Highly multiplexed graded‐index polymer waveguide hologram for near‐infrared eight‐channel wavelength division demultiplexing

1991 ◽  
Vol 59 (10) ◽  
pp. 1144-1146 ◽  
Author(s):  
Ray T. Chen ◽  
Huey Lu ◽  
Daniel Robinson ◽  
Tomasz Jannson
Keyword(s):  
Near Infrared ◽  
Wavelength Division ◽  
Polymer Waveguide ◽  
Graded Index ◽  
Channel Wavelength ◽  
Waveguide Hologram

Five-channel polymer waveguide wavelength division demultiplexer for the near infrared

1991 ◽  
Vol 3 (1) ◽  
pp. 36-38 ◽  
Author(s):  
M.R. Wang ◽  
G.J. Sonek ◽  
R.T. Chen ◽  
T. Jannson
Keyword(s):  
Near Infrared ◽  
Wavelength Division ◽  
Polymer Waveguide

A four-channel ridge wave-guide quantum well wavelength division demultiplexing detector and its optimization

1992 ◽  
Vol 70 (10-11) ◽  
pp. 931-936
Author(s):  
F. Ye ◽  
D. Moss ◽  
J. G. Simmons ◽  
P. E. Jessop ◽  
D. Landheer ◽  
...  
Keyword(s):  
Quantum Well ◽  
Stark Effect ◽  
Transverse Magnetic ◽  
Electric Polarization ◽  
Wave Guide ◽  
Single Quantum Well ◽  
Wavelength Division ◽  
Graded Index ◽  
Channel Wavelength ◽  
Better Than

We present a four-channel wavelength division demultiplexing detector using the principle of quantum confined Stark effect. This device is based on a ridge waveguide GaAs–AlGaAs single quantum well graded index separate confinement heterostructure. Four detectors are fabricated sequentially along the wave guide and their band gaps are tuned to progressively smaller values by applying progressively larger reverse bias voltages. Thus each detector responds preferably to one of the four input wavelengths. For transverse electric polarization, better than −10 dB crosstalk was achieved with a 14 nm wavelength separation. When operated as a three-channel device, better than −15 dB crosstalk was achieved with a 18 nm wavelength separation. For transverse magnetic polarization, better than −10 dB crosstalk was achieved with a 16 nm wavelength separation. We also present a theoretical study that leads to the optimization of the device.

Design of EDFA based 16 channel WDM system using counter directional high pump power

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Md. Asraful Sekh ◽  
Mijanur Rahim ◽  
Anjumanara Begam
Keyword(s):  
Pump Power ◽  
Wavelength Division Multiplexing ◽  
Input Power ◽  
Low Noise ◽  
Fiber Amplifiers ◽  
Wavelength Division ◽  
High Pump Power ◽  
Erbium Doped ◽  
High Pump ◽  
Channel Wavelength

Abstract In this paper, design of erbium-doped fiber amplifiers (EDFA) based 16 channel wavelength-division multiplexing (WDM) system for different pump powers and input signal levels using counter propagating pumping scheme is reported. Wavelength range between 1548 and 1560 nm in C-band with channel spacing of 0.75 nm at a bit rate of 10 Gbps are used. Input power given to all the channels is taken between −20 and −35 dBm with 3 dBm variation. Pump power levels between 100 and 500 mW at 980 nm wavelength are used. Low gain flatness with high gains and low noise figures are achieved with the proposed scheme.

Demonstration of Multi Pump Wide Gain Raman Amplifiers for Maximization of Repeaters Distance in Optical Communication Systems

2015 ◽  
Vol 4 (1) ◽  
pp. 38
Author(s):  
Ahmed Zaki Rashed
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Communication ◽  
Communication Systems ◽  
Gain Coefficient ◽  
Gain Medium ◽  
Wavelength Division ◽  
Raman Amplifiers ◽  
Optical Communication Systems ◽  
Multiple Wavelengths ◽  
Channel Wavelength

<p>Fiber Raman amplifiers in ultra wide wavelength division multiplexing (UW-WDM) systems have recently received much more attention because of their greatly extended bandwidth and distributed amplification with the installed fiber as gain medium. It has been shown that the bandwidth of the amplifier can be further increased and gain spectrum can be tailored by using pumping with multiple wavelengths. Wide gain of the amplifier is considered where two sets of pumps N<sub>R</sub> {5,10} are investigated. The gain coefficient is cast under polynomial forms. The pumping wavelength l<sub>R</sub> is over the range 1.40 £ l<sub>R</sub>, mm £ 1.44 and the channel wavelength l<sub>s</sub> is over the range 1.45 £ l<sub>s</sub>, mm £ 1.65. Two multiplexing techniques are processed in long-haul transmission cables where number of channels is up to 10000 in ultra-wide wavelength division multiplexing (UW-WDM) with number of links up to 480. The problem is investigated over wide ranges of affecting sets of parameters.</p>

Multi-Layer Graded-Index Planar Structure for Coarse WDM Demultiplexing

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Haythem Bany Salameh ◽  
Hazem Khrais
Keyword(s):  
Refractive Index ◽  
Incident Angle ◽  
Design Parameters ◽  
Material Dispersion ◽  
Wavelength Division ◽  
Graded Index ◽  
Spatial Shift ◽  
Number Of Layers ◽  
Refractive Index Difference ◽  
Device Size

AbstractIn this paper, we develop a novel demultiplexer design for Coarse Wavelength Division Multiplexer (CWDM). The device consists of multi-layer inhomogeneous semi-conductor material, where the refractive index of each layer is graded according to a predefined profile. The proposed design exploits the ray’s spatial shift that results from the material dispersion as different wavelengths propagate through the different layers of the device. Our design forces the multiplexed light to refract after propagation for short distance within the device leading to smaller device size while providing the needed spatial shift between the ray’s of the adjacent multiplexed wavelengths. The proposed structure can be easily implemented using the well-established technology utilized in fabricating existing graded-index fibers. The impacts of the various design parameters (such as the incident angle, number of layers, the layer thickness, the spacing between adjacent wavelengths, the refractive index difference) on the amount of achieved spatial shift between the adjacent wavelengths and the size of the device are investigated. Compared to previous proposed techniques, our device can be easily fabricated to provide higher spatial shift while reducing the device size with by controlling the different design parameters.

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