KR20070019137A - Flat optical waveguide with wavelength division multiplexing filter and its manufacturing method - Google Patents

Abstract

The present invention relates to a flat type optical waveguide having a wavelength division multiplexing filter and a method for manufacturing the same in a structure using a bidirectional flat type optical waveguide, and an attachment type and an optical waveguide directly attaching a wavelength division multiplexing filter to a flat type optical waveguide. A filter coating type for coating a wavelength division multiplexing filter directly on a cross section. The planar optical waveguide having the wavelength division multiplexing filter of the present invention is characterized by directly attaching an optical filter for reflecting and transmitting light by selecting only a specific wavelength on the cross section of the optical waveguide. According to the present invention, the manufacturing process of the optical waveguide can be simplified, the process cost can be reduced, and the process can be simplified.

Flat waveguide, wavelength division multiplexing

Description

Flat waveguide with wavelength-division multiplexing filter and its manufacturing method {Architecture of Optical WDM Filter on Planar Lightwave Circuit and Manufacturing Method}

1a and 1b is a structure of a wavelength division multiplexed filter coating type according to an embodiment of the present invention.

2A and 2B are cross-sectional views of a wavelength division multiplexing filter attachment structure according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: submount 2: wavelength division multiplexed coating surface

3: photodiode for light reception 4: TIA (Trans Impedance Amplifier)

5: Integrated laser diode (LD) and monitor photodiode (mPD)

6: optical waveguide (wave guide)

7: planar optical waveguide (PLC) 8: silicon wafer

10: silica cladding 11: silica core

21: wavelength division multiplexing filter 22: silicon optical bench including photodiode

The present invention relates to a flat type optical waveguide having a wavelength division multiplexing filter and a method for manufacturing the same in a structure using a bidirectional flat type optical waveguide, and more particularly, an attachment for directly attaching a wavelength division multiplexing filter of a flat optical waveguide. The present invention relates to a filter-coated optical waveguide and a method for manufacturing the same.

Currently used flat optical waveguides (PLCs) form a cladding and a core of silica or polymer on a silicon wafer to form an optical waveguide through which an optical signal can proceed. In the transmission of an optical signal of bidirectional propagation to such an optical waveguide, a wavelength division multiplexing filter inserting structure is used in which a wavelength division multiplexing filter which cuts a specific position of the optical waveguide to make a groove and then reflects and transmits only a specific wavelength is inserted. The current structure is limited in mass production because it requires a process of precisely cutting a specific position of a flat optical waveguide (PLC) and inserting a filter to insert a wavelength division multiplexing filter.

Therefore, in order to solve the above problems, the method of forming the wavelength division multiplexing filter needs to be improved, and in view of this, a new method for mounting the wavelength division multiplexing filter without inserting the existing wavelength division multiplexing filter is needed. will be.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an optical waveguide and a method of manufacturing the same, which are equipped with a wavelength division multiplexing filter without inserting a wavelength division multiplexing filter.

In order to solve the above problems, the present invention according to the first aspect of the present invention provides a flat optical waveguide for bidirectional mounting in which an optical element and an optical waveguide are mounted, and reflects and transmits light by selecting only a specific wavelength on a cross section of the optical waveguide. Provided is a planar optical waveguide having a wavelength division multiplexing filter comprising an optical filter coating layer. In this case, the optical filter is preferably a wavelength division multiplexing (WDM) filter.

According to the second aspect of the present invention, in the bidirectional flat optical waveguide in which the optical element and the optical waveguide are mounted, an optical filter for directly reflecting and transmitting light by selecting only a specific wavelength is attached directly to the end face of the optical waveguide. A flat optical waveguide in which a wavelength division multiplexing filter is formed is provided. In this case, the optical filter is preferably a wavelength division multiplexing (WDM) filter.

The present invention comprises the steps of: forming an optical waveguide including a core and a clad to manufacture the planar optical waveguide of the present invention according to the first aspect; And coating one side of the optical waveguide with a wavelength division multiplexing filter to cover the core part.

In addition, the present invention comprises the steps of forming an optical waveguide comprising a core and a clad to produce a planar optical waveguide of the present invention according to the second aspect; And directly attaching a wavelength division multiplexing filter to one side of the optical waveguide so as to cover the core portion.

As described above, in the present invention, the optical waveguide filter is a new method of forming a wavelength division multiplexing filter that selects and reflects and transmits only a desired wavelength in a structure using a bidirectional flat optical waveguide (PLC) mounted with an optical device and an optical waveguide. The same wavelength division multiplexing as the direct wavelength division multiplexing coating directly attached to the cross-section of the flat-type optical waveguide and the direct-attach wavelength division multiplexing filter directly attached to the PLC cross-section without cutting and inserting the flat optical waveguide (PLC) to insert the A wavelength division multiplexed coating type for coating is proposed.

This method can reduce the process cost by eliminating the cutting process of the flat optical waveguide, which is simpler and more accurate than the conventional process, and the wavelength division multiplexing coating type is required for manufacturing the wavelength division multiplexing filter. Since no glass is used, cost savings can be maximized.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to the components of the following drawings, the same components only have the same reference numerals as much as possible even if displayed on different drawings, it is determined that may unnecessarily obscure the subject matter of the present invention Detailed descriptions of well-known functions and configurations will be omitted.

1A is a perspective view of a wavelength division multiplexing filter coated type according to an embodiment of the present invention.

The wavelength division multiplexing filter presented as the above embodiment schematically shows a method of coating on one side of the optical waveguide.

The optical waveguide including the wavelength division multiplexing filter of the present invention converts the current signal generated from the submount (1), the wavelength division multiplexing filter coating (2), the photoreceiving photodiode (3), the photodiode into a voltage signal, and It includes a TIA (transimpedance amplifier) 4, a laser diode 5, an optical waveguide (wave guard) 6, and a planar lightwave circuit (PLC) 7 for amplifying.

Referring to FIG. 1A, a planar optical waveguide 7 of optical signals traveling in both directions using an optical waveguide 6 in a bidirectional flat optical waveguide (PLC) structure in which an optical device and an optical waveguide are mounted is shown. By using the wavelength division multiplexing filter 2, the optical signal to be moved to the photodiode is blocked so as not to proceed to the laser diode 5, and also passes through the wavelength division multiplexing filter to enter the photodiode 3. .

FIG. 1B shows only an optical waveguide with a wavelength division multiplexing filter, which includes a silicon wafer 8, a silica cladding 10, a silica core 11, and a wavelength division multiplexing filter coating 2. . In the optical waveguide of FIG. 1B, the wavelength division multiplexing filter is coated on one side of the optical waveguide.

Referring to FIG. 1B, the optical signal emitted from the laser diode is reflected by the wavelength division multiplexing (WDM) filter without being incident on the photodiode and travels along the optical waveguide. The planar optical waveguide comprises a silicon cladding 10 and a silica core 11 as a substrate.

WDM (Wavelength Division Multiplexing) filter coating is an optical filter that functions to pass a specific wavelength band and reflect the remaining wavelengths by depositing more than 100 layers of thin films on the cross section of the optical waveguide according to the optical design.

2A is a perspective view of an optical waveguide package directly attaching a wavelength division multiplexing filter according to another exemplary embodiment of the present invention.

In the above embodiment, the optical waveguide package to which the wavelength division multiplexing filter is directly attached includes a silicon optical bench (SiOB) 22 including a wavelength division multiplexing filter 21 and a photodiode 22, a TIA 4, and a laser. A diode 5, an optical waveguide (wave guide) 6 and a planar optical waveguide (PLC) 7.

This embodiment schematically shows how the wavelength division multiplexing filter is directly attached.

Referring to FIG. 2A, the structure of the optical waveguide package to which the wavelength division multiplexing filter is directly attached is substantially similar in structure to the optical waveguide package of FIG. 1A. FIG. 2B is a perspective view showing only an optical waveguide portion directly attaching the wavelength division multiplexing filter. Referring to FIG. 2B, it can be seen that the multiplexing filter is directly attached to cover the entire cross section of the silica core.

Directly adhere the filter to the cross section of the optical waveguide and fill the space with refractive index matching oil having the same refractive index as the core of the optical waveguide to prevent the refraction of light that may occur in the cross section of the optical waveguide and the space between the filter. give. Thereafter, the silicon epoxy is used to attach the filter and the optical waveguide and then emit UV light to cure the silicon epoxy.

In the present invention, a filter is inserted into an optical waveguide as a new method of forming a wavelength division multiplexing filter that selects, reflects, and transmits only a desired wavelength in a structure using a bidirectional flat optical waveguide (PLC) mounted with an optical device and an optical waveguide. Instead of cutting and inserting the flat optical waveguide, a wavelength-division multiplexing coating similar to the direct-attach type and the direct wavelength division multiplexing coating on the cross section of the flat optical waveguide is directly attached to the cross section of the flat optical waveguide without cutting and inserting the flat optical waveguide. A wavelength division multiplexed coating type is proposed.

This method can reduce the process cost by eliminating the cutting process of the flat optical waveguide, which is simpler and more accurate than the conventional process, and the wavelength division multiplexing coating type is required for manufacturing the wavelength division multiplexing filter. Since no glass is used, cost savings can be maximized.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that it can be changed.

As described above, according to the present invention, the manufacturing process of the optical waveguide can be simplified, and the process cost can be reduced and the process can be simplified.

Claims (6)

A bidirectional flat optical waveguide in which an optical element and an optical waveguide are mounted, And an optical filter coating layer for reflecting and transmitting light by selecting only a specific wavelength on a cross section of the optical waveguide. The planar optical waveguide according to claim 1, wherein the optical filter is a wavelength division multiplexing (WDM) filter. A bidirectional flat optical waveguide in which an optical element and an optical waveguide are mounted, A flat type optical waveguide having a wavelength division multiplexing filter, wherein an optical filter for reflecting and transmitting light by selecting only a specific wavelength is directly attached to a cross section of the optical waveguide. 4. The flat optical waveguide according to claim 3, wherein the optical filter is a wavelength division multiplexing (WDM) filter. Forming an optical waveguide comprising a core and a clad; And And coating one side of the optical waveguide with a wavelength division multiplexing filter to cover the core portion. Forming an optical waveguide comprising a core and a clad; And And attaching a wavelength division multiplexing filter directly to one side of the optical waveguide so as to cover the core portion.

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