CN212207744U - WDM demultiplexer based on thin film interference filter - Google Patents
WDM demultiplexer based on thin film interference filter Download PDFInfo
- Publication number
- CN212207744U CN212207744U CN202020521063.2U CN202020521063U CN212207744U CN 212207744 U CN212207744 U CN 212207744U CN 202020521063 U CN202020521063 U CN 202020521063U CN 212207744 U CN212207744 U CN 212207744U
- Authority
- CN
- China
- Prior art keywords
- prism
- demultiplexer
- stage
- film interference
- interference filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a WDM demultiplexer based on film interference filter, including preceding stage demultiplexer and back level demultiplexer, preceding stage demultiplexer sets up the place ahead at the light beam entrance port of back level demultiplexer, this preceding stage demultiplexer divides into about incident beam two bundles respectively and carries the light wave of first half each wavelength and back half each wavelength, interval about there is when two bundles of parallel outgoing light waves from top to bottom, back level demultiplexer carries out the re-wave to the upper and lower two bundles of light waves of incident, the ductility of three-dimensional space each direction has been fully utilized, can make photolysis multiplexer (DeMUX) do compacter, the light path of certain channel has also been shortened relatively simultaneously, make the device be convenient for the coupling, be favorable to making the photolysis multiplexer (DeMUX) that has more wavelength channels.
Description
Technical Field
The utility model relates to a physics optics and optical fiber communication passive device technical field, in particular to WDM demultiplexer based on film interference filter.
Background
The Wavelength Division Multiplexing (WDM) technology has been widely used in optical fiber transmission systems and optical network systems, and uses an optical fiber to transmit a plurality of optical carriers with different wavelengths, making full use of the optical fiber bandwidth, so that the information amount transmitted by the optical fiber is multiplied, thereby greatly reducing the cost of optical fiber transmission; as far as optical wavelength demultiplexers are concerned, the most mature at present are demultiplexers based on thin film interference filters (TFF). Fig. 1 is a typical structure and an optical path schematic diagram of an incident light as a collimated light of a conventional four-wave WDM demultiplexer (DeMUX) based on a thin film interference filter, and fig. 2 is a typical structure and an optical path schematic diagram of an incident light as a collimated light of a conventional eight-wave WDM demultiplexer (DeMUX) based on a thin film interference filter, the entire structure of the optical demultiplexer is composed of a parallelogram-shaped quartz prism (prism) with an acute angle of 82 °, an incident port of a multi-wave (λ 1, λ 2, λ 3, λ 4, etc.) beam of a front plane thereof is an Antireflection (AR) coated region, the rest thereof is a High Reflection (HR) coated region, and a rear plane thereof is attached with a plurality of narrow-band thin film interference filters (TFF) at respective optical wave output ports thereof. From the schematic diagram, it can be seen that the optical path of the existing thin film interference filter WDM demultiplexer (DeMUX) is spread on a plane, so that the width of the device is much larger than the height of the device in terms of the linearity of the device. A typical four wave device has a width of 3.5mm and a length of 3.92mm, while the height of the device is 1mm, which is small compared to the width and length of the device. If the device is limited in width when in use, for example, the device must be smaller than 2mm, the existing four-wave thin-film interference filter WDM demultiplexer (DeMUX) cannot be used. In addition, the optical path traveled by the fourth wave λ 4 is far larger than the optical path traveled by the first wave λ 1, and the fourth wave λ 4 must accompany the first three waves of light to complete all the optical paths before reaching its output port. The third wave and the fourth wave are much more difficult to couple than the first wave and the second wave. If the existing thin film interference filter WDM demultiplexer (DeMUX) is made into eight waves, the width of the demultiplexer reaches 7mm, the optical path of the seventh and eighth waves is longer, and the general collimator has a difficult collimation distance.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the purpose: the linear degree that transversely accounts for overcoming the device compares vertically much more, and the optical path overlength that the light wave that can not make full use of 3D space and final outgoing walked is difficult to make the collimater reach defects such as collimation distance so long, the utility model provides a novel WDM demultiplexer based on film interference filter.
The technical scheme is as follows: a WDM demultiplexer based on film interference filter includes a front-stage demultiplexer and a rear-stage demultiplexer arranged in front of a light beam entrance port of the rear-stage demultiplexer, an upper light beam includes light beams of the rear half of the incident light beam with each wavelength, a lower light beam includes light beams of the front half of the incident light beam with each wavelength, an upper and a lower space exists when the upper and the lower parallel light beams exit, and the rear-stage demultiplexer performs re-splitting on the incident upper and the lower parallel light beams.
Furthermore, the pre-stage demultiplexer comprises a pre-stage prism and a band-pass thin-film interference filter arranged at an output port at the lower part of a rear end plane of the pre-stage prism, wherein the band-pass thin-film interference filter totally transmits the light beams with the first half wavelengths in the input light beams and totally reflects the light beams with the second half wavelengths.
Furthermore, the post-stage demultiplexer comprises a post-stage prism and narrow-band thin-film interference filters which are arranged on the rear end plane of the post-stage prism and correspond to the light beam output ports of all paths.
Furthermore, the front-stage prism and the rear-stage prism are both in a parallelogram structure.
Furthermore, the up-down distance required by the outgoing of the upper and lower two parallel beams is obtained by adjusting the acute angle and the length of the preceding stage prism.
Furthermore, the rear-stage prism is composed of two sub-prisms which have the same structure and are stacked up and down.
Furthermore, a plated antireflection film area is arranged at the light beam incident port of the front end plane of the front stage prism and the rear stage prism, and the rest parts are plated high reflection film areas. Furthermore, the bottom surfaces of the front-stage prism and the rear-stage prism are positioned on the same horizontal plane, and the side surface of the rear-stage prism is parallel to the side surface of the front-stage prism.
Furthermore, an antireflection coating area is coated at the upper output port of the rear end plane of the front stage prism of the front stage demultiplexer, and a high reflection coating area is coated between the upper output port and the lower output port of the front stage prism.
Has the advantages that: compared with the prior art, the utility model has the advantages of it is following:
1. the optical path that the longest light wave of the optical path in the light beam of the WDM demultiplexer (DeMUX) of the utility model walks is shorter than the optical path that the corresponding light wave in the existing demultiplexer walks, and the linearity of the width direction is also smaller than that of the existing demultiplexer;
2. the WDM demultiplexer (DeMUX) of the utility model can highlight the characteristics of short optical path and compact structure when the WDM demultiplexer (DeMUX) is used for the light wave which is more than four waves (such as six waves, eight waves or more waves) to be demultiplexed;
3. the utility model discloses a preceding stage prism and all film interference filters that post are as a preceding stage demultiplexer, and it divides the light wave of various wavelength of the collimated light beam of incidenting into two bundles of upper and lower parallel light beam that respectively carry the half of the preceding and half of the back wavelength, and the upper and lower spatial distance of two bundles of upper and lower parallel light beam can be realized through the acute angle and the prism length of proper design preceding stage prism, compares the optical path of its longest light path of present film interference filter demultiplexer and will get short, so makes the coupling of device light beam become convenient;
4. the pre-demultiplexing of the pre-stage prism and the lamination of the post-stage prism can be utilized to make the demultiplexer of the utility model more compact than the existing demultiplexer of the thin film interference filter in the width of the device;
5. the extensibility of each direction of the three-dimensional space is fully utilized, so that the optical demultiplexer (DeMUX) can be made more compact, and meanwhile, the optical path of a long optical path channel is relatively shortened, so that the device is convenient to couple, and the optical demultiplexer (DeMUX) with a plurality of wavelength channels can be manufactured.
Drawings
FIG. 1 is a schematic diagram of a typical optical path and structure of a prior art narrow-band thin-film interference filter-based four-wave WDM demultiplexer (DeMUX);
FIG. 2 is a schematic diagram of a typical optical path and structure of a prior art narrow-band thin-film interference filter-based eight-wave WDM demultiplexer (DeMUX);
FIG. 3 is a schematic diagram of the structure and geometrical configuration of the four-wave WDM demultiplexer based on thin-film interference filter according to the present invention;
fig. 4 is a detailed engineering drawing of a third prism of the present invention;
FIG. 5 is a schematic diagram of the optical path of the four-wave WDM demultiplexer based on the thin-film interference filter according to the present invention;
FIG. 6 is a top view of the four-wave WDM demultiplexer based on thin-film interference filters of the present invention;
fig. 7 is a schematic structural diagram of the eight-wave WDM demultiplexer based on the thin film interference filter of the present invention.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.
Example 1:
fig. 3 is the structure and geometrical configuration schematic diagram of the four-wave WDM demultiplexer based on the thin-film interference filter of the present invention, which is composed of three prisms, i.e. a first prism 1, a second prism 2 and a third prism 3, the widths of the first prism 1 and the second prism 2 are half of those of the prism used in the existing four-wave WDM demultiplexer of fig. 1, and the length and height are consistent with those of fig. 1. The light beam incident ports of the front end planes of the first prism 1, the second prism 2 and the third prism 3 are provided with an antireflection coating area AR, the rest parts are high reflection coating areas HR, the upper output port of the rear end plane of the third prism 3 is provided with an antireflection coating area, the part between the upper output port and the lower output port is a high reflection coating area, and two narrow-band thin-film interference filters TFF are respectively attached to the output ports of the rear end planes of the first prism 1 and the second prism 2. The first prism 1 and the second prism 2 are stacked up and down, specifically, the first prism 1 is arranged below the second prism 2, a narrow-band thin-film interference filter TFF for splitting the first wave lambda 1 and the second wave lambda 2 is attached to an output port of the first prism 1, a narrow-band thin-film interference filter TFF for splitting the third wave lambda 3 and the fourth wave lambda 4 is attached to an output port of the second prism 2, the third prism 3 is arranged in front of a light beam entrance port of the first prism 1 and the second prism 2, bottom surfaces of the third prism and the first prism are arranged on the same horizontal plane, a side surface of the third prism 3 is parallel to side surfaces of the first prism 1 and the second prism 2, and the third prism 3 is close to the first prism 1 and the second prism 2 as much as possible under the permission of a space of a geometric configuration. The third prism 3 is a parallelogram-shaped prism having acute angles, and if the paper plane is taken as an X-Y plane, the horizontal direction to the right on the paper plane is taken as an X direction, and the vertical direction to the paper plane is taken as a Z direction, the third prism 3 is oriented by 90 ° counterclockwise around the X axis similarly to the prism in fig. 1.
A band-pass thin film interference filter is attached to an output port at the lower part of the rear end plane of the third prism 3, the TFF can fully transmit the first half of the light waves with each wavelength in the input light beam and fully reflect the second half of the light waves with each wavelength, and the parallelogram acute angle value and the length L value of the third prism 3 are properly set, so that the light path of the light beam of the second half of the light waves with each wavelength after being fully reflected is improved by 1mm in the Z direction; thus, the input light beam is split into parallel light beams with the vertical spacing of 1mm in the Z direction after passing through the third prism 3, each parallel light beam carries half of the wavelength of the light wave with all the wavelengths carried by the input light beam, the two parallel light beams are respectively emitted into the first prism 1 and the second prism 2 which are overlapped together, and the light beams with different required wavelengths are separated in space by corresponding narrow-band thin-film interference filters TFF attached to the output ports of the first prism 1 and the second prism 2 through refraction and reflection.
As one of the design solutions of the prism in example 1, fig. 4 shows a detailed engineering drawing of the third prism 3, the third prism 3 having a width of 1mm and a height of 2mm, the third prism 3 having an acute angle of parallel four sides of 82 ° and made of quartz, and the prism having a length L of 2.64 mm.
Specifically, when four waves (λ 1, λ 2, λ 3, λ 4) enter the collimated light beam horizontally and parallel to the side surfaces of the three prisms, the collimated light beam enters the third prism 3, is refracted, and then meets a band-pass thin-film interference filter at the output port below the third prism. The bandpass thin-film interference filter TFF is designed to allow the first wave λ 1 and the second wave λ 2 to be fully transmitted, while the third wave λ 3 and the fourth wave λ 4 are fully reflected, i.e., the third prism 3 is used to divide the light beams λ 1, λ 2, λ 3, λ 4 into two parallel light beams λ 1, λ 2 and λ 3, λ 4. The light beam emitted from the output port below the third prism 3 contains light waves λ 1 and λ 2, and the height of the incident collimated light beam of four waves (λ 1, λ 2, λ 3, λ 4) in the Z-axis direction is appropriately adjusted so that the height of the light beam containing λ 1 and λ 2 from the bottom surface of the first prism in the Z-axis direction is exactly half the thickness of the first prism, and after entering the first prism, the light beam is split horizontally in the first prism and two independent parallel light beams λ 1 and λ 2 are emitted. After being internally reflected for several times in the third prism 3, the light beam containing the lambda 3 and the lambda 4 rises by 1mm in the Z-axis direction when being emitted from an output port at the upper part of the third prism 3, just leads the height of the light beam from the bottom surface of the second prism in the Z-axis direction to be half of the thickness of the second prism, and after being horizontally emitted into the second prism 2, the light beam is spatially split in the horizontal direction through refraction and reflection in the second prism 2 and is emitted into two independent parallel light beams lambda 3 and lambda 4.
By properly adjusting the acute angle and the length L of the parallelogram of the third prism 3, the light beams containing lambda 3 and lambda 4 can always be higher by 1mm in the Z-axis direction when being emitted from the third prism 3 than the light beams containing lambda 1 and lambda 2 emitted from the third prism 3, so that the light beams can respectively enter the first prism 1 and the second prism 2 according to the designed light path to be split according to the wavelength again.
The optical paths λ 3 and λ 4 in the four-wave WDM demultiplexer (DeMUX) based on the thin-film interference filter of the present embodiment are shorter than the optical paths λ 3 and λ 4 in the four-wave WDM demultiplexer (DeMUX) of the conventional thin-film interference filter in fig. 1. And the linearity in the Y direction is only half that of the four-wave WDM demultiplexer (DeMUX) of the thin film interference filter of fig. 1.
Example 2:
the embodiment combines the first prism 1 and the second prism 2 into a prism with a thickness of 2mm, and the corresponding required narrow-band thin-film interference filter TFF is suitably attached to the output port, and the prism with a thickness of 2mm can perform the same function as the first prism 1 and the second prism 2, but the assembly is simpler.
If first prism 1 and second prism 2 are two ripples, then the utility model discloses a demultiplexer is the demultiplexer of a four ripples, if first prism 1 and second prism 2 are four ripples, then the utility model discloses a demultiplexer can be the demultiplexer of an eight ripples. As can be seen from fig. 7, the four-wave multiplexer WDM demultiplexer (DeMUX) based on thin-film interference filter of the present invention can be conveniently extended to eight waves, the demultiplexer (DeMUX) of the present invention is much more compact than the existing demultiplexer (DeMUX), and the optical path lengths of λ 5, λ 6, λ 7 and λ 8 are also short. In a similar way, the demultiplexer of the present invention can be made into more wave demultiplexers.
The utility model discloses a third prism 3 and band-pass film interference filter that all posts are as a preceding stage demultiplexer, and it is divided into the light wave of two bundles of light respectively and carries the light wave of half preceding and half back wavelength about with the light wave of the various wavelengths of incident beam, and the spatial distance accessible of two bundles of light from top to bottom suitably designs the acute angle and the prism of prism three long and realizes. The use of a pre-demultiplexing third prism 3, the stack of first prism 1 and second prism 2, enables the demultiplexer of the present invention to be more compact in device width than existing thin film interference filter demultiplexers. The pre-demultiplexing of the third prism 3 is utilized to divide the light wave with various wavelengths of the incident light beam into an upper light wave and a lower light wave which respectively carry the light wave with the first half and the light wave with the second half of the wavelength, so that when the light wave with the second half of the wavelength completes the final spatial separation of the light waves with various wavelengths, compared with the prior thin film interference filter demultiplexer, the optical path taken by the corresponding light wave is shorter, and the coupling of the light beams of the device is convenient.
Claims (9)
1. A WDM demultiplexer based on thin film interference filters characterized by: the optical fiber multi-wavelength demultiplexing device comprises a rear-stage demultiplexer and a front-stage demultiplexer arranged in front of a light beam incident port of the rear-stage demultiplexer, wherein the front-stage demultiplexer divides an incident light beam into an upper beam and a lower beam of parallel light beams, the upper beam of light beams comprises the light beams with the second half of the incident light beam and each wavelength, the lower beam of light beams comprises the light beams with the first half of the incident light beam and each wavelength, an upper space and a lower space exist when the upper beam of parallel light beams and the lower beam of parallel light beams are emitted, and the rear-stage demultiplexer performs re-wave.
2. A WDM demultiplexer based on a thin film interference filter as claimed in claim 1, wherein: the pre-stage demultiplexer comprises a pre-stage prism and a band-pass thin-film interference filter arranged at an output port at the lower part of a rear end plane of the pre-stage prism, wherein the band-pass thin-film interference filter totally penetrates through the first half of light beams with various wavelengths in the input light beams and the second half of light beams with various wavelengths after total reflection.
3. A WDM demultiplexer based on a thin film interference filter as claimed in claim 2, wherein: the post-stage demultiplexer comprises a post-stage prism and narrow-band thin-film interference filters which are arranged on the rear end plane of the post-stage prism and correspond to the light beam output ports of all paths.
4. A WDM demultiplexer based on a thin film interference filter as claimed in claim 3, wherein: the front-stage prism and the rear-stage prism are both in parallelogram structures.
5. A WDM demultiplexer based on a thin film interference filter as claimed in claim 2, wherein: and the vertical distance required by the outgoing of the upper and lower two parallel beams is obtained by adjusting the acute angle and the length of the preceding stage prism.
6. A WDM demultiplexer based on thin film interference filters as claimed in claim 4, wherein: the rear-stage prism can be composed of two sub-prisms which have the same structure and are stacked up and down.
7. A WDM demultiplexer based on a thin film interference filter as claimed in claim 3, wherein: and the light beam incident ports of the front end planes of the front stage prism and the rear stage prism are provided with antireflection film plating areas, and the rest parts are high reflection film plating areas.
8. A WDM demultiplexer based on a thin film interference filter as claimed in claim 3, wherein: the bottom surfaces of the front-stage prism and the rear-stage prism are positioned on the same horizontal plane, and the side surface of the rear-stage prism is parallel to the side surface of the front-stage prism.
9. A WDM demultiplexer based on a thin film interference filter as claimed in claim 3, wherein: an antireflection coating plating region is arranged at an upper output port of a front-stage prism rear-end plane of the front-stage demultiplexer, and a high reflection coating plating region is arranged between the upper output port and a lower output port of the front-stage demultiplexer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020521063.2U CN212207744U (en) | 2020-04-10 | 2020-04-10 | WDM demultiplexer based on thin film interference filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020521063.2U CN212207744U (en) | 2020-04-10 | 2020-04-10 | WDM demultiplexer based on thin film interference filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212207744U true CN212207744U (en) | 2020-12-22 |
Family
ID=73829068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020521063.2U Active CN212207744U (en) | 2020-04-10 | 2020-04-10 | WDM demultiplexer based on thin film interference filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212207744U (en) |
-
2020
- 2020-04-10 CN CN202020521063.2U patent/CN212207744U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105334580B (en) | A kind of wavelength division multiplexed light receiving unit | |
| US5521733A (en) | Optical switching device for wavelength-multiplexing optical communication | |
| CN106019484A (en) | Wavelength division multiplexer capable of being integrated in CFP and CFP2 standard high-speed transceivers | |
| US20160191192A1 (en) | Assembly of standard dwdm devices for use on free-space multiport dwdm devices | |
| CN109613654B (en) | Multichannel parallel wavelength division multiplexing/demultiplexing light splitting component and optical device thereof | |
| CN205899074U (en) | Wavelength -division multiplexing optical device and wavelength -decomposition multiplexing optical device | |
| CN105938222A (en) | Small-angle-type-filter-plate-based compact type wavelength division multiplexer | |
| CN206710650U (en) | OSA structures coexist in a kind of multi-wavelength | |
| CN212379610U (en) | Miniaturized multichannel wavelength division demultiplexing light receiving component | |
| US4589724A (en) | Multiple branching light wave guide element | |
| DE102015105446A1 (en) | Wavelength Multiplexing Device (WDM) and De-Multiplexing Device (WDDM) | |
| CN106019486A (en) | Wavelength division multiplexing optical device and wavelength division de-multiplexing optical device | |
| CN106094118A (en) | Tight type Wavelength-division multiplexer/demultiplexer | |
| CN212207744U (en) | WDM demultiplexer based on thin film interference filter | |
| CN101056153A (en) | Wave division multiplexer | |
| CN111929769A (en) | Multichannel wavelength division multiplexing module with compact structure | |
| CN115267975B (en) | Wavelength division multiplexer and wavelength division composite processing module | |
| CN216285820U (en) | Free space multiplex wavelength division multiplex device with turning structure | |
| CN101018098A (en) | Wave division multiplexer/demultiplexer and its making method | |
| CN206178194U (en) | Novel fine wavelength division multiplexing module of miniature tape trailer | |
| CN210348082U (en) | Wave splitting and combining optical assembly | |
| CN111443431A (en) | WDM demultiplexer based on thin film interference filter | |
| CN214201850U (en) | Mini type low-loss LAN-WDM passive optical module | |
| CN109116474A (en) | Wavelength-division multiplex/demultiplexing fiber coupling mould group and its optical device | |
| CN210605101U (en) | Multipath wavelength demultiplexing light receiving component based on optical waveguide |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |