CN107888283A - High-isolation and high return loss two-port light retroreflector - Google Patents
High-isolation and high return loss two-port light retroreflector Download PDFInfo
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- CN107888283A CN107888283A CN201610866278.6A CN201610866278A CN107888283A CN 107888283 A CN107888283 A CN 107888283A CN 201610866278 A CN201610866278 A CN 201610866278A CN 107888283 A CN107888283 A CN 107888283A
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- 238000002955 isolation Methods 0.000 title claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract 3
- 239000013307 optical fiber Substances 0.000 claims description 24
- 230000003287 optical effect Effects 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 7
- 238000005538 encapsulation Methods 0.000 claims 2
- 238000013461 design Methods 0.000 description 12
- 230000006872 improvement Effects 0.000 description 10
- 230000001419 dependent effect Effects 0.000 description 4
- 238000002592 echocardiography Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
Abstract
Disclose a kind of high-isolation and high return loss two-port light retroreflector.The number that this retroreflector is designed to be filtered using the one or more wave filters increase light exclusively set, so as to increase isolation and return loss.The two-port light retroreflector includes：First port, the first port are used to receive the input signal for including the first signal and secondary signal；Second port；First wave filter, first wave filter are designed to transmit first signal and reflect the secondary signal；Reflector；And lens, the input signal is directed to transmission first signal and reflects first wave filter of the secondary signal by the lens, reflector described in the first signal directive being wherein transmitted, to cause before the first signal reflected is advanced to the second port, the first signal reflected again passes by first wave filter；And the secondary signal reflected is coupled to the first port.
Description
The cross reference of related application
This application claims entitled " High Isolation and High Return Loss 2-Port Optical
The U.S. Provisional Application No.62/122 that Retro-Reflector ", on October 16th, 2014 submit, 224 rights and interests, herein in order to
All purposes is by reference to the provisional application is incorporated herein.
Technical field
The present invention relates generally to optical communication field.Especially, the present invention relates to high-isolation (isolation) and high echo
(return loss) two-port light retroreflector is lost.
Background technology
In optical-fiber network, it is important that carrying out monitoring system operation with OTDR (optical time domain reflectometer), so as to detect
Any possible damage or problem in network.Before, people inquire into and are deployed in extensively the OTDR monitoring in optical-fiber network, such as beautiful
State's patent 2012/0134663.Meanwhile fast development is intelligent network to optical-fiber network at present, has more functional layers and complexity
Multidimensional structure, and thus the demand of the monitoring to OTDR signal performances and feedback function is continuously increased.
In the case of multitiered network structure, because each layer is required for superposed signal one by one and thus any undesirable
Return signal will be unfavorable, can deteriorate signal to noise ratio, therefore high-isolation and high return loss demand are inevitably critically important.
Moreover, PON (NGPON) of future generation is being advanced to the last one kilometer in other, and for optical-fiber network such as FTTX (light
Fibre can provide the premium grade (premium of OTDR functions for multi-layer intelligent network to faster speed x) is transitted to
Grade) retroreflector plays an important role and by active demand.
The disclosure is taught has high-isolation and in retroeflection for the data-signal transmitted
There is the exclusive device of high return loss, to meet the premium grade retroreflector demand in multi-layer intelligent network in OTDR signals.
The content of the invention
The purpose of this part is to summarize some aspects of the present invention and briefly introduce some preferred embodiments.It may carry out
Simplify or omit with the purpose of this part of avoiding confusion.This simplification or omission are not intended to limit the scope of the present invention.
Generally, the present invention relates to the two-port light retroreflector with high-isolation and high return loss.According to the present invention
One side, device be designed to by using the one or more wave filters exclusively set come increase light filtering time
Number, thus increase isolation and return loss.
The present invention can be implemented as single device, method and partial system.According to an embodiment, the present invention is
Two-port light retroreflector, the two-port light retroreflector include：First port, the first port, which is used to receive, includes the first letter
Number and secondary signal input signal；Second port；It is designed to transmit first signal and reflects the secondary signal
First wave filter；Reflector；And lens, the lens guide the input signal to transmiting first signal and reflect institute
First wave filter of secondary signal is stated, wherein reflector described in the first signal directive being transmitted, reflected
The first signal advanced to the second port before, the first signal for being reflected again passes by first wave filter, and by
The secondary signal of reflection is coupled to the first port.Dependent on performance, the reflector can be minute surface or
Two wave filters.First wave filter is consistent (identical) in optical characteristics with second wave filter.
According to another embodiment, the present invention is two-port light retroreflector, and the two-port light retroreflector includes：First end
Mouthful, the first port is used to receive the input signal for including the first signal and secondary signal；Second port；It is designed to transmit
First signal and the first wave filter for reflecting the secondary signal；The input signal is directed to by lens, the lens
Transmit first signal and reflect first wave filter of the secondary signal, wherein, the first signal being transmitted is by coupling
The second port is bonded to, the secondary signal reflected is coupled to following device：Described device includes：Single fiber tail optical fiber
(single fiber pigtail)；Lens；With the second wave filter, wherein the secondary signal reflected passes through the single fiber tail
Second wave filter described in fine and described lens directive.
Once being detailed description below for embodiment of the present invention, other objects of the present invention, feature are consulted with reference to accompanying drawing
It will become obvious with advantage.
Brief description of the drawings
With reference to be described below, appended claims and accompanying drawing, these and other for being better understood the present invention are special
Sign, aspect and advantage, in the accompanying drawings：
Fig. 1 shows the structure that retroreflector is coupled between two connectors；
Fig. 2 shows the exemplary embodiment according to an embodiment of the invention；
Fig. 3 A show the design with all band input optical signal by COM port (communication port) optical fiber,
Data-signal is from filter reflection, OTDR signals device and afterwards by mirror-reflection after filtering；
Fig. 3 B show the improvement to Fig. 3 A：Minute surface is changed to film filter；
Fig. 3 C show the improvement to Fig. 3 A：By in small tube use four optical fiber pigtails improve FPDP every
From degree；
Fig. 3 D are shown replaces improvement of the minute surface to Fig. 3 C by using wave filter 312.In the light path and Fig. 3 C that pass through
Definite (exactly) is identical in path；
Fig. 4 A show the device made of two mini tubes, wherein, two mini tubes are engaged
(spliced) to together to realize high-isolation in FPDP and realize high return loss in the COM ports of retroeflection；
Fig. 4 B are shown to be changed by the way that the second filters in series is added into another wave filter with obtaining double filtering to Fig. 4 A
Enter；
Fig. 4 C are shown replaces improvement of the minute surface to Fig. 4 A by using film filter；
Fig. 4 D are shown replaces improvement of the minute surface to Fig. 4 B by using film filter；
Fig. 5 A-5D show the design respectively in Fig. 4 A- Fig. 4 D each in four optical fiber pigtails use；And
Fig. 6 shows that the box body for encapsulating all parts shown in preceding accompanying drawing designs.
Embodiment
In the following description, a large amount of details are illustrated to provide thorough understanding of the present invention.But to art
Technical staff is evident that, it may be unnecessary to which these details put into practice the present invention.Description and presentation herein be
The art experienced person generic way that either technical staff uses, their work is substantially most effectively passed
Up to giving art others skilled in the art.In other cases, do not specifically describe known method, process, component and circuit with
Avoid unnecessarily obscuring the aspect of the present invention.
" embodiment " referred to herein or " embodiment " refer to the specific spy for combining embodiment description
Sign, structure or characteristic may include at least one embodiment of the present invention.Occur in each position of this specification short
Language " in one embodiment " need not all refer to identical embodiment, nor exclude other embodiment separation each other or
The embodiment of replacement.Moreover, block in process chart or the accompanying drawing of the one or more embodiments of the presentation present invention
(block) order is not inherently to represent any particular order, does not imply that any limitation of the invention yet.
Embodiments of the present invention are discussed herein with reference to Fig. 2-6.But one of ordinary skill in the art will readily appreciate that,
Because the present invention extend beyond these limited embodiments, therefore the specific descriptions provided herein in regard to these accompanying drawings are to use
In illustrative purpose.
In order to provide the scheme for high-isolation and high return loss, this document describes a kind of two-port light retroreflector.
Referring now to accompanying drawing, similar part is referred to using similar numeral through several accompanying drawings.Fig. 1 shows structure 100, is tying
Retroreflector 102 is coupling between two connectors 104 and 106 in structure 100, wherein, connector 104 is by the coupling of input optical signal 108
The input of retroreflector 102 is closed, and the output of retroreflector 102 is coupled to connector 106.In operation, input signal is worked as
When some or all of 108 are transmitted via retroreflector 102, signal 112 be returned or reflection passes through the only of retroreflector 102
There is design to be minimized.
Fig. 2 shows the exemplary embodiment according to one embodiment of the present invention 200.Device includes two ports
201 and 203, its middle port 201 be also referred to as COM port or COM port optical fiber, and port 203 be referred to as FPDP or
FPDP optical fiber.In operation, input signal (light) is coupled to COM port and via double directive lens of optical fiber pigtail 208
210.Then input signal hits optical filter 202 (such as film filter).Optical filter 202 is designed to by determining ripple
Long signal, while reflect other signals.The signal for being transmitted or passing through is reflected by reflector 212.Dependent on performance, instead
Emitter 212 can be minute surface either other optical filters.So that thus the signal passed through increases again by wave filter 202
Big isolation.FPDP 203 is directed to by the signal after the secondary filtering of wave filter 202.Meanwhile reflected by wave filter 202
Signal be directed to designated port.As two-port device, the signal reflected is directed to COM port 201.Following article institute
State, the signal passed through exported from FPDP 203 is referred to as data-signal, and the signal reflected is believed referred to as OTDR
Number.
In the industry cycle it is generally known that the intrinsic reflection isolation degree of film filter coating is only capable of offer≤20dB, and thus
In Fig. 2 is only≤40dB by (pass-through) isolation.In order to increase isolation and return loss, mini pipe is used
Multiple reflections and multipass (pass- through) in shape structure are with meet demand.It should be noted that in description herein,
OTDR signals are also referred to as retroreflective signs, and data-signal also referred to as passes through signal.Dependent on performance, using can be by not
The various wavelength combinations realized with film coating, actual device can be very multi-functional.For example, input signal carries OTDR
Signal (1630-1670nm) and data-signal (1260-1618nm), data-signal is needed by device 200, while OTDR needs
It is reflected back toward the input COM port of device 200.In the case where not meaning that any restrictions, dependent on wave filter, data-signal
Can be the signal reflected, OTDR signals can also be the signal passed through.
Referring now to Fig. 3 A, Fig. 3 A are shown with all band (such as 1260-1670nm) by COM port optical fiber
The design of input optical signal, from the reflectance data signal (such as 1260-1618nm) of wave filter 302, OTDR signals (such as 1630-
1670nm) device 302 after filtering, are then specularly reflected.The OTDR signals reflected afterwards again pass by wave filter 302 and returned
To COM optical fiber, as retroreflective signs (retro signal).By this structure, estimate in the OTDR 80dB for retroeflection
Data-signal, high return loss 80dB can be realized, but FPDP isolation is only 20dB.
Fig. 3 B show the improvement to Fig. 3 A：Make minute surface into film filter, for present embodiment, because data are believed
Number pass twice through wave filter 302 and reflected once by wave filter 312, therefore the echo damage of the data-signal of COM port is returned in retroeflection
Consumption can bring up to 100dB, meanwhile, data ports signal isolation is maintained as 20dB.Thus, in retroeflection COM port (retro
COM port) in, present embodiment has 20dB FPDPs isolation and 100dB data-signal return losses.
Fig. 3 C show the improvement to Fig. 3 A：By improving FPDP using four optical fiber pigtails in small tube
Isolation.The light path passed through is definitely identical with Fig. 3 B, but be so that the data-signal reflected from wave filter 302 to return
Another optical fiber of four optical fiber pigtails 308 is marched to, and second secondary reflection is used as by reflection from wave filter 302, thus, passes through this
Bireflectance (having 20dB isolations per secondary reflection) enhances FPDP isolation, and this design for FPDP
Final isolation is 40dB.Thus, in retroeflection COM port, the design in Fig. 3 C have 40dB FPDPs isolation and
80dB data-signal return losses.
Fig. 3 D show the improvement to Fig. 3 C：Minute surface is substituted for wave filter 312.The light path passed through and the road in Fig. 3 C
Footpath is definitely identical.The light path of reflection is definitely identical with the path in Fig. 3 B.Thus, in retroeflection COM port, setting in Fig. 3 D
Meter has 40dB FPDPs isolation and 100dB data-signal return losses.
Referring now to Fig. 4 A, Fig. 4 A show the device made of two mini tube 401 and 403.The two fans
Your tube 401 and 403 is joined together to realize high-isolation in FPDP and be realized in retroeflection COM port
High return loss.As shown in Figure 4 A, the data-signal FPDP that device 302 and entrance isolation are 40dB after filtering,
OTDR signals are reflected on wave filter 302 and are output to COM port side from double filter, are filled afterwards into single fiber tubulose
Put 303.This OTDR signal is specularly reflected and enters wave filter 302 to reversion again, and COM port is returned in final retroeflection.Pass through
This structure, in retroeflection COM port, present embodiment has 40dB FPDPs isolation and 40dB data-signal echoes
Loss.
Fig. 4 B are shown by the way that the second wave filter 305 is connected added to wave filter 302 to obtain double filtering to Fig. 4 A's
Improve, data-signal passes twice through wave filter 302 to strengthen isolation, and OTDR signal paths are definitely identical with Fig. 4 A.By
This, in retroeflection COM port, the design in Fig. 4 B has 80dB FPDPs isolation and 40dB data-signal return losses.
Fig. 4 C are shown replaces improvement of the minute surface to Fig. 4 A by using film filter 302, so for data-signal,
Enhanced 20dB parasitic echoes are lost OTDR signals, meanwhile, data-signal will pass through definite phase in wave filter 302, with Fig. 4 A
Together.Thus, in retroeflection COM port, the design in Fig. 4 C has 40dB FPDPs isolation and 60dB data-signal echoes
Loss.
Fig. 4 D are shown replaces improvement of the minute surface to Fig. 4 B by using film filter 302, so for data-signal,
Enhanced 20dB parasitic echoes are lost OTDR signals, while data-signal passes twice through wave filter 302, with definite phase in Fig. 4 B
Together.Thus, in retroeflection COM port, the design has 80dB FPDPs isolation and 60dB data-signal return losses.
Fig. 5 A- Fig. 5 D show the design respectively in Fig. 4 A- Fig. 4 D each in four optical fiber pigtails use.As above
What text was explained, this four optical fiber pigtail is introduced for increasing isolation, realizes the 40dB numbers in Fig. 5 A retroeflection COM port
According to interport isolation and 80dB data-signal return losses, in Fig. 5 B retroeflection COM port 80dB FPDPs isolation and
80dB data-signal return losses, 40dB FPDPs isolation and 100dB data-signals return in Fig. 5 C retroeflection COM port
Ripple is lost, and 80dB FPDPs isolation and 100dB data-signal return losses in Fig. 5 D retroeflection COM port.
For integrality, Fig. 6 shows that the box body for encapsulating all parts shown in preceding accompanying drawing designs.One
In individual embodiment, all parts are encapsulated in small-sized durable box body, and this small-sized durable box body has 2mm sheaths (jacket)
The cable of protection, for the deployment under all difficulties environment.
The present invention fully describe in detail by a certain degree of special case.One of ordinary skill in the art should manage
Solution, the description of the disclosure of embodiment of the present invention has been carried out only by means of example, in the arrangement of some and combination side
Face can take a variety of changes without departing from the spirit and scope of the present invention as claimed.For example, variable Midst density filter
Another device that ripple device can be strengthened optical signal replaces.Therefore, it is intended that the scope of the present invention be defined by the claims appended hereto rather than
Limited by embodiments described above.
Claims (17)
1. a kind of two-port light retroreflector, the two-port light retroreflector includes
First port, the first port are used to receive the input signal for including the first signal and secondary signal；
Second port；
First wave filter, first wave filter are designed to transmit first signal and reflect the secondary signal；
Reflector；With
The input signal is directed to transmission first signal and reflected described in the secondary signal by lens, the lens
First wave filter, wherein reflector described in the first signal directive being transmitted, to cause in the first signal reflected to described
Before second port is advanced, the first signal reflected again passes by first wave filter；And the secondary signal reflected
It is coupled to the first port.
2. two-port light retroreflector as claimed in claim 1, wherein the reflector is one of the second wave filter and minute surface.
3. two-port light retroreflector as claimed in claim 2, wherein second wave filter in terms of optical characteristics with it is described
First wave filter is consistent.
4. two-port light retroreflector as claimed in claim 3, wherein the reflector is second wave filter, it is transmitted
First signal is filtered again by second wave filter, realizes repeatedly filtering to increase first signal relative to described second
The isolation of signal.
5. two-port light retroreflector as claimed in claim 1, in addition to：
Double optical fiber pigtails for the first port and the second port.
6. two-port light retroreflector as claimed in claim 5, wherein the first port is COM port, the second port
It is FPDP.
7. two-port light retroreflector as claimed in claim 1, in addition to：
Four optical fiber pigtails, two therein are used for the first port and the second port, and two are used to form loop, will
The secondary signal reflected is back to first wave filter for another filtering to return, to increase reflected second
Return loss in signal.
8. two-port light retroreflector as described in claim 1, wherein the two-port light retroreflector is in durable box body
Encapsulation, the durable box body have 2mm sheaths protect cable, for the deployment under all difficulties environment.
9. two-port light retroreflector as claimed in claim 1, wherein the first port and the second port are all set
On the side of the durable box body, and it is encapsulated in the cable of the 2mm sheaths protection.
10. a kind of two-port light retroreflector, the two-port light retroreflector includes：
First port, the first port are used to receive the input signal for including the first signal and secondary signal；
Second port；
First wave filter, first wave filter are designed to transmit first signal and reflect the secondary signal；
The input signal is directed to transmission first signal and reflected described in the secondary signal by lens, the lens
First wave filter, wherein the first signal being transmitted is coupled to the second port, the secondary signal reflected is coupled to
Following device：The device includes：
Single fiber tail optical fiber；
Lens；With
Second wave filter,
The secondary signal wherein reflected is via the second wave filter described in the single fiber tail optical fiber and the lens directive.
11. two-port light retroreflector as claimed in claim 10, wherein second wave filter is in terms of optical characteristics and institute
It is consistent to state the first wave filter.
12. two-port light retroreflector as claimed in claim 11, wherein the secondary signal reflected is by second wave filter
Filter again, to realize repeatedly filtering to increase the return loss of the secondary signal.
13. two-port light retroreflector as claimed in claim 1, in addition to for the first port and the second port
Double optical fiber pigtails.
14. two-port light retroreflector as claimed in claim 10, wherein the first port is COM port, second end
Mouth is FPDP.
15. two-port light retroreflector as claimed in claim 10, in addition to：
Four optical fiber pigtails, two therein are used for the first port and the second port, and two are used to form loop, will
The secondary signal reflected is back to first wave filter for another filtering to return, is reflected further to increase
Secondary signal in return loss.
16. two-port light retroreflector as claimed in claim 10, wherein the two-port light retroreflector is in durable box body
Encapsulation, the durable box body have 2mm sheaths protect cable, for the deployment under all difficulties environment.
17. two-port light retroreflector as claimed in claim 10, wherein the first port and the second port are all set
Put on the side of the durable box body, and be encapsulated in the cable of the 2mm sheaths protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610866278.6A CN107888283A (en) | 2016-09-29 | 2016-09-29 | High-isolation and high return loss two-port light retroreflector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610866278.6A CN107888283A (en) | 2016-09-29 | 2016-09-29 | High-isolation and high return loss two-port light retroreflector |
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| CN107888283A true CN107888283A (en) | 2018-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610866278.6A Pending CN107888283A (en) | 2016-09-29 | 2016-09-29 | High-isolation and high return loss two-port light retroreflector |
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|---|---|---|---|---|
| US20030077044A1 (en) * | 2001-10-19 | 2003-04-24 | Fujitsu Limited | Optical multiplexer/demultiplexer module and production method therefor |
| US20070230867A1 (en) * | 2006-04-04 | 2007-10-04 | Jds Uniphase Corporation | Tunable optical add/drop multiplexer |
| CN101900855A (en) * | 2009-05-27 | 2010-12-01 | 泰科电子(上海)有限公司 | Optical fiber filter device and manufacture method thereof |
| US7912374B1 (en) * | 2004-09-30 | 2011-03-22 | Alliance Fiber Optic Products, Inc. | High isolation wavelength division devices |
| CN102621635A (en) * | 2012-04-10 | 2012-08-01 | 北京交通大学 | Optical fiber isolator based on blazed fiber bragg gratings |
-
2016
- 2016-09-29 CN CN201610866278.6A patent/CN107888283A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030077044A1 (en) * | 2001-10-19 | 2003-04-24 | Fujitsu Limited | Optical multiplexer/demultiplexer module and production method therefor |
| US7912374B1 (en) * | 2004-09-30 | 2011-03-22 | Alliance Fiber Optic Products, Inc. | High isolation wavelength division devices |
| US20070230867A1 (en) * | 2006-04-04 | 2007-10-04 | Jds Uniphase Corporation | Tunable optical add/drop multiplexer |
| CN101900855A (en) * | 2009-05-27 | 2010-12-01 | 泰科电子(上海)有限公司 | Optical fiber filter device and manufacture method thereof |
| CN102621635A (en) * | 2012-04-10 | 2012-08-01 | 北京交通大学 | Optical fiber isolator based on blazed fiber bragg gratings |
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Application publication date: 20180406 |