Adaptive optics is used to compensate for modal dispersion in digital transmission through multimode fiber (MMF). At the transmitter, a spatial light modulator (SLM) controls the launched field pattern. An estimate of intersymbol interference (ISI) caused by modal dispersion is formed at the receiver and fed back to the transmitter, where the SLM is adjusted to minimize ISI. Error-free transmis...

This paper presents performance analysis of Peak to Average Power Ratio (PAPR) Reduction techniques in Orthogonal Frequency Division Multiplexing (OFDM) System such as Clipping, Partial Transmit Sequence (PTS), Selective Mapping (SLM) and SLM with Clipping (Hybrid Scheme) .Complementary Cumulative Distribution Function (CCDF) is calculated for each technique with different number of sub carrier...

We have combined a spatial light modulator (SLM) and galvanometer-mounted mirrors into an optical tweezers set-up. This provides great flexibility by allowing us to create an array of traps which can be moved in a smooth and fast way. To optimise the performance we investigated the effect of incidence angle on the SLM with respect to phase and intensity response. Although it is possible to use ...

In this work, a novel single-longitudinal-mode (SLM) four-wavelength laser configuration for sensing applications in L-band is proposed and experimentally demonstrated. This spectral region presents some advantages for the detection of dangerous gases. The sensor system presented here is based on ring resonators, and employs fiber Bragg gratings to select the operation wavelengths. The stable S...

Selected mapping (SLM) is a suitable scheme, which can solve the peak-to-average power ratio (PAPR) problem. Recently, many researchers have concentrated on reducing the computational complexity of the SLM schemes. One of the low complexity SLM schemes is the Class III SLM scheme which uses only one inverse fast fourier transform (IFFT) operation for generating one orthogonal frequency division...

Orthogonal Frequency Division Multiplexing (OFDM) is high speed data transmission scheme. It has got various advantages like easy and efficient in dealing with multi-path, robust against narrow-band interference, supports various modulation schemes and perfect for MIMO etc. In spite of having various advantages it has got one major drawback of high Peak to Average Power Ratio (PAPR). One of the...

Abstract Peak-to-average power ratio (PAPR) reduction is still an important issue in the next-generation mobile communication networks using higher frequency bands. Recently, we have proposed a PAPR reduction technique called blind selected mapping (blind SLM), which does not require side-information transmission and is able to reduce the PAPR effectively without bit-error rate (BER) degradatio...

In close collaboration with four German universities, we have developed tutorials for experiments based on a transmissive liquid-crystal spatial light modulator (SLM). The experimental tutorials are grouped in six project modules, which cover a wide range of phenomena and have different levels of difficulty. At a basic level, students can investigate the SLM in its probably most well-known appl...

We present a microscope that has the capability of adapting to various object characteristics by applying different filters in the Fourier plane of the imaging path. To this end we use a spatial light modulator and display different computer generated holograms. This allows us to realize several phase contrast techniques, dynamic aberration correction, pseudostereoscopic microscopy and confocal...