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.
© 2010 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: July 6, 2010
Revised Manuscript: September 9, 2010
Manuscript Accepted: September 9, 2010
Published: October 7, 2010
Qiang Wu, Yuliya Semenova, Ginu Rajan, Pengfei Wang, and Gerald Farrell, "Study of the effect of source signal bandwidth on ratiometric wavelength measurement," Appl. Opt. 49, 5626-5631 (2010)