The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself however may be best understood by reference to the following detailed description of the invention, which describes certain exemplary embodiments of the invention, taken in conjunction with the accompanying drawings in which:
In cooperation with attached drawings, the technical contents and detailed description of the present invention will be as follows.
Please refer to
The optical transmitter 22 is comprised of a base seat 220 and a light-emitting component 224 that can be, for example, light-emitting diode (LED) or laser diode (LD), arranged on the base seat 220. An optical detector 226 is arranged under light-emitting component 224 and sealed relatively to base seat 220 by a cup shape lid 221, which in the meantime encloses both light-emitting component 224 and optical detector 226 to form a TO-can (Transistor Outline can) structure. The underside 225 of lid 221 is inclined 45 degrees to the beam path between optical transmitter 22 and optical fiber 3. The central part of lid 221 is a hollow window, on which a light splitting filter 222 is fixed. One side of the light splitting filter 222 facing optical receiver 23 is coated with a reflecting coating 227 that can make light beam coming from optical fiber 3 reflected vertically toward optical receiver 23. Another side of light splitting filter 222 facing optical transmitter 22 is also arranged with coating 228 that may make light beam coming from optical transmitter 22 directly pass through light splitting filter 222 and enter optical fiber 3 according to a transmission ratio set by the coating 228, while part of the light beam reflected by the coating 228 is received by the optical detector 226 to check if the laser light is transmitted normally. The side of light splitting filter 222 facing light-emitting component 224 is preferably arranged a focusing lens 223 to make the light beam emitted from light-emitting component 224 be more concentrated. In the same way, part of light beam functioned by focusing lens 22 is reflected by the coating 228 back to optical detector 226 for check.
Preferably, the optical receiver 23 may also be a TO-can framework, light-receiving surface of which may also preferably be arranged a focusing lens 231.
Please further refer to
Since the lid 221 of optical transmitter 22 and light splitting filter 222 is integrated as a TO-can framework instead of an individual light splitting filter in prior art, so the distances among light splitting filter, optical transmitter, optical receiver, and optical fiber are shortened. Not only make the total size of shell effectively shrunk, but also simplify production process and lower down manufacturing cost. In addition, the design of bi-directional optical transmitting and receiving device is more flexible.
Aforementioned structure is only a preferable embodiment of the present invention, being not used to limit its executing scope. Any equivalent variation and modification made according to appended claims is all covered by the claims claimed by the present invention.