High-speed measurement of free spectral range voltage of tunable filters.
A new technique to measure the frequency response of a fiber-optic tunable filter (TF) is proposed and demonstrated. This technique is based on the linearity of the sinusoidal function in the vicinity of mpi, where m is an integer. The free spectral range (FSR) voltage, V(FSR), is evaluated fast and accurately by measuring the time interval corresponding to the bandwidth of TF. The time interval is obtained by adjusting the dc offset of the driving signal to locate the transmission peak of TF at the maximum slope of the driving signal of <1V(p-p). The measured FSR voltages range from 500 mV to 100 V over the frequency up to 200 kHz.
Yeh
Yunhae
Y
School of Electronics and Information, Institute for Laser Engineering, Kyung Hee University, YongIn, Korea. yhyh@khu.ac.kr
Park
DoHyun
D
Park
Se Hoon
SH