All-optical light manipulation based on graphene-embedded side-polished fiber

Abstract

We present a study of all-optical light manipulation arising in a graphene-embedded side-polished fiber (SPF) with a Norland Optical Adhesives (NOA)-coated structure. With the help of the Pauli blocking effect, such an all-fiber device serves to manage the loss of transverse-electric-polarized light when the control light and the signal light are polarized along the direction parallel to the graphene surface. The insertion loss of this device can be effectively reduced with the NOA coating. An enhanced interaction between the graphene and the propagated light can be achieved via the strong evanescent field of the SPF and longer interaction length. This results in effective all-optical manipulation of light with a modulation depth of 10.4 dB (or modulation efficiency of ∼91%) and a modulation slope of ∼1.3, where the required control power is only about 14 dBm. The device has broadband operation wavelength. The insertion loss for both the signal light and the control light are only about 0.6 dB. The experimental results are well-fitting with the simulation study. Such an all-fiber device has the potential for all-optical signal processing.

Low Power Consuming Mode Switch Based on Hybrid-Core Vertical Directional Couplers with Graphene Electrode-Embedded Polymer Waveguides

“…For the simulation using the finite element method with commercial software (COMSOL), the finite element mesh is set as “Extremely fine” with the minimum element size of 0.0016 µm. We calculate the absorption losses induced by the GEHs, where the graphene film is modeled as a conductive boundary with the chemical potential of µ c = 0.3 eV and the complex surface conductivities 6.0792 × 10 −5 –8.616010 −6 i for 1550 nm [ 29 , 30 ]. By using the electromagnetic waves equations in the frequency domain as the physics field and mode analysis model, the effective refractive index of the modes can be solved directly.…”

Room Temperature‐Integrated Photodetector between 5 μm and 8 μm Wavelength

“…The development of mid-IR photonic circuits that integrate complete optical functions has witnessed a burst of research activity in the recent years. Different solutions have been explored for the development of an integrated mid-IR sensing platform, based on chalcogenide glasses, [4][5][6] quantum cascade lasers (QCL), [7,8] or silicon (Si) photonics. [9][10][11][12] Among them, mid-IR Si photonics present the advantage of leveraging on the high-volume fabrication technologies already developed for microelectronic integrated circuits to provide reliable and cost-efficient solutions.…”