Lawrence Livermore National Laboratory (LLNL) researchers have developed a new type of inline optical fiber amplifier that could potentially double the information-carrying capacity of fiber-optic cables.
The team built a custom optical fiber that suppressed lasing at 1,064 nm and amplified light preferentially at 920 nm. In the course of testing the 920-nm laser, the team observed in the fluorescent spectra that the fiber also showed signs of amplification at 1,400-1,450 nm—a wavelength that never worked previously. The team then redesigned the fiber to suppress laser action at both 1,064 nm and 920 nm. This new fiber, which completely eliminates the potential for lasing at 920 nm or 1,064 nm, can now only provide gain on the 1,330-nm laser transition. Excited-state absorption still precludes amplification at 1,330 nm, but the laser line amplifies light across a large range of wavelengths.
The amplifiers would potentially allow telecom companies to more heavily leverage their installed base of equipment, requiring less capital investment than new cable—resulting in expanded bandwidth and lower costs to the end user.
News Source: https://phys.org
Post time: Dec-27-2019