Hello, everyone. Today, I'd like to share my knowledge about Single-fiber Unidirectional & Single-fiber Bidirectional.
The WDM system supports signal transmission in two modes: Single-fiber Unidirectional and Single-fiber Bidirectional.
Single-fiber Unidirectional:
In this mode, the WDM system transmits multi-wavelength optical signals in receive and transmit directions through separate fibers.
Feature
Simple design and low requirements.
Easy fault isolation and performance monitoring.
Convenient O&M, and flexible networking that facilitating upgrading and capacity expansion.
Single-fiber Bidirectional:
In this mode, multi-wavelength optical signals are transmitted through only one fiber in both receive and transmit directions.
This mode is mainly used on the client side, implemented through the filtering function of a single-fiber bidirectional optical module. Different center wavelengths are used for the two directions.
Feature
This mode is characterized by a 50% savings in fiber resources compared with the single-fiber unidirectional mode.
However, its design and O&M of the WDM system are more complicated. Protection ranges must be configured for separating wavelengths to prevent signal interference in two directions, which wastes spectrums.
