WO2017096749A1 - 一种光模块 - Google Patents

一种光模块 Download PDF

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Publication number
WO2017096749A1
WO2017096749A1 PCT/CN2016/080258 CN2016080258W WO2017096749A1 WO 2017096749 A1 WO2017096749 A1 WO 2017096749A1 CN 2016080258 W CN2016080258 W CN 2016080258W WO 2017096749 A1 WO2017096749 A1 WO 2017096749A1
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WIPO (PCT)
Prior art keywords
positioning mark
laser
optical module
filter
curved surface
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PCT/CN2016/080258
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English (en)
French (fr)
Inventor
李杨洁
孙春雷
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Hisense Broadband Multimedia Technology Co Ltd
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Hisense Broadband Multimedia Technology Co Ltd
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Publication of WO2017096749A1 publication Critical patent/WO2017096749A1/zh
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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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4213—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being polarisation selective optical elements
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
    • G02B6/422—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements
    • G02B6/4221—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements involving a visual detection of the position of the elements, e.g. by using a microscope or a camera
    • G02B6/4224—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements involving a visual detection of the position of the elements, e.g. by using a microscope or a camera using visual alignment markings, e.g. index methods

Definitions

  • the present invention relates to the field of optical communication technologies, and in particular, to an optical module.
  • An optical module is an integrated module that can convert an optical signal into an electrical signal and convert the electrical signal into an optical signal, and is an important device in an optical communication system.
  • optical fiber communication systems have proposed miniaturization requirements for optical modes.
  • it has been proposed to change the original horizontally placed laser to a tilted position when the optical module is packaged, as shown in FIG.
  • the incident angle of the laser emitted light will be greater than 45° with respect to the filter, which is affected by the inherent polarization characteristics of the filter.
  • the passband range of the filter will be short-waved accordingly.
  • Direction drift Compared with the normal temperature, the wavelength of the light emitted by the laser will drift to the long wavelength direction at a high temperature.
  • the combination of the above two factors causes the wavelength of a part of the emitted light emitted by the laser to drift out of the passband range of the filter, resulting in a decrease in the intensity of the transmitted filter, causing the optical power of the optical module to drop.
  • the optical module may have a problem of optical power drop in a high temperature environment.
  • an embodiment of the present invention provides an optical module to reduce the optical power drop caused by tilting the laser, and to improve the optical power of the optical module.
  • an optical module including a square tube body, a laser, and a circle a filter inside the tube body
  • the circular square tube body is provided with a first positioning mark
  • the radial direction of the first positioning mark is the polarization direction of the filter
  • the laser is provided with a second Positioning the mark
  • the radial direction of the second positioning mark is the polarization direction of the laser
  • the first positioning mark is aligned with the second positioning mark.
  • the first positioning mark disposed on the circular square tube can position the polarization direction of the filter
  • the second positioning mark disposed on the laser can position the polarization direction of the laser, so when the first positioning When the mark and the second positioning mark are aligned, the polarization direction of the laser is the same as the polarization direction of the filter.
  • the intensity of the laser emitting light transmitting filter will be maximized, so that it can be a certain degree.
  • the optical power drop caused by tilting the laser is lowered, and the optical power of the optical module is increased.
  • Figure 1 is a comparison of the horizontal placement and the inclined placement of the laser
  • Figure 2 is a schematic diagram of the description of Marius's law
  • FIG. 3 is a schematic exploded view of an optical module according to an embodiment of the present invention.
  • FIG. 4 is a partial schematic structural view of the optical module shown in FIG. 3;
  • FIG. 5 is an exploded perspective view showing a partial structure of the optical module shown in FIG. 4;
  • Figure 6 is a cross-sectional view showing a partial structure of the optical module shown in Figure 4.
  • FIG. 7 is a schematic diagram of calculation of an incident angle of a laser emitting light in the prior art
  • FIG. 8 is a schematic view showing a variation of a band pass range of a filter according to an incident angle of a laser emitted light in the prior art
  • FIG. 9 is a schematic diagram of calculation of an incident angle of a laser emitting light according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural view of a laser
  • FIG. 11 is an exploded perspective view showing a partial structure of another optical module according to an embodiment of the present invention.
  • Polarization of light In the field of electromagnetic waves, a wave whose vibration direction and wave propagation direction are the same is called a longitudinal wave, and a wave whose vibration direction and propagation direction are perpendicular to each other is called a transverse wave.
  • a longitudinal wave the motion in all planes through its direction of propagation is the same, and none of the planes exhibits particularity with any other plane, which is often referred to as the symmetry of the direction of vibration of the wave.
  • the transverse wave the plane passing through its propagation direction and containing the vibration vector is very different from other planes that do not contain the vibration vector. This is usually called the vibration direction of the wave has no symmetry to the direction of propagation. This phenomenon is also Called polarization.
  • Light is an electromagnetic wave and belongs to a transverse wave. Therefore, the asymmetry of the direction of vibration of the light with respect to the direction of propagation is called the polarization of light.
  • the intensity of the polarized light obtained by the polarizer P1 is I0
  • FIG. 3 is a schematic exploded view of an optical module according to an embodiment of the present invention
  • FIG. 4 is a partial structural schematic view thereof
  • FIG. 5 is an exploded perspective view showing a partial structure thereof
  • FIG. 6 is a partial structural view thereof. Cutaway view.
  • the optical module provided by the embodiment of the present invention includes a circular square body 201, a filter 202 disposed inside the square tubular body 201, and a laser 203.
  • the circular square body 201 is provided with a first positioning mark 201a.
  • the radial direction of the first positioning mark 201a ie, the direction indicated by the straight line L1 in the figure
  • the laser 203 A second positioning mark 203a is disposed thereon
  • the radial direction of the second positioning mark 203a ie, the direction indicated by the straight line L2 in the drawing
  • the first positioning mark 201a is aligned with the second positioning mark 203a.
  • the number of the first positioning mark 201a and the second positioning mark 203a may be one or two.
  • the laser 203 is disposed obliquely with respect to the rectangular tubular body 201.
  • the optical module may include the optical module housing 10 in addition to the above-mentioned square tubular body 201, the filter 202, and the laser 203.
  • the printed circuit board (PCB) 30, the detector 204, the pigtail 205, the reflective device 206, and the like are disposed inside the optical module housing 10.
  • the laser 203 functions to emit a first optical signal into the pigtail 205
  • the detector 204 functions to receive a second optical signal from the pigtail 205
  • the filter 202 functions as a transmission laser 203.
  • the first optical signal causes the first optical signal to enter the pigtail 205, and the second optical signal received from the pigtail 205 is reflected to the reflective device 206 such that the second optical signal is ultimately reflected by the reflective device 206 Detector 204 receives. It can be seen that the filter 202 is arranged to distinguish the first optical signal emitted by the laser 203 from the outside. The second optical signal entering the pigtail 205.
  • optical module shown in FIG. 3 is only an exemplary description given by the embodiment of the present invention, and the present invention is not limited thereto.
  • the filter is inclined at an angle of 45° to the horizontal line.
  • the angle between the central light column of the laser emitting light and the horizontal line is 3.7°, and the angle between the upper and lower edge light columns and the central light column are both 10°, as shown in Fig. 7, it is easy to conclude from the triangle outer angle theorem that the incident angle of the emitted light of the laser is between 38.7° and 58.7°.
  • the bandpass range of the filter will continue to drift in the short-wave direction. Referring to Fig.
  • the band pass range of the filter is the range indicated by the rectangle A
  • the band pass range of the filter is The range indicated by the rectangle B after the short-wave direction drift, and so on...
  • the band pass range of the filter is a range indicated by the rectangle E. It is easy to understand that the wavelength range of the emitted light of the laser is a fixed range, for example, 180 nm to 290 nm.
  • the emitted light having an incident angle of 38.7° can be transmitted to the tail through the filter.
  • Fiber, and only part of the emitted light with an incident angle of 40° can pass through the filter.
  • the emission of the incident angle of 45° can pass through the filter less... for the incident angle of 58.7
  • the emitted light of ° may not pass through the filter at all.
  • the wavelength of the emitted light will drift to the long-wave direction, which further worsens the optical power drop.
  • the filter 202 is preferably placed at an angle of 45° to 48.7° (excluding 45°).
  • the optical module provided by the embodiment of the present invention can Increasing the emitted light passing through the filter, thereby increasing the emitted light power of the optical module, improving the inherent polarization characteristics of the filter and the optical power drop caused by the high temperature.
  • the filter tilting 48.7° as an example for description, referring to FIG. 9, when the filter is tilted by 48.7°, the incident angle of the emitted light of the laser 203 is 35° to 55°, and the laser emits light in the prior art.
  • the angle of incidence is 38.7 ° ⁇ 58.7 °, obviously 35 °
  • the range of ⁇ 55° is less than the range of 38.7° to 58.7°.
  • FIG. 10 is a schematic structural view of the laser 203.
  • a square groove 2033 and two triangular notches 2032 are disposed on the outer curved surface of the base 2031 of the laser 203. This is for the convenience of the person skilled in the art to characterize the laser 203.
  • the direction of polarization is set.
  • the straight line formed by the two triangular notches 2032 is the polarization direction of the laser 203. Therefore, in the embodiment of the present invention, the triangular notch 2032 on the outer curved surface of the base 2031 of the laser 203 may be preferably used as the second positioning mark 203a.
  • the first positioning mark 201a may be a line or a curved surface formed by coating the outer curved surface of the interface of the square tubular body 201 with a paint.
  • the first positioning mark 201a may be a plane, a curved surface, a groove, or a notch formed by cutting the outer curved surface of the interface of the square tubular body 201.
  • the first positioning mark 201a may be any other form of the mark, which is not specifically limited in the embodiment of the present invention.
  • first positioning mark 201a and the second positioning mark 203a may be designed to be the same size.
  • the size mentioned here specifies the width of the bit mark. It is easy to understand that after the first positioning mark 201a and the second positioning mark 203a are designed to have the same width, when assembling, the first positioning mark 201a and the second positioning mark 203a are ensured to be completely aligned, and then the laser 203 and the square tube body 201 are assembled. It is ensured that the polarization direction of the laser 203 coincides with the polarization direction of the filter 202 built in the square tubular body 201.
  • the dimensions of the first positioning mark 201a and the second positioning mark 203a are inconsistent, when assembling, the center line of the two is aligned, and then the laser 203 and the square tube body 201 are assembled. It is ensured that the polarization direction of the laser 203 coincides with the polarization direction of the filter 202 built in the square tubular body 201.
  • a third positioning mark 201b may be added to the square tubular body 201.
  • the radial direction of the third positioning mark 201b ie, the direction indicated by the straight line L3 is perpendicular to the polarization direction of the filter 202, and the third The alignment mark 201b is aligned with the square groove 2033 on the outer curved surface of the base 2031 of the laser 203.
  • the third positioning mark 201b may be a plane, a curved surface, a groove, or a notch formed by cutting the outer curved surface of the interface of the square tubular body 201.
  • the third positioning mark 201b and the square groove 2033 can be designed to be the same size for ease of assembly.
  • the first positioning mark disposed on the circular square tube can position the polarization direction of the filter
  • the second positioning mark disposed on the laser can position the polarization direction of the laser, so when the first positioning When the mark and the second positioning mark are aligned, the polarization direction of the laser is the same as the polarization direction of the filter.
  • the intensity of the laser emitting light transmitting filter will be maximized, so that it can be a certain degree.
  • the optical power drop caused by tilting the laser is lowered, and the optical power of the optical module is increased.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Semiconductor Lasers (AREA)

Abstract

一种光模块，包括圆方管体（201）、激光器（203）和设置于圆方管体（201）内部的滤光片（202）。圆方管体（201）上设置有第一定位标记（201a），第一定位标记（201a）所在径向为滤光片（202）的偏振方向。激光器（203）上设置有第二定位标记（203a），第二定位标记（203a）所在径向为激光器（203）的偏振方向。第一定位标记（201a）与第二定位标记（203a）对齐。该结构有助于减小损耗。

Description

一种光模块
本申请要求于2015年12月10日提交中国专利局、申请号为201510917447.X、发明名称为“一种光模块”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及光通信技术领域，尤其涉及一种光模块。
背景技术
光模块是一种可以将光信号转换成电信号和将电信号转换成光信号的集成模块，是光通信系统中的重要器件。
随着光纤通信技术的发展，光纤通信系统对光模提出了小型化的要求。为减小光模块的体积，有人提出在封装光模块时将原先水平放置的激光器改为倾斜放置，如图1所示。将激光器倾斜放置后，相对滤光片，激光器发射光的入射角将大于45°，受到滤光片固有偏振特性的影响，入射角增大后，滤光片的通带范围会相应地往短波方向漂移。而相较于常温，高温时激光器发射光的波长又会向长波方向漂移。以上两种因素综合作用，会使激光器发射出的一部分发射光的波长漂出滤光片的通带范围，导致透过滤光片的光强下降，致使光模块的发射光功率跌落。
综上，现有技术中，光模块在高温环境下会出现光功率跌落的问题。
发明内容
为此，本发明的实施例提供一种光模块，以缓减将激光器倾斜放置所引起的光功率跌落，能够提高光模块的发射光功率。
为达到上述目的，本发明的实施例采用如下技术方案：
提供一种光模块，包括圆方管体、激光器以及设置于所述圆方 管体内部的滤光片，所述圆方管体上设置有第一定位标记，所述第一定位标记所在的径向为所述滤光片的偏振方向，所述激光器上设置有第二定位标记，所述第二定位标记所在的径向为所述激光器的偏振方向，所述第一定位标记与所述第二定位标记对齐。
本发明实施例提供的光模块中，圆方管体上设置的第一定位标记能够定位滤光片的偏振方向，激光器上设置的第二定位标记能够定位激光器的偏振方向，因此当第一定位标记和第二定位标记对齐时，激光器的偏振方向即与滤光片的偏振方向一致，根据马吕斯定律，激光器发射光透过滤光片的光强将达到最大，因此，可在一定程度上缓减将激光器倾斜放置所引起的光功率跌落，提高光模块的发射光功率。
附图说明
图1为激光器水平放置与倾斜放置的对比图；
图2为马吕斯定律说明示意图；
图3为本发明实施例提供的一种光模块的分解结构示意图；
图4为图3所示光模块的局部结构示意图；
图5为图4所示光模块局部结构的分解示意图；
图6为图4所示光模块局部结构的剖视图；
图7为现有技术中激光器发射光的入射角计算示意图；
图8为现有技术中滤光片的带通范围随激光器发射光入射角的变化示意图；
图9为本发明实施例中激光器发射光的入射角计算示意图；
图10为激光器的结构示意图；
图11为本发明实施例提供的另一种光模块的局部结构的分解示意图。
具体实施方式
为了便于理解本发明，首先对光的偏振及马吕斯定律进行简要介绍如下：
(1)光的偏振：在电磁波领域中，振动方向和波的传播方向相同的波称为纵波，振动方向和传播方向相互垂直的波称为横波。对纵波而言，通过其传播方向的所有平面内的运动情况都相同，其中没有一个平面显示出与其他任何平面的特殊性，这通常称为波的振动方向对传播方向具有对称性。而对横波而言，通过其传播方向且包含振动矢量的平面和其他不包含振动矢量的平面有很大的区别，这通常称为波的振动方向对传播方向没有对称性，这一现象也被称为偏振。光是一种电磁波，且属于横波，因此光的振动方向对于传播方向的不对称性即被称为光的偏振。
(2)马吕斯定律：请参考图2，图中P1和P2代表两块偏振片，其中偏振片P1为起偏器，用于从自然光获得偏振光，偏振片P2为检偏器，用于检验偏振片P1产生的偏振光。
假设偏振片P2的偏振方向与偏振片P1的偏振方向互成角度θ，起偏器P1获得的偏振光的光强为I0，则透过检偏器P2后，透射光的光强为I＝I0×cos2θ，该式所表达的偏振光通过检偏器后的透射光强度随θ角变化的这种规律，叫做马吕斯定律。容易得出，当θ＝0°时，即当偏振片P1与偏振片P2的偏振方向一致时，通过检偏器的透射光的强度最大。
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。其中，需要说明的是，为了便于清楚描述本发明实施例的技术方案，在本发明的实施例中，采用了“第一”、“第二”等字样以对功能和作用类似的相似项进行区分，应理解，“第一”、“第二”等字样并不对数量和执行次序进行限定。
图3所示为本发明实施例提供的一种光模块的分解结构示意图，图4所示为其局部结构示意图，图5所示其局部结构的分解示意图，图6所示为其局部结构的剖视图。
参见图3-6，本发明实施例提供的光模块包括：包括圆方管体201、设置于圆方管体内部201的滤光片202以及激光器203。
如图5所示，圆方管体201上设置有第一定位标记201a，第一定位标记201a所在的径向(即图中直线L1所示方向)为滤光片202的偏振方向，激光器203上设置有第二定位标记203a，第二定位标记203a所在的径向(即图中直线L2所示方向)为激光器203的偏振方向，第一定位标记201a与第二定位标记203a对齐。
根据图4及图5所示，容易得出，直线L1所示的滤光片202的偏振方向与直线L2所示的激光器203的偏振方向之间的夹角为0°，也即滤光片202的偏振方向与激光器203的偏振方向一致。根据前述马吕斯定律，激光器203发射光透过滤光片202的光强将达到最大，因而能够在一定程度上弥补由于将激光器203倾斜放置所引起的光模块的发射光功率跌落，提高光模块的发射光功率。
其中，第一定位标记201a和第二定位标记203a的个数可以为1个或2个。
更具体的，本发明实施例提供的光模块中，激光器203相对圆方管体201倾斜设置。
需要说明的是，本领域普通技术人员可以理解，本发明实施例提供的光模块，除包括上述的圆方管体201、滤光片202及激光器203之外，还可以包括光模块壳体10、设置于光模块壳体10内部的印刷电路板(Printed Circuit Board，PCB)30、探测器204、尾纤205、反射器件206等，具体可参见图3及图6。容易理解，激光器203的作用在于向尾纤205内发射第一光信号，探测器204的作用在于从尾纤205中接收第二光信号，而滤光片202的作用则在于透射激光器203发射的第一光信号，以使第一光信号进入尾纤205，以及，将从尾纤205中接收的第二光信号反射至反射器件206，以使第二光信号经过反射器件206的反射最终被探测器204接收。可见，设置滤光片202是为了区分激光器203发射的第一光信号与从外部传 入尾纤205的第二光信号。
当然，本领域普通技术人员可以理解，图3所示的光模块仅为本发明实施例给出的一种示例性说明，本发明并不限于此。
现有的光模块中，滤光片与水平线呈45°角倾斜放置，激光器的发射光的中心光柱与水平线之间的夹角为3.7°，上、下边缘光柱与中心光柱的夹角均为10°，具体如图7所示，则根据三角形外角定理容易得出，激光器的发射光的入射角在38.7°～58.7°之间。如前所述，受到滤光片固有偏振特性的影响，随着入射角的持续增大，滤光片的带通范围会持续向短波方向漂移。参见图8，假设对于入射角为38.7°的发射光，滤光片的带通范围为矩形A所示的范围，则对于入射角为40°的发射光，滤光片的带通范围为向短波方向漂移后的矩形B所示的范围，依次类推......，对于入射角为58.7°的发射光，滤光片的带通范围为矩形E所示的范围。容易理解，激光器的发射光的波长范围为一固定范围，例如180nm～290nm，假设矩形A的带通范围为180nm～290nm，则入射角为38.7°的发射光均可通过滤光片传至尾纤，而入射角为40°的发射光中只有部分可以通过滤光片，入射角为45°的发射光中可以通过滤光片的就更少......，对于入射角为58.7°的发射光，则可能全部无法通过滤光片。同时，高温时，发射光的波长又会向长波方向漂移，更加剧了光功率跌落。
为此，本发明实施例提供的光模块中，优选将滤光片202倾斜45°～48.7°放置(不包括45°)。
如此一来，滤光片202与水平线间的夹角即大于45°，激光器203的发射光的入射角将整体有所减小，因此相比现有技术，本发明实施例提供的光模块能够增加通过滤光片的发射光，进而提高光模块的发射光功率，改善滤光片固有偏振特性及高温所引起的光功率跌落。以滤光片倾斜48.7°放置为例进行说明，参考图9，当滤光片倾斜48.7°放置后，激光器203的发射光的入射角为35°～55°，而现有技术中激光器发射光的入射角为38.7°～58.7°，显然，35° ～55°的范围小于38.7°～58.7°的范围。
图10所示为激光器203的结构示意图，如图10所示，激光器203底座2031的外侧曲面上设置有一个方形凹槽2033及两个三角形缺口2032，这是本领域技术人员为便于表征激光器203的偏振方向而设置的。其中，两个三角形缺口2032构成的直线即为激光器203的偏振方向。因此，本发明实施例中，可优选激光器203底座2031的外侧曲面上的三角形缺口2032作为第二定位标记203a。
可选的，本发明实施例提供的光模块中，第一定位标记201a可以为使用涂料涂抹圆方管体201接口的外侧曲面所形成的线条或曲面。
优选的，本发明实施例提供的光模块中，第一定位标记201a可以为切割圆方管体201接口的外侧曲面所形成的平面、曲面、凹槽、或缺口。
当然，除上述列举形式之外，第一定位标记201a还可以是其他任何形式的标记，本发明实施例对此不作具体限定。
进一步的，为便于组装，可将第一定位标记201a与第二定位标记203a设计为相同尺寸。
需要说明的是，此处所说的尺寸指定位标记的宽度。容易理解，将第一定位标记201a与第二定位标记203a设计为相同宽度后，在组装时，保证第一定位标记201a与第二定位标记203a完全对齐后装配激光器203与圆方管体201，即可确保激光器203的偏振方向与内置于圆方管体201的滤光片202的偏振方向一致。
当然，本领域普通技术人员容易理解，若第一定位标记201a与第二定位标记203a的尺寸不一致，在组装时，保证二者的中心线对齐后装配激光器203与圆方管体201，即可确保激光器203的偏振方向与内置于圆方管体201的滤光片202的偏振方向一致。
进一步的，如图11所示，为降低组装难度，提高可操作性，进 而提高装配效，可在圆方管体201上增设第三定位标记201b，第三定位标记201b所在的径向(即直线L3所示的方向)垂直于滤光片202的偏振方向，第三定位标记201b与激光器203底座2031的外侧曲面上的方形凹槽2033对齐。
其中，第三定位标记201b可以为切割圆方管体201接口的外侧曲面所形成的平面、曲面、凹槽、或缺口。
优选的，为便于组装，可将第三定位标记201b与方形凹槽2033设计为相同尺寸。
本发明实施例提供的光模块中，圆方管体上设置的第一定位标记能够定位滤光片的偏振方向，激光器上设置的第二定位标记能够定位激光器的偏振方向，因此当第一定位标记和第二定位标记对齐时，激光器的偏振方向即与滤光片的偏振方向一致，根据马吕斯定律，激光器发射光透过滤光片的光强将达到最大，因此，可在一定程度上缓减将激光器倾斜放置所引起的光功率跌落，提高光模块的发射光功率。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (10)

  1. 一种光模块，其特征在于，包括圆方管体、激光器以及设置于所述圆方管体内部的滤光片，所述圆方管体上设置有第一定位标记，所述第一定位标记所在的径向为所述滤光片的偏振方向，所述激光器上设置有第二定位标记，所述第二定位标记所在的径向为所述激光器的偏振方向，所述第一定位标记与所述第二定位标记对齐。
  2. 根据权利要求1所述的光模块，其特征在于，所述激光器相对所述圆方管体倾斜设置。
  3. 根据权利要求1或2所述的光模块，其特征在于，所述第二定位标记为所述激光器底座的外侧曲面上的三角形缺口。
  4. 根据权利要求1-3任一项所述的光模块，其特征在于，所述滤光片倾斜设置，且所述滤光片与水平线的夹角大于45°且小于等于48.7°。
  5. 根据权利要求1-4任一项所述的光模块，其特征在于，所述第一定位标记为切割所述圆方管体接口的外侧曲面所形成的平面、曲面、凹槽、或缺口。
  6. 根据权利要求1-4任一项所述的光模块，其特征在于，所述第一定位标记为使用涂料涂抹所述圆方管体接口的外侧曲面所形成的线条或曲面。
  7. 根据权利要求5所述的光模块，其特征在于，所述第一定位标记与所述第二定位标记的尺寸一致。
  8. 根据权利要求1-7任一项所述的光模块，其特征在于，所述圆方管体上还设置有第三定位标记，所述第三定位标记所在的径向垂直于所述滤光片的偏振方向，所述第三定位标记与所述激光器底座的外侧曲面上的方形凹槽对齐。
  9. 根据权利要求8所述的光模块，其特征在于，所述第三定位标记为切割所述圆方管体接口的外侧曲面所形成的平面、曲面、凹槽、或缺口。
  10. 根据权利要求8或9所述的光模块，其特征在于，所述第三定位标记与所述方形凹槽的尺寸一致。
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