Highly Sensitive Temperature Sensor Based on Gain Competition Mechanism Using Graphene Coated Microfiber

Graphene-based temperature sensor is characterized by low absorption coefficient and large thermal conductivity. We report a grapheme-coated microfiber (GCM) structure based sensor, which is demodulated with a dual-wavelength erbium-doped fiber laser (DWEDFL). The “thermophoresis effect” of GCM and gain competition between the two lasing wavelengths allow us to achieve an ultrahigh temperature sen...