Abstract
This paper demonstrates a wavelength-division-multiplexed passive optical network (WDM-PON) scheme based on novel reconfigurable optical amplifiers (ROAs). The measured switching characteristics of the ROA3 constructed with a 2 × 2 crossbar optical switch and a four-port reversible optical circulator (OC) and a conventional EDFA can meet the requirements of most network management and surveillance. The self-made four-port reversible OC’s response time is less than 2 ms, and its insertion losses are about 1 dB or less for all the transmission paths and switching states. An optimal design of ROAs is proposed and evaluated for bidirectional optical amplifier protection, in which ROA3 has an EDF length of 7.5 m long with a 1480 nm pump laser and possesses a backward or forward pumping configuration with the corresponding pump power of 200 mW or 50 mW. We verified the scheme’s feasibility through a simulation of WDM-PON systems with 40 downstream and upstream channels. This scheme enables the intelligent protection switching in practical operation scenarios for high-capacity multi-wavelength networks.
Highlights
The wavelength-division-multiplexed passive optical network (WDM-PON) will play a promising role in future broadband access solutions, owing to its wide bandwidth, high security, easy upgradeability, and network flexibility [1,2,3]
The output signal from port 2 of the optical circulator (OC) is launched into the bypass path of the 2 × 2 crossbar optical switch in ROA3 and fed to a standard single-mode fiber (SSMF) that is connected to a 1 × N arrayed-waveguide grating (AWG) at the remote node (RN)
We model the erbium-doped fiber amplifier (EDFA) using a built-in rate equation in VPI 8.5 in order to realize the optimum design of the bidirectional EDFA in ROA3
Summary
The wavelength-division-multiplexed passive optical network (WDM-PON) will play a promising role in future broadband access solutions, owing to its wide bandwidth, high security, easy upgradeability, and network flexibility [1,2,3]. The low-cost WDM-PON schemes using tunable lasers have become practical for deployment in the access and transport networks and are considered in the standardization process [4,5]. These schemes can provide the needed bandwidth and performance for future mobile networks as well as reach extension and service provisioning for thousands of users. In [13], the proposed optimal protection architecture for WDM-PONs based on various design rules can protect the fixed transceivers, the EDFA in an optical line terminal (OLT), and the trunk between the OLT and remote node (RN).
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