Evaluation of chromatic dispersion in erbium-doped fibers

Gasper, D.; Wysocki, Paul F.; Reed, W. A.; Vengsarkar, Ashish M.

doi:10.1109/leos.1993.379087

Cited by 1 publication

(1 citation statement)

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“…More recently, the silicabased EDF has been utilized to realize optical amplification over S-band (1480-1520 nm) and/or C+L band (1530-1620 nm) [12][13][14] as a consequence of the influence of Stark splitting on 4 I 13/2 and 4 I 15/2 multiplets and the introduction of fundamental-mode cutoff in EDF [12,13]. The Stark splitting makes laser transitions of trivalent erbium ions in silica host glass between 4 I 13/2 → 4 I 15/2 multiplets at room temperature can provide optical gain from 1450-1650 nm when the erbium ions are thoroughly inverted [15][16][17]. A fundamental-mode cutoff mechanism based on waveguide or material dispersion [13,16,18] must be employed along EDF to filter out the C+L band amplified spontaneous emission (ASE) so that the optical gain for S-band can be acquired.…”

Section: Introductionmentioning

confidence: 99%

Towards the short-wavelength limit lasing at 1450 nm over 4I13/2 ? 4I15/2 transition in silica-based erbium-doped fiber

Chen¹,

Hung²,

Chi³

et al. 2007

Opt. Express

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The transition rate of the stimulated emission at the higher energy levels of the excited states in a silica-based erbium-doped fiber can be enhanced by introducing fundamental-mode cutoff filtering mechanism. The electrons excited by optical pumping can more occupy the higher energy levels of the excited states when the transition rate for the lower energy levels (longer wavelengths) of the excited states is substantially suppressed. The achieved lasing wavelength can thus be moving toward the shorter wavelengths of the gain bandwidth. The laser transition between 4I13/2 ? 4I15/2 multiplets of the silica-based erbium-doped fiber is known to emit fluorescence with the shortest wavelength around 1450 nm. We, for the first time, experimentally demonstrate a widely tunable fiber laser at the wavelength very close to 1450 nm by using a standard silica-based C-band erbium-doped fiber. The tuning range covers 1451.9-1548.1 nm, with the best temperature tuning efficiency as high as 57.3 nm/ degrees C, by discretely introducing tunable fundamental-mode cutoff tapered fiber filters along a 16-m-long erbium-doped fiber under a 980 nm pump power around 200 mW. The signal-ASE-ratio can be higher than 45 dB whereas the FWHM of the laser lasing lights can be reduced below 0.2 nm by using an additional Fabry-Perot filter.

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