Method and apparatus for hardware-configured network
View Patent ↗A method for configuring hardware-configured optical links includes generating a first optical signal comprising a slow scan of wavelength channels where the slow scan has a dwell time on a particular wavelength channel. A second optical signal is generated comprising a fast scan of wavelength channels, where the fast scan has a dwell time on a particular wavelength channel and a complete channel scan time where the slow scan dwell time is greater than or equal to complete channel scan time. The first optical signal is transmitted over a link and a portion is then detected. A pulse of light having a duration that is less than the dwell time on the particular wavelength channel of the fast scan is then detected. Client data traffic is then sent over the link in response to the detected pulse of light and the detected portion of the first optical signal.
1. A method for establishing a communication link for coherent transceivers, the method comprising:
a) receiving an optical signal having a channel wavelength from a link;
b) mixing the optical signal having the channel wavelength with an optical signal comprising a fast scan of local oscillator channel wavelengths to generate a mixed optical signal;
c) detecting the mixed optical signal when the channel wavelength and a particular one of the local oscillator channel wavelengths are at a coincident channel wavelength, thereby generating an electrical detected signal;
d) determining a modulation bandwidth of the electrical detected signal; and
e) identifying the coincident channel wavelength as an occupied channel wavelength if the determined modulation bandwidth of the generated electrical mixed signal is greater than a predetermined bandwidth.
2. The method for establishing a communication link for coherent transceivers of claim 1 further comprising:
a) generating an optical signal comprising a slow scan of continuous-wave local oscillator channels and transmitting the optical signal comprising the slow scan of continuous-wave local oscillator channels over the link;
b) receiving a portion of the transmitted optical signal comprising the slow scan of continuous-wave local oscillator channels;
c) mixing the received portion of the transmitted optical signal comprising the slow scan of continuous-wave local oscillator wavelength channels with a second fast scan of local oscillator wavelength channels to generate a second mixed optical signal;
d) detecting the second mixed optical signal when a particular one of the continuous-wave local oscillator wavelength channels of the received portion of the transmitted optical signal and a particular one of the local oscillator wavelength channels of the second fast scan are at a second coincident wavelength channel, thereby generating a second electrical detected signal;
e) tuning a wavelength channel of a local oscillator in an optical transmitter to the second coincident wavelength channel; and
f) turning on an RF modulation to establish a communication link if the modulation bandwidth of the second electrical detected signal is less than a predetermined bandwidth.
3. The method for establishing a communication link for coherent transceivers of claim 1 wherein the fast scan of local oscillator channel wavelengths has a predetermined time sequence.
4. The method for establishing a communication link for coherent transceivers of claim 2 wherein the fast scan of local oscillator channel wavelengths has a predetermined time sequence.
5. The method for establishing a communication link for coherent transceivers of claim 2 wherein the second fast scan of local oscillator channel wavelengths has a predetermined time sequence.
6. The method for establishing a communication link for coherent transceivers of claim 2 wherein the slow scan of the continuous wave of local oscillator channel wavelengths has a predetermined time sequence.
7. The method for establishing a communication link for coherent transceivers of claim 6 wherein the predetermined time sequence of the slow scan comprises a random time between continuous wave local oscillator channels wavelengths.
8. The method for establishing a communication link for coherent transceivers of claim 2 wherein the fast scan and the second fast scan of local oscillator channel wavelengths has a predetermined time sequence and the slow scan has a second predetermined time sequence, wherein the predetermined time sequence of the fast scan and the second fast scan of local oscillator channel wavelengths is faster than the predetermined time sequence of the slow scan of the continuous wave local oscillator channel wavelengths.
9. The method for establishing a communication link for coherent transceivers of claim 8 wherein at least one of the predetermined time sequence of the fast scan and the second fast scan and the predetermined time sequence of the slow scan are selected to avoid collisions.
10. The method for establishing a communication link for coherent transceivers of claim 8 wherein the predetermined time sequence of the fast scan and the second fast scan is relatively fast compared with the predetermined time sequence of the slow scan.
11. The method for establishing a communication link for coherent transceivers of claim 1 wherein the occupied channel wavelength is removed from a subsequent slow scan.
12. The method for establishing a communication link for coherent transceivers of claim 2 wherein the fast scan is performed at a near-side coherent transceiver and the slow scan is performed at a far-side coherent transceiver.
13. The method for establishing a communication link for coherent transceivers of claim 2 wherein the fast scan is performed at a far-side coherent transceiver and the slow scan is performed at a near-side coherent transceiver.