Patent ID: 6795610
Filing Date: 2004-09-21
Classification: G02B

Abstract:
A method for performing add/drop functioning, comprising:adjusting a first optical block to add and drop a wavelength &lgr;x, connecting the first optical block between a first end and a second end, such that a signal component at wavelength &lgr;x in a multiplexed signal is dropped out and a new signal component at wavelength &lgr;x is added thereto in the first optical block, wherein the multiplexed signal is received at the first end and output from the second end; adjusting a second optical block to add and drop a wavelength &lgr;y while the first optical block is being connected between the first end and the second end; and connecting the second optical block between the first end and the second end as soon as the first optical block is disconnected from the first end and the second end so that a signal component at wavelength &lgr;y in a multiplexed signal is dropped out and a new signal component at wavelength &lgr;y is added thereto in the second optical block.