Joseph A. Summers

Widely tunable monolithically integrated all-optical wavelength converters in InP

Design, fabrication, and characterization of monolithically integrated widely tunable all-optical wavelength converters in InP is reported. The devices are based on the SGDBR laser integrated with different MZI-SOA wavelength converters. Error-free wavelength conversion at 2.5 Gbps was demonstrated over 50 nm input and 22 nm output wavelength range. Static operation, extinction ratio enhancement, signal reamplification, dynamic range, and chirp properties were characterized as well.

Monolithic Wavelength Converters for High-Speed Packet-Switched Optical Networks

This paper describes the design and demonstration of advanced 40-Gb/s return-to-zero (RZ) tunable all-optical wavelength converter technologies for use in packet-switched optical networks. The device designs are based on monolithic integration of a delayed interference Mach-Zehnder interferometer (MZI) semiconductor optical amplifier (SOA) wavelength converter with a sampled-grating distributed Bragg reflector tunable laser and an on-chip waveguide delay. Experimental results are presented demonstrating error-free wavelength conversion with 1-dB power penalty at 40-Gb/s data rates. By incorporating label modulation functionality on-chip along with a fast tunable 40-Gb/s wavelength converter, fully monolithic packet-forwarding chips are realized that are capable of simultaneous error-free wavelength conversion of 40-Gb/s payloads, remodulation of 10-Gb/s packet headers, and data routing through fast wavelength switching

Design and performance of a monolithically integrated widely tunable all-optical wavelength converter with independent phase control

We report on a new widely tunable all-optical wavelength converter consisting of a sampled-grating distributed Bragg reflector (SGDBR) laser monolithically integrated with a Mach-Zehnder interferometer semiconductor optical amplifier (MZI-SOA)-based wavelength converter. The new design incorporates independent phase control of the interferometer and SOAs for amplification of the SGDBR output. For the first time, error-free operation for data rates of up to 10 Gb/s is reported for 35-nm output tuning range. The high-speed operation is enabled by high photon density in the SOA due to large power transfer from the on-board tunable laser and amplifiers. We also report on device sensitivity of -10 dBm at 2.5 Gb/s and -5 dBm at 10 Gb/s, with an average output power of 0 dBm.

Performance optimization of an InP-based widely tunable all-optical wavelength converter operating at 40 Gb/s

We report on the design and performance optimization of a quantum-well active region-based semiconductor optical amplifier Mach-Zehnder interferometer wavelength converter monolithically integrated with a widely tunable sampled-grating distributed Bragg reflector laser, operating differentially at 40 Gb/s. The device is fabricated using an offset quantum-well platform, requiring a single regrowth. We show error-free operation, with a less than 3-dB power penalty at the optimal differential delay, and open eyes across a 25-nm output tuning range

A Monolithic All-Optical Push–Pull Wavelength Converter

We present the first two-stage all-optical push-pull wavelength converter, which has been monolithically integrated in indium phosphide, using an offset quantum-well platform. The device incorporates two cascaded wavelength converters, each with an integrated tunable sampled-grating distributed Bragg reflector laser, and deeply etched total internal reflection mirrors for a compact layout. The device, under push-pull operation, is demonstrated to reduce converted signal pattern dependence at 10 Gb/s, while providing improved phase swing compared to previous offset quantum-well designs. The device is shown to achieve full pi phase swing in the second-stage wavelength converter over a 12-dB input power range.

Design and Operation of a Monolithically Integrated Two-Stage Tunable All-Optical Wavelength Converter

We report on the design and testing of a novel two-stage wavelength-converter architecture, monolithically fabricated in indium phosphide. Two widely tunable integrated sampled-grating distributed Bragg reflector lasers are utilized on chip as probes in both converter stages. The architecture provides a first-stage tunable signal that is internal to the chip (lambdainternal), facilitating cascaded integration of wavelength-sensitive structures, or allowing wavelength conversion for cases where the input wavelength is equal to the output wavelength (lambdainput = lambdaoutput). Output wavelength tuning over 35 nm is shown, and error-free wavelength conversion for lambdainput = lambdaoutput is demonstrated for four wavelengths over a 20-nm range at 2.5 Gb/s. Dynamic range measurements show less than 2 dB of power penalty over a 15-dB variation in input power.

Recent progress on LASOR optical router and related integrated technologies

In this talk we review the latest progress on the DOD-N LASOR optical router project. Architectural studies including design and buffering will be discussed as well as prototype node performance. Recent results in integration in InP and Si/InP platforms will be described.

Quantum-well-intermixed monolithically integrated widely tunable all-optical wavelength converter operating at 10 Gb/s

This letter reports on an InP Mach-Zehnder interferometer semiconductor optical amplifier all-optical wavelength converter monolithically integrated with a sampled grating distributed Bragg reflector laser. The device is fabricated using centered quantum wells to achieve a high modal overlap with the active region. The active and passive waveguide regions are defined using an impurity-free quantum-well intermixing technique. The device is shown to perform error-free at 10-Gb/s data rates with a 30-nm output tuning range. The devices output power is also measured to be >3 dBm across the range.

Monolithically Integrated Multi-Stage All-Optical 10Gbps Push-Pull Wavelength Converter

This paper reports on the novel design and operation of a monolithically integrated multi-stage push-pull wavelength converter. Results show 4 dB improvement in extinction ratio and error-free performance for 10Gbps push-pull operation.

40Gbps operation of an offset quantum well active region based widely-tunable all-optical wavelength converter

We demonstrate for the first time 40 Gbit/s operation of a quantum well based monolithically integrated widely tunable all-optical wavelength converter. We show open eyes at 40 Gbit/s RZ with an output switching window of 6 ps and low pattern dependence across a 25 nm output tuning.