Structural Design And Performance Simulation Of Multi-channel Parallel Optical Modules

The storm of information brought by the age of Big Data creates a increasing demand for high bandwidth, high-speed information transmission. Because of its characteristics of large capacity, low loss, optical communication is gradually becoming one of the main means of communication. The optical transceiver module, as one of the important devices to achieve optical-to-electric signal conversion, its product requirement is growing. With the escalation of data channels, the number of channels of parallel optical modules also requires more. Thus it is a trend for optical modules to be high-speed, high-density, low-cost. The paper will concentrate on the research of high-speed parallel optical modules.In this thesis, we firstly introduce the development and application status of high-speed parallel optical modules, systematically describing its composition and structure. Then we educe the coupling structure between VCSEL arrays and fiber arrays which is one of the key technologies. Several existing realization plans of the coupling structure will be showed in this paper along with their advantages and disadvantages. Afterwards, we propose a new two-dimensional optical interconnection module having a 45° reflection surface. The structure aims to couple the light beam emitted from the VCSEL into fibers high-efficiently. The beam totally reflects at the reflection surface and turn to be horizontal to the circuit board. Based on the ABCD rule of Gaussian beams and the method of overlap integral, the optical coupling efficiency is calculated with Matlab. According to the simulation results, the coupling efficiency achieves 87.96% where the distance between the VCSEL and the optical fiber H equals to 25μm. With increasing H, the light coupling efficiency shows a downward trend. Otherwise, we analyze and conclude the effect on the coupling efficiency brought by reflection increasing film and micro lens arrays through a simulation software. Considering the errors that may exit in the process of real production, this paper discusses about the influences of axial offset, angular offset and lateral excursion, getting coupling tolerances as well. The main conclusion includes: coating and bonding micro lens arrays can significantly enhance the coupling efficiency; the lateral excursion has a greater impact on coupling efficiency than the axial offset;the tolerance of angular offset is 5°. The simulation results can guide the production of optical module. Meanwhile, the two-dimensional optical interconnection module advanced in this thesis meets the requirement of high density and miniaturized package, solving the difficulties of high manufacturing cost, lack of available channels, miniaturized package and other issues. It will have broad prospect of application.