Patent ID: 6892009

Claim:
An optical device, comprising: a block having a first positioning portion and a second positioning portion defined therein; first and second light guides positioned in the first positioning portion in an aligned relation to each other, opposing ends of the first and second light guides being angled at a certain angle; a filter positioned in the second positioning portion and between the opposing ends of the first and second light guides so that the angled opposing ends substantially contact with opposite surfaces of the filter, respectively, the filter bearing a filtering layer for reflecting light having a first wavelength and transmitting light having a second wavelength; a light receiver for receiving the light reflected by the filtering layer; and an adhesive filled between at least one neighboring members selected among the block, the first and second light guides, the filter, and the light receiver, the adhesive having substantially the same refractive index as those of the neighboring members and transmitting the light between the neighboring members.