1.5 μm λ/4-shifted DFB LD filter and 100 Mbit/s two-channel wavelength signal switching

Transfer-matrix analysis of optical bistability in DFB semiconductor laser amplifiers with nonuniform gratings

“…The capability of tuning the transmission peak via direct variation of (i.e., pump current) enriches the device applications of semiconductor amplifiers. For example, this tunability has been used as the basis for a wavelength-division demultiplexer [22]- [24].…”

1.5 mu m two-section Fabry-Perot wavelength tunable optical filter

“…Especially, semiconductor wavelength tunable optical filters are suitable for monolithic integration with semiconductor optical devices such as laser diodes, semiconductor optical switches, and photodetectors [2]. As a semiconductor wavelength tunable optical filter, a X/4-shifted passive waveguide grating filter [3], distributed feedback (DFB) filters [4], [5] have been demonstrated. A X/4-shifted passive waveguide grating filter [3] has an advantage of a wide wavelength tuning range, but it cannot amplify a light input.…”

“…A X/4-shifted passive waveguide grating filter [3] has an advantage of a wide wavelength tuning range, but it cannot amplify a light input. DFB filters [4], [5] have advantages of a high gain and a narrow bandwidth. However, a X/4-shifted passive waveguide grating filter [3] and DFB filters [4], [5] have disadvantages in that the bandwidth and the transmissivity change with wavelength tuning.…”

“…DFB filters [4], [5] have advantages of a high gain and a narrow bandwidth. However, a X/4-shifted passive waveguide grating filter [3] and DFB filters [4], [5] have disadvantages in that the bandwidth and the transmissivity change with wavelength tuning. Magari et al have solved this problem by using a multielectronic DFB filter [6].…”