Metamaterial perfect absorber (MPA) promises many applications due to its capability of complete suppression of transmission or/and reflection. The complete dissipation of the incident electromagnetic energy by the absorptive meta-atoms makes it a unique candidate in many photonic and optoelectronic devices. An ultrathin metamaterial absorber that consists of a periodic nanostrip metal on top of a planar dielectric slab backed by a conducting metal plate is presented. The spectral absorptivity of MPA is investigated by the finite difference time domain method from visible to near-infrared. The various geometrical and material parameters of MPA are optimized for maximum absorption.
The operation of a semiconductor colliding pulse mode locked (CPM) laser has been analyzed using the time domain approach. In this approach the re-circulating transmission of a pulse through the various elements of the optical cavity such as the gain medium, the waveguide, and, the saturable absorber is carried out with the condition that the pulse must remain unchanged after one round trip. The pulse width of a CPM laser as a function of gain section current, saturable absorber current, and, modulation frequency has been measured. The laser is ~ 8.5 mm long and operates at a pulse repetition rate of ~ 10 GHz. The measurements and modeling results agree well. Both measured and calculated minimum pulse width is ~ 1 ps.
The variational method is a useful tool that can be used for design and optimization of dispersion-managed communication systems. Using this powerful tool, we evaluate the characteristics of a carrier signal for certain system parameters and describe several features of a dispersion-managed soliton.
Optical Time Division Multiplexing (OTDM) is one of the important techniques by which data transmission capacity (aggregate bit rates) can be increased enormously. In this work, we demonstrate an 80 Gb/s time division multiplexing and demultiplexing experiment. By gain switching a DFB laser with 10 GHz RF signal we produced approximately 7 ps FWHM pulses. By using TDM technique we obtained 80 GHz signal. The demultiplexing of this TDM signal is carried out using two cascaded LiNbO3 Mach-Zehnder modulators.
The fabrication and performance of a colliding pulse mode locked laser with an intracavity saturable absorber is described. The laser has a threshold current of 65 mA and differential efficiency of 0.04 mW/mA when coupled into a single mode fiber. Mode locked pulses with approximately 1 ps pulse width at approximately 10 GHz has been obtained.
Using Cyclic Transparent Optical Polymer (CYTOP), a perfluorinated graded index fiber, different transmission characteristics were investigated. Graded index perfluorinated fibers can support multi-Gb/s date rates form 0.83 um to 1.3 um. High bit rates can be obtained over 0.5 um wavelength range where optical transmitter and receivers technologies are already matured. A distributed feedback laser source at 1.3 um and a low cost InGaAs detector had been used in an error free transmission for both modulated multichannel transmission and directly modulated digital transmission for both modulated multichannel transmission and directly modulated digital transmission at 2 Gb/s. Two data channels at 145 Mb/s are mixed using binary phase shift keying BPSK modulation technique index of 5.3 percent. Also, the dispersion power penalty of the CYTOP fiber was measured and found to be less than 1 dB suggesting that the fiber induced distortion is small.
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