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  Indian J Med Microbiol
 

Figure 2: A 2-stage MZI configuration through concatenation of 3 couplers K1, K2, and K3, and 2 delay lines ΔL1 and ΔL2, introduced in the upper arms of the first and second stages, respectively.

Figure 2: A 2-stage MZI configuration through concatenation of 3 couplers K<sub>1</sub>, K<sub>2</sub>, and K<sub>3</sub>, and 2 delay lines Δ<i>L</i><sub>1</sub> and Δ<i>L</i><sub>2</sub>, introduced in the upper arms of the first and second stages, respectively.