Channel simulation for direct detection optical communication systems

A technique is described for simulating the random modulation imposed by atmospheric scintillation and transmitter pointing jitter on a direct detection optical communication system. The system is capable of providing signal fading statistics which obey log normal, beta, Rayleigh, Ricean or chi-squared density functions. Experimental tests of the performance of the Channel Simulator are presented

Polarization compensator for optical communications

An optical data communication system is provided whereby two orthogonal polarization states of a light beam carrier correspond to digital states. In such a system, automatic polarization compensation is provided by applying a dither modulating voltage to a cell exhibiting the electro-optic effect. The cell controls the relative phase of electric field components of an input light beam enabling the dither frequency component of the difference of the instantaneous powers in the two polarization states to be coherently detected. A signal derived from the coherent detection process is fed back to the cell via an integrator to form polarization bias compensating servo loop ot Type 1

Retrodirective modulator Patent

Optical retrodirective modulator with focus spoiling reflector driven by modulation signa

Dynamic polarization compensating system for optical communications receiver

Electro-optic cell is located in optical path of input light beam. Cell includes crystal for controlling phase between two polarization states. Cell axes are rotated 45 deg to receiver axes defined by vertical and horizontal polarization states. Voltage across cell compensates for bias by introducing different phase retardation along crystal axes

Human Right to Clean Environment and the Rights of Nature in the Anthropocene

This article examines the role of environmental human rights and the rights of nature in the era of the Anthropocene. The research question is whether the concept of the Anthropocene itself is a constructive remedy for the ecological destruction. The United Nations General Assembly resolution acknowledging a universal human right to clean environment is a ground-breaking event in a long process of the creation of such a right. This article examines the status quo of this right at present, both generally and in regional human rights treaties, as well as in the relevant case law and literature. The rights of nature are also examined, as they have become a very topical issue in light of the recent decision of the Conference of the Parties of the Convention on Biological Diversity, which expressly grants such a right. The question which may be posed is whether the approach adopted by the Anthropocene – which treats all actors equally – reflects the reality. The Western (Global North) approaches to the destruction of the Earth are contested by the Global South. The fractured approaches (by both the Global South and the Global North) to the decline of the environment may render questionable the suitability of the Anthropocene paradigm

Wavelength dependence of laser beam scintillation

Laser beam scintillation and log-amplitude variance evaluation for wavelengths on digital compute

NASA ground-based and space-based laser ranging systems

Laser ranging is expected to help unlock the mysteries of the earthquake phenomenon by producing unique results of crustal motions of the Earth. The current state of the art and future projections are presented, including principal applications and characteristics of typical systems

A focus spoiling retrodirective modulator

Optical modulator for satellite to ground or ground to ground laser communication lin

Prelaunch testing of the GEOS-3 laser reflector array

The prelaunch testing performed on the Geos-3 laser reflector array before launch was used to determine the lidar cross section of the array and the distance of the center of gravity of the satellite from the center of gravity of reflected laser pulses as a function of incidence angle. Experimental data are compared to computed results