Optical Power Detector Based On Side Polished Fiber And MoS₂ Or As₂Se₃ Films

The all-optical network, in a basis of the wavelength routed optical switching technology and wave division multiplexing transmission technology, implemented the high-speed information transmission and exchange in the optical domain, optical signals are always used the data signal from the source node to the destination node in the transmission process, in each node without optical/electrical or electrical/optical conversion. In the signal transmission process of the signal on the download and signal leakage and other inspection work need to use light detector. The optical detector is the total of devices, that uses the interaction of light and matter, the light energy is converted into other perceived amount.However, if in all optical conditions, the limitations of all kinds of photoelectric detectors have been appeared, all optical detectors will be a new hot research direction. All optical detector is a kind of response to the external illumination, but the output signal is the light signal in the optical waveguide. All optical detector will be an important part of all optical network in the future.The side polished fiber is a new type of light guide carrier which is produced on the basis of common communication fiber. It is the use of optical micro processing technology, the general communication fiber polishing off a part of the package layer made of fiber. When the package layer thickness polishing decreases to a certain region, due to the existence of the evanescent field, equivalent to form a core of the optical field of the "window" in the region, people can use the light "window" of the evanescent field detection, excitation, control the propagation of light in the fiber core. Molybdenum disulfide(Mo S2) is emerged in recent years, with excellent properties of a layered nano materials, both double characteristics of typical transition metal compounds content material(TMDs) and two-dimensional material. Unlike graphene, Mo S2 have direct band gap. The new functional characteristics make it become a new optoelectronic platform, including broadband ultrafast photoelectric detection, electro optic modulation, saturation absorption, nonlinear parameters. Transition metal compound material(TMDs) are semiconductor materials. arsenic selenide(As2Se3), as typical chalcogenide compounds, the light transmission rate is very high in the near infrared light,it also has high refractive index and large nonlinear. What’s more, It has light with light induced characteristics, such as light induced darkening effect. The use of Mo S2 or As2Se3 and side polished optical fiber detector combination has not been reported.This paper studies a kind of optical power detector based on Mo S2 or As2Se3 coating films and side polished fiber. First, this paper found that the side polished fiber coated with Mo S2 or As2Se3 material have the polarization characteristics. Secondly, the side polished fiber,as optical waveguide, and the signal light is transmitted in it. Mo S2 or As2Se3,as photosensitive material, response to the external light stimulus and then impact the signal light. When the external light irradiate the Mo S2 or As2Se3 cladding layer region of optical power detector, The polarization characteristics of the transmission light in the optical waveguide are changed with the variation of the optical power of the external beam, consequently achieve optical conversion response.The innovations of this paper lies in:1. It is discovered that side polished fiber deposited with Mo S2 films has polarization characteristics at 1550 nm and side polished fiber deposited with As2Se3 films has polarization characteristics in a wide wavelength range from 1458 nm to1620nm;2. The all-optical optical power detector based on side polished fiber and MoS2 or As2Se3 has been realization. By using the photosensitive properties of Mo S2 or As2Se3 to realize the optical to optical conversion. A new parameter is defined: the efficiency of optical and optical conversion. We define the optical conversion efficiency as the ratio of the relative response of the optical fiber waveguide to the detected light power density. The formula is: the light conversion efficiency = relative response(I, LPER)/detection power density(P).3. The polarization characteristics of the transmitted signal light in the device are related to the power of the illumination of the typical visible wavelength. By using the linear relation, the device can be used to form the optical power detector with the optical fiber analyzer.