We present novel carbon-nanotube-based saturable absorbers. Using the low-temperature alcohol catalytic chemical-vapor deposition method, high-quality single-walled carbon nanotubes (SWNTs) were directly synthesized on quartz substrates and fiber ends. We successfully applied the SWNTs to mode lock a fiber laser producing subpicosecond pulses at a 50-MHz repetition rate.

BACKGROUND The current food pyramid guidelines have been criticized because of their complexity and the knowledge required for users to understand the recommendations. Simplification of a dietary message to focus on a single key aspect of dietary quality, e.g., fiber intake, may make the message much easier to comprehend and adhere, such that respondents can achieve greater weight loss, better ...

We present a high power, single-frequency fiber amplifier based on master oscillator power amplification (MOPA) chains in all-fiber configuration. A 1.5 meter long highly doped Yb fiber with absorption coefficient as high as 16 dB/m at the 975 nm wavelength is used for the main power amplifier, no special assistant stimulated Brillouin scattering (SBS) suppression approach is employed. The maxi...

OCDMA is a technique by which large number of users can access the network simultaneously i.e. at the same time. As the number of user increases, the dispersion and interference begin to rise, which led to high bit error rate and low quality of service of the system. Due to high bit error rate, the transmission of data becomes unsecure and error prone. Therefore to remove or minimize the disper...

A novel arc calibration method has been developed for fusion splicing optical fibers with a large variety of glass diameters. This method heats the fiber with multiple short arcs and measures the amount of meltback at the corner of the fiber-ends. The fiber corner melting speed is found to be proportional to the fiber temperature. By varying the arc power of the multiple arcs, we can determine ...

A mechanical quality factor of 1.1× 107 was obtained for the 199Hz bending vibrational mode in a monocrystalline sapphire fiber at 6K. Consequently, we confirm that pendulum thermal noise of cryogenic mirrors used for gravitational wave detectors can be reduced by the sapphire fiber suspension.

Cotton fiber is an important commodity throughout the world. Fiber property determines fiber quality and commercial values. Previous studies showed that silencing phytochrome A1 gene (PHYA1) by RNA interference in Upland cotton (Gossypium hirsutum L. cv. Coker 312) had generated PHYA1 RNAi lines with simultaneous improvements in fiber quality (longer, stronger and finer fiber) and other key agr...

Information on forage quality could help rangeland managers to select suitable grazing method to achieve higher animal performance without damage to vegetation. The aim of this study was to determine and compare the forage quality of S. yazdiana and S. tomentosa, which are the most important species of saline rangelands in Ardakan in Yazd province, Iran. These two species are grazed by goats an...

the effect of different salinity levels (1.7, 5, 10, 15 and 20 ds.m-1) on yield and forage quality of two millet cultivars (nutrifeed and bastan) was investigated in this experiment. a factorial test based on randomized complete block design with three replications was conducted during 2010-11 growing season. the results showed that with increase in salinity, dry matter yield decreased. the hig...