• Sreepadha Sairishi
• Y Praveen Kumar Reddy

We demonstrate a high-speed optical transmission link utilizing signal processing techniques with a tri-mode 16-QAM vertical cavity surface emitting laser (VCSEL) operating at 850 nm over OM5 multi-mode fiber. At the transmitter, a linearly polarized raised cosine (LPRC) roll-off filter is employed to enhance frequency response at GHz ranges. A discrete multi-tone (DMT) modulation scheme with pre-equalization, combined with a cosine pulse filter (CPF), is implemented to support data rates exceeding 135 Gb/s with improved signal quality. Additionally, an orthogonal frequency division multiplexing (OFDM) scheme using fast Fourier transform (FFT) coefficients facilitates high-speed digital transmission. A 2⁷–1 pseudo-random bit sequence (PRBS) is used for testing the system. Performance analysis based on eye and constellation diagrams reveals low bit error rates and minimal signal distortion. Our system achieves a peak data rate of 200 Gb/s with enhanced optical modulation amplitude, high link efficiency, and low power consumption. The proposed approach outperforms existing methods in both performance and energy efficiency.

Quadrature amplitude modulation; Multi-mode Fiber; Discrete Multi-tone; Orthogonal Frequency Division Multiplexing; Fast Fourier Transform; Optical modulation amplitude.

"Design and Simulation of High-speed Multimode Optical Link", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 12, page no.g19-g27, December 2021, Available :http://www.jetir.org/papers/JETIR2112602.pdf

"Design and Simulation of High-speed Multimode Optical Link", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 12, page no. ppg19-g27, December 2021, Available at : http://www.jetir.org/papers/JETIR2112602.pdf