Reflections and multiple Rayleigh backscattering in WDM single-fiber loopback access networks
| Autor: | Klaus-Dieter Langer, Josep Prat, C. Arellano |
|---|---|
| Přispěvatelé: | Publica |
| Rok vydání: | 2009 |
| Předmět: |
Optical fiber
Transmission loss optical noise 02 engineering and technology 01 natural sciences Passive optical network optical fibre losses law.invention 010309 optics 020210 optoelectronics & photonics Optics optical crosstalk law Wavelength-division multiplexing 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Optical filter wavelength division multiplexing rayleigh scattering Physics Optical amplifier semiconductor optical amplifier business.industry Electro-optic modulator Atomic and Molecular Physics and Optics Return loss optical fibre subscriber loops business superradiance |
| Zdroj: | Journal of Lightwave Technology |
| ISSN: | 0733-8724 |
| DOI: | 10.1109/JLT.2008.929411 |
| Popis: | The optical gain of reflective optical network units (ONUs) may produce a critical amplifying feedback on the single-fiber transmission impairments. In this paper, its influence on the passive optical networks transmission with reflective-ONU is theoretically analyzed and experimentally confirmed. Analytical expressions for the optical crosstalk-to-signal ratio and the Q-parameter in presence of Rayleigh backscattering, reflection interferences and ASE noise are given. As a resulting design guideline, the ONU gain should be adjusted to about 3 dB below the total link loss; in addition, component return loss at the drop section must be higher than 30 dB. Experimental results with two basic types of reflective-ONUs, namely a loop structure formed by a Mach-Zehnder modulator and an optical amplifier, and another one employing a reflective-SOA, are in agreement with the theoretical approach. |
| Databáze: | OpenAIRE |
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