CN110737113A

CN110737113A - small-sized adjustable wavelength optical filter

Info

Publication number: CN110737113A
Application number: CN201810792203.7A
Authority: CN
Inventors: 李阳; 郑保忠; 庄世坚
Original assignee: Photop Technologies Inc
Current assignee: Photop Technologies Inc
Priority date: 2018-07-18
Filing date: 2018-07-18
Publication date: 2020-01-31

Abstract

The invention discloses small-sized tunable wavelength optical filters, which comprise an input/output unit, a collimator, an F-P etalon , an F-P etalon II and a plane mirror which are sequentially arranged, wherein the filtering characteristics of the F-P etalon and the F-P etalon II are both tunable, incident light is incident from the input end of the input/output unit and then collimated by the collimator, then sequentially filtered by the F-P etalon and the F-P etalon II, the incident light with specific wavelength is incident on the plane mirror, the plane mirror is perpendicular to a light path, the incident light is reflected along the original path, and then passes through the F-P etalon II, the F-P and the collimator again, and then is output from the output end of the input/output unit.

Description

small-sized adjustable wavelength optical filter

Technical Field

The invention relates to the field of optical communication devices, in particular to small-sized adjustable wavelength optical filters.

Background

The tunable wavelength optical filter is kinds of basic optical components, and its function is to select optical signals with specific wavelengths from a wide spectrum light source or multiple wavelength channels, it can be used in reconfigurable optical add-drop multiplexer (ROADM), optical cross-connect (OXC) system and sensor network in DWDM system.

At present, the main tunable optical filters include grating filters, F-P filters, mach-zehnder filters, electro-optic filters, and acousto-optic filters. The wavelength discrimination capability of the Mach-Zehnder filter is low, although the wavelength discrimination capability can be greatly improved by connecting a plurality of different Mach-Zehnder filters in series, the multistage tuning control difficulty is high, and the yield is low; the grating filter, the electro-optic filter and the acousto-optic filter are also relatively complex in process and low in yield.

Therefore, it is an urgent need to solve the problem of designing tunable optical filters with low cost and simple structure.

Disclosure of Invention

The invention aims to provide small-sized adjustable wavelength optical filters which have narrow bandwidth filter curves, compact structure, simple process and low cost.

In order to achieve the purpose, the invention adopts the following technical scheme:

A small-sized tunable wavelength optical filter comprises an input-output unit, a collimator, an F-P etalon , an F-P etalon II and a plane mirror which are sequentially arranged, wherein the filter characteristics of the F-P etalon and the F-P etalon II are tunable, incident light is incident from the input end of the input-output unit, collimated by the collimator, sequentially filtered by the F-P etalon and the F-P etalon II, incident light with specific wavelength is incident on the plane mirror, the plane mirror is perpendicular to a light path, reflected along the original path, passes through the F-P etalon II, the F-P etalon and the collimator again, and is output from the output end of the input-output unit.

, the FSRs of the F-P etalon and the second F-P etalon are different in size, the surfaces of the F-P etalon and the second F-P etalon are respectively plated with a heating resistor and a thermistor, and the filtering characteristics of the etalons are adjusted by changing the temperature.

Further , the input/output unit is a combination of a dual-fiber collimator, a circulator and a single-fiber collimator, or a combination of two single-fiber collimators.

By adopting the technical scheme, the two F-P etalons are respectively plated with the heating resistor and the thermistor, the wavelength adjustment of a filter curve can be realized by changing the temperature of the F-P etalon, so that the final filter wavelength is selected, and the device has the advantages of compact integral structure, low cost and easiness in realization.

Drawings

The invention is further described in with reference to the following figures and detailed description:

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating a filtering principle of an embodiment of the present invention;

FIG. 3 is a calculated filter curve of an embodiment of the invention;

FIG. 4 is a schematic structural diagram of an F-P etalon with a heating resistor and a thermistor coated on the surface;

FIG. 5 is a schematic structural diagram of a second embodiment of the present invention;

the reference numbers of 1, a double-fiber collimator, 2, an F-P etalon , 3, an F-P etalon II, 4, a plane reflector, 5, an etalon light-passing port, 6, a thermistor, 7, a heating resistor, 8, a circulator and 9, a single-fiber collimator.

Detailed Description

Example , as shown in fig. 1, the present invention includes a dual optical fiber collimator 1, an F-P etalon , a second F-P etalon 3 and a plane mirror 4 arranged in sequence, wherein the surfaces of the F-P etalon and the second F-P etalon 3 are coated with a heating resistor and a thermistor, and an input light is incident from an input end in of the dual optical fiber collimator 1, and then sequentially enters the F-P etalon and the second F-P etalon 3, and an input light having a specific wavelength is incident to the plane mirror 4 through the two F-P etalons, and the plane mirror 4 is perpendicular to an optical path, and reflects the incident light having the specific wavelength along the original optical path, and then sequentially enters the F-P etalon two 3 and the second F-P etalon 2, and then is output from an output end out of the dual optical fiber collimator 1, as shown in fig. 2, two F-P etalons having different FSR sizes are combined, a filter principle, schematically, as shown in fig. 2, a filter principle, a light having wavelengths of λ 1, λ 2, λ 3, …, λ 2, a bandwidth of a wavelength of light entering the dual optical fiber collimator 1, a filter, a wavelength of a single filter, a filter output light having a wavelength of.

In the second embodiment, as shown in fig. 5, the difference between the second embodiment and the embodiment is that circulators 8 and single fiber collimators 9 are used instead of the dual fiber collimator 1, and other implementation processes in the second embodiment are the same as those in the embodiment , and are not repeated here.

The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

The small adjustable wavelength optical filter is characterized by comprising an input-output unit, a collimator, an F-P etalon , an F-P etalon II and a plane mirror which are sequentially arranged, wherein the filter characteristics of the F-P etalon and the F-P etalon II are adjustable, incident light is incident from the input end of the input-output unit and then collimated by the collimator, then sequentially filtered by the F-P etalon and the F-P etalon II, the incident light with specific wavelength is incident on the plane mirror, the plane mirror is perpendicular to a light path, the incident light is reflected along the original path, and then passes through the F-P etalon II, the F-P etalon and the collimator again, and then is output from the output end of the input-output unit.
2. The miniature tunable wavelength optical filter of claim 1, wherein the FSRs of the F-P etalon and the second F-P etalon are different in size, and the surfaces of the F-P etalon and the second F-P etalon are respectively plated with a heating resistor and a thermistor, so that the filter characteristics of the etalons can be adjusted by changing the temperature.
3. The small tunable wavelength optical filter as claimed in claim 1 or 2, wherein the input/output unit is a dual-fiber collimator, a combination of a circulator and a single-fiber collimator, or a combination of two single-fiber collimators.