Future access technologies require higher bandwidth than today’s technologies. A promising candidate to full-fill this requirement is wavelength division multiplexing (WDM)- passive optical network (PON). This work describes how the usage of pilot tones enables the development a low-cost WDM-PON.
In this thesis, a new pilot tone generation method, which is based on a modified 8B/10B encoder, is introduced. The new generation scheme is experimentally demonstrated using a field programmable gate array (FPGA), and its performance is compared to existing generation methods.
Then, a centralised network wavelength control using individual pilot tones is presented which allows a optical network unit (ONU) to tune itself to its target channel. The centralised network wavelength control allows to remove the wavelength reference (etalon) from all ONUs and thus to reduce the overall costs.
Further cost savings on the ONU side can be gained by omitting the thermoelectric cooler (TEC) and reducing the calibration effort. Instead, generic equations and/or interpolation of the calibration data can be used. The work explains how the two concepts can be applied to two different laser types: Digital supermode - distributed Bragg reflector (DS-DBR) lasers and sampled grating Y-branch (SG-Y) lasers. Both concepts can also be used with the former introduced centralised network wavelength control and will subsequently also be experimentally demonstrated jointly.
Finally, a new method incorporating a second wavelength reference (etalon) is introduced. The new method provides a large lock-in range of an arbitrary target channel frequency. The theory of the new method is explained, and its usage will be demonstrated.
This grid-less wavelength locking is not limited to access networks can be used in several application, e.g. flexgrid with a very small channel spacing.
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Future access technologies require higher bandwidth than today’s technologies. A promising candidate to full-fill this requirement is wavelength division multiplexing (WDM)- passive optical network (PON). This work describes how the usage of pilot tones enables the development a low-cost WDM-PON.
In this thesis, a new pilot tone generation method, which is based on a modified 8B/10B encoder, is introduced. The new generation scheme is experimentally demonstrated using a field programmable gate...
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