| http://www.w3.org/ns/prov#value | - However, a wavelength tunable laser such as a TDA-DFB laser which can utilize refractive index variation by current injection to an optical waveguide and prevent occurrence of a mode hopping in such a manner as described above cannot fully cover the C-Band (1,525 to 1,565 nm) which is important in the WDM communication system because generally the wavelength variation width thereof is approximatel
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