title: High-order photonic differentiator employing on-chip cascaded microring resonators.
abstract: We propose and experimentally demonstrate a high-order photonic differentiator using on-chip complementary metal oxide semiconductor-compatible cascaded microring resonators, including first-, second-, and third-order differentiators. All the microring resonator units have a radius of 150 μm and a free spectral range of 80 GHz. The microring resonator can implement the first-order derivative of the optical field near its critical coupling region. Hence higher-order differentiation can be obtained by cascading more microring units on a single chip. For the periodical Gaussian optical pulse injection, the average deviations of all differentiators are less than 6.2%. The differentiation of pseudo-random bit sequence signals at 5 Gbit/s is also demonstrated. Our scheme is a compact and low-power-consumption solution since the cascaded microring units are fabricated with compact size on the silicon-on-insulator substrate.
authors: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
authors: Jianji
authors: J
authors: Dong
authors: Aoling
authors: A
authors: Zheng
authors: Dingshan
authors: D
authors: Gao
authors: Shasha
authors: S
authors: Liao
authors: Lei
authors: L
authors: Lei
authors: Dexiu
authors: D
authors: Huang
authors: Xinliang
authors: X
authors: Zhang