CN110661567A

CN110661567A - Optical one-way tap monitoring device

Info

Publication number: CN110661567A
Application number: CN201810695182.7A
Authority: CN
Inventors: 吕海峰; 范鸿俊; 黄文辉; 徐燕
Original assignee: Opple Link Network Communications Usa Division Ltd; Zhuhai Free Trade Zone Optical Union Communication Technology Co Ltd
Current assignee: Opple Link Network Communications Usa Division Ltd; Zhuhai Free Trade Zone Optical Union Communication Technology Co Ltd
Priority date: 2018-06-29
Filing date: 2018-06-29
Publication date: 2020-01-07
Anticipated expiration: 2038-06-29
Also published as: CN110661567B

Abstract

The invention provides an optical one-way tap monitoring device. The optical one-way tap monitoring device comprises an input waveguide, an output waveguide, a first lens, a second lens, a tap element, an optical detection chip, a shading element and a sealing sleeve. The incident surface of the first lens is arranged to face the input waveguide and the output waveguide. The incident surface of the second lens faces the exit surface of the first lens. A tap element is disposed between the first lens and the second lens, the tap element transmitting a portion of the optical signal from the input waveguide and reflecting another portion of the optical signal to the output waveguide. The light detection chip faces an exit surface of the second lens, and the second lens causes the light signal from the input waveguide to be projected on the light detection chip. The light blocking member blocks reverse light from the output waveguide. The sealing sleeve is sleeved on the peripheries of the input waveguide, the output waveguide, the first lens, the second lens and the optical detection chip. The optical one-way tap monitoring device is small in size and ensures isolation.

Description

Optical one-way tap monitoring device

Technical Field

The invention relates to the technical field of optical fiber communication, in particular to an optical one-way tap monitoring device.

Background

Since many optical modules need to monitor power of each node. Theoretically, signal light needs to be branched into one branch to be connected with a power monitoring device, so that power monitoring of the node is achieved. An optical Unidirectional Tap Monitor (UTMS) is an independent device that can implement this function. With the trend of integration and miniaturization of devices and modules, the size of each device inevitably becomes an important matter of module design consideration.

Chinese patent CN100501477 discloses an optical tap module in which the photodiode is housed within a cylindrical package structure. The package structure is a can-shaped coaxial package that limits the optical tap module from shrinking in size. Moreover, a finished power detector is usually provided with a focusing lens, resulting in a larger outer diameter of the package structure, which becomes one of the size constraints of the optical tap module. And the reverse light in the optical tap module is subjected to diffuse reflection in the package, wherein a part of the reverse light can be received by the photodiode, so that the isolation of the optical tap module is reduced. Thus, existing designs are subject to further improvement.

Disclosure of Invention

The invention aims to provide an optical one-way tap monitoring device which is small in size and beneficial to improving isolation.

An optical unidirectional tap monitoring device comprising:

an input waveguide for inputting an optical signal;

an output waveguide for outputting an optical signal, said input waveguide being spaced from and arranged parallel to said output waveguide;

a first lens for collimating the optical signal emitted from the input waveguide, an incident surface of the first lens being arranged to face the input waveguide and the output waveguide, and another end surface of the first lens being an exit surface;

the incident surface of the second lens faces the emergent surface of the first lens, and the other end surface of the second lens is an emergent surface;

a tap element disposed between said first lens and said second lens, said tap element for transmitting a portion of said optical signal from said input waveguide and reflecting another portion of said optical signal to said output waveguide;

a light detection chip facing the exit face of the second lens, wherein the second lens causes the light signal from the input waveguide to be projected onto the light detection chip and causes the backward light from the output waveguide to be directed away from the light detection chip;

a shading element partially covering the exit surface of the second lens and used for shading the backward light from the output waveguide;

and the sealing sleeve is sleeved on the peripheries of the input waveguide, the output waveguide, the first lens, the second lens and the optical detection chip.

In one embodiment, the shading element is formed by a coating of light absorbing material or a coating of light reflecting material.

In one embodiment, the light shielding element is configured to cover a half area of the exit surface of the second lens.

In one embodiment, the incident surface of the first lens and the exit surface of the second lens are inclined surfaces.

In one embodiment, the tap element is a partially transmissive film layer disposed on the exit face of the first lens.

In one embodiment, the optical fiber module further includes an optical fiber head, the input waveguide and the output waveguide are fixed to the optical fiber head, and the optical fiber head is opposite to the incident surface of the first lens and sealed in the sealed sleeve.

In one embodiment, a collar is disposed outside a joint of the first lens and the optical fiber head, and the collar fixes the first lens and the optical fiber head to the sealing sleeve.

In one embodiment, the light detecting chip is fixed on a chip base and has no external packaging can.

In one embodiment, the chip base and the sealing sleeve are hermetically connected through a sealant.

An optical unidirectional tap monitoring device comprising:

an input waveguide for inputting an optical signal;

a light detection chip fixed on a chip base and having no external packaging can, the light detection chip bare on the emergent surface of the second lens, wherein the second lens projects the light signal from the input waveguide onto the light detection chip, and the reverse light from the output waveguide is far away from the light detection chip;

and the sealing sleeve is sleeved on the peripheries of the input waveguide, the output waveguide, the first lens, the second lens and the optical detection chip and is used for providing sealing for the optical detection chip.

The optical unidirectional tap monitoring device of the embodiment is provided with the shading element for shading the reverse light from the output waveguide, so that the interference of the reverse light is reduced, and the isolation of the optical unidirectional tap monitoring device is improved; on the other hand, the optical one-way tap monitoring device according to the present embodiment is not limited to the outer diameter of the package structure of the optical detection chip by removing the package can of the optical detection chip. The external sealing sleeve is changed into the external sealing sleeve to meet the sealing requirement of the optical detection chip by removing the external packaging structure of the optical detection chip, so that the overall size of the optical unidirectional tap monitoring device is greatly reduced.

Drawings

FIG. 1 is a perspective view of an optical unidirectional tap monitoring device in accordance with a preferred embodiment of the present invention;

FIG. 2 is a perspective view from another angle of the optical unidirectional tap monitoring device shown in FIG. 1;

FIG. 3 is a schematic diagram of the optical path of the backward light of the optical single-direction tap monitoring device of the present invention;

FIG. 4 is a schematic diagram of the optical path of the signal light of the optical unidirectional tap monitoring device of the present invention;

fig. 5 is a cross-sectional view of the optical unidirectional tap monitoring device according to fig. 1.

The reference numerals are explained below: 10. an optical one-way tap monitoring device; 11. a waveguide; 111. an input waveguide; 112. an output waveguide; 12; an optical fiber head; 13. a first lens; 131. an incident surface; 132. an exit surface; 133. a tapping element; 14. a second lens; 141. an incident surface; 142. an exit surface; 140. a light shielding member; 15. a light detection chip; 150. a chip base; 152. a wire; 16. sealing the sleeve; 17. sealing glue; 18. a collar; 19. and a fixing member.

Detailed Description

While this invention is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present description is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to that as illustrated.

Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.

In the embodiments shown in the drawings, directional references (such as upper, lower, left, right, front and rear) are used to explain the structure and movement of the various elements of the invention not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.

The preferred embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, the present invention provides a preferred embodiment of an optical unidirectional tap monitoring device 10. The optical unidirectional Tap monitoring device 10 includes an input waveguide 111 and an output waveguide 112 arranged in parallel, a first lens 13, a Tap component 133, a second lens 14, a light shielding element 140, a light detecting chip 15, and a sealing sleeve 16 for sealing the above devices.

The optical unidirectional tap monitoring device further comprises an optical fiber head 12, wherein the optical fiber head 12 is used for fixing the input waveguide 111 and the output waveguide 112 therein. Wherein the input waveguide 111, the output waveguide 112 and the optical fiber head 12 are disposed together at one end of the optical unidirectional tap monitoring device 10.

The input waveguide 111 is used for inputting an optical signal, and the output waveguide 112 is used for outputting the optical signal. The input waveguide 111 and the output waveguide 112 are spaced apart and arranged in parallel. It is understood that the input waveguide 111 and the output waveguide 112 are preferably optical fibers, and may be other optical transmission media besides optical fibers. The fiber head 12 is disposed opposite to the first lens 13.

The first lens 13 is provided on one side of the input waveguide 111 and the output waveguide 112. The optical signal emitted from the input waveguide 111 is collimated by the first lens 13 to form collimated light. The end surface of the first lens 13 near one end of the input waveguide 111 and the output waveguide 112 is an incident surface 131 of the first lens 13, and the end surface at the other end is an exit surface 132 of the first lens 13.

The incident surface 131 of the first lens 13 is preferably an inclined surface. So that the optical signal can be prevented from being reflected at the incident surface 131 of the first lens 13. The incident surface 131 of the first lens 13 is fitted in parallel with the end surface of the optical fiber head 12 so that the optical signal emitted from the input waveguide 111 smoothly enters the first lens 13.

Referring to fig. 4 and 5, a tap element 133 is disposed between the first lens 13 and the second lens 14, and in the preferred embodiment, a tap element 133 is disposed at the exit surface 132 of the first lens 13, the tap element 133 is preferably a part of a transmissive film, most of the collimated light collimated by the first lens 13 is reflected by the tap element 133, and the part of the reflected light is converged by the first lens 13 to the output waveguide 112 and is output through the output waveguide 112. Another portion of the collimated light penetrates the tap element 133 and enters the second lens 14. The transmittance of the tap element 133 is related to the splitting ratio of the optical unidirectional tap monitoring device of the present embodiment.

It will be appreciated that the tap element 133 may also be embodied in other forms, such as a filter element or the like. In some embodiments, not shown, the tap element may also be a part of a transmissive film layer arranged on the second lens 14 or a separate device arranged between the first lens 13 and the second lens 14. The tap element 133 is capable of transmitting a small portion of the optical signal from the input waveguide 111 and reflecting a large portion of the optical signal to the output waveguide 112.

The second lens 14 is disposed on a side of the first lens 13 facing away from the input waveguide 111 and the output waveguide 112. One end surface of the second lens 14 facing the emission surface 132 of the first lens 13 is an incident surface 141, and the other end surface is an emission surface 142 of the second lens 14. The collimated light transmitted through the first lens 13 reaches the second lens 14, enters from the entrance surface 141 of the second lens 14, is refracted by the second lens 14, and then exits from the exit surface 142 of the second lens 14.

Referring to fig. 4 and 5, the photo detecting chip 15 is disposed on a side of the second lens 14 away from the first lens 13, and the photo detecting chip 15 is preferably located at a focal point of the second lens 14. The optical detection chip 15 is fixedly disposed on a chip base 150, and the chip base 150 is used for carrying the optical detection chip 15 and outputting the converted electrical signal to the outside. Wherein the photo detection chip 15 of the present invention does not have an outer packaging Can (Can) as a usual photo detection element, the photo detection chip 15 is bare facing the exit surface 142 of the second lens 14. The optical signal condensed by the second lens 14 is projected onto a receiving surface of the optical detection chip 15, and the optical detection chip 15 receives a part of the optical signal transmitted from the input waveguide 111 and converts it into an electrical signal, so that the output power of the optical signal input to the waveguide 111 can be monitored.

Referring to fig. 3, in the present embodiment, a light shielding element 140 is partially covered on the exit surface 142 of the second lens 14. Since the signal light is often reflected and incident multiple times during transmission in the optical transmission system, and a parasitic light with reverse transmission is generated, the output waveguide 112 also outputs a reverse light. The backward light enters the first lens 13 through the output waveguide 112, and a part thereof passes through the tap element 133 into the second lens 14. Since the light shielding member 140 is disposed on the optical path through which the backward light passes on the exit surface 142 of the second lens 14, the light shielding member 140 can shield the backward light from the output waveguide 112, weakening the intensity of the backward light. And the second lens 14 can also refract the backward light away from the optical detection chip 15, thereby being beneficial to improving the isolation of the optical one-way tap monitoring device 10.

Specifically, the first lens 13 and the second lens 14 are substantially cylindrical lenses, and the light shielding element 140 substantially covers a half area (semicircular shape) of the exit surface 142 of the second lens 14. Referring to fig. 3 and 4, the light shielding element 140 is preferably disposed only on the optical path of the backward light, but not on the optical path of the signal light. Thereby avoiding the light blocking element 140 from blocking the partially transmitted optical signal from the input waveguide 111. Therefore, the light shielding element 140 does not affect the monitoring of the optical signal from the input waveguide 111 by the optical detection chip 15 while shielding the backward light from the output waveguide 112.

It is understood that the light blocking element 140 may be formed by a coating of light absorbing material or a coating of light reflecting material, and may be a black glue layer. The operation of smearing the black glue layer is convenient, and the black glue layer hardly increases the volume of the optical one-way tap monitoring device 10, so that the overall size of the optical one-way tap monitoring device 10 is reduced, and the isolation of the optical one-way tap monitoring device 10 to reverse light is improved.

Referring to fig. 5, the sealing sleeve 16 is sleeved on the peripheries of the input waveguide 111, the output waveguide 112, the first lens 13, the second lens 14 and the optical detection chip 15, and is used for sealing the optical detection chip 15. It will be appreciated that the sealing sleeve 16 is preferably a cylindrical glass or metal tube of uniform bore size. The input waveguide 111 and the output waveguide 112 are hermetically connected with the sealing sleeve 16 through the optical fiber head 12. The fiber head 12 is hermetically connected with the sealing sleeve 16 through a sealant 17. It is noted that although the present embodiment shows the sealing sleeve 16 as a single piece, the sealing sleeve 16 in other embodiments may be made up of multiple sealing sleeves.

The optical detection chip 15 is fixed on the chip base 150, and the chip base 150 is hermetically connected with the sealing sleeve 16 through the sealant 17, so that the optical detection chip 15 is integrally sealed, and dust is prevented from contaminating the optical detection chip 15. The die pad 150 extends outwardly with a plurality of wires 152 for transmitting electrical signals.

A collar 18 is provided on the outside of the first lens 13 where it abuts the fibre optic head 12. The collar 18 secures the first lens 13, the fiber tip 12, to the sealing sleeve 16. The collar 18 is sleeved at the joint of the first lens 13 and the optical fiber head 12, so as to ensure that the first lens 13 and the optical fiber head 12 can be stably accommodated in the sealing sleeve 16.

A fixing member 19 is disposed between the outer sidewall of the second lens 14 and the inner sidewall of the sealing sleeve 16. The fixing member 19 can ensure that the second lens 14 and the sealing sleeve 16 maintain a relatively stable position, and the second lens 14 is prevented from shaking in the sealing sleeve 16. It will be appreciated that the securing member 19 may be a rubber pad, collar, or the like.

The optical unidirectional tap monitoring device 10 of the present embodiment removes the external package can of the optical detection chip 15, and provides a layer of substantially semicircular light shielding member 140 on the end surface of the second lens 14 facing the optical detection chip 15. The outer diameter of the package structure of the conventional optical detection chip 15 is greater than 2mm, and the outer diameter of the optical detection chip 15 is less than 0.4 mm. Therefore, the optical one-way tap monitoring device 10 of the present embodiment is not limited to the outer diameter of the outer package can of the optical detection chip 15, compared to the conventional optical one-way tap monitoring device. The invention adopts the external sealing sleeve 16 instead of removing the external packaging tank of the optical detection chip 15 to meet the sealing requirement of the optical detection chip 15, thereby greatly reducing the overall size of the optical one-way tap monitoring device 10. Specifically, in the optical unidirectional tap monitoring device 10, the outer diameters of the first lens 13 and the second lens 14 are both about 1.0mm, and therefore, the optical fiber head 12 may also have an outer diameter of 1.0mm, and therefore, the outer diameter of the optical unidirectional tap monitoring device 10 may be reduced to about 2mm from the 3.5mm size of the conventional optical unidirectional tap monitoring device.

Furthermore, the first lens 13 and the second lens 14 are both self-focusing lenses (lens lenses) and are closely arranged, so that the total length of the first lens 13 and the second lens 14 can be reduced as much as possible, and the total length of the first lens 13 and the second lens 14 is smaller than that of a spherical lens in a conventional structure. Therefore, the size of the optical unidirectional tap monitor device 10 is also greatly reduced along the optical axis of the optical signal, and finally, a subminiature optical unidirectional tap monitor device (UTMS) is realized.

In the optical one-way tap monitoring device 10, since the first lens 13, the second lens 14 and the chip base 150 have substantially the same outer diameter, the first lens 13, the second lens 14 and the optical detection chip 15 can be sealed and packaged together only by one sealing sleeve 16, thereby avoiding the use of a plurality of glass tubes with different sizes for respective packaging and connection. Therefore, the structural assembly of the optical unidirectional tap monitoring device 10 is also simple.

In addition, since the first lens 13 and the second lens 14 are located in the same sealing sleeve 16, and the relative positions of the first lens 13 and the second lens 14 are accurate, the position of the optical detection chip 15 only needs to be adjusted during debugging, and the operation is simple.

While the present invention has been described with reference to the above exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. An optical unidirectional tap monitoring device, comprising:

an input waveguide for inputting an optical signal;

2. The optical unidirectional tap monitoring device of claim 1 wherein the light blocking element is formed from a coating of light absorbing material or a coating of light reflecting material.

3. The optical unidirectional tap monitoring device of claim 2 wherein the light blocking element is disposed to cover half of the area of the exit face of the second lens.

4. The optical unidirectional tap monitoring device of claim 1, wherein the incident surface of the first lens and the exit surface of the second lens are inclined surfaces.

5. An optical unidirectional tap monitoring device as claimed in claim 1 wherein the tap element is a partially transmissive film layer disposed on the exit face of the first lens.

6. The optical unidirectional tap monitoring device of claim 1 further comprising an optical fiber head, wherein the input waveguide and the output waveguide are fixed to the optical fiber head, and the optical fiber head is opposite to the incident surface of the first lens and sealed in the sealed sleeve.

7. The optical unidirectional tap monitoring device of claim 6, wherein a collar is disposed outside the joint of the first lens and the optical fiber head, and the collar fixes the first lens and the optical fiber head to the sealing sleeve.

8. An optical unidirectional tap monitoring device as claimed in any one of claims 1 to 7 wherein said optical detection chip is mounted on a chip mount and has no external packaging can.

9. The optical unidirectional tap monitoring device of claim 8, wherein the chip base and the sealing sleeve are hermetically connected by a sealant.

10. An optical unidirectional tap monitoring device, comprising:

an input waveguide for inputting an optical signal;