array and described planar end surface fiber array are pasted together back-to-back, described 45 ° of end facesThe tail optical fiber of fiber array and the tail optical fiber of described planar end surface fiber array all penetrate described optical fiber and connectConnect in device;

Described laser array and described 45 ° of end face fiber array direct-couplings, form this lightEmitting module in fine coupling module;

Described planar end surface fiber array and described photodetector array are by described right angle prismBe coupled with described microlens array, form the receiving unit of this fiber coupling module.

2. fiber coupling module as claimed in claim 1, is characterized in that, described laserArray is VCSEL laser array.

3. fiber coupling module as claimed in claim 1, is characterized in that, described optical fiberConnector is 2 × N core MPO joints of optical fibre.

4. fiber coupling module as claimed in claim 1, is characterized in that, described micro-Lens array is the microlens array that polycrystalline silicon material is made.