Filtering structures based on optical waveguide and filtering film

Abstract

The invention relates to the field of optical communication devices, and discloses a filtering structure based on an optical waveguide and a filtering film. The filtering structure comprises an input optical fiber, a guide optical fiber and at least one optical waveguide chip which is pressed between the input optical fiber and the guide optical fiber; the end surface of the optical waveguide chip is pressed against the end surface of the guide optical fiber; and a filtering film layer is deposited on at least one of the end surface of the optical waveguide chip and the end surface of the guide optical fiber which are pressed against each other. The invention also discloses another filtering structure based on the optical waveguide and the filtering film, wherein a filtering film layer is deposited on at least one end surface of two optical waveguide chips which are pressed against each other. By the filtering structures, longer-distance transmission of light in a free space is avoided, so that the use of a collimator and related lenses is avoided; and therefore, the cost can be saved, and meanwhile, the integration of a plurality of filters can be facilitated.

Description

technical field

[0001] The invention relates to the field of optical communication equipment, in particular to a filter structure without using a collimator and a lens. Background technique

[0002] Optical communication is communication based on light waves. Optical filters are key devices in optical communications, especially in the field of optical wavelength division multiplexing (WDM). At present, the main types of optical filters are: film type, grating type, waveguide type, etc. Among them, the thin-film filter (TFF) has the characteristics of high technical maturity and flexible filtering characteristics, and is currently widely used.

[0003] Thin film filters (TFF) usually need to form wavelength division multiplexing devices with the cooperation of collimators. The light in the optical fiber propagates in free space after being collimated by the collimator, and is reflected and transmitted by the thin-film filter for a specific wavelength of light. filtering f...

Examples

Embodiment 1

[0018] Such as figure 1 , a filtering structure based on an optical waveguide and a filter film, including an input optical fiber 1 , an optical waveguide chip 2 , a guiding optical fiber 3 and a guiding optical fiber 4 . Wherein the input optical fiber 1 and the guiding fiber 3 are pasted on one end of the optical waveguide chip 2, and the guiding fiber 4 is pasted on the opposite end surface of the optical waveguide chip 2. In this embodiment, the guiding fiber 4 and the optical waveguide chip 2 are pasted There is a filter film layer 5 on the end face of the guiding fiber 4 . In other embodiments, it can also be deposited on the end face of the guiding fiber 4 .

[0019] The optical carrier signal is injected into the optical waveguide chip 2 by the input optical fiber 1, and is injected on the filter film layer 5 on the opposite end face of the optical waveguide chip 2, and demultiplexed by the filter film layer 5, and one of the optical carriers is transmitted from the g...

Embodiment 2

[0021] Such as figure 2 , a filter structure based on optical waveguide and filter film, including input optical fiber 1, optical waveguide chip 2a, optical waveguide chip 2b, guiding optical fiber 3 and guiding optical fiber 4. Wherein the input optical fiber 1 and the guiding fiber 3 are pasted on one end of the optical waveguide chip 2a, the optical waveguide chip 2a and the optical waveguide chip 2b are pasted together, and the guiding fiber 4 is pasted on the opposite end face of the optical waveguide chip 2b. In this embodiment, There is a filter film layer 5 on the end surface where the optical waveguide chip 2a and the optical waveguide chip 2b are bonded. In other embodiments, it can also be deposited on the end face of the optical waveguide chip 2b.

[0022] The optical carrier signal is injected into the optical waveguide chip 2a by the input optical fiber 1, and is injected on the filter film layer 5 on the opposite end face of the optical waveguide chip 2a. The...

Embodiment 3

[0024] Such as image 3 , a structure based on Embodiment 1 through the arrangement of optical fibers and optical waveguide chips to realize a serial filter. The upper end surface of one side of the optical waveguide chip 2 is abutted with an input optical fiber 1, the middle and lower end surface of this side is abutted with guiding optical fibers 402, 404, 406, 408, and the other end surface is abutted with guiding optical fibers 401, 403, 405, 407. The optical carrier signal is injected into the optical waveguide chip 2 by the input optical fiber 1, and is injected on the filter film layer 5 on the opposite end face of the optical waveguide chip 2, and is demultiplexed through the filter film layer 5, wherein the first optical carrier is passed through The guide fiber 401 is transmitted, and other optical carriers are reflected to the filter film layer on the end face of the guide fiber 402, and demultiplexed by the filter film layer, wherein the second optical carrier is ...

technical field

[0001] The invention relates to the field of optical communication equipment, in particular to a filter structure without using a collimator and a lens. Background technique

[0002] Optical communication is communication based on light waves. Optical filters are key devices in optical communications, especially in the field of optical wavelength division multiplexing (WDM). At present, the main types of optical filters are: film type, grating type, waveguide type, etc. Among them, the thin-film filter (TFF) has the characteristics of high technical maturity and flexible filtering characteristics, and is currently widely used.

[0003] Thin film filters (TFF) usually need to form wavelength division multiplexing devices with the cooperation of collimators. The light in the optical fiber propagates in free space after being collimated by the collimator, and is reflected and transmitted by the thin-film filter for a specific wavelength of light. filtering f...

Examples

Embodiment 1

[0018] Such as figure 1 , a filtering structure based on an optical waveguide and a filter film, including an input optical fiber 1 , an optical waveguide chip 2 , a guiding optical fiber 3 and a guiding optical fiber 4 . Wherein the input optical fiber 1 and the guiding fiber 3 are pasted on one end of the optical waveguide chip 2, and the guiding fiber 4 is pasted on the opposite end surface of the optical waveguide chip 2. In this embodiment, the guiding fiber 4 and the optical waveguide chip 2 are pasted There is a filter film layer 5 on the end face of the guiding fiber 4 . In other embodiments, it can also be deposited on the end face of the guiding fiber 4 .

[0019] The optical carrier signal is injected into the optical waveguide chip 2 by the input optical fiber 1, and is injected on the filter film layer 5 on the opposite end face of the optical waveguide chip 2, and demultiplexed by the filter film layer 5, and one of the optical carriers is transmitted from the g...

Embodiment 2

[0021] Such as figure 2 , a filter structure based on optical waveguide and filter film, including input optical fiber 1, optical waveguide chip 2a, optical waveguide chip 2b, guiding optical fiber 3 and guiding optical fiber 4. Wherein the input optical fiber 1 and the guiding fiber 3 are pasted on one end of the optical waveguide chip 2a, the optical waveguide chip 2a and the optical waveguide chip 2b are pasted together, and the guiding fiber 4 is pasted on the opposite end face of the optical waveguide chip 2b. In this embodiment, There is a filter film layer 5 on the end surface where the optical waveguide chip 2a and the optical waveguide chip 2b are bonded. In other embodiments, it can also be deposited on the end face of the optical waveguide chip 2b.

[0022] The optical carrier signal is injected into the optical waveguide chip 2a by the input optical fiber 1, and is injected on the filter film layer 5 on the opposite end face of the optical waveguide chip 2a. The...

Embodiment 3

[0024] Such as image 3 , a structure based on Embodiment 1 through the arrangement of optical fibers and optical waveguide chips to realize a serial filter. The upper end surface of one side of the optical waveguide chip 2 is abutted with an input optical fiber 1, the middle and lower end surface of this side is abutted with guiding optical fibers 402, 404, 406, 408, and the other end surface is abutted with guiding optical fibers 401, 403, 405, 407. The optical carrier signal is injected into the optical waveguide chip 2 by the input optical fiber 1, and is injected on the filter film layer 5 on the opposite end face of the optical waveguide chip 2, and is demultiplexed through the filter film layer 5, wherein the first optical carrier is passed through The guide fiber 401 is transmitted, and other optical carriers are reflected to the filter film layer on the end face of the guide fiber 402, and demultiplexed by the filter film layer, wherein the second optical carrier is ...

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