Method to achieve optical heterodyne reception, insensitive to phase and/or polarization, for an FSK-modulated signal

Abstract

Abstract 2.1 For FSK-modulated optical transmission signals using an intermediate frequency which is very low in comparison with a data rate of the transmission signals, a simple method is specified to achieve phase-insensitive and/or polarisation-insensitive optical heterodyne reception for such a signal. …<??>2.2 For this purposes, for each clock cycle of the transmission signal (S), the phase of this signal (S) is sampled at the start (A1) and in the centre (M) of the clock period (T) of this clock cycle between 0 DEG or 90 DEG and/or the polarisation of this signal (S) is sampled at least at the start (A2) of the second and at the start (A4) of the fourth quadrant of this clock cycle (T) between two mutually orthogonal polarisation states and the phase-independent and/or polarisation-independent output signal (AS) of the receiver (ÜE) is obtained from the signal (S) sampled in this manner in a simple optical heterodyne receiver (ÜE) for FSK-modulated transmission signals (S). …<??>2.3 Optical heterodyne reception …<IMAGE>…

Inventors

• 👤 Eckhard Dipl.-Ing. Meissner

Bibliographic Details