GENERIC J1...J4 METHOD OF OPTICAL-PHASE DETECTION ACCURACY AND RANGE ENHANCEMENT

Two new expressions for the linear, direct measurement of dynamic phas e shift in a no-feedback, no-phase bias optical homodyne interferomete r are presented based on the recent, generic J1 ... J4 technique. Thes e new methods, the J1 ... J6(neg) and the J1 ... J6(POS) schemes, cons ider the voltage amplitude at the fundamental frequency and the next f ive harmonics in comparison to the four components utilized for the J1 ... J4 Method. With this development, the accuracy and the minimum de tectable phase shift (MDPS) are greatly improved by the J1 ... J6(neg) method, while the dynamic range of phase shift is enhanced by the J1 ... J6(pos) Method. An excellent agreement between the experimental re sults and the predicted values based on the 1/f noise model is demonst rated for all the three methods. For the experimental noise factor k o f 0.0011 for the particular set-up used, the MDPS is 0.05, 0.175 and 0 .2 rad respectively for the J1 ... J6(neg), J1 ... J4 and the J1 ... J 6(pos) methods.