CN202772894U - Optical module with optical time domain reflection function - Google Patents

Optical module with optical time domain reflection function Download PDF

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Publication number
CN202772894U
CN202772894U CN 201220357009 CN201220357009U CN202772894U CN 202772894 U CN202772894 U CN 202772894U CN 201220357009 CN201220357009 CN 201220357009 CN 201220357009 U CN201220357009 U CN 201220357009U CN 202772894 U CN202772894 U CN 202772894U
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Prior art keywords
optical
filter
time domain
reflection function
domain reflection
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Chinese (zh)
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邹翔
宋琛
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Hisense Broadband Multimedia Technology Co Ltd
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Hisense Broadband Multimedia Technology Co Ltd
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Abstract

The utility model provides an optical module with optical time domain reflection function. The optical module with optical time domain reflection function comprises a laser for emitting upward light, a photoelectric detector for receiving a downward light signal, a first optical filter for reflecting an optical time domain signal, a second optical filter for reflecting an optical time domain detection signal and an optical interface which is used for external connection with optical fibers. The first optical filter is obliquely arranged among the laser, the photoelectric detector and the optical interface; one surface of the first optical filter is towards the photoelectric detector and the optical interface, while the other surface of the first optical filter is towards the laser; the second optical filter is located between the first optical filter and the photoelectric detector; and one surface of the second optical filter is a curved surface structure which is towards the first optical filter. By arranging the second optical filter as a curved surface structure, the yield and the reliability of the optical module with optical time domain reflection function are increased, and the volume of the optical module with optical time domain reflection function is reduced.

Description

Optical assembly with time domain reflection function
Technical field
The utility model relates to technical field of optical fiber communication, particularly relates to a kind of optical assembly with time domain reflection function.
Background technology
In recent years, based on FTTx(FTTH, the FTTB of optical fiber communication, FTTC etc.) broadband network relies on it can be for the user provide voice, data and Video service at a high speed, and be able to fast development.But operator is to user's supervision and the detection and localization of optical network link case point, contradiction.At present, in the process that the optical network unit (ONU) as user side is detected, mainly be to identify by user's data traffic as the optical line terminal (OLT) of local side, can not locate accurately and monitor the user.And optical time domain reflectometer (OTDR) adopts the method for time domain measurement, emission has the light pulse of certain wavelength and injects tested optical fiber, then by the Rayleigh scattering returned in the detection fiber and the Fresnel reflection optical signal power distribution curve along time shaft, can find out the physical characteristics such as the length of tested optical fiber and loss.Simultaneously, utilize the powerful data analysis function of optical time domain reflectometer, can also realize accurately location to the case point in the optical fiber link and fault point; Also can form database in the future operator's on-line monitoring test, be convenient in the maintenance fibre circuit is carried out true of quality and trouble shoot etc.Therefore, utilizing optical time domain reflectometer that detection and location are carried out in the fault point in the fibre circuit and user side, is the test mode that generally adopts at present.But, existing user side module, reflection to the OTDR detection signal of local side on designs does not explicitly call for, device is unfixing and clear and definite to the reflection of OTDR detection signal, therefore accidentalia when the different user end depends on device package fully to its OTDR detection signal reflection power, causes most of monitoring and line fault to judge inaccurate, error is large, the situation such as erroneous judgement often occurs and fail to judge.In order to realize that optical communication network system is carried out Real Time Monitoring, need to adopt the monitoring of OTDR time domain reflection technology and location optical-fiber network breakpoint.In order to realize this technology, traditional approach is to utilize merely traditional optically flat filter to realize the reflection and transmission of multi-wavelength signals.Its shortcoming is that traditional optically flat filter does not converge the ability of light signal.If the filter of reverberation time-domain signal is arranged on the position near optical interface, reflection and the perspective that need to take into account multi-wavelength this moment cause the plated film complexity sharply to increase.If the filter of reverberation time-domain signal is arranged on the position away from optical interface, the light time territory signal energy that is reflected back is with deficiency.
Summary of the invention
The utility model embodiment provides a kind of optical assembly with time domain reflection function, to solve the problem that the optical assembly rate of finished products is low, reliability is low in the prior art, realize improving rate of finished products and the reliability of the optical assembly with time domain reflection function, and dwindle the volume of the optical assembly with time domain reflection function.
The utility model provides a kind of optical assembly with time domain reflection function, comprise: the laser that is used for launching up light, be used for receiving the photodetector of downlink optical signal, the first filter that is used for the reverberation time-domain signal, be used for the second filter of reverberation time domain detection signal and the optical interface that is used for external optical fiber, described the first filter is inclined at described laser, between described photodetector and the described optical interface, one surface of described the first filter is towards described photodetector and described optical interface, another surface of described the first filter is towards described laser, described the second filter is between described the first filter and described photodetector, one surface of described the second filter is curved-surface structure, and described curved-surface structure is towards described the first filter.
The optical assembly with time domain reflection function that the utility model provides, the second filter plate by integrated reflection function to light time territory detection signal in optical assembly, and second filter plate be set to curved-surface structure, the curved-surface structure of the second filter plate has the ability that converges light time territory detection signal, can strengthen the energy of light time territory detection signal back light network, avoided utilizing merely the filter technology on plane to realize the plated film complexity that the reflection and transmission of multi-wavelength signals exists, cost increases, original up and downlink optical signal is subjected to the problem of certain influence, improve rate of finished products and the reliability of the optical assembly with time domain reflection function, and dwindled the volume of the optical assembly with time domain reflection function.
Aforesaid optical assembly with time domain reflection function, the optical axis of described laser and the optical axis of described optical interface are located along the same line, and the angle between the optical axis of described the first filter and described laser is 45 degree.
Aforesaid optical assembly with time domain reflection function, the optical axis of described photodetector is vertical with the optical axis of described laser.
Aforesaid optical assembly with time domain reflection function, described the first filter and described the second filter are the wavelength division multiplexing filter.
Aforesaid optical assembly with time domain reflection function, the subsequent corrosion of described curved-surface structure are 0.5 mm ~ 10mm.
Aforesaid optical assembly with time domain reflection function, preferred subsequent corrosion 1.3 mm-3.7mm.
Aforesaid optical assembly with time domain reflection function, described the second filter is vertical with the optical axis of described photodetector.
Aforesaid optical assembly with time domain reflection function, the wavelength of the uplink optical signal of described laser emission is 1260 nm-1360nm; The wavelength of the downlink optical signal that described photodetector receives is 1480 nm-1500nm; The wavelength of territory detection signal of described light time is 1615 nm-1665nm.
Aforesaid optical assembly with time domain reflection function also comprises metal-back; Described the first filter and described the second filter are arranged in the described metal-back, and described laser, described photodetector and described optical interface are installed on the described metal-back.
Aforesaid optical assembly with time domain reflection function, described photodetector is fixed on the described metal-back by insulating cement.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do one to the accompanying drawing of required use in embodiment or the description of the Prior Art and introduce simply, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation that the utlity model has the optical assembly embodiment of time domain reflection function;
Fig. 2 is the light path principle figure that the utlity model has the optical assembly embodiment of time domain reflection function.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model embodiment clearer, below in conjunction with the accompanying drawing among the utility model embodiment, technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is the structural representation that the utlity model has the optical assembly embodiment of time domain reflection function; Fig. 2 is the light path principle figure that the utlity model has the optical assembly embodiment of time domain reflection function.As depicted in figs. 1 and 2, present embodiment has the optical assembly of time domain reflection function, comprise: the laser 1 that is used for launching up light, be used for receiving the photodetector 2 of downlink optical signal, the first filter 4 that is used for the reverberation time-domain signal, be used for the second filter 3 of reverberation time domain detection signal and the optical interface 5 that is used for external optical fiber, the first filter 4 is inclined at laser 1, between photodetector 2 and the optical interface 5, one surface of the first filter 4 is towards photodetector 2 and optical interface 5, another surface of the first filter 4 is towards laser 1, the second filter 3 is between the first filter 4 and photodetector 2, one surface of the second filter 3 is curved-surface structure, and curved-surface structure is towards the first filter 4.
Particularly, the first filter 4 that present embodiment has in the optical assembly of time domain reflection function has the complete transmission of up light, characteristic to descending light and the whole reflections of light time territory detection signal, light time territory detection signal projects on the first filter 4 via optical interface 5, reflex to the second filter 3 through the first filter 4, again reflexed on the first filter 4 by the second filter 3, reflexed to optical interface 5 by the first filter 4 more at last, and return in the external optical fiber 6 by optical interface 5, and then enter optical-fiber network, in the optical line terminal under transferring to, realize the detection and localization to this optical network unit.
Wherein, the optical axis of the optical axis of laser 1 and optical interface 5 is located along the same line, and the angle between the optical axis of the first filter 4 and laser 1 can be 45 degree.Concrete, up light by laser 1 emission is injected the surface of the first filter 4 with the angles of 45 degree, and its energy incides optical interface 5 after being seen through fully by the first filter 4, enter optical-fiber network by the optical fiber 6 that is external in optical interface 5, and then transfer in the affiliated optical line terminal.Enter downlink optical signal in the optical assembly that present embodiment has time domain reflection function by optical-fiber network, at first incide the surface of the first filter 4, after its energy is reflected fully by the first filter 4, incide the surface of the second filter 3, its energy is transmitted into fully by the second filter 3 and is mapped in the photodetector 2, to realize the accurate reception of 2 pairs of downlink optical signals of photodetector, realize photoelectric converting function.Preferably, the optical axis of the photodetector in the present embodiment 2 is vertical with the optical axis of laser 1.
In addition, consider the light signal that enters photoelectric device by optical interface 5 except the downlink optical signal of optical line terminal emission, also having light time territory detection signal and wavelength is the interference lightwave signal of 1550nm-1560nm.Crosstalk in order to reduce, improve the antijamming capability of photodetector 2, Effective Raise photodetector 2 receives the sensitivity of downlink optical signals, is arranged on the second filter 3 between the first filter 4 and the photodetector 2 and has the characteristic that reflects fully to the complete transmission of descending light, to light time territory detection signal and interference lightwave signal.Disturb lightwave signal to be reflected fully on the surface of the second filter 3, avoid it to be injected in the photodetector 2, to improve the reception conversion accuracy of 2 pairs of downlink optical signals of photodetector.The second filter 3 is that curved-surface structure forms reflecting curved surface towards the surface of the first filter 4, the ability that this reflecting curved surface has reflection and converges.This curved-surface structure is except the shape of reflecting curved surface, and the design of curved-surface structure shape can be according to the needs change, and the subsequent corrosion of the curved-surface structure in the present embodiment is 0.5 mm ~ 10mm, and is preferred, subsequent corrosion 1.3 mm-3.7mm.And the second filter 3 in the present embodiment is vertical with the optical axis of photodetector 2.It is not restriction to its global shape that present embodiment has the second filter 3 that provides in the optical assembly of time domain reflection function, adopts other global shapes, as long as have reflecting curved surface, all belongs to protection range of the present utility model.The first filter 4 in the present embodiment and the second filter 3 preferred wavelength division multiplexing filters that adopt, and optical interface 5 has the public input/output end port of the optical assembly of time domain reflection function as present embodiment, can adopt SC plug-type or LC plug-type, also or in SC/PC tail fiber type or the SC/APC tail fiber type any, to be connected with the light mouth of external network, realize the single fiber bi-directional transfer function.
Further, the wavelength of the uplink optical signal of 1 emission of the laser in the present embodiment is 1260 nm-1360nm; The wavelength of the downlink optical signal that photodetector 2 receives is 1480 nm-1500nm; The wavelength of light time territory detection signal is 1615 nm-1665nm.Concrete, the uplink optical signal of the 1310nm wavelength of laser 1 emission transmits from left to right along horizontal optical axis, through the first filter 4, its energy enters optical interface 5 after being seen through fully by the first filter 4, by entering the exterior light network with the external optical fiber 6 of optical interface 5.Enter 1490nm, the 1550nm of photoelectric device and the light signal of 1650nm wavelength by the exterior light network, incide first the surface of the first filter 4 through optical interface 5 along horizontal optical axis.The energy of 1490nm wavelength light signal is reflected fully by the first filter 5, is through on the second filter 2 surfaces, arriving photodetector 2, realizes reception and conversion to light signal.The second filter 3 all returns the stray light signal beyond the 1490nm wavelength light signal, enters photodetector 2 to prevent it, improves the isolation to crosstalk signal; The energy reflection that simultaneously 1650nm light time territory is detected number after 4 reflections of the first filter, enters exterior light network through optical interface 5 to the first filter 4.The stray light signal of 1550nm is returned optical-fiber network in the lump with 1650nm light time territory detection signal simultaneously.
Further, the optical assembly of present embodiment with time domain reflection function can also comprise metal-back 8; The first filter 4 and the second filter 3 are arranged in the metal-back 8, and laser 1, photodetector 2 and optical interface 5 are installed on the metal-back 8.Preferably, the laser in the present embodiment 1 and photodetector 2 are fixed on the metal-back 8 by insulating cement 7 respectively.
Present embodiment has the optical assembly of time domain reflection function, the second filter plate by integrated reflection function to light time territory detection signal in optical assembly, and second filter plate be set to curved-surface structure, the curved-surface structure of the second filter plate has the ability that converges light time territory detection signal, can strengthen the energy of light time territory detection signal back light network, avoided utilizing merely the filter technology on plane to realize the plated film complexity that the reflection and transmission of multi-wavelength signals exists, cost increases, original up and downlink optical signal is subjected to the problem of certain influence, improve rate of finished products and the reliability of the optical assembly with time domain reflection function, and dwindled the volume of the optical assembly with time domain reflection function.Present embodiment has the optical assembly of time domain reflection function in the optical network unit single-fiber bidirectional photoelectric device various functions of realizing user side, can effectively realize the reflection function of optical time domain reflectometer with light time domain detection signal, compare the optical network unit single-fiber bidirectional photoelectric device of existing user side, have accurate, simple to operate, the cheap characteristics of light time territory detection signal reflection, can make local side the optical network unit user of user side be realized the fault detection capability of in real time accurately on-line monitoring and optical link.
It should be noted that at last: above embodiment only in order to the technical solution of the utility model to be described, is not intended to limit; Although with reference to previous embodiment the utility model is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the utility model.

Claims (10)

1. optical assembly with time domain reflection function, it is characterized in that, comprise: the laser that is used for launching up light, be used for receiving the photodetector of downlink optical signal, the first filter that is used for the reverberation time-domain signal, be used for the second filter of reverberation time domain detection signal and the optical interface that is used for external optical fiber, described the first filter is inclined at described laser, between described photodetector and the described optical interface, one surface of described the first filter is towards described photodetector and described optical interface, another surface of described the first filter is towards described laser, described the second filter is between described the first filter and described photodetector, one surface of described the second filter is curved-surface structure, and described curved-surface structure is towards described the first filter.
2. the optical assembly with time domain reflection function according to claim 1 is characterized in that, the optical axis of described laser and the optical axis of described optical interface are located along the same line, and the angle between the optical axis of described the first filter and described laser is 45 degree.
3. the optical assembly with time domain reflection function according to claim 2 is characterized in that, the optical axis of described photodetector is vertical with the optical axis of described laser.
4. the optical assembly with time domain reflection function according to claim 1 is characterized in that, described the first filter and described the second filter are the wavelength division multiplexing filter.
5. the optical assembly with time domain reflection function according to claim 1 is characterized in that, the subsequent corrosion of described curved-surface structure is 0.5 mm ~ 10mm.
6. the optical assembly with time domain reflection function according to claim 5 is characterized in that, described subsequent corrosion 1.3 mm-3.7mm.
7. the optical assembly with time domain reflection function according to claim 1 is characterized in that, described the second filter is vertical with the optical axis of described photodetector.
8. the optical assembly with time domain reflection function according to claim 1 is characterized in that, the wavelength of the uplink optical signal of described laser emission is 1260 nm-1360nm; The wavelength of the downlink optical signal that described photodetector receives is 1480 nm-1500nm; The wavelength of territory detection signal of described light time is 1615 nm-1665nm.
9. arbitrary described optical assembly with time domain reflection function is characterized in that according to claim 1-8, also comprises metal-back; Described the first filter and described the second filter are arranged in the described metal-back, and described laser, described photodetector and described optical interface are installed on the described metal-back.
10. the optical assembly with time domain reflection function according to claim 9 is characterized in that, described photodetector is fixed on the described metal-back by insulating cement.
CN 201220357009 2012-07-23 2012-07-23 Optical module with optical time domain reflection function Active CN202772894U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102761371A (en) * 2012-07-23 2012-10-31 青岛海信宽带多媒体技术有限公司 Optical component with optical time domain reflection function
CN109525309A (en) * 2018-11-27 2019-03-26 武汉光迅科技股份有限公司 A kind of OTDR combination unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102761371A (en) * 2012-07-23 2012-10-31 青岛海信宽带多媒体技术有限公司 Optical component with optical time domain reflection function
CN109525309A (en) * 2018-11-27 2019-03-26 武汉光迅科技股份有限公司 A kind of OTDR combination unit

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