Abstract
This letter reports that a high-sensitivity OLCR incorporating a balanced detection scheme can be constructed using only one [3/spl times/3] fiber coupler, instead of a cascade connection of a few [2/spl times/2] fiber couplers. This is because two ports on the input side of the coupler can be used to perform balanced detection. A shot-noise limited sensitivity of -152 dB could be achieved without paying special attention to reducing reflection at the local oscillator port.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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