Computer Sciences and Information Technology
Title : | Design and Implementation of Orbital Angular Momentum (OAM) Assisted Spectrally Efficient Wavelength Division Multiplexed Communication System Using Conventional Optical Fibers |
Area of research : | Computer Sciences and Information Technology, Engineering Sciences |
Focus area : | Multiplexed Communication System |
Principal Investigator : | Dr Sumanta Gupta, Associate Professor, Indian Institute of Technology (IIT) Patna |
Timeline Start Year : | 2019 |
Contact info : | sumanta@iitp.ac.in ; ramanaiah2009@gmail.com |
Details
Executive Summary : | In this project, it is proposed to design and implement transmitter and receiver for conventional multi-mode fiber (MMF) based transmission system that uses space division multiplexing (SDM) and wavelength division multiplexing (WDM) to enhance capacity and spectral efficiency. For implementing SDM specifically orbital angular momentum (OAM) mode multiplexing will be used. The efficacy of the transmission system will be tested for various modulation formats; such as on-off keying (OOK), phase-shift keying (PSK), quadrature amplitude modulation (QAM); and data rates (10G-100G/ channel). Both non-coherent and coherent detection will be implemented for this joint WDM and OAM multiplexing strategy. The targeted transmission reach will be a few kilometers for conventional MMFs. Experimental setup will be developed to de-multiplex wavelength and OAM modes at the receiver end and data recovery will be done with and without using MIMO-DSP techniques. The expected developed system will support M×N channels over a single MMF using M wavelengths and N OAM modes. The system will be designed using free space and fiber-based optical components to generate, multiplex, and de-multiplex WDM channels and OAM modes. For OAM mode generation and detection, special phase patterns using spatial light modulator (SLM) will be used. Data transmission having different rates (10-100G) and modulation formats (OOK, PSK, QAM) will be performed over a few kilometers of commercially available MMF such as OM2/OM3/OM4. Investigators shall also test OM1 fiber but it is expected that the performance of the system will be very poor. OAM mode exciter/filter/coupler will be used to launch/take out a selective number of modes to/from the MMF. The performance of the transmission system will be estimated in terms of pre-FEC bit error rate (BER), error vector magnitude (EVM), Power penalty, optical signal-to-noise ratio (OSNR) penalty etc. A coherent detection scheme and digital signal processing (DSP) will be used to recover the data for PSK and QAM signals. They believe that the proposed transmitter and receiver employing WDM and OAM mode multiplexing technique will enhance the capacity and spectral efficiency of the fiber optic transmission system, which utilizes conventional MMFs. These high capacity yet short-reach fiber optic links are essential for data centers and enterprises, which generates and transfer huge amount of data within their premises. Moreover, as the system will be developed for standard MMFs, which is a standard communication channel for short-haul networks, future deployment of such systems in the real world will be attractive both technically and economically. So far OAM mode multiplexing using a single wavelength is used for MMF-based transmission. It is predicted that the use of WDM technology along with OAM multiplexing will drastically increase the capacity and spectral efficiency of the short-haul fiber optic communication system. |
Co-PI: | Dr Venkata Ramanaiah Dantham, Associate Professor, Indian Institute of Technology (IIT) Patna |
Total Budget (INR): | 76,43,262 |
Achievements : | 1. Successful generation of OAM modes over C band using spatial light modulator (SLM).
2. Successful detection/demultiplexing of OAM modes using spiral phase plate and inverse fork hologram realized over SLM
3. Detection of order and helicity of OAM beam using interferogram
4. Successful multiplexing of two OAM beams having different orders using free-space optics |
Organizations involved
