Off-Chip Polarization-Diversity $4 \,\, \times \,\, 4$ Si-Wire Optical Switch With Digital DGD Compensation

A 4 × 4 Si-wire path-independent insertion-loss optical switch having off-chip polarization diversity is demonstrated. The polarization diversity is achieved using off-chip components of polarization-maintaining fiber arrays and fiber-based polarization splitters and combiners. A path-independent on-chip loss of 4.8 ± 0.5 dB is obtained with a polarization-dependent loss below 1 dB. Crosstalk of the switch is measured to be -30 and -20 dB for the bandwidths of 2.9 and 12.9 nm, respectively, for all switch settings. The residual differential group delay (DGD) is <;8 ps. Penalty-free 100-Gb/s dual-polarization quadrature-phase-shift-keying signal transmission is also demonstrated with residual DGD compensation by digital signal processing.

[1]  T. Tsuchizawa,et al.  Low loss mode size converter from 0.3 /spl mu/m square Si wire waveguides to singlemode fibres , 2002 .

[2]  G. Cong,et al.  Ultra-compact 32 × 32 strictly-non-blocking Si-wire optical switch with fan-out LGA interposer. , 2015, Optics express.

[3]  Ken Tanizawa,et al.  4×4 Si-wire optical path switch with off-chip polarization diversity , 2015, 2015 Opto-Electronics and Communications Conference (OECC).

[4]  Young-Kai Chen,et al.  Compact, low-loss and low-power 8×8 broadband silicon optical switch. , 2012, Optics express.

[5]  Ken Tanizawa,et al.  Ultra-compact 8 × 8 strictly-non-blocking Si-wire PILOSS switch. , 2014, Optics express.

[6]  S. Namiki,et al.  First demonstration of ultra-low-energy hierarchical multi-granular optical path network dynamically controlled through NSI-CS for video related applications , 2014, 2014 The European Conference on Optical Communication (ECOC).

[7]  S. Bigo,et al.  Linear Fiber Impairments Mitigation of 40-Gbit/s Polarization-Multiplexed QPSK by Digital Processing in a Coherent Receiver , 2008, Journal of Lightwave Technology.

[8]  Hiroshi Takahashi,et al.  Compact 8×8 silica-based PLC switch with compressed arrangement , 2005 .

[9]  William C. Banyai,et al.  Modular MEMS design and fabrication for an 80 x 80 transparent optical cross-connect switch , 2004, SPIE Optics East.

[10]  Alexander V. Rylyakov,et al.  Monolithic Silicon Integration of Scaled Photonic Switch Fabrics, CMOS Logic, and Device Driver Circuits , 2014, Journal of Lightwave Technology.

[11]  Minoru Ohtsuka,et al.  Low-loss, flat-topped and spectrally uniform silicon-nanowire-based 5th-order CROW fabricated by ArF-immersion lithography process on a 300-mm SOI wafer. , 2013, Optics express.

[12]  Guo-Qiang Lo,et al.  Wavelength selective switching with one-chip silicon photonic circuit including 8 × 8 matrix switch , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.