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4953 Vine Street San Diego, CA 92465


Mon – Sat 8:00 – 18:00
Sun – Closed

Quality Support
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All of our products are designed with attention to detail and go through a rigorous testing and quality control process from prototype to final production.


  • 4 x 53GBaud CWDM 400GBASE-FR4 Ethernet
  • Compatible to QSFP28 Transceivers Up to 2km
  • Low Insertion Loss Optical Filter Based MUX
  • Integrated EML’s and Monitor PD’s
  • Cooled Operation by TEC and Thermistor
  • Electrical Interfaces Via Separate RF and DC FPC’s
  • Optical Interface with SMF XMD-MSA LC Receptacle


  • IEEE 802.3bs 400GBASE-DR4 Ethernet Application
  • IEEE 802.3bs 400GBASE-FR4 Ethernet Application 
  • 4 x 56GBaud CWDM Transceivers


  1. DFB-LD characteristics are tested on the condition of 52.5 oC by controlling of TEC temperature.
  2. DFB-LD operation current condition is Ith + 50mA.
  3. EA modulator drive voltage is -0.5V.

Package Specifications (Unit: mm)

Electrical Pad Configurations

* Each channel from L0 to L3 is corresponding to the input signal with center wavelength of 1271, 1291, 1311, and 1331nm respectively.

All statements, technical information and recommendations related the products herein are based upon information believed to be reliable and accurate. However, the accur acy or completeness thereof is not guaranteed, and no responsibility is assumed for any inaccuracies. The user assumes all risks and liability whatsoever in connection with the use of a product or its application. Coset Inc. reserves the right to change at any time without notice the design, specifications, function, fit or form of its products describ ed herein, including withdrawal at any time of a product offered for sales herein.