Optical-CDMA in InP

Abstract

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.

Analysis of hybrid mode-locking of two-section quantum dot lasers operating at 15 μm

“…optical time-domain multiplexed and wavelength-division multiplexed systems [1]. Current interest in these MLLDs lies in utilizing the coherent bandwidth that these lasers generate in combination with mature optical fiber-based technology in advanced optical (telecommunication) systems, such as optical code-division multiple-access systems [2], arbitrary waveform generation [3], clock distribution and as multi-wavelength sources for silicon-based integrated optics [4,5]. Moreover these MLLDs have found their way to other fields of research, such as biophotonics, since these wavelengths can have a larger penetration depth into human tissue [6], and frequency comb generation [7], e.g.…”

Photonic integration and optical interconnects for future communications, computing, and signal processing systems

“…Figure 5 shows the cross sectional view of the waveguide types in the optical-CDMA [5]and optical-label-switching router devices. The orientation of the cross sections is such that waveguide widths are displayed in the x-direction (lateral), thickness in the y-direction, and the propagation direction of the guided light in the z-direction (longitudinal).…”

Dynamic optical arbitrary waveform generation and detection in InP photonic integrated circuits for Tb/s optical communications

“…Although bulk-optic waveform shapers are capable of this, monolithically integrated InP OAWG devices which include high-speed modulator arrays and spectral demultiplexer/ multiplexers based on arrayed-waveguide gratings (AWGs) realize a compact solution [16]. Prior examples of monolithic InP integration include spectral phase encoding optical code-division multiple access (O-CDMA) transmitters and receivers [17], waveform shapers [18], wavelength-division multiplexing (WDM) transmitters and receivers [19], optical routers, and wavelength converters [20]. Challenges for terahertz-bandwidth InP OAWG device design and fabrication are the very high-resolution spectral multiplexers (e.g., b10 GHz channel spacing) and the large array (e.g., N200 elements) of complex modulation structures.…”