Optical module, optical connector cable, and method for producing optical module

An optical module comprising:

• a substrate including a glass cloth therein;
• a plurality of optical elements mounted on the substrate;
• a plurality of optical coupling modules configured to be optically coupled to the plurality of respective optical elements;
• and
• adhesives respectively fixing the plurality of optical coupling modules to the substrate,
• wherein a plurality of cavities recessed from a first main surface of the substrate toward a second main surface of the substrate so as to each include a bottom portion are formed in the substrate, and each of the plurality of optical coupling modules is accommodated in each of the plurality of cavities,
• the glass cloth includes a plurality of protruding portions protruding into the plurality of cavities from respective side surfaces of the plurality of cavities, and
• the plurality of protruding portions are respectively stuck into the adhesives positioned between the respective side surfaces and the plurality of optical coupling modules.

A method for manufacturing an optical module comprising:

• preparing a substrate including a glass cloth;
• forming a cavity recessed from a first main surface of the substrate toward a second main surface of the substrate in the substrate so as to include a bottom portion;
• and
• accommodating at least a part of an optical coupling module configured to be optically coupled to an optical element inside the cavity and fixing the optical coupling module to the substrate using an adhesive,
• wherein in the forming the cavity, a part of the glass cloth is caused to protrude into the cavity from a side surface of the cavity as a protruding portion, and
• in the fixing the optical coupling module to the substrate, the adhesive is applied to the inside of the cavity such that the protruding portion is stuck into the adhesive.