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A monolithically integrated tunable transmitter consisting of tunable DFB laser array and Mach-Zehnder modulator is developed. Power penalty in the chromatic dispersion range of ±800 ps/nm with zero-chirp operation is less than 0.7 dB, modulating at 10-Gbit/s NRZ signal.
A monolithically integrated tunable transmitter consisting of a tunable DFB laser array and a Mach-Zehnder modulator with a 2-channel SOA is demonstrated. The total output power is twice that of the conventional configuration.
We analytically investigate the applicable areas of bidirectional optical amplifiers as regards 10-G/s class long-reach PONs and also discuss technical issues with both DFA and SOA based PON repeaters in terms of allowable repeater layout.
A traveling-wave-electrode InP n-p-i-n Mach-Zehnder modulator monolithically integrated with a semiconductor optical amplifier was developed. Loss-less operation and full C-band 40-Gbit/s DPSK modulation with a low driving voltage of 3 Vpp was successfully demonstrated.
A wavelength tunable DFB laser array is fabricated with a new design for spectral linewidth reduction. A narrow linewidth of <0.6 MHz is obtained over the entire tuning range (~40 nm) with a high fiber output power of 20 mW.
The mode-hop-free tuning range of a TDA-DFB laser with asymmetric units was successfully extended by employing strong optical confinement in the tuning layers. We achieved 110-channel operation with a 50-GHz grid for a 6-TDA-DFB laser array.
A quasi-continuous wavelength sweep range of 70 nm is achieved by utilizing thermal compensation in SSG-DBR lasers. The frequency spacing is set at 6.25 GHz, and the output power is 10 mW for the whole tuning range. Thermal drift compensation enhances wavelength accuracy, and realizes fast and stable tuning.
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