@article{78062520381d430aa1d0ea6fe8492fd8,
title = "Microprism for wide-angle low-loss y-junction waveguide",
abstract = "A wide-angle low-loss Y-branch waveguide with butterfly-shaped microprisms is designed. The microprisms not only compensate the phase difference but enhance the m ode-conv ersion evolution in the branching region. Simulation results predict that a mode separation with low branching losses can be achieved in the wide-angle Y-branch. The transmitted power efficiency can be as high as 89 % for the branching angle up to 20°.",
author = "Lee, {Ching Ting} and Wu, {Mount Learn}",
note = "Funding Information: To achieve compact optoelectronic devices with low excessive losses, various widebranchingangle andlow-lossY-brancheshave been proposedw3] 10x.The phase-frontacceleratortypew3] 5xisapromisingoneforpracticalapplication.It replaces the original refractive indexes in the area near the branching region by a lower index to accelerate the phase front. Since the phase front becomes curved, the optical power is redistributed, and the mode size is broadened when it passes through such regions. By properly selecting the refractive index of the phase-front accelerator, most of the optical powe r can be coupled into the output bent waveguides. Recently, a pair of integrated microprisms in the tapered section of the Y-junction branch was used to compensate the phase difference w10x. However, because of the higher refractive index of microprisms required for the large bending angle, the fundamental mode in the input straight waveguide is converted into the higher order mode when it propagates through the tapered section. In this work, we use a microprism-type phase-front accelerator with lower refractive index to suppress the undesired mode conversion. The refractive indexes of this novel combination of microprisms, referred to as the butterfly-shaped microprisms shown Received 14 October 1997; accepted 14 November 1997. This work was supported by the National Science Council under Grant NSC87-2215-E008-011. Addre ss correspondence to Prof. Ching-Ting Lee, Institute tional Central University, Chung-Li, Taiwan, Republic of China.",
year = "1998",
month = jul,
doi = "10.1080/014680398244948",
language = "English",
volume = "17",
pages = "213--219",
journal = "Fiber and Integrated Optics",
issn = "0146-8030",
publisher = "Taylor and Francis Ltd.",
number = "3",
}