| 摘要 |
The present invention propose an optical filter for filtering out at least a part of one of two spectral side-bands of a coded optical signal spectrum (2) having a carrier wavelength, the first of said side-bands which is to be transmitted by said filter being called transmitted side-band (21), the second of said side-bands which is to be filtered out by said filter being called vestigial side-band (22), said optical filter having a transmission response in intensity (3) having a maximum value at a central filter wavelength distinct from said carrier wavelength and located in said transmitted side-band, and said response being divided into two parts, a first filter part (31) associated to a wavelength region including said carrier wavelength, a second filter part (32) associated to a wavelength region which does not include said carrier wavelength, characterized in that at a given value of transmittance distinct from said maximum value, said second filter part has a filter width smaller than the filter width of said first filter part. <IMAGE>
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