Claims
- 1. A Mach-Zehnder interferometer comprising two optical couplers intercommunicated together by two optical fibers at least one of which is a temperature insensitive fiber in which temperature induced changes in the geometrical length and refractive index of the temperature insensitive fiber offset each other whereby the optical path length of the temperature insensitive fiber is unaffected by change in temperature.
- 2. A Mach-Zehnder interferometer according to claim 1 wherein each of the two optical fibers is a temperature insensitive fiber.
- 3. A Mach-Zehnder interferometer according to claim 2 wherein the two optical fibers are of different length.
- 4. A Mach-Zehnder interferometer according to claim 3 wherein each optical coupler has arms of substantially equal length and with each arm connected to an individual one of the two optical fibers.
- 5. A Dense Wavelength Division Multiplex system comprising a Mach-Zehnder interferometer comprising two optical couplers intercommunicated together by two optical fibers at lest one of which is temperature insensitive fiber in which temperature induced changes in the geometrical length and refractive index of the temperature insensitive fiber offset each other whereby the optical path length of the temperature insensitive fiber is unaffected by change in temperature.
- 6. A Mach-Zehnder interferometer according to claim 1 wherein the temperature insensitive fiber is shorter than the other fiber.
- 7. A Mach-Zehnder interferometer according to claim 1 wherein the temperature insensitive fiber is longer than the other fiber.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2,315,006 |
Aug 2000 |
CA |
|
2,314,997 |
Aug 2000 |
CA |
|
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a divisional of application Ser. No. 09/920,050 filed Aug. 2, 2001.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09920050 |
Aug 2001 |
US |
Child |
10886553 |
Jul 2004 |
US |