Abstract

Optoelectronic chromatic dispersion (OED) has recently been shown to be a significant source of chromatic dispersion in photodiodes. We characterize the OED in a commercial germanium PN-type photodiode and determine the optimum conditions for maximum OED sensitivity and wavelength monitoring. A peak OED sensitivity of 1 deg/nm is measured in a spectral range of 1550–1558 nm with 4 MHz modulation. We also demonstrate an application of OED in fiber Bragg grating (FBG) interrogation. Quasi-static and vibration strains are monitored, with a spectral and strain sensitivity of ${1}{.25}\;{\rm pm/}\sqrt {\rm {Hz}}$ and ${1}{.08\,\,\unicode{x00B5}\varepsilon /}\sqrt {\rm {Hz}}$, respectively. Photodiode OED can form the basis of inexpensive chip-scale grating-less spectral analysis.

© 2021 Optical Society of America

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