Possible approach to improve sensitivity of a Michelson interferometer

We propose a possible approach to achieve an 1/N sensitivity of Michelson interferometer by using a properly designed random phase modulation. Different from other approaches, the sensitivity improvement does not depend on increasing optical powers or utilizing the quantum properties of light. Moreover the requirements for optical losses and the quantum efficiencies of photodetection systems might be lower than the quantum approaches and the sensitivity improvement is frequency independent in all detection band.Comment: 8 pages, 3 figures, new versio

50-dB Nonlinear Crosstalk Suppression in a WDM Analog Fiber System by Complementary Modulation and Balanced Detection

A technique for reducing crosstalk in analog WDM systems is described. This technique combines the modulated twin carriers technique with balanced detection. To facilitate measurements, relatively high crosstalk levels are produced by launching high powers into the fibers. A reduction of up to 50-dB and low residual crosstalk over the entire RF range is demonstrated at low frequencies.link_to_subscribed_fulltex