Apparatus for alleviating nonlinear temperature effect of arrayed waveguide gratings

An apparatus for alleviating a nonlinear temperature effect of an arrayed waveguide grating comprising an integrated optical circuit base for an arrayed waveguide grating chip and an actuator, characterized in that:

• the integrated optical circuit base includes a first region, a second region and a hinge connecting the first region and the second region, the hinge allows the first region and the second region to rotate and/or translate relative to each other;
• the arrayed waveguide grating chip is fixedly disposed on the integrated optical circuit base, the arrayed waveguide grating chip is divided into two parts, which are fixed on the first region and the second region of the integrated optical circuit base, respectively;
• the actuator includes two or more actuating rods having a thermal expansion coefficient different from that of the integrated optical circuit base, wherein:
• in different temperature ranges, the first region and the second region are mainly driven by different actuating rods to rotate and/or translate relative to each other at the hinge, so that the first region and the second region have a nonlinear displacement as the temperature changes, which brings the two parts of the arrayed waveguide grating chip to move relative to each other to accurately compensate drifting of a central wavelength of the arrayed waveguide grating chip in the different temperature ranges;
• wherein the actuator includes a first actuating rod and at least one of a second actuating rod, and a third actuating rod which are fixedly connected to the first region and the second region of the integrated optical circuit base, the second actuating rod and the third actuating rod have the aperture provided in the middle parts thereof or between the second and third actuating rods and the first or second region of the integrated optical circuit base, the second actuating rod forms an overcompensation structure, and the third actuating rod forms an under-compensation structure, the actuating rods have a thermal expansion coefficient, an effective length and a leverage factor satisfying the following relation:
• k2×L2×∂2>k1×L1×∂1>k3×L3×∂3, where L1, ∂1, k1 are the effective length, the thermal expansion coefficient and the leverage factor relative to the base of the first actuating rod, L2, ∂2, k2 are the effective length, the thermal expansion coefficient and the leverage factor relative to the base of the second actuating rod, and L3, ∂3, k3 are the effective length, the thermal expansion coefficient and the leverage factor relative to the base of the third actuating rod.