Optical cross-connect circuit using hitless wavelength selective switch.

We have proposed and demonstrated the basic elements of a full matrix optical switching circuit (cross-connect circuit) using a hitless wavelength selective switch (WSS). The cross-connect circuits are made of a multi-wavelength channel selective switch consisting of cascaded hitless WSSs, and a multi-port switch. These switching elements are realized through the individual Thermo-Optic (TO) tuning of a series-coupled microring resonator, and can switch arbitrary wavelength channels without blocking other wavelength channels during tuning. We demonstrate a four wavelength selective switch using a parallel topology of double series coupled microring resonators and a three wavelength selective switch using a parallel topology of quadruple series coupled microring resonators. Since the spectrum shape of quadruple series coupled microring is much more box-like than the double series, a high extinction ratio of 39.0-46.6 dB and low switching cross talk of 19.3-24.5 dB were achieved.

[1]  Ultracompact vertically coupled microring resonator with buried vacuum cladding structure , 2005, IEEE Photonics Technology Letters.

[2]  D. Gill,et al.  Compact full C-band tunable filters for 50 GHz channel spacing based on high order micro-ring resonators , 2004, Optical Fiber Communication Conference, 2004. OFC 2004.

[3]  Y. Kokubun,et al.  Fast and stable wavelength-selective switch using double-series coupled dielectric microring resonator , 2006, IEEE Photonics Technology Letters.

[4]  I. Kim,et al.  Vertical resonant couplers with precise coupling efficiency control fabricated by wafer bonding , 1999, IEEE Photonics Technology Letters.

[5]  Yasuo Kokubun,et al.  Wide-range tunable microring resonator filter by thermo-optic effect in polymer waveguide , 2003 .

[6]  T. Kaneko,et al.  Vertically coupled glass microring resonator channel dropping filters , 1999, IEEE Photonics Technology Letters.

[7]  R. Soref,et al.  Design and simulation of silicon microring optical routing switches , 2005, Journal of Lightwave Technology.

[8]  T. Kaneko,et al.  Second-order filter response from parallel coupled glass microring resonators , 1999, IEEE Photonics Technology Letters.

[9]  A. Agarwal,et al.  Fully programmable ring-resonator-based integrated photonic circuit for phase coherent applications , 2006, Journal of Lightwave Technology.

[10]  S. Chu,et al.  Microring resonator arrays for VLSI photonics , 2000, IEEE Photonics Technology Letters.

[11]  Yasuo Kokubun,et al.  Vertically Coupled Microring Resonator Filter for Integrated Add/Drop Node , 2005, IEICE Trans. Electron..

[12]  T. Kaneko,et al.  An eight-channel add-drop filter using vertically coupled microring resonators over a cross grid , 1999, IEEE Photonics Technology Letters.

[13]  Y. Kokubun,et al.  Multiwavelength and Multiport Hitless Wavelength-Selective Switch Using Series-Coupled Microring Resonators , 2007, IEEE Photonics Technology Letters.

[14]  Y. Kokubun,et al.  Loss-less multilevel crossing of busline waveguide in vertically coupled microring resonator filter , 2004, IEEE Photonics Technology Letters.

[15]  H. Haus,et al.  Microring resonator channel dropping filters , 1997 .

[16]  Y. Kokubun,et al.  Non-blocking wavelength channel switch using TO effect of double series coupled microring resonator , 2005, 2005 Pacific Rim Conference on Lasers & Electro-Optics.