Frequency metrology for wavelength division multiplexed optical fiber communications

Wavelength calibration is essential to ensure channel stability and characterize optical components for wavelength division multiplexed optical fiber communications. I will discuss the optical frequency metrology requirements, future trends, and our research in this area.

Wavelength division multiplexing (WDM) in optical fiber communication systems increases bandwidth by using many wavelength channels. Current WDM systems typically employ 50 or 100 GHz channel spacing (0.4 or 0.8 nm, respectively) in the 1530–1565 nm region, but systems may move to narrower channel spacing. WDM will likely expand into other wavelength regions as well, possibly covering the entire range from about 1280 to 1630 nm. At the same time, systems are pushing toward higher b it rates, with 10 Gb/s systems currently available and 40 Gb/s systems under development.