Adjustable coherence detector structure

Abstract

The invention discloses an adjustable coherence detector structure. The adjustable coherence detector structure comprises two input waveguides connected with a 2*4 multimode coherence coupler, the 2*4 multimode coherence coupler used for demodulating two pairs of synchronizing signals, an adjustable electrode used for causing local refraction rate variation, a 2*2 multimode coherence coupler used for translating the synchronizing signals into orthogogonal signals, four output waveguides and two pairs of balance detectors, wherein the output end of the 2*4 multimode coherence coupler is directly connected with the input end of the 2*2 multimode coherence coupler, and the adjustable electrode is positioned above the joint of the two multimode coherence couplers; and the two output waveguides are connected with the output end of the 2*4 multimode coherence coupler, the other two output waveguides are connected with the output end of the 2*2 multimode coherence coupler, and the two pairs of balance detector are used for collimating the four output waveguides. The adjustable coherence detector structure provided by the invention can be used for realizing signal demodulation in an achiasmate manner, and is larger in tolerance and operation bandwidth.

Description

technical field [0001] The invention relates to an optoelectronic device for communication, in particular to an adjustable coherent detector structure which realizes signal demodulation without crossover and has larger tolerance and working bandwidth. Background technique [0002] In recent years, 100Gbit / s coherent optical fiber communication systems have been extensively studied. The integrated coherent receiver is one of the key components of high-speed coherent communication systems. It includes polarization beam splitters, 90-degree optical hybrids, balanced detectors and transimpedance Basic components such as amplifiers. Among these components, 90-degree optical hybrids can be divided into three categories: free space type, optical fiber type and waveguide type according to the realization form. Among them, the free-space type and the optical fiber type have commercial separation devices, but these separation devices are too large to be integrated with other compone...

AI Technical Summary

Problems solved by technology

[0006] 1. The phase introduced by the butterfly waveguide can only be very accurate for a certain wavelength, and there will be deviations for other wavelengths, and the 90-degree optical hybrid itself is a broadband device, so the butterfly waveguide will limit its operating bandwidth

[0007] 2. The butterfly waveguide itself introduces a certain loss

[0008] 3. Butterfly waveguides have smaller manufacturing tolerances than multimode coherent couplers, and have very high process requirements, so they are not suitable for mass production

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