Author(s): Cui, PW (Cui, Pengwei); Ma, JC (Ma, Junchi); Wang, Y (Wang, Yue); Zhang, JS (Zhang, Jiashun); You, J (You, Jin); An, JM (An, Junming); Wu, YD (Wu, Yuanda)

Source: OPTICAL ENGINEERING Volume: 62 Issue: 11  DOI: 10.1117/1.OE.62.11.115101  Published: NOV 2023 

Abstract: A silica-based 90 deg optical hybrid based on a 4 x 4 multimode interference coupler with a refractive index contrast of 0.36% is designed and fabricated for coherent receiver. The measured results of this device show that the common mode rejection ratios are better than 23 dB and excess loss including a coupling loss of -0.3 dB is less than -0.9 dB in C band (1530 to 1565 nm). The phase error is less than 4 deg. The designed low-cost 90 deg optical hybrid is promising for further improving the sensitivity of quadrature phase shift keying coherent receivers.

Accession Number: WOS:001171514000015

ISSN: 0091-3286

eISSN: 1560-2303