Patent ID: 10921535

Abstract:
An optical sub-assembly comprising a filtering optical module, a light emitting module having a light emitting device (LED), at least a light receiving module, at least one wavelength filter, a fibre optic connector and cable having a fiber optic, and a telescopic-shaped core cylinder module having at least two tapered diameter core portions and at least a gel coating layer over an inner surface thereof is provided. A first optical signal of the light emitting device is directed to the tapered diameter core portions, the at least one wavelength filter, and onto the fibre optic. The telescopic-shaped core cylinder module is configured to perform isolation on optical signals via the tapered diameter core portions, taperedly shrinking the area for reflected light to impinge on the LED, and the at least a gel coating layer absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions.