Selfconfiguring optical fibre-tap/photodetector modulator with very high photodetection efficiency and high extinction ratio
A high-contrast, multiquantum well reflection modulator in series with a constant current source, gives a very efficient photodetector which only absorbs optical power in proportion to the fixed current. Excess optical power is reflected and can be passed on, via waveguide or free-space interconnects to other optical ‘taps’ in a daisy chain configuration.