摘要:
An optical property of a device under test (DUT) is determined from a detected DUT response signal, or a signal derived therefrom, whereby the DUT response signal represents a signal response of the DUT in response to a composite signal or a signal derived from said composite signal. The composite signal comprises superimposed signals delayed with respect to each other.
摘要:
An optical property of a device under test (DUT) is determined from a detected DUT response signal, or a signal derived therefrom, whereby the DUT response signal represents a signal response of the DUT in response to a composite signal or a signal derived from said composite signal. The composite signal comprises superimposed signals delayed with respect to each other.
摘要:
The invention relates to an optical device (11) comprising an emitting source (12) and a partly-reflective element (21) which is adapted for receiving an emitted light beam (16). This element (21) is tilted in a small angle with respect to the emitted light beam (16). A portion (23) of the emitted light beam (16) is reflected by the partly-reflective element (21) towards a transmittive element (23) which is arranged in close proximity to the emitting source (12) and adapted to receive and transmit the reflect portion (23).
摘要:
An optical attenuator (10) for attenuating an incident optical beam (15) comprises at least two attenuating devices (20A, 20B), each having a polarization dependent attenuation characteristic with a preferred orientation. The attenuating devices are arranged in the optical beam (15) in a way that the preferred orientations of the polarization dependent attenuation characteristics substantially compensate each other, at least partially in defined locations (C).