| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an optical integrated device, where sufficient extinction ratio can be obtained under high output and a low operating voltage, where the optical integrated device is formed by integrating a distribution feedback type semiconductor laser element and an EA modulator. SOLUTION: In the optical integration device, a distribution feedback type semiconductor laser element is connected and integrated to an optical modulator utilizing a modulation system, due to electric field absorption. In this case, when the oscillation wavelength of the distribution feedback type semiconductor laser element, and the gain peak wavelength of the optical modulator are set to beλandλ0 , respectively, when wavelength differenceΔλ(Δλ=λ-λ0 ) is at least 30 nm and less than 50 nm.</p> |
