This paper proposes a circuit control method achieving the flat-top steep-edge response of photodetectors. The response
is realized using three wavelength selective photodetectors and the circuit which consists of amplifiers, comparators and
a AND gate. Two groups of experiments were carried out. In group 1, 0.5dB, 3dB, 20dB bandwidths are 2.76nm,
3.29nm, 4.58nm from 1546nm to 1549.3nm. In group 2, 0.5dB, 3dB, 20dB bandwidths are 3.19nm, 2.89nm, 3.06nm
from 1554.8nm to 1557.6nm. The results of experiments show that the desirable flat-top steep-edge response can be
gained and the response linewidth is adjustable by selecting different photodetectors, so that the requirement of the
WDM system and the network can be met. The method is easy to realize with low cost and has wide application in
optical measurements and optical processing etc.
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