  A novel parallel optical delay detector (PODD) is proposed for
angle-of-arrival (AOA) measurement of a microwave signal with selective
measurement range and signal-to-noise (SNR) enhancement. The PODD is
experimentally demonstrated by using a dual parallel Mach-Zehnder modulator.
The noise robustness enhancement is experimentally investigated. Based on the
proposed PODD, the measurement error for the full range can be less than 0.02
radian (0.71% of full measured range).
