US 5,297,223 A · Transmission systems for polarization-independent transmission of signals

Abstract

Transmission system for the polarization-insensitive transmission of signals over a signal route (ST) between a first system connection point (S1) for a transmitter (T) and a second system connection point (S3) for a receiver (R), and between two further system connection points (S2 and S4) for an additional transmitter and a receiver. On one side the high-order retarder (HR) is disposed between the system connection points and the signal route (ST). The system comprises a first and a second hybrid circuit (H1, H2) each provided with two unidirectional connection points and a bidirectional connection point. The unidirectional connection points form the system connection points (S1 to S4 inclusive). The bidirectional connection point of one of the hybrid circuit (H1) is connected via the high-order retarder (HR), and the bidirectional connection point of the other hybrid circuit (H2) is connected directly, to the signal route (ST).

Claims33

Dependent claims

Transmission system for the polarisationinsensitive transmission of signals over a signal route between a first and a second transceiver, each comprising a transmitter (T) and a receiver (R), the receiver comprising a detector (D), a local oscillator (LO) and a device for coupling the output signal of the oscillator to the detector, characterised in that a passive high-order retarder (HR) is connected in series with the signal route (ST) between said signal route and a bidirectional port of a three-port hybrid circuit (H) and in that a said transmitter (T) and a said receiver (R), respectively, are connected to the other ports of the hybrid circuit (H).

Transmission system for the polarisation-insensitive transmission of signals over a signal route between a first system connection point for a transmitter and a second system connection point for a receiver, in which transmission system a high-order retarder (HR) is incorporated between one of the system connection points and the signal route (ST), characterised in that the system comprises

a first hybrid circuit (H1) provided with a first unidirectional connection point and a second unidirectional connection point, and a first bidirectional connection point, the first unidirectional connection point forming the first system connection point (S1) and the second unidirectional connection point forming a third system connection point (S2),
a second hybrid circuit (H2) provided with a first unidirectional connection point and a second unidirectional connection point, and a first bidirectional connection point, the first unidirectional connection point forming the second system connection point (S3) and the second unidirectional connection point forming a fourth system connection point (S4),
the third system connection point (S2) and the fourth system connection point (S4) being connection points for a transmitter and a receiver (T, R) or for a receiver and a transmitter (R, T), respectively, and the high-order retarder (HR) being connected to the bidirectional connection point of one of the hybrid circuits (H1 or H2) and the signal route (ST).

Dependencies are inferred from the claim text.

Transmission systems for polarization-independent transmission of signals

Life of this patent

Transmission systems for polarization-independent transmission of signals

Life of this patent

Abstract

Claims33