Relay transmission apparatus
AssigneeFujitsu Limited
InventorsGaku Kimura, Koji Takeguchi
Life of this patent
Estimating the term…
Abstract
A relay transmission apparatus in which the effectiveness of a protecting function is improved by suppressing variation of an OSNR value of a signal regardless of the distance that the signal is transmitted. The relay transmission apparatus is comprised of a first regenerative relay unit, a second regenerative relay unit, and a protection process unit for extracting a signal component from each of the first and second regenerative relay units and selectively outputting either of the extracted signal components as a drop signal.
Claims10
A relay transmission apparatus optically connected to first and second transmission routes that are different from each other, comprising:
- a first regenerating unit adapted to regenerate an optical signal input from the first transmission route and output a regenerated drop signal as a first signal;
- a second regenerating unit adapted to regenerate an optical signal input from the second transmission route and output a regenerated drop signal as a second signal;
- a first branching unit adapted to branch a power of the first signal from the first regenerating unit into two branched first signals;
- a second branching unit adapted to branch a power of the second signal from the second regenerating unit into two branched second signals;
- a first relay transmitting unit adapted to optically transmit one of the branched first signals to the second transmission route;
- a second relay transmitting unit adapted to optically transmit one of the branched second signals to the first transmission route;
- and
- a protection process unit adapted to selectively output either the other of the branched first signals or the other of the branched second signals as a drop signal, wherein
- the first regenerating unit includes a first optical-to-electrical conversion unit that converts the optical signal from the first transmission route into an electrical signal and a first drop signal generating unit that generates the regenerated drop signal output as the first signal based on the electrical signal from said first optical-to-electrical conversion unit, and
- the second regenerating unit includes a second optical-to-electrical conversion unit that converts the optical signal from the second transmission route into an electrical signal and a second drop signal generating unit that generates the regenerated drop signal output as the second signal based on the electrical signal from said second optical-to-electrical conversion unit.
A relay transmission apparatus optically connected to first and second transmission routes that are different from each other, comprising:
- a protection process unit adapted to selectively output either an optical signal input from the first transmission route or an optical signal input from the second transmission route;
- a signal generation unit adapted to regenerate the optical signal selectively output by the protection process unit and output a regenerated signal;
- a first branching unit adapted to branch the regenerated signal from the signal generation unit into two branched signals, and one of the two branched signals being output as a drop signal whereas the other of the two branched signals being output for relay transmission;
- and
- a second branching unit adapted to branch the other of the two branched signals from the first branching unit into two further-branched signals so that each of the two further -branched signals is transmitted to the first and second transmission routes, respectively.
Dependencies are inferred from the claim text.