In a joint research conducted by teams from Saudi Arabia and the United States, it was shown how laser diodes in near ultraviolet as well as RGB phosphors could be used to power up ongoing research in visible light communications.
NUV Implementation Could be Advantageous
One of the primary benefits of using near ultraviolet laser diodes is the significantly reduced noise they receive from solar radiation. A lot of research currently involves blue emitters which are conversely susceptible to solar radiation interference. The study also used laser diodes over LEDs as the former could provide the capability of high speed modulation. LEDs hold the limitation in electron lifetimes or hole lifetimes, while laser diodes hold the limitation of photon lifetimes. This enables laser diodes to be far more advantageous in white light communications, which is what the researchers were attempting to achieve. The teams further stretched their research to study the possibilities of white light illumination that uses NUV LDs that were based off power density.
Higher Bandwidth Communications a Close Possibility
According to the researchers, the deployment of silicon APDs can be possible through the use of NUV LDs as they can offer higher bandwidth within a drive current of 600 mA to 400 mA. The study made use of a laser diodes that were mounted on a probe station for microwaves within a TEC. A distance of 1 cm to 2 cm was maintained between the phosphor and the laser diode.
Earlier works in this field by the researchers include the use of blue laser diodes and other elements to only end up gaining a CRI value of 58.