Mach-Zehnder Interferometer · 1310 nm

This Mach-Zehnder interferometer is designed on a silicon photonics (SOI) platform for operation at 1310 nm with a compact-footprint objective, occupying 91.1 × 51 µm. Analytic estimates indicate a transmission efficiency of 91.6%, equivalently an insertion loss of 0.382 dB (the same quantity expressed two ways), across a bandwidth of 15.6 nm with a 50:50 split ratio. The design employs 0.4 µm waveguides, a 0.2 µm coupler gap with an 8 µm coupling length, 5 µm bend radii, and a 17 µm phase shifter; a deliberate 10.5 µm path-length imbalance between the arms makes the device wavelength-selective, with the bandwidth set by the resulting free-spectral-range. The estimated fabrication score is 92.9/100, indicating good manufacturability for the targeted compact layout.