CN101995619A - Light communication module - Google Patents
Light communication module Download PDFInfo
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- CN101995619A CN101995619A CN2010102438065A CN201010243806A CN101995619A CN 101995619 A CN101995619 A CN 101995619A CN 2010102438065 A CN2010102438065 A CN 2010102438065A CN 201010243806 A CN201010243806 A CN 201010243806A CN 101995619 A CN101995619 A CN 101995619A
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- light
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- photo detector
- transmitting fiber
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Abstract
The present invention provides a light communication module, capable of reliably separating light based on one destined waveband when divergent light is emitted to a light-receiving element. The light-receiving element (3) is configured that its optical axis is intersected with an optical axis of a light guide fiber (2), a light filter (6) is configured to face to the light guide fiber (2), the light filter (6) reflects light emitted from the light guide fiber (2) to the light-receiving element, a wavelength separation element (11) through which the light of a destined waveband can passes is arranged between the light filter (6) and the light-receiving element (3), and an opening limitation part (15) through which the light of a central area of the divergent light emitted from the light guide fiber (2) can permeated is arranged on a light path between the light guide fiber (2) and the light-receiving element (3).
Description
Technical field
The present invention relates to a kind of and light transmitting fiber between receive radiative optical communications module, relate in particular to light that light transmitting fiber is sent and be directly incident on optical communications module in the photo detector with the state of diverging light.
Background technology
The structure of now known optical communications module is, and light transmitting fiber between receive emission light, transmitting and receiving signal.When optical communications module possesses the light transmitting fiber installation portion, also possess and receive light that light transmitting fiber sent and it is carried out the photo detector of opto-electronic conversion and luminous and make light incide fibre-optic light-emitting component.
Because can't on two side's same positions of fibre-optic optical axis, dispose photo detector and light-emitting component, so light-emitting component is configured on the fibre-optic optical axis usually, photo detector is configured to its optical axis and fibre-optic light shaft positive cross, by on fibre-optic optical axis, showing the optical filter of 45 degree configuration greatly, make photo detector receive the light that light transmitting fiber sends.
The light that light transmitting fiber sends is diverging light, as the general structure of optical communications module, for the light that light transmitting fiber is sent incides in the light accepting part, is provided with collimation lens mutually opposed to each other with optical filter, makes diverging light become directional light.
In addition, also known a kind of diverging light that under the situation that collimation lens is not set light transmitting fiber is sent incides the optical communications module of photo detector.In this case, on photo detector, be provided with globe lens etc., and by this globe lens gathered light on the sensitive surface of photo detector.Make diverging light be directly incident on photo detector by the way,, therefore can reduce the parts number, can also correspondingly realize miniaturization so do not need collimation lens.As this optical communications module, for example optical communications module of patent documentation 1 is just arranged.
Patent documentation 1:(Japan) spy opens the 2005-202156 communique
The light that light transmitting fiber sends is the light with a plurality of wavelength, when in optical communications module, a plurality of photo detector being set, be provided as the bandpass filter of wavelength separated element between light transmitting fiber and photo detector, this wavelength separated element only sees through the light of the designated band that receives at photo detector.Only see through the light of designated band in this bandpass filter, so each photo detector can receive the signal of appointment.Especially, when a plurality of wavelength are close, must come separated light accurately by bandpass filter.
But bandpass filter has the dependence to the angle of light degree.That is,, produce the phenomenon of the band discontinuity that sees through because of the variation of angle of light degree.When the diverging light that sends when light transmitting fiber incides bandpass filter, different in its incident angle of peripheral part of optical axis center and light.
The relative dispersion angle of the diverging light intensity that light transmitting fiber sends forms Gaussian distribution, and it is about 10 ° that diverging light intensity almost approaches 0 angle.That is the maximum angle difference that, produces in inciding the light of bandpass filter is about ± 10 °.If it is so big that incident angle differs, the wave band that sees through bandpass filter so also will differ greatly, separated light correctly, and the light that sees through contains the light of wide range of wavelengths, the problem of communication function therefore occurred reducing.
Summary of the invention
The present invention proposes in view of above-mentioned problem, its purpose be to provide a kind of can be when making diverging light incide photo detector according to each designated band optical communications module of separated light reliably.
In order to solve above-mentioned problem, optical communications module involved in the present invention possesses the photo detector that receives the light that light transmitting fiber sent and to the radiative light-emitting component of above-mentioned light transmitting fiber, and the diverging light that above-mentioned light transmitting fiber is sent incides above-mentioned photo detector, it is characterized in that
Above-mentioned photo detector is configured to optical axis and above-mentioned fibre-optic optical axis intersection, optical filter is configured to mutually opposed with above-mentioned light transmitting fiber, this optical filter reflects the light that above-mentioned light transmitting fiber sends and incides above-mentioned photo detector, configuration makes the wavelength separated element of the light transmission of designated band between above-mentioned optical filter and photo detector
On the light path between above-mentioned light transmitting fiber and the photo detector, has the opening restrictions that only makes the light transmission of central area from the diverging light that above-mentioned light transmitting fiber sends.
And the architectural feature of optical communications module involved in the present invention is that above-mentioned opening restrictions is made of the element with opening.
Also have, the architectural feature of optical communications module involved in the present invention is that the inner peripheral surface that is located at the opening of above-mentioned opening restrictions forms the cone-shaped that broadens towards the photo detector side from above-mentioned light transmitting fiber side.
And the architectural feature of optical communications module involved in the present invention is that above-mentioned opening restrictions is configured in the photo detector side of above-mentioned wavelength separated element.
And the architectural feature of optical communications module involved in the present invention is that above-mentioned wavelength separated element forms filter section on substrate, and is configured to make this filter section in the face of above-mentioned optical filter side.
In addition, the architectural feature of optical communications module involved in the present invention is, disposes light-emitting component on above-mentioned fibre-optic optical axis, incides in the above-mentioned light transmitting fiber after the above-mentioned optical filter of the light transmission that this light-emitting component sent.
The invention effect:
According to optical communications module involved in the present invention, configuration sees through the light wavelength resolution element of designated band between optical filter and photo detector, and only allow the opening restrictions of the light transmission of central area in the middle of the diverging light that sends from light transmitting fiber having on the light path between light transmitting fiber and the photo detector, thus, have only the little light transmission opening limiting element of incident angle of relative wavelength resolution element to arrive photo detector, therefore, even there is the incident angle dependence in the wavelength separated element, also can make the light that incides photo detector is the light of close limit wave band, the decline of the precision that can prevent to communicate by letter.
And, according to optical communications module involved in the present invention, because the opening restrictions is made of the element with opening, so can utilize materials such as stainless steel to form the opening restrictions simply.
And, according to optical communications module involved in the present invention, form the cone-shaped that broadens from light transmitting fiber side direction photo detector side because be located at the inner peripheral surface of the opening on the opening restrictions, so can prevent to bring harmful effect for the communication precision at the inner peripheral surface reflected light of opening.
And, according to optical communications module involved in the present invention,,, thereby can further improve the separation accuracy of wavelength so the state that does not comprise unnecessary composition with light sees through the opening restrictions because the opening restrictions is configured in the photo detector side of wavelength separated element.
And, according to optical communications module involved in the present invention, because the wavelength separated element forms filter section on substrate, and be configured to make filter section to face the optical filter side, so can reduce the reflected light influence on the substrate side surfaces of wavelength separated element, can further improve the separation accuracy of wavelength.
In addition, according to optical communications module involved in the present invention, because on fibre-optic optical axis, dispose light-emitting component, and incide on the light transmitting fiber after the light transmission optical filter that light-emitting component sent, so can possess emission function with simple structure.
Description of drawings
Fig. 1 is the synoptic diagram of the optical communications module in the 1st embodiment.
Fig. 2 is near the part enlarged drawing light transmitting fiber and the 1st photo detector in Fig. 1.
Fig. 3 is the synoptic diagram of the transmissivity relative wavelength of the 1st wavelength separated element.
Fig. 4 is the synoptic diagram that incides the light intensity distribution relative wavelength on the 1st photo detector.
Fig. 5 is the light transmitting fiber of the optical communications module in the 2nd embodiment and near the enlarged drawing the 1st photo detector.
Fig. 6 is the light transmitting fiber of the optical communications module in the 3rd embodiment and near the enlarged drawing the 1st photo detector.
Fig. 7 is the light transmitting fiber of the optical communications module in the 4th embodiment and near the enlarged drawing the 1st photo detector.
Fig. 8 is the light transmitting fiber of the optical communications module in the 5th embodiment and near the enlarged drawing the 1st photo detector.
Mark among the figure
1 body, 2 light transmitting fibers, 3 the 1st photo detectors, 4 the 2nd photo detectors, 5 light-emitting components, 6 the 1st optical filters, 7 the 2nd optical filters, 10 lens, 11 the 1st wavelength separated elements, the 11a substrate, 11b multi layer film filter portion, 12 the 2nd wavelength separated elements, 14 installation portions, 15 opening limiting elements, the 15a opening
Embodiment
To describe embodiments of the present invention in detail according to accompanying drawing below.Fig. 1 is the synoptic diagram of expression the 1st embodiment optical communications module.The optical communications module of the 1st embodiment for and light transmitting fiber 2 between carry out the module that the emission of light receives, light that configuration reception light transmitting fiber 2 sends body 1 in and the 1st photo detector the 3, the 2nd photo detector 4 that carries out opto-electronic conversion and to the light-emitting component 5 of light transmitting fiber 2 incident lights.Photo detector 3,4 is made of photodiode, and light-emitting component 5 is made of laser diode.
At body 1 the fixedly installation portion 14 of light transmitting fiber 2 is set.Light-emitting component 5 with in body 1 with the opposed position, end of light transmitting fiber 2 on the mode of configuration illuminating part 5a be fixed, pass the 2nd optical filter 7 and the 1st optical filter 6 incides on the end face of light transmitting fiber 2 at the light direct beam that illuminating part 5a sends.
The 1st photo detector 3 and the 2nd photo detector 4 are arranged on and are provided with on the face of face quadrature of installation portion 14 of body 1.That is, the optical axis of the 1st photo detector 3 and the 2nd photo detector 4 is the X-axis in the figure respectively, and is configured to, and the optical axis of the 1st photo detector 3 is at the optical axis of light transmitting fiber 2 sides, the 2nd photo detector 4 optical axis intersection at light-emitting component 5 sides and light transmitting fiber 2.
The light that light transmitting fiber 2 sends comprises the light of 3 wavelength, and the 1st wavelength and the 2nd wavelength be very approaching to have only following poor of 10nm, the 3rd wavelength to compare with the 1st wavelength probably to have differing from and differ greatly about 70nm.Specifically, the 1st wavelength is that 1560nm, the 2nd wavelength are that 1550nm, the 3rd wavelength are 1490nm.Wherein, the light of actual only the 1st wavelength that utilizes in communication and the light of the 3rd wavelength at the light of the 1st photo detector 3 receptions the 1st wavelength, receive the light of the 3rd wavelength at the 2nd photo detector 4.And the light of light-emitting component 5 emissions the 4th wavelength incides in the light transmitting fiber 2.
For the light of these a plurality of wavelength of branch's (difference), configuration optical filter 6,7 and wavelength separated element 11,12 in body 1.The 1st optical filter 6 is configured to all constitute roughly 45 ° angle with respect to the optical axis of the optical axis of light transmitting fiber 2 and the 1st photo detector 3 skewedly, and have reflection light of the 1st wavelength and the 2nd wavelength light wave band and make the feature of the light transmission of the light of the 3rd wavelength and the 4th wavelength.The bandpass filter of the 1st wavelength separated element 11 for only allowing the wave band of the 1st wavelength light see through has the feature that does not allow the wave band of the 2nd wavelength light see through.And configuration is as the opening limiting element 15 of opening restrictions between the 1st wavelength separated element 11 and the 1st photo detector 3.Its detailed content is with aftermentioned.
The 2nd optical filter 7 is configured to the optical axis of relative light transmitting fiber 2 and the optical axis of the 2nd photo detector 4 all constitutes roughly 45 ° angle with skewed, and has the light of reflection the 3rd wavelength and make the feature of the light transmission of the 4th wavelength.The 2nd wavelength separated element 12 constitutes as the bandpass filter that only allows the 3rd wavelength light wave band see through.
The structure of light on light path of the 1st photo detector 3 incided in explanation in more detail below.Fig. 2 is illustrated near the part enlarged drawing central light transmitting fiber 2 of Fig. 1 and the 1st photo detector 3.As shown in the drawing, the part of the diverging light of light transmitting fiber 2 emissions is by the direction of directive quadrature after 6 reflections of the 1st optical filter.The 1st wavelength separated element 11 of this light incident forms the 11b of multi layer film filter portion and constitutes on substrate 11a, and configuring multi-layer film wave filter 11b, makes it towards the 1st optical filter 6 sides.
The opening limiting element 15 that is disposed in the 1st photo detector 3 sides of the 1st wavelength separated element 11 constitutes so that the hole that opening 15a forms to be set on the parts that are made of corrosion resistant plate.The opening 15a of opening limiting element 15 is less than the diameter of the light that passes this position, and therefore, the light that has seen through the 1st wavelength separated element 11 has only light directive the 1st photo detector 3 sides of central area because of opening limiting element 15.
Incide the diverging light of light for penetrating of the 1st wavelength separated element 11, so the incident angle of the central part of light and circumference is different from light transmitting fiber 2.Fig. 3 represents the synoptic diagram of the transmissivity relative wavelength of the 1st wavelength separated element 11, and Fig. 4 represents to incide the synoptic diagram of the light intensity distribution relative wavelength of the 1st photo detector 3.As shown in Figure 3, the 1st wavelength separated element 11 demonstrates the characteristic that makes the light transmission of designated band when incident angle is 0 °.On the other hand, big if incident angle becomes, the band discontinuity that then sees through.
As shown in Figure 4, when opening limiting element 15 is not set, distance according to the distance light center incides the 1st wavelength separated element 11 with different angles, and this light will be directly incident on the 1st photo detector 3, so incide the light of the 1st photo detector 3 also comprises the 2nd wavelength of certain intensity except the light of the 1st wavelength light.In contrast, by opening limiting element 15 is set, have only the little light transmission opening limiting element 15 of the incident angle of the 1st wavelength separated element 11 is arrived the 1st photo detector 3, even, also can make the light that incides the 1st photo detector 3 become the light of close limit wave band so there is the incident angle dependence in the 1st wavelength separated element 11.That is, when containing the 1st wavelength light, only contain the 2nd minimum wavelength light of intensity on the other hand, therefore can receive the light of the 1st wavelength reliably, and can prevent the precise decreasing of communicating by letter at the 1st photo detector 3.
About the size of the opening 15a of opening limiting element 15, if opening 15a is big, then the optical transmission rate just becomes big, but comprises more wavelength components; If opening 15a is little, the performance that then stops the redundant wave long component is with regard to grow, but the optical transmission rate diminishes.Therefore, making suitably, setting makes characteristic shown in Figure 4 become specified characteristic.
In addition, as mentioned above, the light that incides in the 1st photo detector 3 contains a plurality of close wave bands, so configuration opening limiting element 15 makes the light of the 1st wave band incide the 1st photo detector 3 reliably on light path, but at the light that the 2nd photo detector 4 receives is light away from the 3rd wavelength of the 1st wavelength and the 2nd wavelength, so there is no need to carry out high-precision separation, therefore not at the 2nd photo detector 4 sides configuration opening limiting element 15.
Other embodiments of the present invention will be described below.Fig. 5 represents the light transmitting fiber 2 of optical communications module of the 2nd embodiment and near the enlarged drawing the 1st photo detector 3.The structure of the optical communications module among this figure is identical with the 1st embodiment except the position of opening limiting element 15, and relevant common ground will omit explanation.In addition, also also same in the embodiment below.As shown in Figure 5, the opening limiting element 15 on the present embodiment be configured on the light path between light transmitting fiber 2 and the 1st photo detector 3, the 1st optical filter 6 sides of the 1st wavelength separated element 11.And the 1st wavelength separated element 11 makes substrate 11a towards the 1st photo detector 3 sides, makes the 11b of multi layer film filter portion towards the 1st optical filter 6 sides.
Fig. 6 represents the light transmitting fiber 2 of optical communications module of the 3rd embodiment and near the enlarged drawing the 1st photo detector 3.As shown in the drawing, the opening limiting element 15 and the 1st embodiment of present embodiment are same, are configured on the light path between light transmitting fiber 2 and the 1st photo detector 3, the 1st photo detector 3 sides of the 1st wavelength separated element 11.On the other hand, the 1st wavelength separated element 11 is configured to, and makes substrate 11a towards the 1st optical filter 6 sides, makes the 11b of multi layer film filter portion towards the 1st wavelength separated element 11 sides.That is, the configuration direction of the 1st wavelength separated element 11 is opposite with the 1st embodiment.
Fig. 7 represents the light transmitting fiber 2 of optical communications module of the 4th embodiment and near the enlarged drawing the 1st photo detector 3.As shown in the drawing, the opening limiting element 15 of present embodiment is configured on the light path between light transmitting fiber 2 and the 1st photo detector 3, the 1st optical filter 6 sides of the 1st wavelength separated element 11.And the substrate 11a that makes the 1st wavelength separated element 11 makes the 11b of multi layer film filter portion towards the 1st photo detector 3 sides towards the 1st optical filter 6 sides.That is, the configuration direction of the 1st wavelength separated element 11 is opposite with the 2nd embodiment.
As mentioned above, even belong to the configuration relation of the 2nd to the 4th embodiment, also can only isolate the light of the 1st wavelength accurately and receive by the 1st photo detector 3.But, if consider the influence of the reflection on the opening 15a inner peripheral surface of reflection on the substrate 11a side that constitutes the 1st wavelength separated element 11 or opening limiting element 15 etc., stop after the unnecessary composition of light in advance by multi layer film filter 11b, by 15 the 1st embodiments that extract central area light of opening limiting element, the performance of separation is become well.
Fig. 8 represents the light transmitting fiber 2 of the 5th embodiment optical communications module and near the enlarged drawing the 1st photo detector 3.The wavelength separated element 11 of present embodiment and the configuration relation of opening limiting element 15 are identical with the 1st embodiment.In the present embodiment, have only the structure of opening limiting element 15 different with the 1st embodiment.The inner peripheral surface of the opening 15a of opening limiting element 15 forms the cone-shaped that broadens towards the 1st photo detector 3 sides from the 1st wavelength separated element 11 sides.The angle of this taper is greater than the maximum inclination angle of light on periphery of the opening 15a that incides opening limiting element 15.Thereby, can prevent to incide light on the opening limiting element 15 in the reflection of the inner peripheral surface of opening 15a and bring harmful effect for the communication precision.And, in the 2nd to the 4th embodiment, also make the opening 15a of opening limiting element 15 form the cone-shaped that broadens to the 1st photo detector 3 sides, thereby the light that can prevent to incide opening limiting element 15 equally is in the inner peripheral surface reflection of opening 15a and bring harmful effect for the communication precision.
More than, embodiments of the present invention are illustrated, but of the present invention being suitable for is not limited to these embodiments, in its technological thought scope, can obtain various being suitable for.For example, in Shuo Ming the embodiment, opening limiting element 15 forms with the hole with opening 15a in the above, is different parts with the 1st wavelength separated element 15, but can be on the 1st wavelength separated element 11 integrally formed opening restrictions.In this case, can form opening by etching on the surface of the 1st wavelength separated element 11 and constitute the opening restrictions.
And, as the structure of opening restrictions, be not limited to have the hole of opening etc., as long as it is just passable to make the 1st photo detector 3 receive only the light of central area, for example, can also sees through wave filter with diffraction grating or part and wait and constitute.
Claims (6)
1. optical communications module possesses the photo detector that receives the light that light transmitting fiber sends and to the radiative light-emitting component of above-mentioned light transmitting fiber, and the diverging light that above-mentioned light transmitting fiber is sent incides in the above-mentioned photo detector,
It is characterized in that,
Above-mentioned photo detector is configured to its optical axis and above-mentioned fibre-optic optical axis intersection, optical filter is configured to mutually opposed with above-mentioned light transmitting fiber, this optical filter reflects the light that above-mentioned light transmitting fiber sends and makes it incide above-mentioned photo detector, configuration makes the wavelength separated element of the light transmission of designated band between above-mentioned optical filter and photo detector
On the light path between above-mentioned light transmitting fiber and the photo detector, has the opening restrictions that only makes the light transmission of central area from the diverging light that above-mentioned light transmitting fiber sends.
2. optical communications module according to claim 1 is characterized in that, above-mentioned opening restrictions is made of the element with opening.
3. optical communications module according to claim 2 is characterized in that, the inner peripheral surface that is located at the opening of above-mentioned opening restrictions forms the cone-shaped that broadens towards the photo detector side from above-mentioned light transmitting fiber side.
4. according to any described optical communications module in the claim 1 to 3, it is characterized in that above-mentioned opening restrictions is configured in the photo detector side of above-mentioned wavelength separated element.
5. optical communications module according to claim 4 is characterized in that, above-mentioned wavelength separated element forms filter section on substrate, and is configured to make this filter section in the face of above-mentioned optical filter side.
6. according to any described optical communications module in the claim 1 to 5, it is characterized in that, on above-mentioned fibre-optic optical axis, dispose light-emitting component, incide in the above-mentioned light transmitting fiber after the above-mentioned optical filter of the light transmission that this light-emitting component sent.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009192926A JP2011044635A (en) | 2009-08-24 | 2009-08-24 | Optical communication module |
| JP192926/2009 | 2009-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101995619A true CN101995619A (en) | 2011-03-30 |
Family
ID=43786009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102438065A Pending CN101995619A (en) | 2009-08-24 | 2010-08-02 | Light communication module |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2011044635A (en) |
| CN (1) | CN101995619A (en) |
| TW (1) | TW201115197A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869429B (en) * | 2012-12-13 | 2017-12-12 | 赛恩倍吉科技顾问（深圳）有限公司 | Photoelectric coupling part and its photoelectric conversion device used |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5341275A (en) * | 1992-01-22 | 1994-08-23 | Abbas Ghandehari | Compact light source for fiber optics illumination |
| CN1797051A (en) * | 2004-12-28 | 2006-07-05 | 三星电子株式会社 | Optical module for multi-wavelength |
| CN1983880A (en) * | 2005-12-12 | 2007-06-20 | 日立通讯技术株式会社 | Optical prism and optical transceiver module for optical communications |
| US7835048B2 (en) * | 2006-10-13 | 2010-11-16 | Thomson Licensing | Holographic storage system with multiple reference beams |
-
2009
- 2009-08-24 JP JP2009192926A patent/JP2011044635A/en not_active Withdrawn
-
2010
- 2010-08-02 CN CN2010102438065A patent/CN101995619A/en active Pending
- 2010-08-13 TW TW99127123A patent/TW201115197A/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5341275A (en) * | 1992-01-22 | 1994-08-23 | Abbas Ghandehari | Compact light source for fiber optics illumination |
| CN1797051A (en) * | 2004-12-28 | 2006-07-05 | 三星电子株式会社 | Optical module for multi-wavelength |
| CN1983880A (en) * | 2005-12-12 | 2007-06-20 | 日立通讯技术株式会社 | Optical prism and optical transceiver module for optical communications |
| US7835048B2 (en) * | 2006-10-13 | 2010-11-16 | Thomson Licensing | Holographic storage system with multiple reference beams |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011044635A (en) | 2011-03-03 |
| TW201115197A (en) | 2011-05-01 |
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Application publication date: 20110330 |