What is it about?
A super luminescent diode (SLD) is excellent as a compact and cost effective broadband light source. However, the highest operation wavelength of commercially available SLDs is limited to 1.65 µm (there is no 1.8 µm band SLD), and ripples in the spectrum, which introduce noise into a measurement, increase as the output power from the SLD increases. So, we realize a 1.8 µm broadband light source using a commercially available 1.65 µm band SLD. To achieve a high power broadband and low ripple spectrum, we employed a cascade configuration consisting of the SLD and a thulium-doped fibre amplification unit.
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Why is it important?
The achieved bandwidth where the intensity exceeded -20 dBm/nm was 247 nm (from 1611 to 1858 nm) with a low ripple whose peak-to-peak value was less than 0.15 dB.
Perspectives
Our light source operating in the 1800 nm wavelength region is attractive as a broadband light source for scientific experiments such as those involving near-infrared spectroscopy, and for future optical transmission systems and their component development, beyond 1.6 µm.
Professor Makoto YAMADA
Osaka Metropolitan University
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This page is a summary of: 1.8 μm broadband light source using super luminescent diode, Electronics Letters, September 2014, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/el.2014.2724.
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