Last updated on 04/7/2021
The O-band transceivers have been extensively used for high-speed Ethernet. The primary reason is that dispersion compensation is much easier in the O-band than in the C-band. These transceivers are produced to meet an industry standard (e.g. IEEE), and some tests require boosting the optical signals. Unlike the C-band, however, fiber amplifiers are not commonly available in the market.
Here we propose one scheme that is useful for transceiver testing, in which PDFA and optical filters are combined.
One typical case where PDFA and tunable filter is eye pattern measurement by an oscilloscope. In many cases the output from a transceiver TX is too weak for oscilloscope measurement and optical boosting is required. A PDFA boosts the WDM signal, and one channel is sliced by a tunable filter. The tunable filter possesses a built-in attenuator, and the output power to an oscilloscope is automatically adjusted.
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