Method and apparatus for obtaining phase or polarization insensi

Details Method and apparatus for obtaining phase or polarization insensi Method and apparatus for obtaining phase or polarization insensi

1990-04-18

1991-10-22

Eisenzopf, Reinhard J.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359122, 359156, H04B 1000

Patent

active

050603116

ABSTRACT:
Method and apparatus for obtaining phase and/or polarization-insensitive optical heterodyne receiving for DPSK or ASK-modulated transmission signal wherein an intermediate frequency which is very low as compared to the data rate of the signals is utilized and at every clock of the transmission signal the phase of the signal is shift keyed between 0.degree. and 90.degree. at the start A1 and in the middle M of the clock time T and the polarization of the signal is shift keyed at least at the start A2 of the second and at the start A4 of the fourth quarter of the clock time T. The transmission signal which is shift keyed in this manner is received by a simple optical heterodyne receiver which has the special characteristics that an intermediate frequency filter ZFF is an integrator which integrates over a respectively one-quarter of the clock time T.

REFERENCES:
patent: 4723316 (1988-02-01), Glance
patent: 4856093 (1989-08-01), Mohr
patent: 4856094 (1989-08-01), Heidrich et al.
patent: 4868897 (1989-09-01), Von Helmolt
Article Phase-Insensitive Zero-If Coherent Optical Detection Using Sinusoidal Phase Modulation Instead of Phase Switching and ECOC 1988 Part 2, pp. 65-68.

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