In this paper we perform an optimization of Brillouin optical time-domain analysis (BOTDA) sensors for achieving high resolution over long sensing ranges using distributed Raman amplification. By employing an optimized first-order bi-directional Raman amplification scheme and combining high-power fiber-Raman lasers and Fabry-Pérot lasers with low relative-intensity-noise (RIN), we demonstrate d...

A systematic treatment of the influence optical feedback (OFB) and ratio radiative non-radiative recombination lifetime (τr/τnr) on relative intensity noise (RIN) system dynamics a semiconductor laser (SL) is presented. We found that τr/τnr causes significant change in noise, states, route to chaos such system. Laser transit from continuous wave (CW) periodic oscillation (PO) becomes faster ter...

We introduce modeling and simulation of the noise properties associated with types modal oscillations induced by scaling asymmetric gain suppression (AGS) in multimode semiconductor lasers. The study is based on numerical integration a system rate equations 21-oscillating modes taking account self- cross-modal mechanisms. AGS varied terms pre-defined parameter, which controlled linewidth enhanc...

The short-term sensitivity of a several-kilometers long fiber-optic gyroscope (FOG) is limited mainly by thermal phase noise (TPN) and relative intensity (RIN). Increasing the modulation frequency decreases TPN but not RIN since it behaves as white noise. Here, we propose experimentally demonstrate that angular random walk (ARW) can be effectively decreased suppressing at its third-order harmon...

The optical feedback tolerance (OFT) of a distributed Bragg reflector (DBR) laser was investigated experimentally. static and modulation performance the DBR under examined by evaluating its relative intensity noise (RIN) bit error rate (BER). It is shown that OFT closely related to peak wavelength detuning wavelength. A high demonstrated, both in continuous wave (CW) direct (DM) states, when re...

We present, for the first time, a detailed investigation of the impact of second order co-propagating Raman pumping on long-haul 100G WDM DP-QPSK coherent transmission of up to 7082 km using Raman fibre laser based configurations. Signal power and noise distributions along the fibre for each pumping scheme were characterised both numerically and experimentally. Based on these pumping schemes, t...

In this letter, the characteristics of noise and long-term stability near- mid-infrared (near-IR mid-IR) gas-filled fiber Raman lasers have been investigated for first time. The results reveal that an increase in pulse energy is associated with a decrease noise, relative peak intensity (RIN) always lower than (REN). We also demonstrate drift power are directly linked high amount heat release du...

We report on the generation of 42 fs pulses at 1 μm in a completely fiber-integrated format, which are, to the best of our knowledge, the shortest from all-fiber-integrated Yb-doped fiber lasers to date. The ring fiber cavity incorporates anomalous-dispersion, solid-core photonic crystal fiber with low birefringence, which acts as a broadband, in-fiber Lyot filter to facilitate mode locking. Th...

The emission characteristics and the dynamics of laterally coupled diode lasers have been theoretically studied by many authors. However, little experimental work has been done on the locking and nonlinear dynamics of coupled lasers. An experimental characterization of the emission and dynamic characteristics is made by means of the spectrally resolved far field and of the relative intensity no...

Optical code division multiple access (OCDMA) is one of the most upcoming technologies for future multiple access techniques along with WDMA and OTDMA. Optical CDMA offers greater scalability than other optical multiplexing technique and it provides flexible quality of service and data access security. OCDMA requires increasing demand for high speed, large capacity communications in optical net...