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A monolithic separate absorption and moduation region (SAM) wavelength converter is demonstrated. The transmitter consists of a sampled-grating DBR (SGDBR) laser and a series-push-pull Mach-Zehnder modulator. The preamplified receiver is composed of a flared semiconductor optical amplifier and a quantum-well pin photodetector. Integrated resistors and capacitors are used to minimize microwave losses and remove the need for external bias tees. The design, fabrication, and operation of this photonic integrated circuit is presented. Small-signal response measurements show a device bandwidth in excess of 20 GHz. Operation at 40 Gbps with NRZ data shows less than a 2.5-dB power penalty across the 32-nm laser tuning range with no additional power penalty for conversion to the input wavelength. [ABSTRACT FROM PUBLISHER]

We report on two novel approaches to improve the differential quantum efficiency (DQE) of widely tunable 1.55-μm lasers: the bipolar cascade sampled grating distributed Bragg reflector (BC-SGDBR) laser and the gain-levered SGDBR (GL-SGDBR) laser. Each is fabricated on a robust InGaAsP/InP photonic integrated circuit platform. The lasers demonstrate improved direct modulation performance over conventional SGDBR lasers. The BC-SGDBR laser was also monolithically integrated with a semiconductor optical amplifier and photodetector receiver in order to perform wavelength conversion. Error free wavelength conversion at 2.5 Gb/s and improvements in conversion efficiency are demonstrated. [ABSTRACT FROM PUBLISHER]

A novel two-tone measurement technique for characterizing distortion in optical phase modulators is proposed and demonstrated. The technique is used to characterize an InGaAsP-InP modulator in a monolithically integrated receiver. Results for forward and reverse bias conditions in the modulator show a phase IP3 of 7.2pi and 0.97pi rad, respectively [ABSTRACT FROM PUBLISHER]