An adjustable diffractive light modulator is used to equalize the power
level of wavelength multiplexed signals in wavelength division
multiplexing applications. An optical channel transmits a multi-wavelength
input signal through a wavelength demultiplexer. The input signal
comprises a plurality of component signals defined according to a
plurality of wavelengths. The de-multiplexer spatially separates the
multi-wavelength input signal into its respective plurality of component
signals, which are transmitted through a plurality of optical channels
onto a plurality of controllable diffractive light modulators. The
diffractive light modulators are advantageously comprised of grating light
valves. Component signals are reflected off their respective diffractive
light modulators and collected in a plurality of optical channels for
re-transmission into a wavelength multiplexer. The reflected signals are
combined through a multiplexing process and transmitted as an output beam.
Control of the diffractive light modulator is achieved by sensors
measuring the power level of signals passing through the plurality of
optical channels. The measured power levels of light are converted to
digital values which are input into an electronic controller for
processing. Control output signals from the controller are used to
independently control individual pixels within the diffractive light
modulator to equalize the reflected light signals.
Um modulador claro diffractive ajustável é usado igualar o nível do poder de sinais multiplexed wavelength em aplicações multiplexing de divisão de wavelength. Uma canaleta ótica transmite um sinal de entrada do multi-multi-wavelength através de um demultiplexer do wavelength. O sinal de entrada compreende um plurality dos sinais componentes definidos de acordo com um plurality dos wavelengths. O de-multiplexer spatially separa o sinal de entrada do multi-multi-wavelength em seu plurality respectivo dos sinais componentes, que são transmitidos com um plurality das canaletas óticas em um plurality de moduladores claros diffractive controllable. Os moduladores claros diffractive são compreendidos vantajosamente de válvulas claras grating. Os sinais componentes são refletidos fora de seus moduladores claros diffractive respectivos e coletados em um plurality das canaletas óticas para o re-transmission em um multiplexer do wavelength. Os sinais refletidos são combinados com multiplexing process e transmitidos como um feixe da saída. O controle do modulador claro diffractive é conseguido pelos sensores que medem o nível do poder dos sinais que passam com o plurality das canaletas óticas. Os níveis medidos do poder da luz são convertidos aos valores digitais que input em um controlador eletrônico para processar. Os sinais de saída do controle do controlador são usados controlar independentemente pixels individuais dentro do modulador claro diffractive para igualar os sinais claros refletidos.
