Coupling method of optical receiving sub-module of optical module

Abstract

The invention relates to a coupling method of an optical receiving sub-module of an optical module. The coupling method comprises the following steps: S1, fixing a TIA, a PD, a DMUX and an adapter on a shell; S2, powering up the TIA and the PD through golden fingers of the shell, connecting a light source through an adapter, and arranging a glass block between the adapter and the DMUX; s3, selecting one path for coupling, fixing the position of one first lens in the light propagation direction of the path firstly, and then adjusting the position of the first lens; s4, adjusting and determining the position of a second lens between the adapter and the glass block; s5, removing the auxiliary coupled glass block, and arranging a third lens, an SOA and a fourth lens on the glass block; and S6, sequentially adjusting and determining the positions of the other first lenses. In the initial stage of coupling, the glass block is adopted to translate an optical path to replace the third lens, the SOA and the fourth lens for coupling, and the glass block is equivalent to the third lens, the SOA and the fourth lens, so that the coupling process is simplified.

Description

technical field [0001] The invention relates to the field of coupling technology, in particular to a coupling method of an optical receiving sub-module of an optical module. Background technique [0002] With the development of the optical communication industry, the data traffic that needs to be transmitted is increasing, so the requirements for the transmission rate of the optical module are also getting higher and higher. In recent years, optical modules that multiplex multiple wavelengths of light directly into an optical module for long-distance optical fiber transmission (such as 40kM, 80kM long-distance transmission) have become more and more widely used. Such as the 100G ER4 and 100G ZR4 optical modules that have been shipped in large quantities. The light-receiving sub-modules of these optical modules generally have the problems of complex process and difficult coupling. What kind of light coupling method is adopted will directly determine the success rate of light...

AI Technical Summary

Problems solved by technology

This coupling method requires an external high-speed lens and prism, the equipment structure is complex, the cost is high, and the coupling is difficult

[0005] The position of the collimated light coupled with lens 2 and lens 4 in the traditional way depends on the calibration of the machine, to be precise, it depends on the fixed position of the high-speed lens. If there is a deviation in the fixed position of the high-speed lens, the coupled collimated light will also exist. Deviation, which affects the coupling efficiency of the light coupled into the SOA by the subsequent lens 3 and the light coupled into the PD by the lens 1

[0006] The position of the collimated light coupled with the lens 2 and the lens 4 in the traditional way also depends on the position of the tube shell assembled on the coupling table. If there is a deviation in the assembly of the shell on the coupling table, there will be a deviation in the final collimated light path, so that Affects the coupling efficiency of light coupled into the SOA by the subsequent lens 3 and coupled into the PD by the lens 1

[0007] After the traditional coupling method, lens 2, lens 3, and lens 4 are coupled, then lens 1 is coupled. Since the position of the PD has been fixed at this time, the position of the PD relative to the collimated light has also been determined, so the relative position deviation between the PD and the collimated light Directly affects the coupling efficiency of the light finally coupled into the PD

[0008] Generally speaking, the traditional coupling method has very high requirements for equipment calibration, component placement accuracy and staff operation, and the process is relatively complicated and difficult to operate.

In addition, the coupling equipment is also more complicated, and two types of equipment are required for coupling collimated light (coupling lens 2 and lens 4) and coupling lens 1, and the cost is relatively high

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