A. Brinton Cooper

Heterodyne detection using spectral line pairing for spectral phase encoding optical code division multiple access and dynamic dispersion compensation

A novel coherent optical code-division multiple access (OCDMA) scheme is proposed that uses spectral line pairing to generate signals suitable for heterodyne decoding. Both signal and local reference are transmitted via a single optical fiber and a simple balanced receiver performs sourceless heterodyne detection, canceling speckle noise and multiple-access interference (MAI). To validate the idea, a 16 user fully loaded phase encoded system is simulated. Effects of fiber dispersion on system performance are studied as well. Both second and third order dispersion management is achieved by using a spectral phase encoder to adjust phase shifts of spectral components at the optical network unit (ONU).

Simulation and experimental demonstration of coherent OCDMA using spectral line pairing and heterodyne detection

A fully coherent optical code-division multiple access (OCDMA) scheme that combines spectral phase encoding (SPE) and spectral line pairing to generate signals through heterodyne decoding is proposed. A simple balanced receiver performs sourceless heterodyne detection, canceling speckle noise and multiple-access interference (MAI). A 16 user 100% load system transmitting at 40 Gbits is simulated, and a 4 user 50% load system transmitting at 4.25 Gbit/s is experimentally demonstrated for the first time.

Experimental demonstration of coherent OCDMA using heterodyne detection

We present the first experimental demonstration of a practical, fully coherent, optical code division multiple access (OCDMA) scheme that can fully suppress multiple access interference (MAI) and speckle noise without phase locking or thresholding and gating. The scheme is sourced from an optical comb generator and uses spectral phase encoding and a heterodyne receiver with balanced detection. Here we present results for a four-user configuration at 50% load. At 4.5 Gbits/s per user, the system achieves a signal to MAI ratio of 648 at a bit error rate of 10(-7).

Coherent OCDMA receivers with robust performance

Optical code division multiple access can achieve good spectral efficiency, a high degree of security, and soft degradation in many network applications. Robust performance in the presence of key impairments is achieved by careful selection of encoding sequences according to correlation properties and spread-time pulse shapes. A new, coherent receiver retrieves transmitted information coherently without phase locking or fast nonlinear detectors, while minimizing multiple access interference and cancelling beat noise. A key design improvement prevents link outage caused by random states of polarization without requiring polarization management.

Sequences for Impairment Mitigation in Coherent SPE-OCDMA

Robust performance of spectrally phase encoded OCDMA with key impairments depends on the encoding sequences, according to correlation properties and pulse shapes.

Painless Fully Orthogonal Coherent OCDM

Coherent phase coding and phase and polarization diversity detection offer realistic implementation of fully orthogonal large spectral density Optical Code Division Multiplexing (OCDM) that is completely free of multiple access interference and speckle noise.

Tagging Electronic ICs using Silicon Nitride Photonic Physical Unclonable Functions

We demonstrate an on-chip photonic physical unclonable function using integrated evanescently coupled multimode spiral waveguides formed in silicon nitride with rich spectral features and validate it for use in an identification tagging application for electronic ICs.

Light transport through ultrafast chaotic micro-cavities for photonic physical unclonable functions

We present a comprehensive ray tracing analysis of a novel photonic physical unclonable function (PUF) based upon the ultrafast nonlinear optical interactions in a silicon chaotic micro-cavity exploited for secure authentication and communication. The cavitys design exhibits complex chaotic behavior that ensures extreme sensitivity to the precise physical structure made unique through fabrication variances. As such, the PUFs security is partly ensured by the extreme difficultly faced in simulating a cavitys response with significant accuracy. However, general behavior from simulations can guide the design process to, for example, maximize response unpredictability and enhance interaction complexity. Although computational electrodynamic methods which solve Maxwells equations are prevalent, they have high processing costs which negate rapid design optimization. Here we show the results of a ray tracing analysis to quantify the chaotic nature of the device and examine the subsequent impact of fabrication variance. We further compare these results to finite element simulations and experimental results to examine accuracy. This computationally-efficient method can serve as a valuable tool in the development of these next-generation security devices.

Secure authentication using the ultrafast response of chaotic silicon photonic microcavities

We demonstrate a cryptographic primitive and authentication system based on the ultrafast response of reverberant integrated photonic cavities formed in silicon, which leverage the unpredictability of leaky chaotic systems.

Spectral line pairing for heterodyne OCDMA

A novel OCDMA scheme uses spectral line pairing to generate signals suitable for heterodyne decoding. Both signal and local reference are transmitted in one optical fiber and a simple balanced receiver performs sourceless heterodyne detection.