Patent ID: 9654213
Date: 2017-05-16
CPC Classifications: G01M,H04B,H04Q

Claim:
1. A portable test instrument for measuring an optical power of each of a first optical signal (S 1 ) and a second optical signal propagating concurrently in opposite directions in an optical transmission path ( 16 , 16 / 1 , . . . , 16 / 9 ) between two network elements ( 10 , 14 / 1 , . . . , 14 / 9 ), at least one ( 14 / 1 , . . . , 14 / 9 ) of the network elements being operative to transmit the first optical signal (S 1 ) only if it continues to receive the second optical signal (S 2 ) from the other ( 10 ) of said network elements, the portable test instrument comprising first and second connector means ( 22 , 24 ) for temporarily connecting the portable test instrument into the optical transmission path in series therewith, and propagating and measuring means ( 32 , 38 , 46 ) connected between the first and second connector means for propagating at least said second optical signal (S 2 ) towards said at least one ( 14 ) of the network elements, the propagating and measuring means ( 32 , 38 , 46 ) being operable to measure an optical power of each of the first optical signal (S 1 ) and the second optical signal (S 2 ) wherein the propagating and measuring means comprises coupler means (