Optical Link Tests

This report describes measurements to characterize an RF-over-fiber link using a YiGuDian laser diode (LD, Part Number GLD-PSA2-D3160B-2GR, Serial Number 180516-002) and a YiGuDian photodiode (PD, PN GPD-PSA1-55BR, SN 180511-002). The objective is to characterize the phototonic components alone, without any other circuitry. It complements and extends the results in [1], which were measured on the same units. For RF tests, the laser diode was driven directly from a 50-ohm source, and the photodiode was connected directly to a 50 ohm load. DC bias was supplied through high RF impedances. This means that the source and load were highly mismatched, since the RF impedance of the laser is 4 to 5 ohms and that of the photodiode is many thousands of ohms. However, all measurements were below 100 MHz and connections were via wires no more than 2 cm long.