We proposed a 2×2 SOI thermo-optic switch based on microring assisted Mach-Zehnder interferometer(RAMZI) and graphene heater. The thermo-optic switch consists of 2×2 MMI-based 3-dB coupler, and RAMZI with graphene film as heater fixed above the microring resonator. A design and optimization of the switch, including optical characteristics of MMI coupler and MZI, electro-thermal characteristics of graphene heater and the overall performance of the switch, is carried out. The thermo-optic switch is demonstrated with small footprint of 0.07 mm2 , and low power consumption on simulation.
The high-frequency and tunable microwave signals are highly desirable in the files of military and civilian. The microwave photonic technology is an important solution to generate high-frequency and tunable microwave signals. Among them, the integrated microwave photonic solutions have a broader application prospect due to its small size, large bandwidth, and low power consumption, etc. We demonstrate a design of the monolithic integrated coupled DFB lasers (IC-DFB) to generate tunable microwave signal. A semiconductor optical amplifier (SOA) is integrated between DFB lasers to adjust the coupling strength. By tuning the injection current of the SOA section, microwave signals with a tuning range from 31 GHz to 35 GHz is achieve.
As a two-dimensional material, graphene shows excellent properties in many aspects. Among them, it exhibits extremely high carrier mobility, excellent thermal conductivity, and high temperature stability due to its unique lattice structure, so it is superior than previously used conventional materials in the field of thermal applications. This paper introduces the study of graphene heating film of centimeter scale. We transfer large areas of graphene films to four different substrates to study the characteristics of heating temperature, thermal response time and heating uniformity of graphene films. Experimental results show that graphene with a heating area of 0.7cm × 1cm can be rapidly raised from room temperature to above 100℃ at a DC voltage of 25V. According to the experimental results, graphene performs well in both heating temperature and heating rate compared to traditional heating materials, which provides good prospects for the use of graphene in fields such as deicing, defogging, medical physiotherapy and others.
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