Abstract
The passive optical network WDM-PON is one of the most dominant performers of all communication systems, and provides sufficient broadband service. Providing enough data for the demands of today and the future, marks this area as a critical topic for researchers. The first goal of this article is to study the performance of OFDM in a bidirectional WDM-PON by using QAM and BPSK modulation methods in the downstream link. The second goal is to build the upstream link with WBTW-SOA and show its ability to transmit the upstream signal with low equipment. Sending and receiving signals from the central office to the last mile, and opposite of the network up to 100 Km via a bidirectional single mode optical fiber (SMF) was successfully achieved.
Highlights
Provisioning broadband services for downloading and uploading high definition data has become a difficult requirement for data providers
The first goal of this article is to study the performance of orthogonal frequency division multiplexing (OFDM) in a bidirectional wavelength division multiplexing in passive optical network (WDM-PON) by using quadrature amplitude modulation (QAM) and BPSK modulation methods in the downstream link
The carrier signal of an OFDM is the sum of the orthogonal subcarriers, which are individually modulated by different types of modulation such as quadrature amplitude modulation (QAM) or phase-shift keying (PSK)
Summary
Provisioning broadband services for downloading and uploading high definition data has become a difficult requirement for data providers. Covering users’ data demand for the future has encouraged many researchers to find suitable ways to develop transmitted or received data. Using a wavelength division multiplexing in passive optical network (WDM-PON) is one of the implementations that have been added to cover this additional demand Figure 1. An easy way to provide multi-paths, which are used in most broadband systems between transmitters and receivers, is to use OFDM. In order for WDM-PON to provide multi-paths between the transmission and reception terminals, M-QAM OFDM must be used. We have proposed an OFDM bidirectional WDM-PON design that is modulated by several types of QAM for the downstream, and uses a wideband traveling wave semiconductor optical amplifier WBTW-SOA for the upstream.
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