Automatic laser shutdown and recovery in response to a link break

Patent metadata

Field	Value
Publication number	US-9264134-B2
Application number	US-23985708-A
Country	US
Kind code	B2
Filing date	Sep 29, 2008
Priority date	Sep 29, 2008
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

A communication system may include a first control circuit to detect a break on a first optical link; a first optical source to supply a first optical signal on a second optical link in response to detecting the break on the first optical link, the first optical signal propagating in a first direction on the second optical link; a second control circuit to detect a presence of the first optical signal on the second optical link, and output a control signal in response to detecting the presence of the first optical signal; and a second optical source to supply a second optical signal on the second optical link, the second optical signal propagating in a second direction opposite the first direction, where the Raman pump is disabled in response to the control signal.

First claim

What is claimed is:

1. A communication system, comprising:
a first optical source configured to supply a first optical signal to a first optical link, the first optical signal propagating in a first direction along the first optical link;
a second optical source configured to supply a second optical signal to a second optical link, the second optical signal propagating in the first direction along the second optical link;
a first control circuit configured to:
detect an absence of the first optical signal on the first optical link resulting from a break in the first optical link, and
output a first signal in response to detecting the absence of the first optical signal;

a third optical source configured to supply a third optical signal to the second optical link in response to the first signal, the third optical signal propagating in a second direction different than the first direction;
a second control circuit configured to:
detect a presence of the third optical signal on the second optical link, and
output a second signal in response to detecting the presence of the third optical signal; and

a fourth optical source configured to supply a plurality of fourth optical signals to the second optical link, the plurality of fourth optical signals propagating along the second optical link in the second direction;
an optical supervisory channel transmitter configured to supply an optical supervisory channel to the second optical link, the optical supervisory channel propagating in the second direction and carrying information indicative of the break in the first optical link; and
a transmitter amplifier coupled to the first optical link,
where the second optical source is disabled in response to the second optical signal, and the second optical signal provides Raman gain to the fourth optical signal, and the transmitter amplifier is disabled in response to the optical supervisory channel.

2. The communication system of claim 1 , where each of the first optical signal and the third optical signal has a wavelength of approximately 1610 nm.

3. The communication system of claim 1 , where the third optical source is configured to modulate the third optical signal as a modulated third optical signal based on the first signal, the modulated third optical signal indicating, to the second control circuit, to disable the second optical source, where the second control circuit is configured to output the second signal in response to detecting the modulated third optical signal.

4. The communication system of claim 1 , further comprising:
a fifth optical source configured to supply a fifth optical signal to the first optical link, the fifth optical signal propagating in the second direction along the first optical link.

5. The communication system of claim 4 , where the first control circuit is further configured to output a third signal in response to detecting the absence of the first optical signal, where the fifth optical source is disabled in response to the third signal.

6. The communication system of claim 5 , where the first control circuit is further configured to:
detect a presence of the first optical signal on the first optical link, and
output a fourth signal in response to detecting the presence of the first optical signal on the first optical link, where the fifth optical source is enabled in response to the fourth signal.

7. The communication system of claim 4 , where the second control circuit is further configured to output a third signal in response to detecting the third optical signal, the third signal causing the first optical source to modulate the first optical signal as a modulated first optical signal, the modulated first optical signal indicating, to the first control circuit, to enable the fifth optical source.

8. The communication system of claim 7 , where the first control circuit is further configured to:
detect a presence of the modulated first optical signal on the first optical link, and
output a fourth signal in response to detecting the presence of the modulated first optical signal, where the fifth optical signal is enabled in response to the fourth signal.

9. The communication system of claim 1 , where the first control circuit is further configured to:
detect a presence of the first optical signal on the first optical link, and
output a third signal in response to detecting the presence of the first optical signal on the first optical link, where the third signal causes the third optical source to modulate the third optical signal as a modulated third optical signal, the modulated third optical signal indicating, to the second control circuit, to enable the second optical source.

10. The communication system of claim 9 , where the second control circuit is further configured to:
detect a presence of the modulated third optical signal on the second optical link, and
output a fourth signal in response to detecting the presence of the third optical signal, where the second optical source is enabled in response to the fourth signal.

11. The communication system of claim 1 , further comprising:
a fifth optical source supplying a fifth optical signal to the second optical link, the fifth optical signal propagating in the second direction along the second optical link.

12. The communication system of claim 11 , where the first control circuit is further configured to output a third signal in response to detecting the absence of the first optical signal, where the fifth optical source is disabled in response to the third signal.

13. The communication system of claim 12 , where the first control circuit is further configured to:
detect a presence of the first optical signal on the first optical link, and
output a fourth signal in response to detecting the presence of the first optical signal on the first optical link, where the fifth optical source is enabled in response to the fourth signal.

14. The communication system of claim 11 , where the second control circuit is further configured to output a third signal in response to detecting the presence of the third optical signal, the third signal causing the first optical source to modulate the first optical signal as a modulated first optical signal, the modulated first optical signal indicating to the first control circuit to enable the fifth optical source.

15. The communication system of claim 1 , further comprising:
a fifth optical source supplying a fifth optical signal to the first optical link, the fifth optical signal propagating in the first direction along the first optical link.

16. The communication system of claim 15 , where the second control circuit is further configured to output a third signal in response to detecting the third optical signal, where the fifth optical source is disabled in response to the third signal.

17. The communication system of claim 1 , further comprising:
a fifth optical source supplying a fifth optical signal to the second optical link, the fifth optical signal propagating in the second direction along the second optical link; and
a sixth optical source supplying a sixth optical signal to the first optical link, the sixth optical signal propagating in the first direction along the first optical link.

18. A communication system, comprising:
a first control circuit configured to detect a break on a first optical link;
a pilot laser configured to supply a first optical signal on a second optical link in response to detecting the break on the first optical link, the first optical signal propagating in a first direc

Assignees

• Kerr David
• Laliberte Mark
• Van Gieson Avery
• Lai John
• Jepsen Kim
• Lu Wei
• Han Yan
• Placidet Marc
• Gliese Ulrik
• Copeland David
• Yang Guangning
• Infinera Corp

Inventors

• Kerr David
• Laliberte Mark
• Van Gieson Avery
• Lai John
• Jepsen Kim
• Lu Wei
• Han Yan
• Placidet Marc
• Gliese Ulrik
• Copeland David
• Yang Guangning

Classifications

• H04B10/071

  using a reflected signal, e.g. using optical time domain reflectometers [OTDR] · CPC title

• H04B10/0773 Primary

  Network aspects, e.g. central monitoring of transmission parameters · CPC title