4x25Gb/s CWDM4 TOSA for 100 Gb/s

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The Broadcom CWDM4 TOSA is an uncooled, 4 × 25-Gb/s, 1310-nm CWDM transmit optical sub-assembly, consisting of four high-reliability, direct-modulated DFB lasers, integrated-driver ICs for the lasers, monitor PIN photodiodes, and an optical multiplexer to combine the outputs from the four lasers. These elements are packaged with an LC receptacle. The electrical interface is through flex connects. The TOSA 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, high performance DFB lasers
  • Integrated laser driver ICs
  • ƒFour monitor photodiodes
  • ƒƒ0 to +75°C TOSA case operating temperature range
  • ƒƒ25.78125-Gb/s data rate for each channel
  • ƒƒMechanical design suitable for QSFP28 and CFP4 applications
  • ƒƒLC receptacle, with integrated optical isolator
  • ƒƒNominal 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