Ultra-broadband, polarization-insensitive SMF-28 fiber edge couplers for silicon photonics

We have designed, fabricated and tested edge couplers for silicon photonics targeting industry-standard SMF-28 fibers. These edge couplers are based on a SiN inverse taper fabricated on a silicon-on-insulator (SOI) platform combined with an etch-based substrate removal process that prevents leakage of the expanded mode to the underlying silicon substrate. The measured couplers exhibited a 0.5 dB bandwidth exceeding 100 nm, polarization dependent loss (PDL) of less than 0.5 dB and coupling efficiency of approximately −3 dB in O-band. Similarly, a 1 dB bandwidth exceeding 100 nm, PDL less than 1 dB and coupling efficiencies of −3 dB and better than −4 dB for TE and TM modes respectively were demonstrated across the C- and L-bands.

[1]  Siegfried Janz,et al.  Fiber-chip edge coupler with large mode size for silicon photonic wire waveguides. , 2016, Optics express.

[2]  Peter De Heyn,et al.  50Gb/s silicon photonics platform for short-reach optical interconnects , 2016, 2016 Optical Fiber Communications Conference and Exhibition (OFC).

[3]  Antao Chen,et al.  Efficient fiber coupler for vertical silicon slot waveguides. , 2009, Optics express.

[4]  Chao Li,et al.  Si-photonics based passive device packaging and module performance. , 2011, Optics express.

[5]  Lei Liu,et al.  Low-loss and misalignment-tolerant fiber-to-chip edge coupler based on double-tip inverse tapers , 2016, 2016 Optical Fiber Communications Conference and Exhibition (OFC).

[6]  F. Gomez-Agis,et al.  The BOOM Project: Towards 160 Gb/s Packet Switching Using SOI Photonic Integrated Circuits and Hybrid Integrated Optical Flip-Flops , 2012, Journal of Lightwave Technology.

[7]  Tymon Barwicz,et al.  An o-band metamaterial converter interfacing standard optical fibers to silicon nanophotonic waveguides , 2015, 2015 Optical Fiber Communications Conference and Exhibition (OFC).

[8]  G. Roelkens,et al.  Efficient silicon-on-insulator fiber coupler fabricated using 248-nm-deep UV lithography , 2005, IEEE Photonics Technology Letters.

[9]  Benjamin G Lee,et al.  Multichannel High-Bandwidth Coupling of Ultradense Silicon Photonic Waveguide Array to Standard-Pitch Fiber Array , 2011, Journal of Lightwave Technology.

[10]  P. Verheyen,et al.  Comparison of heater architectures for thermal control of silicon photonic circuits , 2013, 10th International Conference on Group IV Photonics.