| 摘要 |
Data transmission apparatus includes optical transmitters (14a, 14b) coupled to an optical link (10). A FEC coder (40) is coupled to the input of transmitter (14b'). A first signal (12a) having a first rate is provided to the first transmitter, and a second signal (12b) having a higher information rate than the first signal, while simultaneously enabling the respective output power levels of the amplifiers (18a, 18b). The transmission apparatus achieves higher transmission capacity while retaining compatibility with pre - existing fiber spans and amplifier nodes. An optical transmission system incorporates a transmitter (70) and a receiver (72) having certain transmission characteristics, such as output power level, decision threshold level, etc., that are adjustable in response to BER. A BER estimator (74) is provided at the receiving end of the link. The estimator estimates the BER o f the received signal, and provides BER to the receiver, and/or transmitter, and/or optical link, based on the estimated BER, to optimize performance.</S DOAB>
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