Long-reach wavelength division multiplexing passive optical networks by using the position adjustment of broadband light source

Abstract

The present invention relates to a wavelength division multiplexing passive optical network (WDM-PON) for long-reach transmission using a position adjustment of a broadband light source (BLS), and particularly relates to a WDM-PON which extends s transmission distance of the WDM-PON by adjusting a position of a BLS so as to procure a high quality of service (QoS) and to reduce transmission costs in an optical network. A WDM-PON for long-reach transmission using a position adjustment of a broadband light source (BLS) in accordance with the present invention comprises a central office (CO) comprising an A-band BLS to be injected into a light source for downstream signals, an A-band BLS coupling device for coupling the A-band BLS, a first wavelength-division multiplexer / de not multiplexer connected to the A-band BLS coupling device for multiplexing / demultiplexing, and a plurality of first optical transceivers connected to the first wavelength-division multiplexer / d emultiplexer; a remote node (RN) comprising a B-band BLS coupling device and a second wavelength-division multiplexer / demultiplexer connected to the B-band BLS coupling device for multiplexing / demultiplexing, and being connected to the CO through an optical fiber; and a plurality of optical network terminations (ONTs) including a plurality of second optical transceivers connected to the second wavelength-division multiplexer / demultiplexer, wherein either the RN or one of the plurality of ONTs further includes a B-band BLS to be injected to a light source for upstream signals.An optical network system includes a central office (CO) comprising an A-band BLS to be injected into a light source for downstream signals, an A-band BLS coupling device for coupling the A-band BLS, a first wavelength-division multiplexer / demultiplexer connected to the A-band BLS coupling device for multiplexing / demultiplexing.

Description

technical field [0001] The present invention relates to a wavelength division multiplexed passive optical network (WDM-PON) for long-distance transmission using position adjustment of a broadband light source (BLS). More particularly, the present invention relates to a WDM-PON that extends the transmission distance of the WDM-PON to obtain high quality of service (QoS) and reduce transmission costs in an optical network by adjusting the location of a BLS. Background technique [0002] As the rapid growth of the Internet resulted in the evolution of voice and text-oriented services into video-based services, the need for wider bandwidth per user has also increased. To meet such demands, research on fiber-based passive optical networks (PONs) has been actively conducted. PON technology is divided into time division multiplexing passive optical network (TDM-PON) and WDM-PON. [0003] Usually, in PON, the maximum transmission distance between each user and the central office (...

AI Technical Summary

Problems solved by technology

However, when the output power increases, there are some disadvantages that the cost for BLS increases rapidly and it becomes difficult to realize BLS

Also, it is not easy to control high power BLS

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