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We review and discuss the recent advances in high-power fiber lasers with particular attention to a multitude of laser configurations, including continuous-wave and pulsed regimes. In addition, we also discuss novel fiber technology for various specific applications.
Rare-earth-doped fiber lasers have played an immense role in pioneering and realizing high optical power regime. Among these rare-earth-doped fiber lasers, Ytterbium-doped (Yb) silicate fibers demonstrate exceptional performance especially in high power regime. Phosphosilicate based Yb-doped fiber offers great advantages such as negligible photo-darkening, relatively longer lifetime than aluminosilicate...
We present the direct amplification of a wavelength-tunable picosecond fiber laser operating in the 1.5 μm region by core-pumping a large mode area erbium-doped fiber. The system can deliver peak powers and pulse energies of ∼ 11 kW and 106 nJ, respectively.
We numerically investigated the possibility of a phase sensitive amplifier based on a semiconductor optical amplifier. Suppression of phase variation was confirmed in the dual-pump degenerate four wave mixing method.
We propose an optically-amplified transmission system using highly-efficient remotely-pumped multi-core EDFAs and a novel hybrid wavelength-/space-division multiplexing scheme. Basic characteristics of the pumping efficiency of the system are experimentally clarified.
We demonstrate a band separated, bidirectional amplifier based on a bismuth-based erbium-doped fiber for use in long-reach hybrid WDM-TDM PONs. It is experimentally shown that the amplifier based on a single gain medium can cover both L-band downstream and C-band upstream channels at the same time.
We propose OSNR monitoring for PM-QPSK systems in presence of fiber nonlinearities by characterizing the nonlinearity-induced amplitude noise correlation among neighboring symbols and incorporating it into a typical OSNR estimator based on received signal distributions.
Spatial multiplexing (SDM) offers the possibility of multiplying the capacity of a single fiber and enabling a continuation of the era of bandwidth abundance. But will this promise be fulfilled? While the technical prospects for SDM seem bright, success will require the realization of economic benefits.
The requirements of amplifiers for next-generation ROADM-based optical transport networks are identified and discussed. Raman/EDFA are expected to be used in place of traditional EDFA, and new classes of amplifiers will be used inside the transport nodes.
A phase-sensitive amplifier followed by a phase-insensitive one can have a noise figure well below 3dB. This can be used for reducing the detrimental nonlinear effects occurring in fiber optical parametric amplifiers for optical communication.
The Raman pumps in a GPON reach extender are optimized via numerical investigation employing experimentally measured fiber parameters. With an optimal 1414-nm pump wavelength for the 1490-nm signal, pump powers are reduced by 20%.
We report on the use of an ultra-narrow (∼0.01 nm) spectrum-sliced incoherent light source for transmission of a 10-Gb/s non-return-to-zero signal over 20-km standard single mode fiber or 0.2-nm-bandwidth optical filter.
We demonstrate parallel compensation of optical fiber nonlinearity for transmission of 100 GHz spaced 3×40 Gb/s RZ-DPSK signals by all-optical nonlinear pre-distortion and phase-conjugation embedded in the transmitter. The Q-factor is improved by 1.4-2.6 dB for all channels.
The first bismuth-doped superfluorescent fiber source operating at 1.44-μm was developed. At pump power of 200 mW and pump wavelength of 1310 nm, its output signal reaches 57 mW with spectrum width of 25 nm.
A study regarding the performance comparison of three different types of long distance fiber Bragg grating (FBG) sensors based on bidirectional Raman and erbium-doped fiber (EDF) amplification has been carried out to determine the most power-efficient and accurate configuration. The results of our experimentation showed that the sensor system with the EDF located prior to the Raman amplification section...
The internet brings you data from around the world almost instantly. This information might come from New York, London, Mumbai, Tokyo, Sydney, Beijing, Rio de Janeiro, or Seoul and arrives in your continent not from satellite but from cables that sit on the bottom of the ocean. The earth's continents are connected with a web of undersea fber-optic cables that join the world's major population centers...
A ring-down sensor with Erbium Doped Fiber Amplifier gain-clamping technology is reported with analysis and experiments. Theoretical analysis of gain-clamped EDFA and the system was derived, and later experiments have high sensitivity and low errors.
The CDFs employing drawing-tower integrated non-silica powder-in-tube with redrawing technique is proposed. A reduction of transmission loss of 0.27 dB/cm at 1550-nm and a core non-circularity of less than 3% for the CDFs are achieved.
We propose and demonstrate a multi-ring architecture for the survivable WDM PON. This architecture has an excellent scalability and the protection can be achieved by using a small amount of additional protection fibers.
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