Patent ID: 9654744
Date: 2017-05-16
CPC Classifications: H04B,H04J,H04N

Claim:
1. A method for transmitting burst mode optical signals, the method comprising: receiving, via feeder legs, reverse electrical signals provided by subscribers in an upstream direction; combining the reverse electrical signals to generate a combined reverse electrical signal; checking for the presence of a subcarrier signal within the combined reverse electrical signal via a carrier detecting circuit; generating a first signal when the subcarrier signal is present; switching on a laser in response to the generated first signal; frequency modulating a carrier signal with the combined reverse electrical signal; intensity modulating the laser with the frequency modulated carrier signal to produce an optical signal when the subcarrier signal is detected; and preventing transmission of the optical signal when the subcarrier signal is no longer present, wherein preventing the transmission of the optical signal comprises generating a second signal at the end of the presence of the subcarrier signal, and switching off the laser in response to the generated second signal preventing the transmission of the optical signal.