Tunable slow light and buffer capability in photonic crystal coupled-cavity waveguides based on electro-optic effect

An enhanced photonic crystal coupled-cavity waveguide (PC-CCW) is proposed to realize compact, ultra-fast modulated and high-performance buffering application. The slow light and buffer performances of PC-CCW are optimized by adjusting the cavity spacing and the hole size around the cavity. In the o...

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Bibliographic Details
Published in:Optics communications 2012-05, Vol.285 (10-11), p.2760-2764
Main Authors: Tian, Huiping, Long, Fang, Liu, Weijia, Ji, Yuefeng
Format: Article
Language:English
Subjects:
Buffer capability
Buffers
Coupled-cavity waveguide
Delay
Dynamic modulation
Electric potential
Holes
Modulation
Photonic crystal
Q factors
Slow light
Voltage
Waveguides
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Summary:An enhanced photonic crystal coupled-cavity waveguide (PC-CCW) is proposed to realize compact, ultra-fast modulated and high-performance buffering application. The slow light and buffer performances of PC-CCW are optimized by adjusting the cavity spacing and the hole size around the cavity. In the optimized structure, the group velocity is below 2.713×10−4c. The corresponding delay time, buffer capacity and Q factor can reach as high as 12.286ns, 68.5bit and 3525, respectively. Then the dynamic modulation of slow light transmission and buffer capacity in PC-CCW are systemically studied. The simulation shows that the buffer capacity and the physical size of each bit are unchanged as the applied voltage increases. While the wavelength shift and delay time decrease almost linearly as the applied voltage increases. And the modulation sensitivities are about 3.726nm/mV and 0.875ns/mV, respectively. The Q factor also decreases accordingly.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2012.01.086