Abstract
A new tunable fiber ring laser structure employing an Opto-VLSI processor and an erbium-doped fiber amplifier (EDFA) is reported. The Opto-VLSI processor is able to dynamically select and couple a waveband from the gain spectrum of the EDFA into a fiber ring, leading to a narrow-linewidth high-quality tunable laser output. Experimental results demonstrate a tunable fiber laser of linewidth 0.05 nm and centre wavelength tuned over the C-band with a 0.05 nm step. The measured side mode suppression ratio (SMSR) is greater than 35 dB and the laser output power uniformity is better than 0.25 dB. The laser output is very stable at room temperature.
Highlights
The development of tunable laser sources featuring single longitudinal hopping-free mode and narrow linewidth around 1.55-μm has attracted considerable interest in applications such as optical communications, optical sensing, optical signal processing, spectroscopy and instrumentation
Experimental results demonstrate a tunable fiber laser of linewidth 0.05 nm and centre wavelength tuned over the C-band with a 0.05nm step
Experimental results have shown that the tunable fiber laser has an side mode suppression ratio (SMSR) larger than 35 dB, an output power uniformity of 0.25 dB over the entire C-band, a linewidth as narrow as 0.05 nm, a wavelength tuning resolution as small as 0.05 nm, and excellent stability at room temperature
Summary
The development of tunable laser sources featuring single longitudinal hopping-free mode and narrow linewidth around 1.55-μm has attracted considerable interest in applications such as optical communications, optical sensing, optical signal processing, spectroscopy and instrumentation. Erbium-doped fiber lasers offer several advantages, such as the broad emission spectrum and homogeneously-broadened gain characteristics, resulting in a high side-mode suppression ratio. Because of their very long cavity length, single-mode fiber ring lasers exhibit multimode oscillation, mode competition and mode hopping, making the selection and wavelength tuning inaccurate. The Opto-VLSI-based tunable fiber laser has a linewidth as small as 0.05 nm and a tuning step of about 0.05 nm. It is motionless and can be tuned electronically (via software) over the gain bandwidth of the EDFA
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