研究目的
To quantify the impact of the variability of the fibre coupling at the injection and the detection ends on transmission parameters of a POF link.
研究成果
The input spatial distribution has an impact in the injected power and in the frequency response. The detector introduces new sources of variability that usually enhance the differences at the input and increase the standard deviation of the transmission parameters. Although detected power has a high standard deviation attributable both to the light source and the detector, total power loss however is practically independent on launching distribution. Standard deviation in the frequency response is reduced with increased fibre length.
研究不足
The variability in fibre model parameters has to be assessed and then, introduced in the propagation models to get a more realistic picture of the complete system. Some effects not included in the proposed model tend to increase the standard deviation such as fibre and end face roughness and tilt, detector dark noise, etc.
1：Experimental Design and Method Selection:
Analyzed two different light sources using experimental measurements to model their spatial characteristics. Applied a matrix model to simulate light propagation through POFs of several lengths. Introduced a model for the detector based on the calculation of the radiated power distribution.
2：Sample Selection and Data Sources:
Used a commercial red laser diode (LD) and a VCSEL from a commercial POF transceiver.
3：List of Experimental Equipment and Materials:
DL-5147-042 from SANYO, LDM9T laser mount with TEC and controller from Thorlabs, POF commercial transceiver EDL1000T-EVB from Firecomms, GH4002 from Mitsubishi, cutter B0605005, jacket stripper from Micro-Strip?, DET10A from Thorlabs, ZKL-1R5 from Mini Circuits.
4：Experimental Procedures and Operational Workflow:
Measured the FFPs for
5：5-metre fibre segments changing the input end of the segment for each measurement. Simulated a fibre link with distances of 10, 20 and 40 metres. Data Analysis Methods:
Used the propagation matrix model for the fibre to calculate the standard deviations of power loss and frequency response.
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LDM9T
LDM9T
Thorlabs
Laser mount with TEC and controller used to drive the LD.
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DET10A
DET10A
Thorlabs
0.8 mm2 SI photodetector with an adapter for a ST connector used at the receiver end.
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E5071C
E5071C
Agilent
VNA used to modulate the source with the RF signal.
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DL-5147-042
DL-5147-042
SANYO
Commercial red laser diode used as an optical source.
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EDL1000T-EVB
EDL1000T-EVB
Firecomms
POF commercial transceiver based on a VCSEL at 665 nm.
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GH4002
GH4002
Mitsubishi
1-mm core polymethyl-methachrilate (PMMA) fibre with step-index (SI) profile used for all the measurements.
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B0605005
B0605005
Cutter with a metal razor used to cleave the fibre end.
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Micro-Strip?
Micro-Strip?
Jacket stripper used to remove 1 cm of the fibre's jacket.
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ZKL-1R5
ZKL-1R5
Mini Circuits
Electrical amplifier connected to the VNA.
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