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21 August 2013Two methods for measuring optical return loss of optical devices in laser propagation system
In order to ensure the reliable performance of a high-speed optical fiber communication system, it is vital that all
optical components are characterized, such as connectors, couplers, switches and detectors. Among the component
characteristics, backreflection in the laser propagation system will cause high bit error rate resulting from multipath
interference, degrade optical signal-to-noise ratio (OSNR) and induce transmitter instability. The measurement of optical
return loss (ORL), which quantifies this backreflection characteristic, is necessary. Optical continuous wave
reflectometer (OCWR) and optical reflection discrimination (ORD) are widely used to measure ORL of optical devices
in laser propagation system. These two techniques have different application effect, so to select suited technique to
measure ORL is very important. This paper will describe their measurement principle and application issue of these two
techniques. By comparison, it can be found that OCWR technique has the advantage of measurement accuracy, but ORD
technique has the advantage of simplicity of implementation due to no mandrel wrap and increased dynamic range. As
for the laser propagation system, ORL of entire optical link should be measured using OCWR technique to ensure good
status; otherwise, ORL of individual optical device should be measured quickly using ORD technique. Conclusions of
this paper can be guidance for selecting proper optical return loss meter in the laser propagation system.
Qiang Sun,Ji-song Yan, andZhi-hui Zhang
"Two methods for measuring optical return loss of optical devices in laser propagation system", Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 890611 (21 August 2013); https://doi.org/10.1117/12.2033060
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Qiang Sun, Ji-song Yan, Zhi-hui Zhang, "Two methods for measuring optical return loss of optical devices in laser propagation system," Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 890611 (21 August 2013); https://doi.org/10.1117/12.2033060