CN102223174A - Optical module integrated with function of optical time domain reflectometer - Google Patents
Optical module integrated with function of optical time domain reflectometer Download PDFInfo
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- CN102223174A CN102223174A CN2011101360960A CN201110136096A CN102223174A CN 102223174 A CN102223174 A CN 102223174A CN 2011101360960 A CN2011101360960 A CN 2011101360960A CN 201110136096 A CN201110136096 A CN 201110136096A CN 102223174 A CN102223174 A CN 102223174A
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Abstract
The invention discloses an optical module integrated with the function of an optical time domain reflectometer, comprising a laser for emitting downlink light, and a first photoelectric detector for receiving downlink light, wherein the optical module is also internally provided with a second photoelectric detector and a first filter plate; an antireflection film and a reflection increasing film with the wavelengths corresponding to downlink light are coated on the first filter plate; the first filter plate is obliquely arranged in a frontal optical path of a laser emitting head of the laser, wherein one surface of the first filter plate faces to the laser; the other surface of the first filter plate faces to the second photoelectric detector and the optical fiber; an OTDR detecting light with the same wavelength with the downlink is emitted by the laser; the OTDR detecting light passes by the first filter plate and enters in the optical fiber; and the OTDR detecting light reflected back by the optical fiber is reflected by the first filter plate and enters in the second photoelectric detector. By adopting the optical module, the PON system does not need the traditional optical time domain reflectometer during the breakpoint analysis process, thus reducing maintenance cost of the system and facilitating the maintenance operation.
Description
Technical field
The invention belongs to technical field of optical fiber communication, specifically, relate to a kind of optical module that is applied to optical access network.
Background technology
In optical fiber telecommunications system, the transmission medium of light---optical fiber/optical cable often is laid on countryside or seabed, occurs problems such as link failure or transmission equipment fault unavoidably.To break down or the position of breakpoint in order can accurately locating, to adopt special optical time domain reflectometer (OTDR) to carry out detection and location at present usually.
OTDR, receives the information of returning at the OTDR port then and analyzes in optical fiber by the emission light pulse.When light pulse is transmitted in optical fiber, can produce scattering and reflection owing to character, connector, junction point, bending or other similar incident of optical fiber itself, wherein a part of scattering and reflected light signal will turn back among the OTDR, the useful information that returns is measured by the detector of OTDR, as time on the diverse location in the optical fiber or curve segment.OTDR uses Rayleigh scattering and Fresnel reflection to characterize the characteristic of optical fiber.Rayleigh scattering forms owing to light signal produces irregular scattering along optical fiber, and OTDR just measures a part of scattered light that turns back to the OTDR port.These backscatter signals have just shown decay (loss/distance) degree that is caused by optical fiber.Fresnel reflection is the reflection of dispersing, and it is caused that by the indivedual points in the whole piece optical fiber these are made up of the factor that causes reverse parameter to change.On these aspects, have very strong back-scattering light and be reflected.Therefore, OTDR utilizes the information of Fresnel reflection be located by connecting point, fibre-optic terminus or breakpoint.
OTDR equipment price costliness commonly used, and volume is bigger, when carrying out breakpoint analysis, optical fiber and system need be disconnected, light pulse by a specific wavelength of OTDR emission enters in the optical fiber then, the light signal that utilizes optical fiber link to reflect is input to the OTDR port, analyzes, and then orients the position of fault or breakpoint.
Summary of the invention
The object of the present invention is to provide a kind of optical module that is integrated with the optical time domain reflectometer function, can realize the function of OTDR, compare the prior art that tradition adopts special optical time domain reflectometer to carry out the optical fiber link fault detect, have simple to operate, cheap characteristics.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of optical module that is integrated with the optical time domain reflectometer function comprises laser that is used for transmitting downstream light and first photodetector that is used to receive up light; Wherein, also be provided with second photodetector and first filter in described optical module, be coated with the anti-reflection film of descending light institute corresponding wavelength and increase anti-film on described first filter, the transmissivity of described anti-reflection film is A, the reflectivity that increases anti-film is B, and A＞B, A+B=1; Described first filter is tilted to be laid in the place ahead light path of laser beam emitting head of laser, wherein one side is towards laser, and another side is towards second photodetector and optical fiber; When carrying out the breakpoint test, by the OTDR detection light of described laser emission, pass first filter and inject optical fiber with descending smooth co-wavelength, the OTDR that returns by fiber reflection surveys light after the reflection of first filter, described second photodetector of directive.
Further, the preferred value between 70% to 90% of described A; Described B is value between 10% to 30% preferably.
Inject second photodetector for fear of the light signal of other wavelength, between described first filter and second photodetector, also be provided with the 3rd filter, on described the 3rd filter, be coated with the anti-reflection film of OTDR detection light institute corresponding wavelength, the OTDR that returns by fiber reflection surveys light after the reflection of first filter, described the 3rd filter of directive, and see through the 3rd filter and inject described second photodetector.
Preferably, the described OTDR that returns by fiber reflection surveys light after the reflection of first filter, vertically injects described the 3rd filter, and passes described the 3rd filter and vertically inject described second photodetector.
Further, the acute angle of the emission light angle of described first filter and laser is 45 °, promptly inject described first filter with acute angle angle at 45, can realize that thus reverberation and incident light angle just become 90 ° by the descending light or the OTDR detection light of laser emission; So described second photodetector is laid in a side of laser, and the axis direction of the light-receiving head of the axis direction of the laser beam emitting head of laser and second photodetector is perpendicular, can realize just that thus surveying light by the OTDR after the reflection of first filter can vertically inject described second photodetector.
Further again, in described optical module, also be provided with processor, connect described second photodetector, receive the signal of telecommunication of second photodetector conversion output, and then calculate the position of each reflection peak, positional information by each connector that will dispose in the position of each reflection peak and the system is compared, and judges the breakpoint location in the optical fiber link.
In order to make optical module can accurately receive up light, in the light path of the place ahead of described first filter, also tilt to be laid with second filter, described second filter wherein one side is towards first filter, another side is towards first photodetector and optical fiber; Be coated with the anti-film that increases of the anti-reflection film of descending light institute corresponding wavelength and up light institute corresponding wavelength on described second filter, the light of launching by laser sees through the first filter directive, second filter, and passes second filter and inject optical fiber; The up light that returns by optical fiber reflexes in described first photodetector through second filter when directive second filter.
For the light signal of isolating other wavelength is injected first photodetector, between described second filter and first photodetector, also be provided with the 4th filter, on described the 4th filter, be coated with the anti-reflection film of up light institute corresponding wavelength, the up light that returns by optical fiber is after the reflection of second filter, described the 4th filter of directive, and see through the 4th filter and inject described first photodetector.
Further, the topology layout of optical module for convenience, described second filter is 45 ° with the acute angle that descending light that sees through first filter or OTDR survey the light angle, promptly descending light or the OTDR detection light that transmits by first filter is injected described second filter with acute angle angle at 45, can realize that thus reverberation and incident light angle just become 90 °; Described first photodetector is laid in a side of laser, and the axis direction of the light-receiving head of the axis direction of the laser beam emitting head of laser and first photodetector is perpendicular, the up light that returns by optical fiber is when injecting second filter like this, and its reverberation can vertically be injected described first photodetector.
In order to reduce the volume of optical module as far as possible, preferably described first photodetector and the second photodetector branch are located at the both sides of laser, to make things convenient for topology layout.
Compared with prior art, advantage of the present invention and good effect are: the present invention uses descending light wavelength to survey light as OTDR, thereby need not additionally increase a seed light source by multiplexing descending light, has reduced hardware cost.Be used for receiving the receiving element that OTDR that optical fiber reflects surveys light by built-in in optical module, and then judge breakpoint location, realized the OTDR function thus, finished detection and breakpoint analysis task light signal according to the reverberation that receives.The present invention is by the function of integrated optical time domain reflectometer in optical module, thereby can be so that the PON system no longer needs to use traditional dedicated optical time-domain reflectomer in the breakpoint analysis process, not only can reduce the maintenance cost of system thus, but also have simple to operate, significant advantages such as integrated level is high, easy maintenance.
After reading the detailed description of embodiment of the present invention in conjunction with the accompanying drawings, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the light path schematic diagram of interior optics of a kind of embodiment of the optical module that is integrated with the optical time domain reflectometer function proposed by the invention;
Fig. 2 is the structural representation of optical device of a kind of embodiment of the optical module that is integrated with the optical time domain reflectometer function proposed by the invention;
Fig. 3 is the longitudinal sectional view of optical module shown in Figure 2;
Fig. 4 is a kind of typical PON connected mode schematic diagram;
Fig. 5 is the signal waveforms that records at the second photodetector end when adopting the optical module that is integrated with the optical time domain reflectometer function proposed by the invention to carry out the breakpoint detection.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is done explanation in further detail.
PON is the abbreviation of Passive Optical Network, i.e. EPON.The PON technology is the access technology of a kind of typical point to multiple spot, is made up of optical line terminal (OLT) optical module of local side, optical network unit (ONU) optical module and the Optical Distribution Network (ODN) of user side.In a PON system, generally only comprise an optical line terminal (OLT) optical module, be installed in the console for centralized control, transmitting downstream light transfers to respectively in the optical network unit ONU s optical modules at different levels by optical fiber by behind the ODN demultiplexing light signal.Described optical network unit ONU optical module is installed on customer site, and a customer site need be installed an ONU optical module, receives the descending light that the OLT optical module sends, and returns up light to the OLT optical module.
The present invention is in optical module during integrated optical time domain reflectometer function, consider as if integrated this function in the ONU optical module, owing to can not predict the breakpoint location in the light path in advance, therefore need be in each ONU optical module all integrated OTDR functional circuit, can cause the significantly rising of system hardware cost thus, and practicality is relatively poor.Based on this, the present invention is integrated OTDR function in the OLT optical module preferably, light pulse by a specific wavelength of the emission of the laser in the OLT optical module enters optical fiber, and the light that utilizes optical fiber link to reflect is input to the OTDR functional circuit in the OLT optical module, carries out breakpoint analysis.Like this,, only need an OLT optical module is carried out architecture advances, can realize fault detection capability the whole system optical fiber link for a PON system.
Be example with integrated optical time domain reflectometer function in the OLT optical module below, elaborate the concrete structure design and the operation principle thereof of the optical module of the described OTDR of having function by a specific embodiment.
Embodiment one, as the optical line terminal OLT optical module of a typical Optical Access Network, be EPON OLT or GPON OLT all to have used wavelength be the descending light of 1490nm, then use the descending light of wavelength for 10GPON OLT as 1577nm.The laser of the multiplexing dexterously OLT optical module of present embodiment is as the transmitting illuminant of OTDR function, emission is surveyed light with the OTDR of the identical wavelength of descending light, be used for the breakpoint test, so only need to increase the light signal receiving element of the descending light of cover OLT optical module institute corresponding wavelength in the inside of OLT optical module, just can carry out the catoptrical detection of OTDR, and the light signal that detects is converted to the signal of telecommunication exports to processor, carry out data analysis, and then find out breakpoint location, realize fault location.
Descending light with the 1490nm wavelength is the explanation of example specific explanations: for the optical module of present embodiment, what " descending light " and " OTDR surveys light " utilized all is the light of 1490nm, but both effect differences are not worked simultaneously.When the optical module operate as normal, the light of the 1490nm of laser emission is called " descending light ", is transmitted into the ONU optical module by the OLT optical module; When carrying out the breakpoint detection, this light present embodiment is called " OTDR surveys light ", because the effect in this time has not been descending.
Referring to shown in Figure 1, the OLT optical module of present embodiment comprises the laser that is used for transmitting downstream light, be used to receive the up light of ONU optical module emission first photodetector, be used to receive OTDR that optical fiber reflects and survey second photodetector of light and be used to change the transmission path that the described OTDR that reflects surveys light, the first filter F1 that makes its directive second photodetector.The described first filter F1 is special Thin Film Filter, can adopt the mode of plating anti-reflection film or increasing anti-film on thin transparent film (such as sheet glass) to be made.On the first filter F1 of present embodiment, be coated with the anti-reflection film of descending light institute corresponding wavelength and increase anti-film, such as the anti-reflection film of 1490nm with increase anti-film, can be plated in any one side of thin transparent film or separately be plated on the two sides.In order to satisfy the transmission designing requirement of descending light, suppose that the transmissivity of the anti-reflection film that crosses is A on thin transparent film, the reflectivity that increases anti-film is B, then should satisfy the condition of A＞B and A+B=1.Wherein, the preferred value in 70% to 90% scope of described A; Described B is value in 10% to 30% scope preferably.As a kind of preferred design, present embodiment preferably crosses attached transmissivity on thin transparent film be that 80% 1490nm anti-reflection film and reflectivity are that 20% 1490nm increases anti-film.The described first filter F1 is tilted to be laid in the place ahead light path of laser beam emitting head of laser (definition laser transmitting downstream direction of light is the place ahead), the b face of supposing the first filter F1 is towards laser, the a face is towards the optical fiber and second photodetector, as shown in Figure 1, then when OLT optical module operate as normal, descending light by the laser emission can enter optical fiber through the first filter F1 with lower loss, and then transfers to the ONU optical module.And when the OLT optical module carries out the breakpoint test, the OTDR of 1490nm by laser emission surveys light and can see through the first filter F1 with lower loss equally and enter optical fiber, and in transmission course, run into and reflect discontinuous local time, return the OLT optical module by optical fiber.The OTDR that returns by fiber reflection surveys light when arriving a face of the first filter F1, then its original transmission path of change under the reflex of anti-film can increased, then described second photodetector of directive, and then realize of the effective reception of second photodetector to OTDR detection light.Because second photodetector is laid in a side of the first filter a face, therefore, the light that reflection takes place by the b face can not be injected in second photodetector, can guarantee the accuracy of breakpoint test thus.
In order to realize the accurate reception of first photodetector to up light, present embodiment also is provided with the second filter F2 on the place ahead light path of the first filter F1, is used for reflecting up light to described first photodetector, as shown in Figure 1.The described second filter F2 also is a kind of special Thin Film Filter, can adopt equally in the attached mode that increases anti-film or anti-reflection film of the last plating of thin transparent film (such as sheet glass) to be made.In the present embodiment, can operate as normal and realize that first photodetector effectively receives up light ground in order to ensure optical module, on the described second filter F2, be coated with the anti-reflection film that increases anti-film and descending light institute corresponding wavelength of up light institute corresponding wavelength, such as the anti-reflection film of anti-film of increasing of 1310nm and 1490nm.Described anti-reflection film and increase anti-film and can be plated in any one side of thin transparent film or separately be plated on the two sides, its transmissivity and reflectivity are preferably more than 98%.The second filter F2 is tilted to be laid in the place ahead light path of the first filter F1, suppose the b face towards the first filter F1, then a face is towards first photodetector and optical fiber.
When the optical module operate as normal, the light signal of descending 1490nm by laser emission sees through two filter F1, F2 and enters optical fiber, and can not seal in first photodetector that receives the 1310nm light signal and second photodetector that receives the 1490nm light signal.The up light of the 1310nm that returns by optical fiber is on being injected into the second filter F2 time, reflect, and then inject first photodetector of 1310nm, and can not seal in second photodetector of 1490nm, guaranteed the accurate transmission of light signal between OLT optical module and the ONU optical module thus.When system broke down needs use OTDR function, by the light pulse of a 1490nm wavelength of the emission of the laser in the OLT optical module, promptly OTDR surveyed light, injects optical fiber by light path.The light signal of the 1490nm that the optical fiber link breakpoint reflects owing to Rayleigh scattering and Fresnel reflection, see through the second filter F2 directive, the first filter F1, and then on the first filter F1, reflect, inject second photodetector of 1490nm, after carrying out the photoelectricity conversion, useful signal is exported to processor, such as the DSP process chip, thereby carry out accident analysis, realize the breakpoint location.
To crosstalk in order further reducing, to improve the reception precision of first, second photodetector, two filter plate F3, F4 need further be set, as shown in Figure 1 in optical module required wavelength light signal.Wherein, the 3rd filter F3 is laid between a face and second photodetector of the first filter F1, and is coated with the anti-reflection film that OTDR surveys light institute corresponding wavelength on it, such as the anti-reflection film of 1490nm.Preferably make the axis direction of light-receiving head of the plane at the 3rd filter F3 place and second photodetector perpendicular, rationally lay the 3rd filter F 3 and the installation site of second photodetector in optical module, the light signal that makes the 1490nm that a face by the first filter F1 reflects is directive the 3rd filter F3 vertically, and sees through the 3rd filter F3 and vertically inject second photodetector.Thus, can further shield the light signal of other wavelength, avoid it to inject second photodetector, to improve accuracy of detection.In like manner, the 4th filter F4 is laid between a face and first photodetector of the second filter F2, and is coated with the anti-reflection film of up light institute corresponding wavelength thereon, such as the anti-reflection film of 1310nm.By reasonable laying the 4th filter F4 and the installation site of first photodetector in optical module, the light signal that can make the up 1310nm that a face by the second filter F2 reflects is directive the 4th filter F4 vertically, and see through the 4th filter F4 and vertically inject first photodetector, with the accurate reception that realizes that the OLT optical module is sent out light up to the ONU optical module.
Structural design for convenience of optical module inside, when tilting to lay described first, second filter F1, F2, preferably the acute angle with the transmission light path angle of the descending light of itself and laser emission is designed to 45 °, be angle α=45 ° among Fig. 1, that is to say, descending light or OTDR detection light by the laser emission are injected the described first filter F1 with 45 ° angle, and also inject the described second filter F2 with 45 ° angle by descending light or OTDR detection light that the first filter F1 transmits.So, if laser transmitting downstream direction of light is defined as the place ahead, then first, second photodetector and the 3rd, the 4th filter F3, F4 then can parallelly be laid in a side of the transmission light path of described descending light, promptly can be laid in the left side or the right side of laser, and the axis direction of its light-receiving head is perpendicular to the axis direction of the laser beam emitting head of laser.Thus one, survey light by the up light after a face reflection of first, second filter F1, F2 with OTDR and then can vertically inject described first, second photodetector.Because the size of photodetector is bigger,, then must design the optical module of large-size, to hold above-mentioned optics as if the same side that first, second photodetector is arranged on laser.In order to reduce the volume of optical module as far as possible, present embodiment preferably is located at first photodetector and the second photodetector branch both sides of laser, be the left and right sides of transmission light path of the descending light of described laser emission, as shown in Figure 1, to make things convenient for the integral structure layout of optical module.
Fig. 2, Fig. 3 are the structure chart of the optical device of described optical module, and wherein, first, second, third, fourth filter 5-8 is installed on the inside of round and square tube body 4 in the optical module, specifically can be fixed on the inner carriage of round and square tube body 4, referring to shown in Figure 3.Three sides of round and square tube body 4 outsides are provided with TO (Transistor-Outline, column type encapsulation body), be respectively applied for described laser 1, first photodetector 2 and second photodetector 3 are installed, referring to shown in Figure 2.Particular location relation between each parts should satisfy light transmission requirement shown in Figure 1.Described laser 1 connects laser driver, and described first photodetector 2 connects limiting amplifier, and described second photodetector 3 connects the DSP process chip.
Fig. 4 is an a kind of typical PON system connected mode, and for the purpose of simplifying the description, present embodiment is an example with the PON system that adopts 1 OLT optical module and 3 ONU optical modules and set up, and the breakpoint testing process of the optical module of the described OTDR of being integrated with function is set forth.
Among Fig. 4, suppose that the OLT optical module connects optical splitter by the long optical fiber of one section 10km, by optical splitter descending light is divided into three the tunnel after, transfer to three ONU optical module ONU1, ONU2, ONU3 respectively.Wherein, be 1km from optical splitter to the distance the ONU1 optical module; Is 2km from optical splitter to the distance the ONU2 optical module; Is 10km from optical splitter to the distance the ONU3 optical module.Fracture has taken place in the 7km place of supposing optical fiber between optical splitter and ONU3 optical module.When the optical module that is integrated with the OTDR function that utilizes present embodiment to propose carries out the detection of optical fiber link, at first the light pulse (being that OTDR surveys light) of setting wavelength by one of OLT optical module emission enters optical fiber, can detect as shown in Figure 5 signal waveform by second photodetector in the OLT optical module then.
As shown in Figure 5 and since light signal in transmission course in case run into discontinuous place, in the local time of such as connector or breakpoint etc., Fresnel reflection can take place.Therefore, at distance 10km place, because the existence of optical splitter, descending light can reflect at the optical splitter place, and therefore, second photodetector in the OLT optical module can detect a Fresnel reflection peak at the 10km place; At the 11km place, can detect the reflection peak of ONU1 optical module; At the 12km place, can detect the reflection peak of ONU2 optical module; At the 17km place, can detect the reflection peak that fibercuts causes.
The method that breakpoint is measured: the comparison system layout, can learn that breakpoint has taken place at ONU 3 optical module places, promptly the ONU3 place among Fig. 5 is an abnormity point.Suppose the T after OLT optical module emission light pulse
2Time receives the reflection peak of ONU3, and the breakpoint place apart from the distance of OLT optical module is so:
Wherein, c=3 * 10
8M/s is the light velocity; N is the refractive index of fiber core; D is the distance of breakpoint apart from the OLT optical module.
Owing in the OLT optical module, store the positional information of each connector, such as the positional information of optical splitter and each ONU optical module etc., therefore, DSP process chip in the OLT optical module is after calculating the distance of each reflection peak apart from the OLT optical module, can judge breakpoint location automatically according to the positional information of each connector, offer the attendant, simple to operate, safeguard easily.
Present embodiment designs for simplified system, and the descending light of multiplexing OLT optical module is finished the breakpoint detection mission of OTDR as the transmitting illuminant of OTDR function.Certainly, the laser of also can specialized designs launching other wavelength light signals is exclusively used in the breakpoint detection process of OTDR, and still, this design obviously can be brought the rising of hardware cost, therefore, and not as preferred design.
Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (10)
1. an optical module that is integrated with the optical time domain reflectometer function comprises laser that is used for transmitting downstream light and first photodetector that is used to receive up light; It is characterized in that: in described optical module, also be provided with second photodetector and first filter, on described first filter, be coated with the anti-reflection film of descending light institute corresponding wavelength and increase anti-film, the transmissivity of described anti-reflection film is A, and the reflectivity that increases anti-film is B, and A＞B, A+B=1; Described first filter is tilted to be laid in the place ahead light path of laser beam emitting head of laser, wherein one side is towards laser, and another side is towards second photodetector and optical fiber; When carrying out the breakpoint test, by the OTDR detection light of described laser emission, pass first filter and inject optical fiber with descending smooth co-wavelength, the OTDR that returns by fiber reflection surveys light after the reflection of first filter, described second photodetector of directive.
2. optical module according to claim 1 is characterized in that: described A is value between 70% to 90%; Described B is value between 10% to 30%.
3. optical module according to claim 1, it is characterized in that: between described first filter and second photodetector, also be provided with the 3rd filter, on described the 3rd filter, be coated with the anti-reflection film of OTDR detection light institute corresponding wavelength, the OTDR that returns by fiber reflection surveys light after the reflection of first filter, described the 3rd filter of directive, and see through the 3rd filter and inject described second photodetector.
4. optical module according to claim 3, it is characterized in that: the described OTDR that returns by fiber reflection surveys light after the reflection of first filter, vertically inject described the 3rd filter, and pass described the 3rd filter and vertically inject described second photodetector.
5. according to each described optical module in the claim 1 to 4, it is characterized in that: the acute angle of the emission light angle of described first filter and laser is 45 °; Described second photodetector is laid in a side of laser, and the axis direction of the light-receiving head of the axis direction of the laser beam emitting head of laser and second photodetector is perpendicular.
6. according to each described optical module in the claim 1 to 4, it is characterized in that: in described optical module, also be provided with processor, connect described second photodetector, receive the signal of telecommunication of second photodetector conversion output, and then calculate the position of each reflection peak, positional information by each connector that will dispose in the position of each reflection peak and the system is compared, and judges the breakpoint location in the optical fiber link.
7. according to each described optical module in the claim 1 to 4, it is characterized in that: in the light path of the place ahead of described first filter, also tilt to be laid with second filter, described second filter wherein the one side towards first filter, another side is towards first photodetector and optical fiber; Be coated with the anti-film that increases of the anti-reflection film of descending light institute corresponding wavelength and up light institute corresponding wavelength on described second filter, the light of launching by laser sees through the first filter directive, second filter, and passes second filter and inject optical fiber; The up light that returns by optical fiber reflexes in described first photodetector through second filter when directive second filter.
8. optical module according to claim 7, it is characterized in that: between described second filter and first photodetector, also be provided with the 4th filter, on described the 4th filter, be coated with the anti-reflection film of up light institute corresponding wavelength, the up light that returns by optical fiber is after the reflection of second filter, described the 4th filter of directive, and see through the 4th filter and inject described first photodetector.
9. optical module according to claim 7 is characterized in that: described second filter is 45 ° with the acute angle of the descending light angle that sees through first filter; Described first photodetector is laid in a side of laser, and the axis direction of the light-receiving head of the axis direction of the laser beam emitting head of laser and first photodetector is perpendicular.
10. optical module according to claim 9 is characterized in that: described first photodetector and the second photodetector branch are located at the both sides of laser.
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| CN108155934A (en) * | 2017-12-22 | 2018-06-12 | 武汉光迅科技股份有限公司 | A kind of OLT ends optical transceiver module and method with time domain reflection function |
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| CN108155934A (en) * | 2017-12-22 | 2018-06-12 | 武汉光迅科技股份有限公司 | A kind of OLT ends optical transceiver module and method with time domain reflection function |
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| CN114791651A (en) * | 2021-01-25 | 2022-07-26 | 讯芸电子科技(中山)有限公司 | Transistor outline package optical transceiver |
| CN114791651B (en) * | 2021-01-25 | 2023-08-04 | 讯芸电子科技(中山)有限公司 | Transistor outline package optical transceiver |
| CN113670855A (en) * | 2021-08-13 | 2021-11-19 | 力合科技（湖南）股份有限公司 | Laser detection device, organic carbon element carbon analyzer and laser detection method |
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