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Two bit all-optical analog-to-digital converter based on nonlinear Kerr effect in 2D photonic crystals |
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| Authors: | Bahar Youssefi Mohammad Kazem Moravvej-Farshi Nosrat Granpayeh |
| Institution: | 1. Advanced Devices Simulation Lab (ADSL), Faculty of Electrical and Computer Engineering, Tarbiat Modares University (TMU), P.O. Box 14115-194, Tehran 1411713116, Iran;2. Faculty of Electrical and Computer Engineering, K.N. Toosi University of Technology, P.O. Box 16315-1355,Tehran 1431714191, Iran;1. School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China;2. School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China;6. Department of Electrical & Computer Engineering University of Connecticut Storrs, CT., USA |
| Abstract: | We have demonstrated the performance of a novel design for a single wavelength 2-bit all-optical analog-to-digital converter (ADC). This converter consists of two high efficient channel drop filters with a coupled cavity-based wavelength selective reflector in a 2D photonic crystal with total length of 15.87 μm. The A/D conversion is achieved by using nonlinear Kerr effect in the cavities. The output ports switch to state ‘1’ at different input power levels to generate unique states preferred for an ADC. This conversion is simulated by the finite difference time domain (FDTD) method for 5 different power levels. The proposed structure can function as a two-bit ADC with a 60 mW/μm input pulse and its maximum sampling rate is found to be ~ 45 GS/s. |
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