Multilayer graphene improved interface thermal property for all-optical controlled fiber interferometer

Abstract

As the oxide-induced disruption from silicon dioxide substrate would greatly decrease the thermal property of graphene, strategies to optimize the thermo-optical response through controlling laser spot size, layer number and covering length of graphene layer are experimentally studied and discussed. An all-optical controlled fiber Mach-Zehnder interferometer with multilayer and monolayer graphene achieved by thermo-optical effects is subsequently proposed to prove the improvements. Graphene layers with 6 mm length were transferred to the middle taper and heated by an external laser. The maximum switching extinction ratio reached 16.2 dB. The response time and modulation efficiency were approximately 620 µs and 0.22 dB mW −1 , respectively. This work suggests an effective way to improve the thermal property of graphene-fiber hybrid structure for all-optical control in fiber based integrated system. Moreover, the cost and complexity of device manufacturing are greatly reduced.

Few-Layer Graphene Integrated Tilted Fiber Grating For All-Optical Switching

“…4. Compared with other schemes, including graphene/WS 2 /gold nanorods-coated microfibers [10][11][12], sidepolished twin-core fiber [13] or etched-FBG [15], and graphene-coated MZIs by external pumping [17,29], the response rate of this device is enhanced by ~3 orders of magnitude. It could be attributed to the resonant-pump at a dip wavelength of the TFBG's cladding mode and the employment of the thin fiber, which will significantly enhance the accessible evanescent field and the pump efficiency.…”