← Back to Patent Explorer
EP0250819A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Optical heterodyne receiver

Assignee: Alcatel Lucent Deutschland AG
•
Filing: 1987-05-16
•
Granted: —
•
Expires: 2007-05-16
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Translated from German Es werden optische Überlagerungsempfänger für ASK-, PSK-, FSK- und DPSK-modulierte Signale angegeben, die eine Polarisationsregeleinrichtung enthalten. Der Empfänger enthält eine Einrichtung (Q, Qʹ, Qʺ), die nach dem Differenzdetektorkonzept zur Unterdrückung des Intensitätsrauschens des Lokaloszillators (LO) arbeitet, der zirkular polarisiertes Licht abgibt. Er enthält ferner ein Quadraturdemodulator (D, Dʹ, Dʺ) der außer dem Nutzsignal (N) auch Regelsignale (S E , S W ) zur Polarisationsregelung abgibt, durch die die Elliptizität und der Winkel der Polarisation des Empfangslichts E S geregelt werden, derart, daß das Empfangslicht E S unter einem Winkel von 45° oder 135° linear polarisiert ist. Optical superimposition receivers for ASK, PSK, FSK and DPSK modulated signals are specified which contain a polarization control device. The receiver contains a device (Q, Qʹ, Qʺ) that works according to the difference detector concept to suppress the intensity noise of the local oscillator (LO), which emits circularly polarized light. It also contains a quadrature demodulator (D, Dʹ, Dʺ) which, in addition to the useful signal (N), also emits control signals (S E , S W ) for polarization control, by means of which the ellipticity and the angle of the polarization of the received light E S are regulated, such that that the receiving light E S is linearly polarized at an angle of 45 ° or 135 °.

Inventors

  • 👤 Friedemann Dr. Mohr

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-29 14:43
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/61; H04B10/615; H04B10/6151; H04B10/64

Claims Analysis

Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag