@article{cochenour_mullen_muth_2011, title={Modulated pulse laser with pseudorandom coding capabilities for underwater ranging, detection, and imaging}, volume={50}, ISSN={["2155-3165"]}, DOI={10.1364/ao.50.006168}, abstractNote={Optical detection, ranging, and imaging of targets in turbid water is complicated by absorption and scattering. It has been shown that using a pulsed laser source with a range-gated receiver or an intensity modulated source with a coherent RF receiver can improve target contrast in turbid water. A blended approach using a modulated-pulse waveform has been previously suggested as a way to further improve target contrast. However only recently has a rugged and reliable laser source been developed that is capable of synthesizing such a waveform so that the effect of the underwater environment on the propagation of a modulated pulse can be studied. In this paper, we outline the motivation for the modulated-pulse (MP) concept, and experimentally evaluate different MP waveforms: single-tone MP and pseudorandom coded MP sequences.}, number={33}, journal={APPLIED OPTICS}, author={Cochenour, Brandon and Mullen, Linda and Muth, John}, year={2011}, month={Nov}, pages={6168–6178} }
 @inproceedings{simpson_cox_krier_cochenour_hughes_muth_2010, title={5 mbps optical wireless communication with error correction coding for underwater sensor nodes}, DOI={10.1109/oceans.2010.5664429}, abstractNote={One issue with underwater sensors is how to efficiently transfer large amounts of data collected by the node to an interrogating platform such as an underwater vehicle. It is often impractical to make a physical connection between the node and the vehicle which suggests an acoustic or optical wireless solution. For large amounts of data, the high bandwidth of underwater optical wireless is an advantage. A small, low-cost platform to demonstrate the potential of an optical wireless communications interface for underwater sensor nodes is demonstrated. To enhance the reliability and robustness of the optical wireless communication digital signal processing and error correction techniques are used. The system was tested in 3 and 7.7 meter tanks at 5 Mbps with the turbidity of the water controlled by the addition of Maalox.}, booktitle={Oceans 2010}, author={Simpson, J. A. and Cox, W. C. and Krier, J. R. and Cochenour, B. and Hughes, B. L. and Muth, J. F.}, year={2010} }
 @inproceedings{cox_gray_simpson_cochenour_hughes_muth_2010, title={A MEMS Blue/Green retroreflecting modulator for underwater optical communications}, DOI={10.1109/oceans.2010.5664432}, abstractNote={Short range, high bandwidth underwater optical communications links are potentially useful for retrieving stored information from underwater systems. However many underwater systems have limited power capacity or limited weight budget. The use of a modulating retroreflector eliminates the need for a transmitting laser on the data bearing platform and reduces the pointing requirements by retroreflecting the modulated light back to the interrogating source. Blue/green operation of a MEMS Fabry-Perot modulator was demonstrated at data rates of 500 kbps and 1 Mbps in a 7.7 meter tank with water conditions varied by the addition of Maalox as a scattering agent.}, booktitle={Oceans 2010}, author={Cox, W. C. and Gray, K. F. and Simpson, J. A. and Cochenour, B. and Hughes, B. L. and Muth, J. F.}, year={2010} }
 @article{cochenour_mullen_muth_2010, title={Effect of scattering albedo on attenuation and polarization of light underwater}, volume={35}, ISSN={["0146-9592"]}, DOI={10.1364/ol.35.002088}, abstractNote={Recent work on underwater laser communication links uses polarization discrimination to improve system performance [Appl. Opt.48, 328 (2009)] [in Proceedings of IEEE Oceans 2009 (IEEE, 2009), pp. 1-4]. In the laboratory, Maalox antacid is commonly used as a scattering agent. While its scattering function closely mimics that of natural seawaters, its scattering albedo can be much higher, as Maalox particles tend to be less absorbing. We present a series of experiments where Nigrosin dye is added to Maalox in order to more accurately recreate real-world absorption and scattering properties. We consider the effect that scattering albedo has on received power and the degree of depolarization of forward-scattered light in the context of underwater laser communication links.}, number={12}, journal={OPTICS LETTERS}, author={Cochenour, Brandon and Mullen, Linda and Muth, John}, year={2010}, month={Jun}, pages={2088–2090} }