Abstract
An optical network made from two 3-dB and one 1.76-dB 2 × 2 single-mode couplers can perform as a 3 × 3 star coupler. One version is particularly suitable for polarization-preserving components and requires adjustment of the phase in one arm; it can also perform the three-point discrete Fourier transform by suitable adjustment of other phases. Experimental verification of the principle is presented.
© 1990 Optical Society of America
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