We demonstrate a nonadiabatic microfiber sensor with taper diameter of few micrometers. The modal interference caused by the abrupt results in sinusoidal spectral response. wavelength shift arising because changes external refractive index is found to be significant, achieving maximum sensitivity 18681.82 nm/RIU. measured show good agreement theoretical predictions. high and simplicity offer potential for many real applications.

Polarization-insensitive widely tunable wavelength conversion has been demonstrated using four-wave mixing in a 64-m-long dispersion-flattened nonlinear photonic crystal fiber. A 3-dB range over 40 nm (1535-1575 nm) is obtained with flat efficiency of -16 dB and polarization sensitivity less than 0.3 dB. The measured power penalty 1 for 10-Gb/s converted nonreturn-to-zero signal at 10/sup -9/ bit-error rate.

An electron injected into a longitudinal magnetic field with some initial transverse motion will rotate at the cyclotron frequency in plane. If an RF electric field, which is polarized plane and oscillates frequency, present, cumulative energy interchange between occur. This principle of resonance interaction has been applied to construction backward-wave oscillator amplifier requires no slow-wave circuit. The elimination circuit provides several advantages, particularly if one interested...

We report the first experimental observation of four-wave mixing (FWM) in single-walled carbon nanotubes (SWCNTs) deposited on a Dshaped fiber. FWM-based tunable wavelength conversion 10 Gb/s nonreturn-to-zero signal is demonstrated using 5-centimeter-long CNT-deposited D-shaped A power penalty 4 dB obtained biterror- rate measurements.

We present an operation-switchable bidirectional ring-cavity pulsed fiber laser incorporating a carbon-nanotube-based saturable absorber and polarization-dependent four-port circulator. By manipulating the intra-cavity polarization state of light, two sets mode-locked pulses in terms fundamental repetition rate pulse width can be achieved separately from same cavity. In clockwise direction, generates output train with 600 fs 12.68 MHz. While counter-clockwise 480 16.46 Furthermore, cavity...

We demonstrate the generation of dark pulses from carbon nanotube (CNT) incorporated erbium-doped fiber ring lasers with net anomalous dispersion. A side-polished coated CNT layer by optically-driven deposition method is embedded into laser in order to enhance birefringence and nonlinearity cavity. The dual-wavelength domain-wall are obtained developed CNT-incorporated at a relatively low pump threshold 50.6 mW. Dark repeated fifth-order harmonic fundamental cavity frequency observed...

We experimentally investigate the stability of dispersion-managed mode-locked fiber lasers using carbon-nanotube-based saturable absorbers (SAs) with different modulation depths. An unstable operation region laser near-zero net cavity dispersion is observed, where produces random pulse burst rather than stable train. Through implementation high-contrast SAs in laser, found to be shrunk by ~31.3% when depth increases from 6.4% 12.5%. The numerical simulation consistent experimental observation.

We present an all-fiber bidirectional passively mode-locked soliton laser with a graphene-based saturable absorber for the first time to best of our knowledge.Our design includes four-port circulator introduce different sections cavity two counter-propagating pulses, so they have distinct output characteristics.Simultaneous operation is achieved by appropriately adjusting net birefringence and loss.In clockwise direction, emits ~750 fs pulses at 1561.6 nm, repetition rate 7.68 MHz.In counter...

For the first time, to best of our knowledge, in soliton regime, we demonstrate an L-band fiber laser mode-locked by all polarization-maintaining (all-PM) nonlinear polarization rotation (NPR). A numerical study suggests that lengthening NPR section boosts modulation depth and lowers saturation power artificial saturable absorber (SA). With longest date (21 m), emits 1.25-ps pulses at 1584.2 nm a 3.9-MHz repetition rate. Our provides promising seed source, exhibiting improved repeatability...

We demonstrate widely tunable wavelength conversion based on cross-phase modulation induced nonlinear polarization rotation in a carbon nanotubes (CNTs) deposited D-shaped fiber. A 5-centimeter-long CNT-deposited fiber is used as the medium for of 10 Gb/s non-return-to-zero signal. Wavelength converted signal over 40 nm obtained with around 2.5-dB power penalty bit-error-rate measurements.

We demonstrated a single-walled carbon-nanotube-deposited planar lightwave circuit (PLC) waveguide for four-wave-mixing (FWM)-based wavelength conversion. FWM is generated from the interaction between propagating light through PLC and deposited carbon nanotubes (CNTs) on overcladding-removed core of waveguide. The third-order nonlinearity CNTs originated interband transitions pi electrons causing nonlinear polarization similar to other highly organic optical materials. FWM-based tunable...

We investigated a nonadiabatically tapered microfiber refractive index sensor with an ultrashort waist length. Free spectral range (FSR) is one common issue in the interferometry-based sensors. Such sensors will not work properly once resonant wavelengths shift over cycle. It was found that temperature and pulling speed are crucial parameters to achieve desired tapering profile. By setting cooler fast speed, we successfully fabricated microfibers length of only 2.4 mm total 5.5 mm. The...

We present a pilot demonstration of an optical fiber based refractive index (RI) sensor involving the deposition graphene onto surface segment photonic crystal (PCF) in fiber-based Mach-Zehnder Interferometer (MZI). The fabrication process is relatively simple and only involves fusion splicing PCF between two single mode fibers. relies on cold transfer segment, without need for further physical or chemical treatment. overlay modified sensing scheme MZI RI sensor, allowing to overcome...

We demonstrate widely tunable wavelength conversion based on four-wave mixing using a dispersion-shifted bismuth-oxide photonic crystal fiber (Bi-PCF). A 1-meter-long Bi-PCF is used as the nonlinear medium for of 10 Gb/s non-return-to-zero (NRZ) signal. 3- dB working range converted signal over 35 nm obtained with around 1-dB power penalty in bit-error-rate measurements.

We report the observation of four-wave mixing (FWM) in single-walled carbon nanotubes (CNTs) deposited around a tapered fiber. The third-order nonlinearity CNTs is originated from interband transitions π-electrons causing nonlinear polarization similar to other highly-nonlinear organic optical materials. with suitable distributed tube diameter are optically fiber and FWM effect generated by launching probe pump light into device. FWM-based wavelength conversion further demonstrated using...

Widely tunable wavelength conversion has been demonstrated using broad-band orthogonal-pump four-wave mixing in a semiconductor optical amplifier placed at the intersection of two fiber ring lasers. The all-optical converter operates without any external pump source. A 3-dB conversion-range over 40 nm is obtained. measured power penalty 1.5 dB for 2.5-Gb/s converted signal 10/sup -9/ bit error rate.

All-optical return-to-zero (RZ) to non-return-to-zero (NRZ) format conversion has been demonstrated using cross-phase modulation in a dispersion-shifted fiber, which can principle work with different signal bit rates and does not require any external pulse duplicator. The output wavelength-converted is obtained from filtering of the broadened optical spectrum. A power penalty 2 dB at 10-9 bit-error-rate level 10 Gb/s experiment.

Flat super-continuum generation spanning over the whole telecommunication band using a passively modelocked fibre laser source at 1550 nm together with dispersion-flattened nonlinear photonic crystal is demonstrated. Since pulses propagate in normal dispersion regime of only, linear frequency chirp induced by self-phase modulation which leads to flat super-continuum. By launching compressed 170 fs an average power 10 mW into fibre, 185 less than 5 dB fluctuation obtained from all-fibre configuration.

All-optical wavelength conversion with multicasting has been demonstrated a single electroabsorption modulator based on cross-absorption modulation. It is shown that the input signal can simultaneously convert to six different wavelengths at 10 Gbit/s, and relation between power penalty number of operating channels investigated.

All-optical signal regeneration with wavelength multicasting has been demonstrated using cross-absorption modulation in a single electroabsorption modulator for the first time. We show that input can be simultaneously converted to 6 different wavelengths at 10 Gb/s regeneration. The output extinction ratio, linewidth, and pulse shape significant improvement. A negative power penalty of 2 dB is obtained 10-9 bit-error-rate level.

We present a scheme of fiber-connector-type carbon-nanotubebased saturable absorber (CNT-SA) with enhanced thermal damage threshold, in which the CNTs are deposited on fiber connector end ring pattern for evanescent-field interaction instead direct interaction.The threshold such CNT-SA is found to be increased by around 130% compared an evenly one.An all-fiber Fabry-Perot (FP) linear cavity passively mode-locked laser further constructed incorporating prepared CNT-SA, where optical power...