DWDM wavelength lock tightens from ±12.5GHz to ±3.5GHz, pushing optical interconnect costs
jwt0625 · x · 2026-10-08
The author notes that locking the relative wavelengths of the DWDM grid—not even the absolute wavelengths—adds significant cost and work. At OFC earlier this year, demos showed bare DFB arrays locked to a reference ring FSR at ±4GHz (200±15GHz); now the tolerance has tightened from ±12.5GHz to ±3.5GHz, reflecting rapidly rising wavelength-stability demands for AI datacenter optical interconnects.
Related event: DFB Laser Array Wavelength Locking Tightened to ±3.5GHz(2 posts)→
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