Design of flat-field arrayed waveguide grating with three stigmatic points |
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| Authors: | Lu S Wong WH Pun EYB Yan Y Wang D Yi D Jin G |
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| Institution: | (1) Department of Electronic Engineering, Optoelectronics Research Center, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong;(2) Department of Precision Instruments, State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing, 100084, P.R. China |
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| Abstract: | A new-type flat-field arrayed waveguide grating (AWG), with the focal signals of all wavelengths of operation focusing along a straight line, has been designed. The work bases on the aberration theory of AWG, in which the restraints imposed on the conventional Rowland-type AWG have been released. In the design of flat-field AWG, three stigmatic points restrain three dominant geometry parameters: geometry of star couplers, ports distribution of phased-array, and length increment between adjacent paths. An eight-channel 200-GHz spacing flat-field AWG has been designed and simulated. As stigmatic points introduced, the aberration of this device is much lower than that of the Rowland-type AWG. |
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| Keywords: | aberration theory arrayed waveguide grating (AWG) flat-field stigmatic point |
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