Showing papers by "Mohammed N. Islam published in 2007"
TL;DR: Simulation results obtained by solving the generalized nonlinear Schrödinger equation show that the long wavelength edge of the SC is primarily determined by the peak pump power in the ZBLAN fiber.
Abstract: Mid-infrared supercontinuum (SC) extending to ~4.0 mum is generated with 1.3 W time-averaged power, the highest power to our knowledge, in ZBLAN (ZrF(4)-BaF(2)-LaF(3)-AlF(3)-NaF...) fluoride fiber by using cladding-pumped fiber amplifiers and modulated laser diode pulses. We demonstrate the scalability of the SC average power by varying the pump pulse repetition rate while maintaining the similar peak power. Simulation results obtained by solving the generalized nonlinear Schrodinger equation show that the long wavelength edge of the SC is primarily determined by the peak pump power in the ZBLAN fiber.
91 citations
TL;DR: In this paper, a supercontinuum (SC) with a continuous spectrum from 0.8-3 mum is generated in a standard single-mode fiber followed by high-nonlinearity fiber.
Abstract: Supercontinuum (SC) with a continuous spectrum from ~0.8-3 mum is generated in a standard single-mode fiber followed by high-nonlinearity fiber. The SC is pumped by 2-ns laser diode (LD) pulses amplified in a multistage fiber amplifier, and the two octave spanning continuum is achieved by optimizing a two-stage process that separates pulse breakup and soliton formation from spectral broadening. We also demonstrate scalability of the average power in the continuum from 27 mW to 5.3 W by increasing the pulse repetition rate from 5 kHz to 1 MHz, while maintaining comparable peak power. We attribute the generated SC spectrum to the ensemble average of multiple solitons and the superposition of their corresponding spectra. The hypothesis is confirmed through simulation results obtained by solving the generalized nonlinear Schrodinger equation (NLSE). Similar SC spectra can also be obtained by using both femtosecond and nanosecond pump pulses. Furthermore, by tailoring the input pulse shape, we propose and simulate the generation of the entire SC spectrum in one single soliton under quasi-continuous-wave (CW) pulse pumping scheme.
65 citations
Patent•
26 Mar 2007
TL;DR: In this paper, a multiple-span optical communication system with a plurality of optical transmitters implementing a forward error correction (FEC) coding technique is presented, where the FEC encoded wavelength signals include a bit error rate of 10−09 or better after FEC decoding.
Abstract: An optical communication system is operable to communicate a plurality of wavelength signals at a bit rate of at least 9.5 gigabits per second over a multiple span communication link spanning at least 400 kilometers without optical regenerators. The plurality of wavelength signals include a bandwidth of more than 32 nanometers separated into at least 160 optical channels. The system includes a plurality of optical transmitters implementing a forward error correction (FEC) coding technique. The FEC encoded wavelength signals comprise a bit error rate of 10−09 or better after FEC decoding. The system also includes at least five (5) optical add/drop multiplexers (OADMs), each coupled to one or more spans of the multiple span communication link. The system further includes a plurality of amplifiers each coupled to one or more spans of the communication link, at least a majority of the amplifiers comprise a distributed Raman amplification stage.
12 citations
06 May 2007
TL;DR: In this paper, an all-fiber-integrated supercontinuum generation from ~0.9-3.6 mum with ~ 0.7 W time-averaged power was demonstrated using a telecommunication laser diode.
Abstract: All-fiber-integrated supercontinuum generation is demonstrated from ~0.9-3.6 mum with ~0.7 W time-averaged power by using a telecommunication laser diode, amplified by an erbium/ytterbium co-doped cladding-pumped fiber amplifier, and coupled into 35 m ZBLAN fluoride fiber.
1 citations