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Electrical and electronic engineering
We derive an analytic equation for a ratiometric wavelength measurement system and analyze the influence of the optical source signal bandwidth. Our investigation shows that in a particular optical sensing system, the higher the bandwidth of the optical signal, the better resolution the system will achieve. Experiments based on two types of optical signals (output signal of a tunable laser and a fiber Bragg grating) were carried out, and experimental results verified both the simulation results and the theoretical analysis.
Wu, Q., Semenova, Y., Rajan, G., Wang, P., Farrell, G.:Study of the Effect of Source Signal Bandwidth on Ratiometric Wavelength Measurement. Applied Optics, Vol.49, no.29, 2010, p.5626