Definition: The word "ableptical" refers to an instrument used in optical communication systems, which includes both passive and active components. Passive components are used for data transmission between two optical receivers or transmitter and receiver pairs, while active components include amplifiers, phase-shifters, filters, and couplers. The ability of the device to transmit or receive light is determined by the configuration of its elements. In an "ableptical" system, the output signals are typically modulated onto a carrier wave using optical modulation techniques like polarization mixing or quadrature amplitude modulation (QAM), and the signals are then received at different points in the signal chain. An example of such a system is a digital optical modem (D-Modem) which uses active components to transmit data.
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