Dey, Jishnu and Ghosh, Aruna and Pal, Atasi and Chowdhury, Sourav Das (2026) High Repetition Rate Uniform 120 nm C+L Band Erbium Fiber Laser. In: International Symposium on Recent Trends in fiber Optics, Photonics, Materials & Devices, 18-20 June 2026, IIEST Shibpur, West Bengal. (Submitted)

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Abstract

An 80 MHz broadband Erbium-doped fiber laser with > 100 nm C+L band coverage is realized, using cascaded standard single-mode fibers in a robust and practical design. Broadband light sources spanning across the C+L bands around 1560 nm are highly desirable due to their direct compatibility with the low-loss transmission window of standard silica fibers, enabling applications in high-capacity optical communications, spectroscopy, and frequency metrology [1]. Developing such sources using an all-fiber, high repetition rate platform based solely on commercially available single-mode fibers offers low cost, ease of integration, and long-term operational stability. Conventional broadband sources or supercontinuum generation [2] relies on high peak power as it enters the nonlinear fiber(s) segment for undergoing nonlinear broadening due to SPM (self-phase modulation), XPM (cross-phase modulation) and other nonlinear effects [3]. However, obtaining a smooth and flat broadband spectrum at high repetition rates remains challenging, since higher repetition rates correspond to lower pulse energies and hence weaker nonlinear interactions. In such systems, use of spectral filtering like a Lyot filter plays a crucial role not only in shaping spectrum, by suppressing spectral ripples, sideband structures, thereby improving spectral smoothness while assisting controlled nonlinear broadening in conventional single-mode fibers. The seed laser for the broadband generation is a mode-locked source based on NPR with a repetition rate of 80.11MHz, followed by a Lyot filter arrangement. After the EDFA (Erbium Doped Fiber Amplifier) it is followed by 2 m standard single mode fiber (SMF28) followed by 3.5 m of highly nonlinear fiber (UHNA3) and finally terminated with 0.5 m of another single mode fiber (HI1060) patch cord. The cascaded configuration allows efficient redistribution of optical power across wavelengths, resulting in a continuous and smooth broadband output around 120 nm. The system delivers an average output power of 48.6mW while maintaining a broad and uniform spectral profile across the C and L bands. In conclusion, this work demonstrates broadband output using conventional single-mode fibers entirely, providing a practical solution for various applications. The incorporation of Lyot-filter further assists spectral broadening by suppressing sidebands, leading to a smoother output spectrum. Future work will focus on deeper understanding of the interplay between dispersion, nonlinear effects, and spectral filtering within the cascaded fiber system.

Item Type:	Conference or Workshop Item (Speech)
Subjects:	Engineering Materials
Divisions:	Fiber Optics and Photonics
Depositing User:	Ms Upasana Sahu
Date Deposited:	23 Sep 2026 09:06
Last Modified:	23 Sep 2026 09:06
URI:	https://cgcri.csircentral.net/id/eprint/5823

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