CN201812068U - Pluggable optical attenuator - Google Patents
Pluggable optical attenuator Download PDFInfo
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- CN201812068U CN201812068U CN2010205068169U CN201020506816U CN201812068U CN 201812068 U CN201812068 U CN 201812068U CN 2010205068169 U CN2010205068169 U CN 2010205068169U CN 201020506816 U CN201020506816 U CN 201020506816U CN 201812068 U CN201812068 U CN 201812068U
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- optical
- attenuator
- photodiode
- optical attenuator
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Abstract
The utility model provides a pluggable optical attenuator, which comprises a photodiode used for monitoring optical signal power, a circuit board, an optical input connector and an optical output connector. The optical input connector is connected with an optical adjustable attenuator via bent non-sensitive optical fibers, and the photodiode is connected with the optical output connector via bent non-sensitive optical fibers. The pluggable optical attenuator is characterized in that the bent non-sensitive optical fibers used for connecting the optical adjustable attenuator with the photodiode are wound by at least one circle. The bent non-sensitive optical fibers between the adjustable attenuator of the pluggable optical attenuator and the photodiode are wound by multiple circles, and the bent non-sensitive optical fibers are elongated so as to avoid influence of mode noise, thereby realizing the effect of stable attenuation.
Description
Technical field
The utility model relates to the optical communication device technical field, particularly a kind of mould noise (modal noise), stable optical attenuator of damping capacity (Attenuation) avoided.
Background technology
In optical communication network, light signal can be exaggerated, multiplexing, route, and can between different fiber segment, pass through.Except amplifieroperation, all these operations have all reduced the luminous power of signal.In a word,, the luminous power of signal must be remained in certain scope, need regulate power like this for signal suitably being amplified and this signal can being detected.In general two kinds of methods of regulating the luminous power of light signal are arranged.First method is the amplification setting that changes optical amplifier, for example, and by regulating pumping laser, the drive current of utmost point pipe; Second method is to be called as the decay that being provided with of variable optical attenuator (voa) parts regulated light signal by adjusting.In practice, second method is wanted the many of economy, because optical attenuator (VOA) is the passive component that only comprises several elements, and general optical amplifier is quite complicated module, it comprises a lot of passive and active parts, such as active and passive special optical fiber, pump laser diode, wavelength division multiplexer, isolator and miscellaneous part.Moreover, and very frequent, optical attenuator (VOA) is a kind of in these parts, and the operating point of regulating this optical amplifier comprises regulates pumping current and optical attenuator (VOA) is provided with.Because the luminous power of the signal in the adjusting optical communication network is usually directed to before the measuring and adjusting point and luminous power afterwards, will be favourable in these two kinds of function combinations to devices.With the most direct method of optical tap and optical attenuator (VOA) combination is with the output optical fibre of optical attenuator (VOA) and the input optical fibre welding of optical tap, or vice versa.Optical attenuator generally is divided into fixed optical attenuator and adjustable optical attenuator.Fixed attenuator carries out the decay of fixed amount to the luminous energy in the light path, generally adopts passive filtering sheet, attenuating fiber, lens or air-gap etc. to realize attenuation function, has the advantage of good temp characteristic, stable performance D, but uses underaction.Adjustable optical attenuator is divided into mechanical type adjustable optical attenuator and cable address formula adjustable optical attenuator again.The mechanical type adjustable optical attenuator is simple in structure, cost is low, but needs manual operation, be difficult for reaching high attenuation accuracy, and cable address formula adjustable optical attenuator precision is higher, itself can be used as independent functional device and uses, and also can be incorporated in the system and use.No matter be mechanical type adjustable optical attenuator and cable address formula adjustable optical attenuator, the manufacture craft of its most devices is all complicated, and volume is bigger, therefore is applied in the light power controller, has also caused common light power controller volume big, uses inconvenient.
Prior art is by being positioned over adjustable attenuator in the SFP connector (SFP), China CN200820205744.7 has disclosed adjustable attenuator and has been positioned over scheme in the SFP connector (SFP), but the light adjustable attenuator that this Chinese patent discloses and the bend-insensitive optical fiber of photodiode are a non junction optical fiber, and this scheme is because the bending length of bend-insensitive optical fiber can not satisfy the stable requirement of damping capacity.
Summary of the invention
The utility model provides a kind of mould noise, stable optical attenuation of damping capacity (Attenuation) avoided.
In order to realize avoiding mould noise, damping capacity (Attenuation) to stablize, a kind of pluggable optical attenuator of the utility model comprises the photodiode that is used for the monitor optical signal power, circuit board, light input connector and light out connector; Adopt bend-insensitive optical fiber to connect between described smooth input connector and the described smooth adjustable attenuator, between described photodiode and the described smooth out connector; It is characterized in that: the bend-insensitive optical fiber that is used to connect described smooth adjustable attenuator and described photodiode twines a circle at least.
Wherein, preferred version is: described circuit board is provided with pickup groove, and ccontaining described fiber turns is in wherein.
Wherein, preferred version is: described adjustable optical attenuator adopts micro electronmechanical process technology preparation.
Wherein, preferred version is: described smooth input connector, light out connector adopt standard SC or FC structure.
Advantage of the present utility model is: twine at least one circle because the adjustable attenuator of the pluggable optical attenuator of the utility model and the bend-insensitive optical fiber between the described photodiode adopt, in limited SFP connector (SFP) structure space, prolong the length of bend-insensitive optical fiber, thereby avoid the influence of mould noise to realize the stable effect of damping capacity.
Description of drawings
Below in conjunction with drawings and Examples light channel structure of the present utility model is further specified.
Fig. 1 is the structure principle chart of first embodiment of the pluggable optical attenuator of the utility model.
Fig. 2 is the structure principle chart of second embodiment of the pluggable optical attenuator of the utility model.
Fig. 3 is the curve map that the pluggable optical attenuator of the utility model connects the bend-insensitive optical fiber different length damping capacity in time of light adjustable attenuator and described photodiode.
Embodiment
Be described further below in conjunction with the principle of work of accompanying drawing the pluggable optical attenuator of the utility model.
Fig. 1 is the first embodiment light channel structure figure of the pluggable optical attenuator of the utility model, as shown in Figure 1: described pluggable optical attenuator 1 comprises that input connector 11 twines two circles by bend-insensitive optical fiber 10 around optical fiber duct 12 and is fixed in the optical fiber duct 12, in the laggard light inlet adjustable attenuator 13, enter the photodiode 14 of optical power monitoring from light adjustable attenuator 13 by bend-insensitive optical fiber 10 again, enter light output end connector 15 from optical power monitoring photodiode 14 by bend-insensitive optical fiber 10 at last.Input connector 11, out connector 15 are connected with extraneous input connector 111, extraneous out connector 151 respectively, in light adjustable attenuator 13 and the optical power monitoring photodiode 14 Access Control circuit boards 16.Light adjustable attenuator 13 adopts micro electronmechanical process technology preparation, can add the loss that thereon voltage changes luminous power in the optic fibre light path by change, optical power monitoring photodiode 14 can monitor the variation of luminous power in the light path, control circuit board 16 is adjusted the voltage of light adjustable attenuator 13 according to the feedback of monitor photo-diode 14, thereby realizes the luminous power in control and the stable light path.
The principle of work of present embodiment is: input connector 11 and outside input connector 111, out connector 15 and outside out connector 151 can not be accurately on time, because optical fiber 10 comprises fibre core and covering and forms, the luminous energy of part loss will transmit and enter in the covering, form cladding mode, fibre core transmits the LP10 mould like this, covering transmission LP11 mould, the LP11 mould is unstable cover half like this, if fiber lengths is not enough, can not obtain good restraining, be coupled into output optical fibre once more and change into the LP10 mould, thereby cause the output light-wave reason and produce the mould noise, owing to pass through the structure around a fine circle of bend-insensitive optical fiber 10 in the present embodiment, increased the length of bend-insensitive optical fiber 10, and the mould noise that produces can be inhibited in the Optical Fiber Transmission process by sufficient length, and the effect of present embodiment can be by the curve B checking as Fig. 3.
Fig. 2 is the second embodiment light channel structure figure of the pluggable optical attenuator of the utility model, as shown in Figure 2: described pluggable optical attenuator 2 comprises that input connector 21 twines eight circles by bend-insensitive optical fiber 20 around optical fiber duct 22 and is fixed in the optical fiber duct 22, in the laggard light inlet adjustable attenuator 23, enter the photodiode 24 of optical power monitoring from light adjustable attenuator 23 by bend-insensitive optical fiber 20 again, enter light output end connector 25 from optical power monitoring photodiode 24 by bend-insensitive optical fiber 20 at last.Described input connector 21, out connector 25 are connected with extraneous input connector 211, extraneous out connector 251 respectively, in described smooth adjustable attenuator 23 and the optical power monitoring photodiode 24 Access Control circuit boards 26.Light adjustable attenuator 23 adopts micro electronmechanical process technology preparation, can add the loss that thereon voltage changes luminous power in the optic fibre light path by change, optical power monitoring photodiode 24 can monitor the variation of luminous power in the light path, control circuit board 26 is adjusted the voltage of light adjustable attenuator 23 according to the feedback of monitor photo-diode 24, thereby realizes the luminous power in control and the stable light path.
The principle of work of present embodiment is: described input connector 21 and extraneous input connector 211, out connector 25 and extraneous out connector 251 can not be accurately on time, because optical fiber 20 comprises fibre core and covering and forms, the luminous energy of part loss will transmit and enter in the covering, form cladding mode, fibre core transmits the LP10 mould like this, covering transmission LP11 mould, and the LP11 mould is unstable cover half, if fiber lengths is not enough, can not obtain good restraining, be coupled into output optical fibre once more and change into the LP10 mould, thereby cause the output light-wave reason and produce the mould noise, owing to pass through the structure around fine multi-turn of bend-insensitive optical fiber 10 in the present embodiment, increased the length of bend-insensitive optical fiber 20, and the mould noise that produces can be inhibited in the Optical Fiber Transmission process by sufficient length, and the effect of present embodiment can be by the curve C checking as Fig. 3.
Fig. 3 is the curve map that the pluggable optical attenuator of the utility model connects the bend-insensitive optical fiber different length damping capacity in time of light adjustable attenuator and described photodiode, as shown in Figure 3: horizontal ordinate is time (t), ordinate is damping capacity (dB), wherein, length is big as curve A among Fig. 3 less than damping capacity (dB) (t) variation in time of the optical fiber of 30mm, length is that damping capacity (dB) (t) variation in time of the optical fiber of 75mm is less as curve B among Fig. 3, length is that damping capacity (dB) (t) variation in time of 250mm optical fiber is littler of curve C among Fig. 3, be not difficult to find out, the damping capacity (dB) that the length of bend-insensitive optical fiber is long is more stable, extend to the utility model at existing fixed space around the number of turns of optical fiber in the length that has to a certain degree increased optical fiber, thereby stabilising decay amount (dB).
The utility model not only is confined to pitch of the laps 2 to 8 circle, eliminates the mould noise in order to reach, and realizes the effect of stabilising decay amount by pitch of the laps on can the basis of small-scale structure.
The advantage that the utlity model has like this is: twine at least one circle because the adjustable attenuator of the pluggable optical attenuator of the utility model and the bend-insensitive optical fiber between the described photodiode adopt, in limited SFP connector (SFP) structure space, prolong the length of bend-insensitive optical fiber, thereby avoid the influence of mould noise to realize the stable effect of damping capacity.
The above person is the utility model most preferred embodiment only, is not to be used to limit scope of the present utility model, and all equivalences of being done according to the utility model claim change or modify, and are all the utility model and contain.
Claims (5)
1. a pluggable optical attenuator comprises the photodiode that is used for the monitor optical signal power, circuit board, light input connector and light out connector; Adopt bend-insensitive optical fiber to connect between described smooth input connector and the described smooth adjustable attenuator, between described photodiode and the described smooth out connector; It is characterized in that: the bend-insensitive optical fiber that is used to connect described smooth adjustable attenuator and described photodiode twines a circle at least.
2. pluggable optical attenuator according to claim 1 is characterized in that: described circuit board is provided with pickup groove, and ccontaining described fiber turns is in wherein.
3. pluggable optical attenuator according to claim 1 and 2 is characterized in that: described adjustable optical attenuator adopts micro electronmechanical process technology preparation.
4. pluggable optical attenuator according to claim 1 and 2 is characterized in that: described smooth input connector, light out connector adopt standard SC structure.
5. pluggable optical attenuator according to claim 1 and 2 is characterized in that: described smooth input connector, light out connector adopt the standard FC structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205068169U CN201812068U (en) | 2010-08-26 | 2010-08-26 | Pluggable optical attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205068169U CN201812068U (en) | 2010-08-26 | 2010-08-26 | Pluggable optical attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201812068U true CN201812068U (en) | 2011-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205068169U Expired - Fee Related CN201812068U (en) | 2010-08-26 | 2010-08-26 | Pluggable optical attenuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201812068U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914505A (en) * | 2015-06-30 | 2015-09-16 | 北极光电(深圳)有限公司 | Pluggable and monitorable variable optical attenuator |
| JP2019095483A (en) * | 2017-11-17 | 2019-06-20 | 富士通オプティカルコンポーネンツ株式会社 | Optical communication apparatus |
| CN113805285A (en) * | 2020-06-16 | 2021-12-17 | 青岛海信宽带多媒体技术有限公司 | Optical module |
-
2010
- 2010-08-26 CN CN2010205068169U patent/CN201812068U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914505A (en) * | 2015-06-30 | 2015-09-16 | 北极光电(深圳)有限公司 | Pluggable and monitorable variable optical attenuator |
| CN104914505B (en) * | 2015-06-30 | 2018-02-13 | 北极光电(深圳)有限公司 | A kind of pluggable and monitoring adjustable optical attenuator |
| JP2019095483A (en) * | 2017-11-17 | 2019-06-20 | 富士通オプティカルコンポーネンツ株式会社 | Optical communication apparatus |
| JP7056092B2 (en) | 2017-11-17 | 2022-04-19 | 富士通オプティカルコンポーネンツ株式会社 | Optical communication device |
| CN113805285A (en) * | 2020-06-16 | 2021-12-17 | 青岛海信宽带多媒体技术有限公司 | Optical module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: O-Net Information Technology (Shenzhen) Co.,Ltd. Document name: Notification to Pay the Fees |
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| DD01 | Delivery of document by public notice |
Addressee: O-Net Information Technology (Shenzhen) Co.,Ltd. Document name: Notification of Termination of Patent Right |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110427 Termination date: 20140826 |
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| EXPY | Termination of patent right or utility model |