Francisco M. Soares

Monolithic InP 100-Channel

We demonstrate monolithic integration of a 100-channel arrayed-waveguide grating (AWG) with 10-GHz channel spacing and 100 optically controlled Michelson-interferometer-based phase and amplitude modulators. The high-resolution AWG showed better than -15-dB crosstalk, and the modulator extinction ratio was better than 20 dB with either electrical or optical modulation control. The twin-integrated devices comprise a 50-mm diameter InP wafer with 1200 independent optoelectronic components.

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This paper describes the InP platforms for photonic integration and the development on these platforms of an optical code division multiple access (O-CDMA) system for local area networks. We demonstrate three building blocks of this system: an optical pulse source, an encoder/decoder pair, and a threshold detector. The optical pulse source consists of an integrated colliding pulse-mode laser with nearly transform-limited 10 Gb/s pulses and optical injection locking to an external clock for synchronization. The encoder/decoder pair is based on arrayed waveguide gratings. Bit-error-rate measurements involving six users at 10 Gb/s showed error-free transmission, while O-CDMA codes were calibrated using frequency resolved optical gating. For threshold detection after the decoder, we compared two Mach--Zehnder interferometer (MZI)-based optical thresholding schemes and present results on a new type of electroabsorber-based MZI.

10-GHz Device for Optical Arbitrary Waveform Generation

We demonstrate a compact monolithically-integrated InP optical arbitrary waveform generator, consisting of an arrayed waveguide grating pair with 10 GHz channel spacing, 10 high-speed optical amplitude modulators, and 10 high-speed optical phase modulators.

Optical-CDMA in InP

This letter demonstrates a 1-GHz hybrid mode-locked monolithic semiconductor laser fabricated on indium phosphide. Its operating regimes are explored and optical pulses as short as 36 ps were measured. The linear cavity is 41 mm long with integrated active quantum well and passive waveguide structures. To our knowledge, this is the lowest reported repetition rate for a monolithically integrated mode-locked semiconductor laser. We further describe optimization steps of the saturable absorber reverse bias, driving RF frequency, and the semiconductor optical amplifier gain current for minimal output pulsewidth.

A Monolithic InP-based Photonic Integrated Circuit for Optical Arbitrary Waveform Generation

This letter reports on 10-GHz and 20-GHz channel-spacing arrayed waveguide gratings (AWGs) based on InP technology. The dimensions of the AWGs are 6.8 times 8.2 mm2 and 5.0 times 6.0 mm2, respectively, and the devices show crosstalk levels of -12 dB for the 10-GHz and -17 dB for the 20-GHz AWG without any compensation for the phase errors in the arrayed waveguides. The root-mean-square phase errors for the center arrayed waveguides were characterized by using an optical vector network analyzer, and are 18deg for the 10-GHz AWG and 28deg for the 10-GHz AWG.

1-GHz Monolithically Integrated Hybrid Mode-Locked InP Laser

We successfully demonstrate a spectral phase-encoded time-spreading (SPECTS) optical code-division multiple-access (O-CDMA) field trial on an 80.8-km link within the Boston-South Network (BOSSNET) using a fully-integrated, polarization-independent arrayed-waveguide grating (AWG)-based encoder/decoder. The subpicosecond pulse source is based on an ultrastable optical frequency comb generator employing dispersion-decreasing fiber. A novel tunable dispersion-slope compensator enables the use of subpicosecond pulses without extensive characterization of the field-deployed fiber. Bit-error rate (BER) and Ethernet traffic statistics are presented.

10-GHz and 20-GHz Channel Spacing High-Resolution AWGs on InP

We realize a high-precision 10-channel InP-based arrayed-waveguide grating (AWG) with a 10-GHz channel spacing. The AWG showed approximately 10 dB excess-loss, 10 dB crosstalk, and 8.2 × 6.8 mm2 dimensions.

80.8-km BOSSNET SPECTS O-CDMA Field Trial Using Subpicosecond Pulses and a Fully Integrated, Compact AWG-Based Encoder/Decoder

We realize a 32-channel InP-based arrayed-waveguide grating (AWG) with a 5-GHz channel spacing. The AWG shows approximately 14 dB excess-loss, 9 dB crosstalk, and 21 times 22 mm2 dimensions.

InP-Based Arrayed-Waveguide Grating with a Channel Spacing of 10 GHz

Single-shot, amplitude and phase characterization of 160-GHz bandwidth optical waveforms with 2-μs record lengths using a bandwidth- and time-record scalable technique based on parallelized balanced four-quadrature homodyne detection and DSP reconstruction.

5 GHz channel spacing InP-based 32-channel Arrayed-Waveguide Grating

A 1-GHz hybrid mode-locked monolithic semiconductor laser on an InP platform is demonstrated. Monolithic integration of the 4.1 cm laser with active quantum well and passive waveguide is achieved with 1-D photonic crystal mirrors.