System and method for transmitting signals in a free space optics communication system
A free space optics system includes a transmitter for generating an orbital angular mode (OAM) laser signal and a receiver. The OAM laser signal may be a Multiplexed Laguerre Gaussian (Mux-LG) OAM laser signal. The receiver includes a beam splitter for receiving the OAM laser signal and a charge coupled device (CCD) camera for receiving the OAM laser signal from the beam splitter and imaging the OAM laser signal. The receiver further includes a computing device in communication with the CCD camera. The computing device is configured to determine a power of the OAM laser signal from images taken by the CCD camera to detect interception of the OAM laser signal. The computing device may detect the interception using a deep learning model or a convolutional neural network (CNN).
1 . A free space optics system, comprising:
a transmitter for generating an orbital angular mode (OAM) laser signal; and
a receiver comprising:
a beam splitter for receiving the OAM laser signal;
a charge coupled device (CCD) camera for receiving the OAM laser signal from the beam splitter and imaging the OAM laser signal; and
a computing device in communication with the CCD camera, wherein the computing device is configured to determine a power of the OAM laser signal from images taken by the CCD camera to detect interception of the OAM laser signal.
2 . The free space optics system as recited in claim 1 , wherein the transmitter comprises:
a laser for generating a laser signal; and
a spatial light modulator (SLM) for receiving the laser signal and generating the OAM laser signal.
3 . The free space optics system as recited in claim 1 , wherein the OAM laser signal is a Multiplexed Laguerre Gaussian (Mux-LG) OAM laser signal.
4 . The free space optics system as recited in claim 1 , wherein the CCD camera is a low-noise CCD camera having a filter.
5 . The free space optic system as recited in claim 1 , further comprising a polarizer located between the beam splitter and the CCD camera.
6 . The free space optics system as recited in claim 1 , wherein the computing device is configured to detect the interception using a deep learning model.
7 . The free space optics system as recited in claim 1 , wherein the computing device is configured to detect the interception using a convolutional neural network (CNN).
8 . A free space optics method for detecting interception of a signal, the method comprising:
generating an orbital angular mode (OAM) laser signal using a transmitter;
receiving the OAM laser signal at a beam splitter;
directing the OAM laser signal from the beam splitter to a charge coupled device (CCD) camera;
imaging the OAM laser signal with the CCD camera;
transmitting images of the OAM laser signal from the CCD camera to a computing device; and
determining, using the computing device, a power of the OAM laser signal from images taken by the CCD camera to detect interception of the OAM laser signal.
9 . The free space optics method as recited in claim 8 , wherein the OAM laser signal is generated by a laser directing a laser signal to a spatial light modulator (SLM).
10 . The free space optics method as recited in claim 8 , wherein the OAM laser signal is a Multiplexed Laguerre Gaussian (Mux-LG) OAM laser signal.
11 . The free space optics method as recited in claim 8 , wherein the CCD camera is a low-noise CCD camera having a filter.
12 . The free space optic method as recited in claim 8 , wherein a polarizer is located between the beam splitter and the CCD camera.
13 . The free space optics method as recited in claim 8 , wherein the detection of the interception is performed using a deep learning model.
14 . The free space optics method as recited in claim 8 , wherein the detection of the interception is performed using a convolutional neural network (CNN).