Wavelength division multiplexer

Abstract

The utility model provides a wavelength division multiplexer. The wavelength division multiplexer is sequentially provided with a collimating lens, a first dichroscope, a first optical filter, a first focusing lens and a first photoelectric detector along an optical path transmission direction, the collimating lens is used for collimating input discrete light beams into parallel light beams, the first dichroscope is used for reflecting the parallel light beams, the first optical filter is used for filtering the reflected light beams, the first focusing lens is used for focusing the dispersed light beams, the first photoelectric detector is used for receiving the focused light beams, and the second photoelectric detector is used for receiving the focused light beams. And the optical signal is converted into an electric signal. The collimating lens is arranged at the front end of the first dichroscope, discrete light beams transmitted by the optical fiber are effectively collimated into parallel light beams, after the first dichroscope receives the parallel light beams, needed long-wave light beams are reflected, short-wave light beams are transmitted, then light beams corresponding to unneeded wave bands are filtered through the first optical filter, and the light beams are filtered through the second optical filter. Fluorescence loss can be reduced, and fluorescence collection efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of optical communication equipment, and in particular to a wavelength division multiplexer. Background Art

[0002] Wavelength Division Multiplexer (WDM) is a commonly used key component in optical communication systems. It can transmit optical signals of different wavelengths into optical fibers. The purpose is to increase the amount of communication data carried by a single optical fiber and save optical fiber resources. It is often used at the data sending and receiving ends.

[0003] When currently used, the existing wavelength division multiplexer is limited by the inconsistent incident angles of the light beam transmission, resulting in low fluorescence collection efficiency.

[0004] Therefore, how to improve the efficiency of fluorescence collection becomes a problem that needs to be solved.

[0005] The above information disclosed in the background section is only for enhancing understanding of the background of the present application and therefore it may contain information that does not form the prior art known to a person of ordinary skill in the art. Utility Model Content

[0006] The present application provides a wavelength division multiplexer to solve the problems existing in the prior art.

[0007] The present application provides a wavelength division multiplexer, which is provided with: a collimating lens, a first dichroic mirror, a first filter, a first focusing lens and a first photodetector in sequence along the transmission direction of the optical path;

[0008] The collimating lens is used to collimate the input discrete light beam into a parallel light beam, the first dichroic mirror is used to reflect the parallel light beam, the first filter is used to filter the reflected light beam, the first focusing lens is used to focus the scattered light beam, and the first photodetector is used to receive the focused light beam and convert the optical signal into an electrical signal.

[0009] In some embodiments, at least one set of optical components is further provided on the other side of the first dichroic mirror;

[0010] The optical component comprises: a second dichroic mirror, a second filter, a second focusing lens and a second photodetector which are sequentially arranged along the transmission direction of the light path.

[0011] In some embodiments, the first dichroic mirror is tilted at 45°.

[0012] In some embodiments, the method further includes: a base, on which the collimating lens, the first dichroic mirror, the first filter, the first focusing lens and the first photodetector are all arranged.

[0013] In some embodiments, a fiber optic base for connecting an optical fiber is provided on one side of the collimating lens.

[0014] In some embodiments, the first focusing lens is an aspherical lens.

[0015] The wavelength division multiplexer provided by the present application is provided with: a collimating lens, a first dichroic mirror, a first filter, a first focusing lens and a first photodetector in sequence along the transmission direction of the optical path; the collimating lens is used to collimate the input discrete light beam into a parallel light beam, the first dichroic mirror is used to reflect the parallel light beam, the first filter is used to filter the reflected light beam, the first focusing lens is used to focus the dispersed light beam, the first photodetector is used to receive the focused light beam, and convert the optical signal into an electrical signal. The present application effectively collimates the discrete light beams transmitted by the optical fiber into parallel light beams by arranging a collimating lens at the front end of the first dichroic mirror. After receiving the parallel light beam, the first dichroic mirror reflects the required long-wave light beam, while the short-wave light beam is transmitted, and then the first filter is used to filter the light beams corresponding to the unnecessary wavelength bands. The wavelength division multiplexer structure has a short transmission stroke, which can reduce fluorescence loss and improve fluorescence collection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] Figure 1 This is a schematic diagram of the structure of the wavelength division multiplexer provided in this application.

[0018] Description of Figure Numbers:

[0019] 1. Collimating lens; 2. First dichroic mirror; 3. First filter; 4. First focusing lens; 5. First photodetector; 6. Second dichroic mirror; 7. Second filter; 8. Second focusing lens; 9. Second photodetector; 10. Base; 11. Fiber optic base.

[0020] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "an" and "the" used in the embodiments of the present application are also intended to include plural forms, unless the context clearly indicates other meanings.

[0023] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "first", "second", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0026] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0027] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0028] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0029] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0030] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0031] Figure 1 The schematic diagram of the structure of the wavelength division multiplexer provided in this application is as follows: Figure 1 As shown, the wavelength division multiplexer provided by the present application is provided with: a collimating lens 1, a first dichroic mirror 2, a first filter 3, a first focusing lens 4 and a first photodetector 5 in sequence along the light path transmission direction;

[0032] The collimating lens 1 is used to collimate the input discrete light beam into a parallel light beam, the first dichroic mirror 2 is used to reflect the parallel light beam, the first filter 3 is used to filter the light beam reflected by the first dichroic mirror 2, and filter the light beam of unnecessary bands, the first focusing lens 4 is used to focus the scattered light beam, and the first photodetector 5 is used to receive the focused light beam and convert the optical signal into an electrical signal.

[0033] The present application adopts a collimating lens 1 to process light beams with different incident angles. By setting the collimating lens 1 at the front end of the first dichroic mirror 2, the discrete light beams transmitted by the optical fiber are effectively collimated into parallel light beams. After the first dichroic mirror 2 receives the parallel light beams, the required long-wave light beams are reflected, while the short-wave light beams are transmitted. The first filter 3 is then used to filter the light beams corresponding to unnecessary wavelength bands, thereby improving the fluorescence collection efficiency.

[0034] refer to Figure 1 As shown, in some embodiments, at least one set of optical components is further provided on the other side of the first dichroic mirror 2;

[0035] The optical assembly comprises: a second dichroic mirror 6, a second filter 7, a second focusing lens 8 and a second photodetector 9 which are sequentially arranged along the transmission direction of the light path.

[0036] Specifically, in the embodiment of the present application, two or more groups of optical components may be further disposed on the other side of the first dichroic mirror 2 .

[0037] When two groups of optical components are arranged on the other side of the first dichroic mirror 2, one group of optical components close to the first dichroic mirror 2 receives and transmits the light beam transmitted from the first dichroic mirror 2, and the other group of optical components is used to receive and transmit the light beam transmitted from the previous dichroic mirror, and so on.

[0038] Therefore, the number of the optical components disposed on the other side of the first dichroic mirror 2 can be set according to actual needs to form a plurality of light beam processing channels to improve the photoelectric conversion efficiency.

[0039] It should be noted that, in the embodiment of the present application, the first filter 3 and the second filter 7 are both bandpass filters.

[0040] In some embodiments, the first dichroic mirror 2 is tilted at 45°.

[0041] refer to Figure 1 As shown, in some embodiments, it further includes: a base 10, and the collimating lens 1, the first dichroic mirror 2, the first filter 3, the first focusing lens 4 and the first photodetector 5 are all arranged on the base 10.

[0042] Specifically, in the embodiment of the present application, a mounting hole for fixing the dichroic mirror is provided on the base 10 .

[0043] refer to Figure 1 As shown, in some embodiments, a fiber optic base 11 for connecting an optical fiber is provided on one side of the collimating lens 1 .

[0044] Specifically, in the embodiment of the present application, the optical fiber base 11 is disposed on one side of the base 10 , and the first photodetector 5 and the second photodetector 9 are respectively disposed on two sides of the base 10 adjacent to the optical fiber base 11 .

[0045] To be more specific, in the embodiment of the present application, the first dichroic mirror 2 is detachably connected to the base 10 .

[0046] In some embodiments, the first focusing lens 4 is an aspherical lens.

[0047] Specifically, in the embodiment of the present application, the collimating lens 1 is an aspherical lens.

[0048] The wavelength division multiplexer of the present application reduces fluorescence loss and improves fluorescence collection efficiency by setting up multiple light beam processing channels.

[0049] Working principle:

[0050] The light beam propagated by the optical fiber is effectively collimated after passing through the collimating lens 1. The collimated parallel light beam reflects part of the incident parallel light beam through the first dichroic mirror 2 with an inclination angle of 45°. The reflected light beam is vertically turned to the first channel on the side. The light beam entering the channel is filtered by a bandpass filter and focused into a light spot by the first focusing lens 4 (i.e., an aspherical lens) for effective light detection. The optical signal is then converted into an electrical signal by the first photodetector 5.

[0051] It should also be noted that after the above-mentioned parallel light beam passes through the first dichroic mirror 2, part of the light beam is reflected and part of the light beam is transmitted. The light beam transmitted to the other side of the first dichroic mirror 2 is received and processed by the set optical components.

[0052] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the claims.

[0053] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A wavelength division multiplexer, characterized in that: Along the transmission direction of the light path, there are arranged in sequence: a collimating lens, a first dichroic mirror, a first filter, a first focusing lens and a first photodetector; The collimating lens is used to collimate the input discrete light beam into a parallel light beam, the first dichroic mirror is used to reflect the parallel light beam, the first filter is used to filter the reflected light beam, the first focusing lens is used to focus the scattered light beam, and the first photodetector is used to receive the focused light beam and convert the optical signal into an electrical signal.

2. The wavelength division multiplexer according to claim 1, characterized in that: At least one set of optical components is also provided on the other side of the first dichroic mirror; The optical component comprises: a second dichroic mirror, a second filter, a second focusing lens and a second photodetector which are sequentially arranged along the transmission direction of the light path.

3. The wavelength division multiplexer according to claim 1 or 2, characterized in that: The first dichroic mirror is tilted at 45°.

4. The wavelength division multiplexer according to claim 1, characterized in that: Also includes: A base is provided on which the collimating lens, the first dichroic mirror, the first filter, the first focusing lens and the first photodetector are all arranged.

5. The wavelength division multiplexer according to claim 1, characterized in that: An optical fiber base for connecting an optical fiber is provided on one side of the collimating lens.

6. The wavelength division multiplexer according to claim 1, characterized in that: The first focusing lens is an aspherical lens.

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