Analytical model for signal and gain modulation on thulium-doped fiber amplifiers in S and near-C bands including amplified spontaneous emission: signal power analysis

Mohd Mansoor Khan; Ramesh K. Sonkar

doi:10.1117/1.OE.58.2.026103

5 February 2019 Analytical model for signal and gain modulation on thulium-doped fiber amplifiers in S and near-C bands including amplified spontaneous emission: signal power analysis

Mohd Mansoor Khan, Ramesh K. Sonkar

Author Affiliations +

Optical Engineering, Vol. 58, Issue 2, 026103 (February 2019). https://doi.org/10.1117/1.OE.58.2.026103

Abstract

Multiple transition levels covering S and near-C bands (1460 to 1565 nm) of thulium-doped fiber amplifiers (TDFAs) allows them as potential alternative to erbium-doped fiber amplifiers (EDFAs) hence getting employed in dense wavelength division multiplexing (DWDM) in optical fiber communication. We present overmodulation gain dynamics (OGD) on TDFAs using the EDFA’s Bononi and Rusch (1998) model. The paper portrays overmodulation of digital optical communication signal, of which amplitude was modulated by low-frequency (∼100 kHz), for line-surveillance and management control of optical information in DWDM TDFA systems. Signal-to-signal and signal-to-amplified spontaneous emission (ASE) transfer functions were derived to predict the system’s performance under high input signal power conditions and its variation on input modulation indices. Difference of −10.3 dB (0.093 W) in output signal gain was observed at 1490 nm signal wavelength with ASE. Output modulation index of 15% having high pass signal characteristics as of a lead compensator was observed with the applied signal frequency sweep. Overmodulation sensitivity for various levels of input signal power demonstrates undesirable 30% increment in the output modulation index at 8 dBm and 1490 nm signal wavelength, respectively, at corner frequency.

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Mohd Mansoor Khan and Ramesh K. Sonkar "Analytical model for signal and gain modulation on thulium-doped fiber amplifiers in S and near-C bands including amplified spontaneous emission: signal power analysis," Optical Engineering 58(2), 026103 (5 February 2019). https://doi.org/10.1117/1.OE.58.2.026103

Received: 1 November 2018; Accepted: 8 January 2019; Published: 5 February 2019

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