Apparatus and method for realising bilinear temperature compensation of array waveguide grating

Patent metadata

Field	Value
Publication number	US-10969545-B2
Application number	US-201716759795-A
Country	US
Kind code	B2
Filing date	Dec 25, 2017
Priority date	Aug 30, 2017
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

An apparatus and method for temperature compensation, belonging to the technical field of optical communications, and particularly an apparatus and method for implementing bilinear temperature compensation of an arrayed waveguide grating is disclosed. The apparatus consists of two drivers. A first driver performs linear compensation in a range lower than normal temperature 25° C. to −40° C. (low-temperature area) or a range higher than ambient temperature 25° C. to 85° C. (high-temperature area). A second driver is used to realize nonlinear compensation of superimposed effect of AWG chip wavelength/temperature in another temperature area. Two parts of the chip after being divided have different relative displacement/effective compensation amounts in different temperature ranges, having over-compensation in the high-temperature area and under-compensation in the low-temperature area, so that a center wavelength of the AWG chip appears as two gentle curves with temperature change. The residual nonlinear temperature effect is effectively reduced.

First claim

What is claimed is:

1. An apparatus for bilinear temperature compensation of an arrayed waveguide grating, comprising a first driver having a first driving rod, the two ends of which are respectively connected to a first subsection and a second sub-section of an AWG chip being relatively movable with each other,
wherein the apparatus further comprises:
a second driver having a second driving rod with a deformation amount different from that of the first driving rod in a part of a temperature range, one end of the second driving rod being connected to a first subsection of the AWG chip, and the other end being detachably in contact with a force-bearing end face which is relatively fixed to the end face of the first driving rod on the second sub-section;
the first driving rod being provided with a retractable and/or rotatable elastic portion.

2. The apparatus for bilinear temperature compensation of an arrayed waveguide grating according to claim 1 , wherein a ball is provided between the second driving rod and the force-bearing end face;
and/or,
an end face of the second driving rod being in contact with the force-bearing end face is in a pointed shape or an arc shape.

3. The apparatus for bilinear temperature compensation of an arrayed waveguide grating according to claim 1 , wherein the first driving rod is L-shaped, one side of which is parallel to the second driving rod, and the other side acting as the force-bearing end face is perpendicular to an end face of the second driving rod.

4. The apparatus for bilinear temperature compensation of an arrayed waveguide grating according to claim 1 , wherein the first driving rod and the second driving rod have an identical thermal expansion coefficient but different lengths.

5. The apparatus for bilinear temperature compensation of an arrayed waveguide grating according to claim 1 , wherein a length L 1 of the first driving rod and a length L 2 of the second driving rod are subject to following conditions:
Wα=L 1 *∂ 1 +L 2 *∂ 2

α= k 1 +r*k 2

where k 1 is an expansion and contraction quantity of the first driver caused by thermal expansion and contraction per temperature unit; k 2 is an expansion and contraction quantity of the second driver caused by thermal expansion and contraction per temperature unit; r is a proportion coefficient which relates to rigidity and structural shape of the two drivers and may be obtained by a stress analysis calculation simulation or experiment; ∂ 1 is a linear expansion coefficient of the first driving rod, ∂ 2 is a linear expansion coefficient of the second driving rod; α is a movement distance per temperature unit; and w is a compensation amount.

6. The apparatus for bilinear temperature compensation of an arrayed waveguide grating according to claim 1 , wherein a number of the second driving rods is two and the second driving rods have an identical expansion coefficient as the first driving rod, one of the second driving rods having a length greater than that of the first driving rod, and the other having a length smaller than that of the first driving rod.

7. A method for bilinear temperature compensation of an arrayed waveguide grating, wherein the method comprises:
driving two subsections of an AMG chip to relatively move with each other by a first driving rod connecting the two subsections of the AMG chip when a temperature varies;
providing a second driving rod between the two subsections of the AWG chip, one end of the second driving rod being in a detachable contact with a force-bearing end face, and a position of the force-bearing end face and one end face of the first driving rod is relatively fixed; and
varying an elastic deformation of the first driving rod by a deformation amount of the second driving rod different from that of the first driving rod.

8. The method for bilinear temperature compensation of an arrayed waveguide grating according to claim 7 , wherein in a part of temperature range, the first driving rod deforms due to the contact of the second driving rod with the force-bearing end face; in a part of temperature range, the deformation of the first driving rod recovers due to a separation of the second driving rod from the force-bearing end face.

9. The method for bilinear temperature compensation of an arrayed waveguide grating according to claim 7 , wherein a length of the second driving rod is greater than that of the first driving rod at a normal temperature; and
when a temperature is above the normal temperature, an expansion amount of the second driving rod is greater than that of the first driving rod, such that the second driving rod stretches the first driving rod;
when the temperature is below the normal temperature, a contraction amount of the second driving rod is greater than that of the first driving rod, such that the second drive rod is separated from the force-bearing end face.

10. The method for bilinear temperature compensation of an arrayed waveguide grating according to claim 7 , wherein at a normal temperature, a length of the second driving rod is smaller than that of the first driving rod; and
when a temperature is above the normal temperature, an expansion amount of the second driving rod is smaller than that of the first driving rod, such that the second drive rod is separated from the force-bearing end face;
when the temperature is below the normal temperature, a contraction amount of the second drive rod is smaller than that of the first drive rod, such that the second driving rod comes into contact with the force-bearing end face to deform the first driving rod.

Assignees

• Accelink Tech Co Ltd

Inventors

• Ling Jiuhong
• Wu Fan
• Kong Xiangjian
• Li Changan
• Hu Jiayan

Classifications

• G02B6/1203 Primary

  using mounting means, e.g. by using a combination of materials having different thermal expansion coefficients · CPC title

• G02B6/12011

  characterised by the arrayed waveguides, e.g. comprising a filled groove in the array section · CPC title

• G02B6/12016

  characterised by the input or output waveguides, e.g. tapered waveguide ends, coupled together pairs of output waveguides · CPC title