Abstract

Taking advantage of the high thermal conductivity of graphene, this Letter demonstrates a microelectromechanical (MEM) tunable Fabry–Pérot (F–P) cavity, based on a graphene-bonded fiber device (GFD), which acts as a microheater. By increasing the electric current from 0 to 8 mA in the heater, the temperature of the GFD can rise and approach a value of 760 K theoretically. This high temperature will cause a deformation of the fiber, allowing the graphene-bonded fiber end to form a gap-adjustable F–P cavity with a cleaved single-mode fiber. The gap in the cavity can be reduced by increasing the current applied, leading the transmittance of the cavity to change. In this work, a highly sensitive current sensor ($5.9\times {10}^5\mathrm{nm}/{\mathrm{A}}^2$) and a tunable mode-locked fiber laser ($1.2\times {10}^4\mathrm{nm}/{\mathrm{A}}^2$) are created based on the MEM tunable F–P cavity.

© 2019 Optical Society of America

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