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All-optical tunable microfiber knot resonator with graphene-assisted sandwich structure
Optics Express
|August 10, 2017
Summary
We developed an all-optical tunable microfiber knot resonator using graphene. This device offers significant improvements in amplitude tuning and wavelength control for optical modulation and filtering applications.
Area of Science:
- Optoelectronics
- Materials Science
Background:
- Microfiber knot resonators (MFKRs) are key components in photonics.
- Graphene's unique optical properties offer potential for device modulation.
Purpose of the Study:
- To demonstrate an all-optical tunable MFKR using direct light-graphene interaction.
- To investigate performance modulation via graphene's optical effects.
Main Methods:
- Utilized a 1530 nm continuous wave (CW) pump laser incident vertically on a graphene-coated MFKR.
- Exploited saturable absorption, photo-thermal, and optical Kerr effects for tuning.
Main Results:
- Achieved remarkable amplitude tuning with transmission loss and extinction ratio increases of 69x and 125x, respectively.
- Observed a red-shift in resonant wavelength exceeding one free spectral range (FSR), enabling full-range tuning.
Conclusions:
- The graphene-integrated MFKR provides enhanced all-optical tunability.
- The device shows promise for applications in all-optical modulators and tunable optical filters.
