A new device converting optical analog signals to light pulse density signals for fiber-optic sensing system

Signal conversion of optical analog signals to light pulse density signals was accomplished using a p-n-p-n LED and a simple passive RCL circuit. The light pulse density was 0.69 Mbit/s. The variable ratio per 1 μW of incident light power was 0.8 kbit/s. The peak wavelength, half width, detecting wavelength range, and output light power of the p-n-p-n LED were 900, 60, 650-900 nm, and 1.2 mW/50 mA, respectively.