1. Technical Field
The present invention relates to an optical signal output apparatus, an electrical signal output apparatus, and a test apparatus.
2. Related Art
Conventionally, when applying jitter to an optical signal, the optical signal and a waveform-modulated signal output from a variable wavelength light source are input to a wavelength converting element, and the wavelength-converted signal output from the wavelength converting element is input to a device that delays this signal by a delay amount corresponding to the wavelength of the wavelength-converted signal, as shown in Patent Document 1, for example.    Patent Document 1: Japanese Patent Application Publication No. 2008-151670
A method using such a waveform converting element, however, has poor efficiency because the conversion efficiency of the wavelength converting element is approximately 10% or less. Furthermore, when modulating the wavelength of the output light from the variable wavelength light source at a high speed, a semiconductor laser whose input current is modulated may be used as the variable wavelength light source, but this results in the intensity being modulated at the same time.
USPTO Backgrounds
USPTO Backgrounds