4x25Gb/s CWDM4 ROSA for 100 Gb/s

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Broadcom's CWDM4 ROSA is a 4 × 25-Gb/s, 1310-nm CWDM receive optical sub-assembly, consisting of an optical demultiplexer to separate the inputs, four high reliability PIN photodiodes, and integrated TIAs. These elements are packaged with an LC receptacle. The electrical interface is through a flex connect. The ROSA is intended for use in QSFP28, CFP4, and other types of modules, for links up to 2 km.
Supported module specifications include but are not limited
to the CWDM4 MSA.


  • Four high-reliability PIN photodiodes
  • ƒƒIntegrated TIAs
  • ƒƒ0 to +75°C ROSA case operating temperature range
  • ƒƒ25.78125-Gb/s data rate for each channel
  • ƒƒMechanical design suitable for QSFP28 and CFP4 applications
  • ƒƒLC receptacle
  • ƒƒNominal input wavelengths: 1271 nm, 1291 nm, 1311 nm, 1331 nm
  • ƒƒFlex circuit electrical interface


  • 100Gb/s QSFP28 transceivers
  • 100Gb/s CFP4 transceivers

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory No
Form Factor QSFP28 compatible
Connector Type LC receptacle
Fiber Type Single Mode
Maximum Distance (km) 2
Nominal Optical Wavelength (nm) CWDM
Emitter DFB
RoHS6 Compliant Y