Optical circuit arrangement with 2 optical circuit elements in series has second element at least approximately complementary to first in terms of dependency of optical characteristic on control power

摘要

The arrangement has a first optical circuit element (1) switchable between at least first and second states by applying electrical control power and a second element (1') in series with the first and switchable between at least first and second states by applying electrical control power. The second element is complementary or approximately complementary to the first in respect of the dependency of its optical characteristic on the control power.