Optical wavelength identifying system

An optical wavelength identifying system, the system comprising:

• an optical wavelength detecting device configured to detect an optical wavelength of an incident light, comprising:
• a polarizer configured to transform the incident light into a polarized light;
• a detecting element configured to form a temperature difference or a potential difference between two points of the detecting element when exposed to the polarized light, wherein the detecting element comprises a carbon nanotube structure that comprises a plurality of carbon nanotubes oriented along a first direction, and angles between a polarizing direction of the polarized light and the first direction of the plurality of carbon nanotubes is adjustable;
• a measuring device electrically connected to the detecting element and configured to measure the temperature difference or the potential difference;
• a data processor electrically connected to the measuring device and configured to obtain the optical wavelength by calculating and analyzing the temperature difference or the potential difference;
• a memory configured to store a predetermined value and a standard database of transmittance-angle-wavelength values and predetermined values;
• a modulator configured to set or reset the predetermined value;
• a comparison module configured to compare the optical wavelength of the incident light with the predetermined value to obtain a comparison result;
• and
• an instruction module configured to send a work instruction according to the comparison result.