10 Gbit/s delay modulation using a directly modulated DFB laser for a TWDM PON with converged services [invited]

A 10 Gbit/s transmission with delay modulation is demonstrated using directly modulated lasers for time- and wavelength-division-multiplexed passive optical networks (TWDM PONs), and error-free performance is achieved over 20 km standard single-mode fiber with a small dispersion penalty. Delay modul...

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Bibliographic Details
Published in:Journal of optical communications and networking 2015-01, Vol.7 (1), p.A87-A96
Main Authors: Cheng, Ning, Zhou, Min, Effenberger, Frank J.
Format: Article
Language:English
Subjects:
Delay modulation
Dual-rate transceiver
Modulation
Optical fiber dispersion
Optical fibers
Optical signal processing
Optical transmitters
Passive optical networks
Passive optical networks (PON)
Radio frequency
Raman crosstalk
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Summary:A 10 Gbit/s transmission with delay modulation is demonstrated using directly modulated lasers for time- and wavelength-division-multiplexed passive optical networks (TWDM PONs), and error-free performance is achieved over 20 km standard single-mode fiber with a small dispersion penalty. Delay modulation can also mitigate the crosstalk from the TWDM PON downstream signals to the coexisting RF video signal because of its small power spectral density at low frequencies. The carrier-to-crosstalk ratio of the RF video signal is improved by about 10 dB using delay modulation, instead of nonreturn-to-zero (NRZ) modulation, for 10 Gbit/s downstream transmissions in a TWDM PON. Furthermore, using low-pass-filtered 2.5 Gbit/s NRZ modulation and bandpass-filtered 10 Gbit/s delay modulation, dual-rate transmission is demonstrated for converged services in a TWDM PON. Experimental results exhibit 37.7 and 25.7 dB power budgets, respectively, for simultaneous 2.5 and 10 Gbit/s transmissions over 20 km standard single-mode fiber.
ISSN:1943-0620
1943-0639
DOI:10.1364/JOCN.7.000A87