We describe a wide range of reconfigurable optical add-drop multiplexer architecture designs that may be implemented in standard silica-on-silicon planar lightwave circuits. This proven, reliable technology offers high performance and cost-effective solutions for reducing complex service provisioning in reconfigurable optical networks. Recent advances enable very flexible wavelength routing devices for mesh- and ring-based networks to be implemented on a common subsystem integration platform. We show excellent system performance at 10 Gb/s.

A 16-channel 100-GHz-spacing wavelength selective cross connect is demonstrated using a combination of planar waveguides and MEMS piston-mirrors. Interswitch crosstalk is eliminated and switching speed is an order of magnitude faster than typical thermooptic switches. The power consumption is smaller than one microwatt per switch. An extinction ratio of 20 dB and an insertion loss of 10.6 dB are demonstrated.

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text M. Earnshaw, M. Cappuzzo, E. Chen, L. Gomez, A. Griffin, E. Laskowski, and A. Wong-Foy, "Reconfigurable Optical Add-Drop Multiplexer (ROADM) with full add and drop path crossconnect," in Optical Amplifiers and Their Applications/Integrated Photonics Research, Technical Digest (CD) (Optica Publishing Group, 2004), paper IThA2. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

Fully integrated variable optical attenuator multiplexers (VMUX) with substantial performance improvements, notably very low loss and PDL, are reported. Reduced power consumption by deep etching is also demonstrated.

We combine a PLC and free-space optics for a compact Fourier-plane pulse shaper with low polarization dependencies. A micromirror array with piston motion provides phase modulation. The shaped electric field is extracted from a recorded spectrogram of the synthesized waveform.

The retiming and reshaping properties of a 160 Gbit/s all-optical wavelength converter based on a semiconductor optical amplifier gating delay interferometer configuration is investigated. 160 Gbit/s operation is performed with as little as -3.5 dBm input signal.

We previously reported a simple 10-Gb/s Mach-Zehnder-interferometer-type tunable dispersion compensator that requires only one control voltage. However, we used an expensive polarization-diversity scheme to achieve polarization independence. Here, we take advantage of the device symmetry and use a single half-wave plate to achieve low polarization sensitivity, saving significant cost and size. We demonstrate 200-km transmission of 10-Gb/s chirped nonreturn-to-zero data with only 1.8-dB path penalty.

We integrated a wavelength-selective cross-connect, de-interleaver, interleaver, power combiner, and variable attenuators on one silica waveguide chip and a band demultiplexer, band multiplexer, and optical monitor on another. These two chips are used to create an eight-channel add-drop node that is expandable up to 80 channels with minimal traffic interruption by adding more of these chips.

An endless, reset-free polarization controller implemented with planar lightwave circuits using phase shifters for tuning is proposed and demonstrated. By avoiding the need for tunable polarization mode converters, simple fabrication processes and a large range of material systems can be used, since neither the electrooptic effect nor a rotatable birefringence axis are necessary for device operation. The proof of concept is demonstrated by implementing the equivalent of a rotating waveplate using Ge-doped silica-on-silicon waveguides; and thermooptic phase shifters. The polarization controller is shown to have excellent tolerance to fabrication variations. Fast thermooptic control (on the order of 10 kHz) is achieved using high-index-contrast (4%) waveguides.

The first demonstration of large-scale integration of AWG filters and thermo-optic switches and attenuators in 2% delta silica-on-silicon waveguides is reported. A compact high performance wavelength selective switch is demonstrated.

We report an 8/spl times/8 strictly nonblocking optical cross connect (OXC) using multimode imaging (MMI)-based generalized Mach-Zehnder (MZ) interferometers realized in the silica-on-silicon planar waveguide system. Employing a router-selector architecture, this MMI-MZ OXC design results in a significantly smaller device than conventional directional-coupler based implementations. An average insertion loss of 6 dB and crosstalk of -34 dB, is demonstrated for the 8/spl times/8 OXC.

The authors demonstrate an integrated add-drop filter with true reconfigurability. It can drop any combination of eight wavelengths to any of eight drop ports, with less than 7 dB loss. Its features are suitable for mass production: use of standard silica waveguide technology, double-rejection switching and filtering for all paths, compactness, and power-efficient thermooptic switching.

We present a fully integrated 20-channel wavelength selective switch with reduced size and power consumption. We show for the first time large-scale integration of AWG filters and thermo-optic switches and attenuators in 2% delta silica-on-silicon waveguides. The on-chip loss is less than 7 dB with 3 OdB isolation performance.

The limitations imposed by the frequency standards on the performance of N/spl times/N arrayed waveguide gratings (AWGs) are reviewed for different device layouts. An improved design that allows for an enhanced frequency accuracy of the transmission response of the device is presented and experimentally verified. The maximum deviation from the frequency standards is reduced by almost a factor of two in a 32 /spl times/ 32 AWG with 100 GHz channel spacing.

We present an efficient 2 /spl times/ 2 wavelength-selective cross connect that is serviceable without interrupting traffic. It can handle over a hundred channels in a compact fashion by operating on them in sets. The 50-GHz-spaced passbands are flat-topped with no gaps between them, and so it has high cascadability and can exhibit variable-bandwidth switching. It also can multicast. Index Terms-Cross connect, glass materials/devices, optical phase shifters, waveguide filters, wavelength-division multiplexing.

We present an integrated-optics device that switches any of eight wavelengths from one input fiber to any of nine output fibers with <7 dB loss. Its features are suitable for mass production: use of standard silica waveguides, double-rejection switching and filtering for all paths, and compactness.

The limitations imposed by the frequency standards on the performance of N x N arrayed waveguide gratings (AWGs) are reviewed for different device layouts. An improved design that allows for an enhanced frequency accuracy of the transmission response of the device is presented and experimentally verified. The maximum deviation from the frequency standards is reduced by almost a factor of two in a 32 x 32 AWG with 100 GHz channel spacing.

We present a planar 40-wavelength 100-GHz spacing channel-dropping filter with wide in-to-through stopbands and low in-to-drop crosstalk, yet highly cascadable in-to-through passbands without significant excess loss or large physical size.

We demonstrate a 1.2 Tb/s optical packet switch fabric based on burst-mode clock-data-recovery at 40 Gb/s with packet separations of up to 400 ns and lock times under 5 ns. fast wavelength switching between 32 channels in less than 46 ns. and a 42x42 AWG with a worst-case loss of 4.2 dB.

A 4 x 4 strictly non-blocking optical cross-connect fabricated in silica-on-silicon waveguide technology using 1 x 4 MMI-based generalised Mach-Zehnder interferometers is reported. The loss of the switch is 2.8dB and the average crosstalk is 35dB.