Light mixer phase error correction method and structure

Abstract

The invention discloses a light mixer phase error correction method and structure and relates to the field of photonic integrated devices. The light mixer phase error correction method comprises the steps that a phase compensation zone is arranged on at least one connecting waveguide of a light mixer; the refractive index of part of an initial zone in the phase compensation zone is changed, the initial zone serves as a variable zone, a phase change value phi of the variable zone meets the requirement (shown in the description), wherein lambda represents light wavelength, L represents the length of the variable zone, n2 represents the refractive index of the variable zone, and n1 represents the refractive index of the initial zone. By adopting the light mixer phase error correction method,the structure is convenient to design and simple in manufacturing, the phase of the phase compensation zone is changed by a refractive index changing process, phase errors of the light mixer are corrected at a time, and the power consumption during device working is reduced compared with a traditional method introducing an additional thermal tuning structure.

Description

technical field [0001] The invention relates to the field of photonic integrated devices, in particular to a method and structure for correcting the phase error of an optical mixer. Background technique [0002] Coherent optical communication is the main solution for long-distance communication at present, and an integrated coherent receiver is a device at the receiving end of a coherent optical communication system. The optical mixer is an important part of the integrated coherent optical receiver, which is responsible for realizing the relative phase errors of signal light and intrinsic light at the four output ports of 0°, 80°, 170°, and 270°, respectively. [0003] Silicon-based integrated coherent receivers have the advantages of low cost and high integration, and are increasingly valued by the market. The silicon-based optical mixer in the silicon-based integrated coherent receiver realizes the phase adjustment of signal light and intrinsic light through structures su...

AI Technical Summary

Problems solved by technology

However, due to process errors, there is a phase error in the silicon-based optical mixer, which affects the yield of silicon-based integrated coherent receivers and even the entire silicon-based coherent integrated chip.

The existing technology is to add thermal electrodes to the waveguide in the silicon-based optical mixer, and to compensate the known phase error through thermal adjustment, but this method requires additional power supply for the thermal electrodes, which not only increases the pin count, also increases the power dissipation of the device

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