OSP hardened WDM network
First Claim
1. A WDM add/drop multiplexer structure comprising a plurality of WDM laser assemblies, wherein the WDM add/drop structure is arranged, in use, in a manner such that a controlled temperature environment is created around laser sources of the laser assemblies, and in a manner such as to be capable of creating the controlled temperature environment around the laser sources while the WDM add/drop multiplexer structure is subjected to an outside temperature ambient experienced in an Outside plant (OSP) situation.
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Accused Products
Abstract
A WDM add/drop multiplexer structure comprising a plurality of WDM laser assemblies, wherein the WDM add/drop structure is arranged, in use, in a manner such that a controlled temperature environment is created around laser sources of the laser assemblies, and in a manner such as to be capable of creating the controlled temperature environment around the laser sources while the WDM add/drop multiplexer structure is subjected to an outside temperature ambient experienced in an Outside plant (OSP) situation.
34 Citations
26 Claims
- 1. A WDM add/drop multiplexer structure comprising a plurality of WDM laser assemblies, wherein the WDM add/drop structure is arranged, in use, in a manner such that a controlled temperature environment is created around laser sources of the laser assemblies, and in a manner such as to be capable of creating the controlled temperature environment around the laser sources while the WDM add/drop multiplexer structure is subjected to an outside temperature ambient experienced in an Outside plant (OSP) situation.
- 22. A WDM add/drop multiplexer structure comprising a plurality of laser sources for providing optical WDM channel signals, wherein a wavelength spacing between the WDM channels is chosen in a manner which ensures that, in use, tolerated wavelength drifts of the laser sources as a result of tolerated temperature variations air equal to or less than the wavelength spacing.
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25. A laser assembly comprising:
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a semiconductor laser source, a heating unit for heating a junction of the laser source, a cooling unit for cooling the junction, and a control unit for controlling operation of the heating and cooling units, wherein the control unit is arranged, in use, to determine the actual temperature at the junction and to compare the actual temperature with a high reference temperature value and a low reference temperature value, and to activate the heating and cooling units based on that comparison, a controlled temperature environment around the laser source created, and wherein the laser assembly is arranged, in use, in a manner such as to be capable of creating the controlled temperature environment while being subjected to an outside temperature ambient experienced in an OSP situation.
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Specification