Abstract
The ever increasing capacity demand on optical networks and the
slowdown of improving spectral efficiency lead to the solution of
utilizing more wavelength band in existing optical fibers. More and more
operators will extend from C band to C+L bands, or plan to deploy C+L
systems, and in future they may utilize more of other bands. This paper
firstly discusses different optical layer architectures for multi-band
system. Using optical components that can natively support multi-band is
attractive to us, because in this way the multi-band system can be planned
and operated similarly with the single-band system, which is customer
friendly and potentially more economical. We address mainly three
technical challenges in this paper. The first one is the wide-band fiber
optical amplifier (OA). After a short review of recent research progress,
we propose a hybrid erbium-doped fiber (EDF) and bismuth-doped fiber (BDF)
based OA approach, and demonstrated single-stage amplification over 100 nm
in extended C+L bands. The second challenge is the optical cross connect
based on wavelength selective switch (WSS). It is not trivial to realize a
C+L-band WSS while preventing the key optical parameters (filtering
bandwidth, loss, channel isolation, etc.) to be degraded. We analyze
different technical schemes, and propose an optical design based on an
LCoS with a large panel size and a high-dispersion diffraction grating.
The optical design and simulation on a 2×35 WSS reveals this approach can
support 100-nm extended C+L spectrum and is promising for
commercialization. The third challenge is the SRS induced WDM channel
power inequality, which is more severe for multi-band system. We propose a
solution by using OAs with a novel optical spectrum processor (OSP).
Simulation and experiment showed that the power of the WDM channels can be
equalized on a per span basis, which can prevent accumulation of
stimulated Raman scattering (SRS) induced wavelength division multiplexing
(WDM) channel power transfer and can meanwhile keep the optical signal to
noise ratio (OSNR) of WDM channels well equalized.
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