Abstract
The two-peak method has been widely used to expand the measurement range of F-P cavities in the past decades. Previous studies have found that a dozen peak pairs should be involved to calculate the average value to reduce the possibility of misjudgment of the interference order m. This paper analyzes the impact of data error on the two-peak method and proposes the condition for correctly judging m using only one peak pair or peak-valley pair at the current technical level: m <1000. For experimental verification, a force sensor based on an integrated LiNbO3 asymmetric Mach-Zehnder interferometer (AMZI) with m around 30 is fabricated and tested. The measurement range is originally 63 N due to the limitation of FSR (free spectral range). With the help of the two-peak method with only one peak-valley pair, the measurement range is successfully increased to 150 N. Experimental data show that the two-peak method exhibits a large tolerance when m is far less than 1000. This result extends the application of the two-peak method to the field of integrated optical sensors.
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