Abstract
This Letter reports a collinear optical interconnect architecture for acoustic sensing via a monolithic integrated GaN optoelectronic chip. The chip is designed with a ring-shaped photodiode (PD) surrounding a light-emitting diode (LED) of a spectral range from 420–530 nm. The axisymmetric structure helps the coaxial propagation of light transmission and reception. By placing this multiple-quantum wells (MQW)-based device and a piece of aluminum-coated polyethylene terephthalate (Al/PET) film on fiber ends, an ultra-compact acoustic sensing system is built. The sound vibrations can be simply detected by direct measurement of the diaphragm deformation-induced power change. An average signal noise ratio (SNR) of 40 dB and a maximum sensitivity of 82 mV/Pa are obtained when the acoustic vibration frequency changes from 400 Hz to 3.2 kHz. This work provides a feasible solution to miniaturize the sensing system footprint and reduce the cost.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Ziqi Ye, Hao Zhang, Fan Shi, Jianwei Fu, Binju Wang, Xumin Gao, and Yongjin Wang
Opt. Lett. 48(21) 5659-5662 (2023)
Xumin Gao, Tai Li, Dongmei Wu, Fujun Zhu, Mingyuan Xie, Yongjin Wang, and Zheng Shi
Opt. Lett. 48(20) 5367-5370 (2023)
Xiaoshuai An, Liang Chen, Jing Li, and Kwai Hei Li
Opt. Lett. 46(2) 170-173 (2021)