H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/08 (2006.01) H04J 14/02 (2006.01)
Patent
CA 2218951
The power of an optical signal (s1) travelling on a channel (.lambda.1) of a WDM transmission system, is measured using a signature bit pattern (s BP1) which is inserted in the frame of the optical signal (s1). The power level of s BP1 is adjusted at the launching point to a predetermined ratio (m) with the power of the optical signal. At a point of interest, the fiber is tapped and a fraction of the tapped signal, that includes a corresponding fraction of s BP1, is converted to an electrical signal. The fraction of s BP1 is extracted from a the electrical signal and power of s BP1 is measured. This gives the optical power of s1 as (m) is known and also the calibration constant for the respective channel (.lambda.1) is known. The method can be applied for any and all channels of the WDM transmission system.
Habel Richard A.
Harley James
Nortel Networks Limited
Northern Telecom Limited
Ridout & Maybee Llp
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