We demonstrate logic functionalities in a high-speed all-optical logic circuit based on differential Mach-Zehnder interferometers with semiconductor optical amplifiers as the nonlinear optical elements. The circuit, implemented by hybrid integration of the semiconductor optical amplifiers on a planar lightwave circuit platform fabricated in silica glass, can be flexibly configured to realize a variety of Boolean logic gates. We present both simulations and experimental demonstrations of cascaded all-optical operations for 80-Gb/s on-off keyed data.

We transmit 40-Gb/s optical packets through a load-balanced optical packet router consisting of two 16 × 16 arrayed waveguide gratings, wavelength converters, and an optical-time buffer. The optical router interoperates with an electronic router with 10-GbE interfaces.

We present results of the IRIS project, a DARPA-MTO funded program to develop a router with an all-optical data plane and a total capacity of more than 100 Tb/s.

A monolithically-integrated wavelength converter on an InP platform with a semiconductor optical amplifier in each arm of a differential Mach-Zehnder interferometer is presented. The data input has a tunable coupler that adjusts the splitting ratio of the optical power sent to each arm. Wavelength conversion at 40 Gbit/s is demonstrated and a conversion penalty of <2 dB is found when less optical power is sent to the delayed arm.

We demonstrate an optical time buffer technology that meets the requirements of an all-optical packet router with a load-balancing architecture. The buffer is based on wavelength switching and an arrayed waveguide grating, which selects one of the delays in an array of fiber delay lines of increasing length. This buffer is unique because it enables the maximal sharing of delay lines among multiple input ports. Each of the N delays can simultaneously support N different wavelengths; therefore, for N input ports, the total buffer capacity is of the order of N3 packets. Measurements performed with data at 10 Gbits/s and N=3 show that there is only a 2 dB bit error rate (BER) penalty resulting from wavelength switching.

We report experiments on a continuously tunable true time delay and demonstrate high resolution tuning for the first time using a multi-stage all-pass filter device implemented with Ge-doped silica planar lightwave circuits.

We have fabricated and characterized fiberized MEMS in situ power monitor chips in which a surface-micromachined out-of-plane micromirror partially reflects the incident multimode light to an on-chip fiber tap. Reflectivity and transmittivity were measured as a function of time at various increasing incident optical power levels, and for various material systems. The first prototypes show stability to hundreds of milliwatts.

We report Yb-doped cladding-pumped fiber lasers with two fiber Bragg gratings and a cascaded Raman laser that yield unprecedented power levels (16.4 W at 1065 nm, 20.4 W at 1101 nm, and 8.5 W at 1472 nm) in a single-mode fiber.