Patent ID: 7496253

Claim:
A wide passband optical interleaver, comprising: a first optical splitter, having a first output terminal and a second output terminal for just adapting two optical routes; a first optical route of the two optical routes, coupled to the first output terminal; a first optical filter having a transmission coefficient ρ 1 coupled on the first optical route; a second optical route of the two optical routes, coupled to the second output terminal; a second optical filter having a transmission coefficient ρ 2 and a delay, coupled on the second optical route; and a second optical splitter, having two input terminals for receiving the first optical route and the second optical routes, wherein the transmission coefficients ρ 1 and ρ 2 are determined by satisfying a desired quantity of effective group delay ratio T, defined as T = 1 - ρ 1 1 + ρ 1 - 1 - ρ 2 1 + ρ 2 . wherein the quantity T is in a range between 0.43 and 0.56 when an operation at 30 dB crosstalk or the quantity T is in a range between 0.32 and 0.7 when an operation at 20 dB crosstalk.