Experimental Demonstration of Optical PAM-4 Generation for Short-Reach Optical Communications

Naveenkumar, M and Vaddadi, VSCS and Shivaleela, ES (2022) Experimental Demonstration of Optical PAM-4 Generation for Short-Reach Optical Communications. In: 2022 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2022, 12 - 16 December 2022, Bangalore, pp. 547-551.

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Abstract

The demand for higher bandwidth is increasing exponentially due to high-speed applications and increase in the number of users accessing internet. To meet this demand several modulation techniques are proposed which have higher spectral efficiency exploiting different dimensions of the optical carrier amplitude, phase, and polarisation. Further, by combining wavelength division multiplexing scheme with the dimensions of the optical carrier, capacity of the network can be further enhanced. Optical telecommunication networks can be broadly classified as long and short-haul, where m-Quadrature amplitude modulation (m-QAM) schemes are popular in former, and 4-level pulse amplitude modulation (PAM-4) is a promising economical solution for latter. In this paper, a proof-of-concept technique of generating optical PAM-4 signal is proposed. Experimental demonstration and simulation of PAM signal generation and transmission is done at bit rate 240 Mbps and baud rate 120 Mbps over various fiber lengths. Generation of signal optically circumvents the need for high speed electronics transmitter and also it is possible to exploit the complete dynamic range of the optical source characteristics, which otherwise would be limited to linear region. This concept can be extended to Integrated optics for very high signal rate generation optically. © 2022 IEEE.

Item Type:	Conference Paper
Publication:	2022 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2022
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Microwave photonics; Optical communication; Spectrum efficiency, Experimental demonstrations; High bandwidth; Higher speed applications; Microwave Photonics; Modulation techniques; Optical carriers; Optical generation; Optical generation of PAM-4; Optical-; Short-reach communication, Pulse amplitude modulation
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	27 Mar 2023 11:23
Last Modified:	27 Mar 2023 11:23
URI:	https://eprints.iisc.ac.in/id/eprint/81205

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