We report a scheme for optical coupling between the chip and the laser off the chip by means of combining lens coupling and edge coupling. Two lenses with aspherical surfaces are employed in the lens coupling, which the first lens collimates the laser source light and the second lens focus the light. And the edge coupling is accomplished by a triple-tip spot-size converter (SSC). The simulation studies of proposed method are described in detail. Simulation results show that perfect lens coupling can be generated, and the maximum coupling efficiency is 87.7%. For the edge coupling, the triple-tip SSC contains one central taper and two side waveguides that locate at both sides of the central taper equidistantly. After calculating by the 3-D finite-difference time-domain (FDTD), low coupling loss of 0.53 dB can be realized. The proposed scheme with simple structure, low cost, and high coupling efficiency has potential applications on coherent communication systems, the high-speed optical module, and integrated optical communication systems.
As a key link in the practical application of optical modules, the packaging technology of optoelectronic devices plays a crucial role in the performance of products. Among them, the optical coupling technology is an important link in the packaging design process, and the lensed fiber coupling method still occupies a large proportion in the packaging technology due to its simple structure and low cost. In this paper, by adjusting the parameters of the taper angle and curvature radius of the lensed fiber, a simulation model of the optical coupling between the lensed fiber and commercial lasers is established, and the optical coupling efficiency and optical tolerance of the lensed fiber under different horizontal coupling distances and angular offsets are analyzed in detail. In addition, the coupling performance of the lensed fiber with two different manufacturing processes, the ground- cone lensed fiber (GCLF) and the fused-cone lensed fiber (FCLF), was compared and analyzed. According to the comparative analysis results, under the optimal parameters, the maximum coupling efficiency of GCLF reaches 89.35%, and the maximum coupling efficiency of FCLF reaches 85.59%. By adjusting the alignment angle of the laser light source in the horizontal and vertical directions, the 3db alignment tolerances of GCLF in two directions are 2.17μm and 2.05μm, respectively, and the 3db alignment tolerances of FCLF in two directions are 2.08μm and 1.96μm, respectively. From this, it can be seen that GCLF has higher coupling performance than FCLF, and a higher alignment tolerance during the package alignment process.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.