Coupling structure for optical waveguide and optical device and optical alignment method by using the same

Abstract

A coupling structure for coupling an optical waveguide and an optical device is provided. The coupling structure enables to precisely align the optical waveguide and the optical device so that an optical-alignment error can be reduced within a range of a few mum. The coupling structure includes a first substrate, at least one optical waveguide formed on the first substrate to transmit an optical signal, optical alignment dummy waveguides symmetrically aligned on the first substrate about the optical waveguide, a second substrate bonded to the first substrate, at least one optical device mounted on a bottom surface of the second substrate and optically connected to the optical waveguide, and optical-alignment patterns formed at the bottom surface of the second substrate corresponding to the optical alignment dummy waveguides, wherein an optical alignment for the optical waveguide and the optical device is achieved by aligning the optical alignment dummy waveguides with the optical-alignment patterns.

Description

technical field [0001] The present invention relates to optical coupling between optical transmission media and optical devices. More specifically, the present invention relates to a coupling structure and optical alignment method for precisely centering the optical device to a planar lightwave circuit by bonding the optical device to a substrate using a flip chip bonding process . Background technique [0002] Due to the recent demand for data communication including audio and video signals in the Internet, conventional communication systems based on electrical signals have been replaced by optical communication systems. [0003] The optical communication involves converting electrical signals into light energy and then storing the light energy into electrical signals. To do this, it requires the use of an optical transmitter, an optical transmission medium and an optical receiver. PLC (Planar Lightwave Circuit) devices are mainly used as optical transmission media. LDs...

AI Technical Summary

Problems solved by technology

For this reason, although the conventional method is capable of mounting the substrate on the housing or the OSA by picking up the substrate formed with the V-shaped groove by using the guide pin, the pick-up device, the substrate The structure of sheet, housing and OSA is complex and undesirably large

In addition, according to the conventional method, the output power band of the transceiver is increased due to mechanical operation errors, and therefore, it is difficult to adjust the transmission characteristics as required

Furthermore, since the level of light received in the light detection device is not constant, it is difficult to adjust the sensitivity of the operating device

Finally, in order to reduce mechanical operation errors in the main components, the manufacturing cost will increase, and as a result, the price competitiveness of the product will be damaged

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