Impact of the Input Pulse Width on the Performance of a 10 Gb/s SOA-DI Wavelength Converter

A scheme that can be used to generate UWB doublet and triplet signals simultaneously based on SOA-SGS and SOA-XGM is carried up, then the theory is analyzed. Simulated through Optisystem9.0, a UWB doublet signal whose central frequency is 6GHz and relative bandwidth is 143% and a triplet signal whose central frequency is 8GHz and relative bandwidth is 120% are generated. Then, the impacts that input pulse width and light source power impose on the results is analyzed.

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Numerical investigation on the femtosecond pulse propagation and free carriers’ evolution in silicon-on-insulator waveguides

Modern Physics Letters B ◽

10.1142/s0217984916502997 ◽

2016 ◽

Vol 30 (21) ◽

pp. 1650299

Author(s):

Jin Wen ◽

Chengju Ma ◽

Wei Fan ◽

Haiwei Fu ◽

Zhenan Jia

Keyword(s):

Pulse Width ◽

Peak Power ◽

Femtosecond Pulse ◽

Pulse Propagation ◽

Input Pulse ◽

Leading Edge ◽

Silicon On Insulator ◽

Refractive Index Modulation ◽

Free Carriers ◽

Femtosecond Regime

The femtosecond pulse propagation and free carriers’ evolution in the silicon-on-insulator (SOI) waveguides have been numerically investigated considering the carrier’s lifetime and the pulse width of the input pulse at 1.5 [Formula: see text]m regime. Numerical results show that the free carriers’ density profile becomes gentle between the leading edge and trailing edge of the pulse in time domain due to the decreasing of the pulse intensity caused by the nonlinear absorption, which becomes more remarkable when the pulse width expands. It can be found that lifetime ranging from 5 ns to 100 ns does not affect the free carriers’ evolution clearly in femtosecond regime. In addition, the refractive index modulation can be appeared in the process of pulse propagation and free carriers evolution with lower peak power of 200 W. This research can supply some contribution to the insight of free carriers evolution in SOI waveguides.

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First Demonstration of 2.1 kW Output Power at 425 MHz Using 4H-SiC RF Power BJTs

Materials Science Forum ◽

10.4028/www.scientific.net/msf.527-529.1413 ◽

2006 ◽

Vol 527-529 ◽

pp. 1413-1416

Author(s):

Anant K. Agarwal ◽

Fatima Husna ◽

Jeremy Haley ◽

Howard Bartlow ◽

Bill McCalpin ◽

...

Keyword(s):

Output Power ◽

Duty Cycle ◽

Pulse Width ◽

Supply Voltage ◽

Input Pulse ◽

Current Gain ◽

Power Added Efficiency ◽

Peak Output Power ◽

Collector Efficiency ◽

Dc Current

For the first time, 4H-SiC RF bipolar junction transistors have been used to produce an output power in excess of 2.1 kW at 425 MHz. For an input pulse width of 2 μs and 1% duty cycle, the power gain at peak output power is 6.3 dB with the collector efficiency and power added efficiency [PAE] being 45% and 35%, respectively, at a collector supply voltage of 75 V in a class C configuration. The package consists of 24 cells (2 chips) having an emitter periphery of approximately 1 inch per cell. Each cell produced a DC current gain (β) of 15 and a common emitter breakdown voltage (BVCEO) greater than 250 V. A peak output power of 87 W per cell was obtained at 425 MHz, as compared to the earlier report of 50 W per cell [1, 2] by using a shorter pulse width and duty cycle.

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Optimization of the pulse width and injection time in a double-pass laser amplifier

High Power Laser Science and Engineering ◽

10.1017/hpl.2018.55 ◽

2018 ◽

Vol 6 ◽

Cited By ~ 1

Author(s):

Daewoong Park ◽

Jihoon Jeong ◽

Tae Jun Yu

Keyword(s):

Pulse Width ◽

Extraction Efficiency ◽

Input Pulse ◽

Pump Energy ◽

Output Pulse ◽

Gain Medium ◽

Injection Time ◽

Laser Amplifier ◽

Double Pass ◽

Maximum Value

We have optimized the input pulse width and injection time to achieve the highest possible output pulse energy in a double-pass laser amplifier using two Nd:YAG rods. For this purpose, we have extended the Frantz–Nodvik equation by simultaneously including both spontaneous emission and pump energy variation. The effective pump energy of the flash lamp was 8.84 J for each gain medium. The energy of 1 J could be amplified to an output energy of 12.17 J with the maximum achieved extraction efficiency of 63.18% when an input pulse having a pulse width of 168 $\unicode[STIX]{x03BC}$s is sent 10 $\unicode[STIX]{x03BC}$s after the absorbed pump energy becomes the maximum value.

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DESIGN OF AN ULTRA-FAST ALL-OPTICAL DARK SOLITON SWITCH IN A THREE-CORE NONLINEAR DIRECTIONAL COUPLER (TNLDC) MADE OF CHALCOGENIDE GLASSES

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863512500385 ◽

2012 ◽

Vol 21 (03) ◽

pp. 1250038 ◽

Cited By ~ 3

Author(s):

MOHSEN HATAMI ◽

ROYA ATTARZADEH ◽

ABDOLRASOUL GHARAATI

Keyword(s):

Pulse Width ◽

Chalcogenide Glasses ◽

Directional Coupler ◽

Group Velocity Dispersion ◽

Input Pulse ◽

Power Input ◽

Dark Soliton ◽

Photon Absorption ◽

Nonlinear Directional Coupler ◽

Soliton Switching

We designed and simulated a three-core nonlinear directional coupler (TNLDC) dark soliton switch. We have optimized the optical properties of chalcogenide glasses such as their high nonlinear refractive index and negative group velocity dispersion and designed a switch having a length of 7 cm and an ultra-fast pulse width of 10 fs with a 100 W power input pulse. The switching characteristic shows that complete switching is possible for different ranges of lengths and pulse widths, and by using the result of the simulation we find a relation between the length and the pulse width with respect to the necessary power for complete dark soliton switching. Also the effect of two photon absorption (2PA) on dark soliton switching was studied and it was shown that 2PA puts some limitations on the switching action but, because of the low value of the 2PA figure of merit for chalcogenide glasses, it did not have any considerable effect on dark soliton switching.

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The 1-Bit Instrument

Journal of Sound and Music in Games ◽

10.1525/jsmg.2020.1.1.44 ◽

2020 ◽

Vol 1 (1) ◽

pp. 44-74

Author(s):

Blake Troise

Keyword(s):

Pulse Width ◽

Pulse Width Modulation ◽

Interleaving Techniques ◽

Sonic Environment

The 1-bit sonic environment (perhaps most famously musically employed on the ZX Spectrum) is defined by extreme limitation. Yet, belying these restrictions, there is a surprisingly expressive instrumental versatility. This article explores the theory behind the primary, idiosyncratically 1-bit techniques available to the composer-programmer, those that are essential when designing “instruments” in 1-bit environments. These techniques include pulse width modulation for timbral manipulation and means of generating virtual polyphony in software, such as the pin pulse and pulse interleaving techniques. These methodologies are considered in respect to their compositional implications and instrumental applications.

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