| 摘要 |
In practical WDM systems, the maximum SMSR for each channel does not necessarily occur where dP out/dI tun = 0. In fact, for most channels the maximum SMSR occurs at values of tuning current where this first derivative in not zero. In accordance with one aspect of the invention, a wavelength stabilized optical transmitte r includes a DBR laser and a feedback loop for controlling the center wavelength of the laser, characterized in that the transmitter also includes a memory in which are stored the non- zero values of dP out/dI tune where the SMSR is a maximum for each of a multiplicity of different channel wavelengths and further includes a controller responsive t o the stored values for delivering to the laser a level of tuning current that maximizes the SMSR for a particular channel wavelength.
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