Adjustable EDFA gain equalization filter for DWDM channels based on a single LPG excited by flexural acoustic waves |
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| Authors: | Carlos AF Marques Roberson A Oliveira Alexandre AP Pohl Rogério N Nogueira |
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| Institution: | 1. Instituto de Telecomunicações, Pólo de Aveiro, 3810-193 Aveiro, Portugal;2. Volvo 3P-PD Advanced Engineering—Brazil, Av. Juscelino K. de Oliveira, 2600, 81.260-900, Curitiba, Paraná, Brazil;3. Federal University of Technology—Paraná, Av. Sete de Setembro, 3165, 80230-901, Curitiba, Paraná, Brazil;4. Nokia Siemens Networks Portugal S.A., 2720-093 Amadora, Portugal;1. School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, AZ 85287-5706, United States;2. Mathematics Faculty at the Technical University Darmstadt, Schlossgartenstr. 7, 64289 Darmstadt, Germany;3. Department of Electrical and Computer Engineering, University of Texas at El Paso, El Paso, TX, United States;1. Department of Photonics, National Cheng Kung University, Tainan 70101, Taiwan;2. Medical Devices and Opto-Electronics Equipment Department, Metal Industries Research and Development Centre, Kaohsiung 81160, Taiwan;3. Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan;1. School of AME, University of South Australia, Mawson Lakes, SA 5095, Australia;2. Mawson Institute and School of AME, University of South Australia, Mawson Lakes, SA 5095, Australia |
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| Abstract: | A fast adjustable gain equalization filter for dense wavelength division multiplexing (DWDM) system is reported. The method is based on a single long period fiber grating (LPG) which is excited by means of flexural acoustic waves. The equalization of a typical erbium doped fiber amplifier (EDFA) gain spectrum with a gain flatness of <0.3 dB over a 32 nm bandwidth is demonstrated. The filter adjustment is obtained by choosing different acoustic loads applied to the acousto-optic modulator, which presents a switching time of ～17 μs. A maximum power penalty of 0.84 dB, relatively to the back-to-back signal, was achieved. |
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