## Pluggable Optics Modules – Thermal Specifications

Bonnie Mack and Terence Graham 1. Introduction Pluggable optics modules, (POMs), such as SFP, QSFP, QSFP+, QSFP28, CFP, CFP2, and CFP4 transceivers, are optical interface devices that are connected to a PCB through ports in the faceplate. A brief description of these modules is given in Table 1. Initially conceived as low power devices, the module power density has increased along with demand for higher bandwidth. Consequently, it is progressively more difficult to cool these modules. The modules are hot-pluggable and the faceplate port utilizes a PCB-mounted cage. These cages are folded sheet metal enclosures that press fit into the PCB and provide connector alignment and electromagnetic compatibility (EMC) features as shown in Figure 1. The cages generally prevent heatsinking to modul...

## Save Constellation Diagram as Picture from Matlab

Matalb able to provide a Constellation Diagram of mulation signal with below command. hScope = comm.ConstellationDiagram; step(hScope,rxSig) But we are not able to save it as a picture. that is because Matlab hide some menubar of the figure. We can show them with below code: shh = get(0,'ShowHiddenHandles'); set(0,'ShowHiddenHandles','On') set(gcf,'menubar','figure') set(gcf,'CloseRequestFcn','closereq') set(gcf,'DefaultLineClipping','Off') set(0,'ShowHiddenHandles',shh) Then you can see the diagram windows looks as below: