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A novel tunable single mode light source has been developed in the InGaAsP/InP material system. The Y-coupled cavity (YCC) type integrated interferometric injection (I/sup 3/) wavelength tunable laser operates in the 1300 nm wavelength region with a sidemode suppression of about 20 dB. By adjusting the currents through the four all active sections of this YCC-I/sup 3/-laser, a total tuning range of...
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