A review–unguided optical communications: Developments, technology evolution, and challenges

AAB Raj, P Krishnan, U Darusalam, G Kaddoum… - Electronics, 2023 - mdpi.com
This review paper discusses the complete evolution of free-space optical (FSO)
communication, also known as unguided optical communication (UOC) technologies, all the …

Ultrawideband systems and networks: Beyond C+ L-band

T Hoshida, V Curri, L Galdino, DT Neilson… - Proceedings of the …, 2022 - ieeexplore.ieee.org
In the evolution of optical networks, spectral efficiency (SE) enhancement has been the most
cost-efficient and thus the main driver for capacity increase for decades. As a result, the …

1.58-\mum Band Gain-Flattened Erbium-Doped Fiber Amplifiers for WDM Transmission Systems

H Ono, M Yamada, T Kanamori, S Sudo… - Journal of lightwave …, 1999 - opg.optica.org
This paper describes the amplification characteristics of gain-flattened Er3+-doped fiber
amplifiers (EDFA's) by using 0.98-μ m and 1.48-μ m band pumping for a 1.58-μ m band …

Double-pass L-band EDFA with enhanced noise figure characteristics

SW Harun, N Tamchek, P Poopalan… - IEEE Photonics …, 2003 - ieeexplore.ieee.org
A new double-pass long wavelength band erbium-doped fiber amplifier with enhanced
noise figure characteristics is demonstrated by adding a short length of forward pumped …

Long-wavelength erbium-doped fiber amplifier gain enhanced by ASE end-reflectors

J Nilsson, SY Yun, ST Hwang, JM Kim… - IEEE Photonics …, 1998 - ieeexplore.ieee.org
We use for what we believe is the first time narrow-band end-reflectors to reduce losses
through short-wavelength amplified stimulated emission (ASE) in silica-based erbium-doped …

New pump wavelength of 1540-nm band for long-wavelength-band erbium-doped fiber amplifier (L-band EDFA)

BH Choi, HH Park, MJ Chu - IEEE Journal of Quantum …, 2003 - ieeexplore.ieee.org
A long-wavelength-band erbium-doped fiber amplifier (L-band EDFA) using a pump
wavelength source of 1540-nm band has been extensively investigated from a small single …

S-band erbium-doped fiber amplifiers with a multistage configuration-design, characterization, and gain tilt compensation

H Ono, M Yamada, M Shimizu - Journal of Lightwave technology, 2003 - opg.optica.org
We report an S-band erbium-doped fiber amplifier (EDFA) with a multistage configuration in
terms of its design, gain, and noise characteristics for various pump powers and input signal …

Search for evidence of compositeness at LEP I

ALEPH collaboration, R Barate - … Physical Journal C-Particles and Fields, 1998 - Springer
Extensive searches for evidence of compositeness of quarks and leptons have been made
in the complete set of ALEPH data from LEP running at the Z peak. These include searches …

High-gain coefficient long-wavelength-band erbium-doped fiber amplifier using 1530-nm band pump

BH Choi, HH Park, M Chu… - IEEE Photonics …, 2001 - ieeexplore.ieee.org
A 1530-nm band has been studied as a pump wavelength for the long-wavelength-band
erbium-doped fiber amplifier (L-band EDFA). The pump source is built using a tunable light …

Comparison of performances between partial double‐pass and full double‐pass systems in two‐stage L‐band EDFA

N Md Samsuri, SW Harun, H Ahmad - Laser Physics Letters, 2004 - Wiley Online Library
The two‐stage L‐band EDFA with partial double‐pass (DP) system is compared with the full
DP system. The partial DP system has a higher gain and lower noise figure at small input …