Showing papers in "Optical Fiber Technology in 2008"

TL;DR: In this article, the spectral gain filtering was identified as a mechanism of multiple pulse formation in a fiber laser passively mode-locked through nonlinear polarization rotation operating in the normal dispersion regime.

TL;DR: In this paper, the SBS threshold is evaluated by considering a 4% level change in the reflected power against the input power in terms of harmonization with the carrier-to-noise ratio (CNR).

TL;DR: In this article, the use of in-line NOLMs as a general technique for all-optical passive 2R regeneration of RZ on-off keyed signals in both high-speed, ultralong-distance transmission systems and terrestrial photonic networks is reviewed.

TL;DR: In this article, the authors present the development and laboratory validation of in-line multiplexing for a low-coherence interferometric strain sensor suitable for industrial deployment and application to civil structures.

TL;DR: In this paper, a code family suitable for passive optical networks based on optical code division multiple access (OCDMA) is presented. But the corresponding encoding/decoding devices require less fiber ribbons than that of the spatial/spectral systems proposed previously and the code cardinality is maintained.

TL;DR: In this paper, a compact helicoidal long-period fiber grating (HLPFG) was fabricated by twisting a single mode fiber with CO2 laser beam exposure and its characteristic was experimentally investigated.

TL;DR: In this paper, the authors present a review of fiber access architectures and key technologies on optical fiber and cable for supporting flexible access network, taking minimization of total cost (CAPEX and OPEX) into consideration.

TL;DR: In this paper, the authors demonstrate theoretically that discrete Raman amplifiers operating in the O-band region (1260-1360 nm) are more efficient than in any other band if we consider the fiber attenuation.

TL;DR: In this paper, a broadening factor of the Brillouin spectrum width was used to predict the location and progression sequence of buckling patterns, prior their visual detection in the laboratory.

TL;DR: In this paper, a numerical method based on the fourth-order Runge-Kutta formula is developed to solve the coupled equations directly, which does not need to be treated as a superposition of a set of uniform grating with sinusoidal index modulation through the Fourier transform.

TL;DR: In this article, a simple method for all-optical measurements of background, amplitude, and timing jitters of ultra high speed pulse trains or PRBS sequences using the jitter dependence of the intercorrelation-peak shape is presented.

TL;DR: The proposed one wavelength assignment strategy for optical networks which assigns the wavelength according to minimum connection count is much better than existing strategy in terms of number of searches required to find a wavelength for establishing the connection and hence connection establishment time reduces.

TL;DR: In this article, short length, air-clad, multimode fibres were fabricated using high concentration Yb and Yb-Er-doped phosphotellurite glass.

TL;DR: An experimental demonstration of security-improved optical code-division-multiplexed-access (CDMA) scheme based on spectrally encoded incoherent broadband light source with bipolar coding based on amplified spontaneous emission noise of erbium-doped fiber amplifier.

TL;DR: In this article, a distributed Raman fiber amplification is proposed and experimentally demonstrated to support long reach passive optical network (PON) links and an 80 km, bidirectional, single fiber link is demonstrated using both standard intensity optical modulators at 10 Gb/s and up to 7.5 Gb /s using novel reflective semiconductor optical amplifier electro-absorption modulator.

TL;DR: In this article, the effect of directly modulated laser chirp can be compensated by a negative dispersion fiber, but this only occurs in a specific range of DML output power.

TL;DR: In this article, the spectral densification and shifting effects of periodic phase shifts are investigated and it is shown that desired amount of channel multiplying can be provided by using appropriate value of densification factor.

TL;DR: In this paper, a nonchirped phase mask is used to fabricate chirped fiber Bragg gratings using a continuous stretching and continuous UV beam scanning, which ensures phase matching between periods along the grating.

TL;DR: In this article, the error probability for bidirectional transmission systems using FSK or DPSK format for downstream and OOK format for upstream has been examined in the optical line terminal (OLT) and optical network unit (ONU).

TL;DR: In this paper, a novel all-optical regeneration scheme based on fiber-optic parametric amplification operating under the strong pump depletion regime is numerically demonstrated and investigated, and an extended numerical analysis accompanied with theoretical support provides the power transfer characteristics and the phase analysis of the proposed regenerator under various operating conditions.

TL;DR: In this paper, the authors describe the transmission characteristics of hole assisted fiber (HAF) which has a conventional germanium-doped core surrounded by several air holes and report the design principle of the HAF in terms of both bending loss and mode-field diameter characteristics.

TL;DR: The nonlinear optical transmission of an optical ring resonator (ORR) operating in the soliton regime is investigated numerically in this paper, and the average compression factor of the switched pulses is analyzed.

TL;DR: In this article, a numerical method for the inverse extraction of the multiple physical parameters of phase-shifted fiber Bragg gratings (FBGs) is presented. And the proposed method has the advantages of simplicity, low cost and a nondestructive nature.

TL;DR: In this paper, the authors presented the long-term measurements of polarization mode dispersion (PMD) on aerial and buried optical fiber cables mixing paths and compared the results with theoretical and real standard deviations to get some conclusions about accuracy.

TL;DR: In this paper, a detailed analysis in terms of computational and experimental results of a high power erbium doped fiber amplifier using the bidirectional pumping scheme is presented, where the differences between the signal evolution are discussed for unidirectionally and bidirectionally pumped amplifier for a single channel CW input.

TL;DR: A novel design of an optical amplifier with high gain elaborated from erbium-doped fiber (EDF) for the amplification of low power pulses from laser diodes, which allows the investigation of nonlinear processes in optical fibers.

TL;DR: In this article, the gain dynamics of an all-optical gain-clamped multichannel erbium-doped fiber amplifier (EDFA) with an inhomogeneous active medium in the presence of ion pairs is modeled.

TL;DR: In this paper, a four-wavelength CATV/radio-on-fiber (ROF) transport system based on one distributed feedback laser diode (DFB LD) with main and side modes injection-locked (MSMIL) is proposed and demonstrated.

TL;DR: In this paper, the authors theoretically and experimentally investigated an effect of cabling on polarization mode dispersion (PMD) in ribbon fibers helically stranded in optical fiber ribbon cables aimed at designing low PMD ribbon cables.

TL;DR: In this paper, the transient microbending loss and refractive index changes in a single-coated optical fiber subjected to thermal loading with stress-dependent interlayer thermal resistance are investigated.