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We have investigated L-band dispersion-managed mode-locked (DMML) fiber laser incorporating carbon-nanotube saturable absorbers. For the first time, the DMML fiber laser operates at 1595 nm with the net cavity dispersion changing from −0.34 to −0.20 ps2, showing that the spectral bandwidth can be broadened by 39%.
For metro applications, direct detection offers the advantages of low cost and low complexity. Discrete multi-tone (DMT) is a promising format due to its high spectral efficiency, flexibility and tolerance to chromatic dispersion (CD). In this work, single-side-band-DMT (SSB-DMT) and tuneable electrical dispersion compensation double side-band-DMT (TEDC-DSB-DMT) are summarized and compared.
Recently, some fiber sensing applications by coating graphene oxide or reduce graphene oxide have been proposed. In this paper, a novel humidity sensor based on core-offset fiber Mach-Zehnder interferometer coated graphene oxide film has been carried out. Here, we use the chemical method to deal with the surface of the fiber first, and then coated graphene oxide on the surface of the optical fiber...
The comb filters consist of few mode fiber and standard single mode fiber suffer from low extinction radio. Replacing standard single mode fiber with small-mode-area fiber can better the balance excitation in few mode fiber, thus improve the extinction radio. A lab-made small-mode-area single mode fiber was utilized to a commercial few mode fiber and increase the extinction radio from 2.5dB to 6.5dB...
We propose a refractive index (RI) sensor based on a liquid-filled defect hollow core Bragg fiber (DHCBF) for high index sensing, in which a resonant wavelength resulted from the transverse resonant coupling effect between core modes and defect modes is utilized as the characteristic wavelength. The linearity and sensitivity strongly depend on structural parameters of defect layer. Accordingly, we...
A photonic-based phased array antenna (PAA) with ultra-fast beam scan is proposed and experimentally demonstrated using dispersion-based true time delay lines. The ultra-fast angle scan is realized using an ultra-fast wavelength-swept laser source which is constructed by a gated multi-wavelength laser (MWL) and a dispersion compensation fiber (DCF). The wavelength switching time is about several nanoseconds...
A new wavelength-swept fiber laser is proposed and successfully demonstrated based on two linear chirped fiber Bragg gratings (LC-FBGs) with perfect opposite dispersion response. It is based on intra-cavity pulse stretching and compression provided respectively by two chirped gratings. Experimental results demonstrate a wavelength-swept fiber laser that exhibits a sweep rate of about 3.48 MHz over...
A magnetic field sensor based on twisted single mode fiber and magnetic fluid (MF) is proposed and demonstrated. The sensor consists of two twisted points on a single mode fiber introduced by flame-heated and rotation treatment. Cladding modes are excited at the first twisted point and part of them are coupled back to the fiber core at the second twisted point, forming an inline Mach-Zehnder interferometer...
An all-fiber supercontinuum (SC) source with a repetition rate of over 100 MHz is experimentally demonstrated for the first time. The SC is generated by introducing the pulse output from a normal dispersion fiber laser into high nonlinearity fibers (HNLFs). An erbium-doped fiber amplifier (EDFA) and single segment single mode fiber (SMF) are used to compress the pulsewidth to increase pulse peak power...
In this paper, a pulse width compression scheme for optical time division multiplexing (OTDM) system based on supercontinuum (SC) is proposed. After injecting a high power narrow line-width pulse width laser into high nonlinear fiber (HNLF), the pulse width has been obviously narrowed. This demonstration suggests that the pulse width compression effect of SC could be used in free-space OTDM system.
By solving Schrodinger equation in standard Split-Step Fourier Transform (SSFT) method, the NRZ, 33%RZ, 50%RZ, CSRZ, DPSK, 33%RZ-DPSK, 50%RZ-DPSK and CSRZ-DPSK were simulated in 40G bit/s single channel transmission system with the influence of dispersion, nonlinearity and polarization mode dispersion. The simulation results show that CSRZ has better performance than the other modulation formats in...
A detailed fiber design was presented for the first time for three-stage non-integer order soliton compression at the wavelength of 1060 nm. A compression factor of 173.52 was realized, and the remained pedestal is only 32.21%.
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