CN217034329U - Single-fiber three-way optical device and optical modem - Google Patents

Abstract

The application belongs to the technical field of optical communication and relates to a single-fiber three-dimensional optical device and an optical modem. A single-fiber three-way optical device includes: the device comprises an optical device shell, a filtering component, a light emitting piece and a convex lens; the optical device housing has an inner cavity and a first channel and a second channel in communication with the inner cavity; the first channel is an incident/emergent light channel, and the second channel is an incident light channel; the filtering component is accommodated in the inner cavity; the convex lens is arranged between the filter assembly and the light emitting piece; the light emitting piece is arranged on the second channel and comprises a flat window lens and a laser; laser emitted by the laser is emitted from the first channel after being transmitted by the flat window lens, the convex lens and the filter assembly. By utilizing the single-fiber three-way optical device provided by the embodiment of the application, through the combination of the convex lens and the flat window lens, transmission is carried out in a parallel light mode, and the optical path loss is reduced.

Description

Single-fiber three-way optical device and optical modem

Technical Field

The application relates to the technical field of optical communication, in particular to a single-fiber three-way optical device and an optical modem.

Background

With the rapid development of network services, especially the gradual development and popularization of large-traffic services such as IPTV, HDTV, bidirectional video, and online video, the bandwidth requirement of each user will increase by orders of magnitude. Fiber To The Home (FTTH) is considered as an ultimate solution for broadband access, and Fiber To The Home means that one optical Fiber is directly connected To a Home in a broad sense, which meets The requirement of comprehensive services such as data, voice, CATV and The like on high bandwidth, but The Fiber To The Home is popularized, and The key is To reduce access cost.

In order to further reduce the access cost, the adoption of a single-fiber three-way transmission technology to realize the transmission of the integrated service has gradually become a mainstream of the development of the fiber-to-the-home technology. The single-fiber three-way transmission technology means that optical signals in three directions can be transmitted and received simultaneously in one optical fiber. The single-fiber three-way optical device has only one port, and filtering is carried out through a filter in the single-fiber three-way optical device, so that the emission of two wavelength optical signals and the receiving of the other wavelength optical signal can be simultaneously completed.

The single-fiber three-way optical device comprises an optical receiving element and an optical emitting element. The light emitting element is packaged in a Transistor Outline (TO), which is a Transistor package method and aims TO form a lead wire for surface mounting. Referring TO fig. 1, a conventional transistor outline package 200 includes a probe 210, a laser 220, a TO cap 230, an aspherical lens 240, a pin 250, and a TO base 260. The TO cap 230 has an internal cavity, the pin 250 and the TO cap 230 are both disposed on the TO base 260, the laser 220 and the probe 210 are both disposed in the internal cavity of the TO cap 230, and the aspheric lens 240 is disposed on the TO cap 230. Thus, the laser beam is emitted by the laser 220 and is emitted from the aspherical lens 240.

The transistor outline package is applied to a single-fiber three-way optical device, which can receive and transmit light with wavelengths of 1310nm, 1490nm and 1550nm, but the traditional single-fiber three-way optical device adopts a lens type of the aspheric lens 220, so that laser light emitted from the laser 220 is converged into a point at the focus of the aspheric lens 240 after passing through the aspheric lens 240. After the collected light passes through the filter, the power attenuation of the light is relatively large, and the light is not easy to couple.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that attenuation ratio of light after passing through a filter is large, the application provides a single-fiber three-way component and an optical modem.

In a first aspect, the present application provides a three-way subassembly, comprising: the device comprises an optical device shell, a filtering component, a light emitting piece and a convex lens;

the optical device housing has an inner cavity and a first channel and a second channel communicated with the inner cavity; the first channel is an incoming/outgoing light channel, and the second channel is an incoming light channel;

the filtering component is accommodated in the inner cavity;

the convex lens is arranged between the filter assembly and the light emitting piece;

the light emitting piece is arranged on the second channel and comprises a flat window lens and a laser;

and laser emitted by the laser is emitted from the first channel after passing through the transmission of the flat window lens, the transmission of the convex lens and the transmission of the filter assembly.

Optionally, the filter assembly includes a first filter and a second filter, and the optical device housing further has a third channel and a fourth channel communicated with the inner cavity;

the light incident from the first channel is reflected by the first filter plate and then emitted from the third channel, and the light incident from the first channel is transmitted by the first filter plate and reflected by the second filter plate and then emitted from the fourth channel.

Optionally, the first direction is a direction of light incident from the first channel, the second direction is a direction of light incident from the second channel, the third direction is a direction of light emitted from the third channel, and the fourth direction is a direction of light emitted from the fourth channel;

the first direction is opposite to the second direction, and the third direction and the fourth direction are respectively perpendicular to the first direction;

first filter with first contained angle a has between the first direction, second filter with second contained angle b has between the first direction, first contained angle a with the value range of second contained angle b sum is greater than 89, and is less than 91.

Optionally, the first included angle a has a value range of 44 ° < a < 46 °.

Optionally, the second included angle b has a value range of 44 ° < a < 46 °.

Optionally, the first and second channels are aligned.

Optionally, the single-fiber three-way optical device further includes two light receiving elements, and the two light receiving elements are respectively disposed on the third channel and the fourth channel.

Optionally, the light receiving element is packaged in a transistor shape.

Optionally, the light emitter is packaged in a transistor outline.

In a second aspect, the present application provides an optical modem, which includes the above-mentioned triplexer.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:

the single fiber three-way subassembly that this application embodiment provided includes: the device comprises a light device shell, a filtering component, a light emitting piece and a convex lens. The light emitting piece is arranged on the second channel and comprises a flat window lens and a laser; laser emitted by the laser is emitted from the first channel after passing through the transmission of the flat window lens, the transmission of the convex lens and the transmission of the filter assembly. Thus, light emitted by the laser of the light emitting part enters from the second channel after passing through the flat window lens, and the light enters the filter assembly in a parallel light mode after being transmitted by the convex lens and is emitted from the first channel. Like this, through adopting convex lens to combine the mode of flat window lens for light transmits with the mode of collimated light, reduces the loss that light passes through filtering component, thereby improves coupling efficiency, changes in automated production more easily.

The optical modem provided by the embodiment of the application comprises the single-fiber three-way optical device. The single-fiber three-way optical device is applied to the optical modem, and the loss of light transmitting through the filtering component can be reduced, so that the coupling efficiency is improved, and the automatic production is easier.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

FIG. 1 is a schematic diagram of a transistor outline package;

fig. 2 is a schematic structural diagram of a single-fiber three-way optical device according to an embodiment of the present application;

fig. 3 is a front view of a single-fiber three-way optical device provided in an embodiment of the present application;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

fig. 5 is an optical path diagram of a single-fiber three-way optical device according to an embodiment of the present application.

Reference numerals:

100. a single-fiber three-way optical device; 110. a light device housing; 120. a filtering component; 121. a first filter; 122. a second filter; 133. a light emitting member; 140. a convex lens; 131. a first light receiving element; 132. and a second light receiving part.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.

Referring to fig. 2 to 5, an embodiment of the present application provides a single-fiber three-way optical device 100, including: a light device case 110, a filter assembly 120, a light emitting member 133, and a convex lens 140.

The optics housing 110 has an interior cavity and first and second channels in communication with the interior cavity; the first channel is an incident/emergent light channel, and the second channel is an incident light channel; the filter assembly 120 is received in the inner cavity; the convex lens 140 is disposed between the filter assembly 120 and the light emitting member 133; the light emitting member 133 is disposed on the second channel, the light emitting member 133 including a flat window lens and a laser; laser light emitted by the laser exits from the first channel after passing through the transmission of the flat window lens, the transmission of the convex lens 140 and the transmission of the filter assembly 120.

In this way, with the single-fiber three-way optical device 100 provided in the embodiment of the present application, light is emitted by the laser of the light emitting element 133, and then the light exits from the flat window lens of the light emitting element 133, and after being transmitted by the convex lens 140, is incident on the filter assembly 120, and exits from the first channel via the filter assembly 120. By adopting the convex lens 140 in combination with the flat window lens, light is transmitted in a parallel light manner, and the loss of light passing through the filter assembly 120 is reduced, so that the coupling efficiency is improved, and the automatic production is easier.

In a specific embodiment, the filter assembly 120 includes a first filter 121 and a second filter 122, and the optical device housing 110 further has a third channel and a fourth channel communicated with the inner cavity;

light incident from the first channel is emitted from the third channel after being reflected by the first filter 121, and light incident from the first channel is emitted from the fourth channel after being transmitted by the first filter 121 and reflected by the second filter 122.

The wavelengths of the light incident from the first channel are 1490nm and 1550nm, and the light with the wavelength of 1490nm is incident from the first channel, is transmitted by the first filter 121, is incident on the second filter 122, is emitted by the second filter 122, and is emitted from the fourth channel. Light having a wavelength of 1550nm enters the first channel, is reflected by the first filter 121, and exits the third channel. The wavelength of the light incident from the second channel is 1310nm, and the light with the wavelength of 1310nm enters from the second channel, and is emitted from the first channel after passing through the transmission of the convex lens 140 and the transmission of the filter assembly 120.

In this way, the light with three wavelengths can be split by the filter component 120, thereby avoiding crosstalk between optical paths and reducing loss of the optical paths. The transmission of light of a specific wavelength and the reflection of light of a specific wavelength are determined by the plated films on the first filter 121 and the second filter 122, respectively. When light with 1310nm, 1490nm and 1550nm passes through the filter assembly 120, the coating films on the first filter 121 and the second filter 122 are adjusted to allow light with a specific wavelength to pass or reflect light with a specific wavelength.

Referring to fig. 5, a first direction H is a direction of an arrow H in fig. 5, a second direction K is a direction of an arrow K, a third direction I is a direction of an arrow I, and a fourth direction J is a direction of an arrow J.

The first direction H is a direction of light incident from the first channel, the second direction K is a direction of light incident from the second channel, the third direction I is a direction of light emitted from the third channel, and the fourth direction J is a direction of light emitted from the fourth channel.

The first direction H is opposite to the second direction K, and the third direction I and the fourth direction J are respectively vertical to the first direction H; first included angle a is formed between first filter 121 and first direction H, second included angle b is formed between second filter 122 and first direction H, and the value range of the sum of first included angle a and second included angle b is larger than 89 degrees and smaller than 91 degrees.

By this arrangement, the light emerging from the third and fourth channels are both at substantially perpendicular angles to the light incident from the first channel, reducing the power loss for light having wavelengths of 1550nm and 1490 nm.

A first included angle a is formed between the first filter segment 121 and the first direction H, and the value range of the first included angle a is 44 degrees < a < 46 degrees. Thus, light having a wavelength of 1550nm enters in the first direction H, is reflected by the first filter 121, and exits in the third direction I. The first direction H is perpendicular to the third direction I, thereby reducing the power loss of light having a wavelength of 1550 nm. The term "perpendicular" as used herein refers to substantially perpendicular, not absolute perpendicular in a mathematical sense, i.e., a certain tolerance is allowed, so that the value of the first included angle a is allowed to have a tolerance within ± 0.5 °.

In a specific embodiment, the value of the first included angle a may be 45 °, of course, when an angle between the first filter segment 121 and the first direction H is actually adjusted, there may be a certain deviation, and the value of the first included angle a may be 45.5 ° or 44.5 °.

A second included angle b is formed between the second filter 122 and the first direction H, and the value range of the second included angle b is 44 degrees < b < 46 degrees. Thus, light having a wavelength of 1490nm is incident on first filter 121 in first direction H, is transmitted through first filter 121, is incident on second filter 122, and is reflected by second filter 122, so that light having a wavelength of 1490nm is emitted in fourth direction J. The first direction H is perpendicular to the fourth direction J, so that the power loss of light is reduced. The term "perpendicular" as used herein is substantially perpendicular and not absolute perpendicular in a mathematical sense, i.e., a certain tolerance is allowed, so that the value of the second included angle b is allowed to have a tolerance within ± 0.5 °.

In a specific embodiment, the value of the second included angle b may be 45 °, of course, when an angle between the second filter 122 and the first direction H is actually adjusted, there may be a certain deviation, and the value of the second included angle b may be 45.5 ° or 44.5 °.

The first and second channels are aligned. The light path from the first channel to the second channel is parallel and level, so that the transmission distance of the light path is shortened, the loss of optical power is reduced, and better transmission efficiency can be realized.

The single-fiber three-way optical device 100 further includes two light receiving elements respectively disposed on the third channel and the fourth channel. The two light receiving elements include a first light receiving element 131 and a second light receiving element 132, the first light receiving element 131 is disposed on the third channel, and the second light receiving element 132 is disposed on the fourth channel.

The light receiving part is packaged in a transistor shape. The light emitting member 133 is packaged in a transistor profile. By adopting Transistor Outline (TO) packaging, the single-fiber three-dimensional optical device 100 can be developed towards miniaturization, and the structure is more compact.

The embodiment of the present application further provides an optical modem, which includes a single-fiber three-way optical device 100. Applying the single fiber three-way optical device 100 to an optical modem, the single fiber three-way optical device 100 including a convex lens 140, the convex lens 140 being configured such that the second filter 122 is located between the convex lens 140 and the first filter 121; the convex lens 140 is used for coupling non-parallel incident light into parallel light. In the prior art, aspheric lenses are used to emit converging light. The condensed light emitted by the aspheric lens has higher possibility of being out of focus and has higher unreliable risk. Out-of-focus, i.e. after passing through the aspheric lens, all light will be focused on the focal point, and if the received light screen is not placed exactly at the focal point, a larger spot will be obtained, so that the image will be blurred. The single-fiber three-way optical device 100 provided by the embodiment of the application changes an aspheric lens in the prior art into a plane mirror, and simultaneously, a convex lens 140 is added in front of the plane mirror, so that parallel light is emitted after passing through the convex lens 140. Since the spot of the parallel light may be relatively large, coupling is easy, and loss after passing through the filter assembly 120 is small.

The optical modem, also called single-port optical transceiver, is called optical modem for short, and converts the optical ethernet signal of the optical fiber into an electronic signal that can be recognized by a computer. The optical modem is a three-piece optical fiber transmission device developed for special user environment. The optical fiber transmission equipment adopts a large-scale integrated chip, has the characteristics of simple circuit, low power consumption and high reliability, and also has complete alarm state indication and perfect network management functions.

The optical modem provided by the embodiment of the application can also transmit the broadcast television signal by using the light with the wavelength of 1550 nm. A highly integrated single-fiber three-way optical device 100 is adopted in an optical modem to integrate the receiving and transmitting of digital signals and analog signals in one module, thereby providing independent physical channels for the transmission of three different services, realizing the integration of three services of voice, data and video in a physical layer and having minimum requirements on the reconstruction of the existing telecommunication network, data network and broadcast network.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A single-fiber three-way optical device, comprising: the device comprises an optical device shell, a filtering component, a light emitting piece and a convex lens;

the optical device housing has an inner cavity and a first channel and a second channel in communication with the inner cavity; the first channel is an incident/emergent light channel, and the second channel is an incident light channel;

the filtering component is accommodated in the inner cavity;

the convex lens is arranged between the filtering component and the light emitting component;

the light emitting piece is arranged on the second channel and comprises a flat window lens and a laser;

laser emitted by the laser is emitted from the first channel after being transmitted by the flat window lens, the convex lens and the filter assembly.

2. The triplexer of claim 1 wherein the filter assembly includes a first filter and a second filter, the housing further having a third channel and a fourth channel in communication with the interior cavity;

light incident from the first channel is emitted from the third channel after being reflected by the first filter, and light incident from the first channel is emitted from the fourth channel after being transmitted by the first filter and reflected by the second filter.

3. The device of claim 2, wherein the first direction is a direction of light incident from the first channel, the second direction is a direction of light incident from the second channel, the third direction is a direction of light exiting from the third channel, and the fourth direction is a direction of light exiting from the fourth channel;

the first direction is opposite to the second direction, and the third direction and the fourth direction are respectively perpendicular to the first direction;

first filter with first contained angle a has between the first direction, the second filter with second contained angle b has between the first direction, first contained angle a with the value range of second contained angle b's sum is greater than 89, and is less than 91.

4. The device according to claim 3, wherein said first angle a is in the range of 44 ° < a < 46 °.

5. The triplex optical device according to claim 3, wherein said second included angle b is in a range of 44 ° < a < 46 °.

6. The device of any of claims 1-5, wherein the first channel and the second channel are aligned.

7. The device of claim 2, further comprising two light receiving elements disposed on said third and fourth channels, respectively.

8. The device of claim 7, wherein the light receiving element is encapsulated in a transistor profile.

9. The device of claim 7, wherein the light emitter is encapsulated in a transistor outline package.

10. An optical modem comprising the triplexer as claimed in any of claims 1-9.

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