Networking

As we know, a common SFP transceiver is generally with two ports, one is TX port which is used to transmit the signal, and the other one is RX port which is used to receive signals. Unlike common SFP transceiver, BiDi SFP transceiver is only with one port which uses an integral WDM coupler to transmit and receive signals over a single strand fiber. In fact, the compact SFP is a 2-channel BiDi SFP, which integrates two BiDi SFP in one SFP module. Therefore, a compact SFP is also with two ports as the common SFP. SFP, BiDi SFP and Compact SFP Connection Methods All  SFP transceivers  must be used in pairs. For common SFPs, we should connect the two SFPs which have the same wavelength together. For example, we use a 850nm SFP at one end, then we must use a 850nm SFP on the other end (shown in the figure below). For  BiDi SFP , since it transmits and receives signals with different wavelengths, we should connect the two BiDi SFPs which have the opposite wa...

Compared with copper wire, optical fiber’s dominant advantage is the overwhelming information carrying capability, and its high bandwidth and low attenuation easily offset its higher cost. FTTx (fiber to the x) architecture is a typical example of substituting copper by fiber in high data rate traffic. FTTx is a generic term for any broadband network architecture that uses optical fiber to replace all or part of the usual metal local loop used for the last mile telecommunications. The x can be substituted by another letter determined by the delivery topologies that are categorized according to where the fiber terminates. What are the termination places and which letter can be used to substitute x? This article will introduce some FTTx terms. Different FTTx Architectures Usually the FTTx items that we are going to introduce are used loosely, as some relate to each other, or just acronyms. Generally the FTTx configurations may fall into two groups: fiber laid all the way to the prem...