A high-speed DFB laser module in butterfly housing has been fabricated in our laboratory, which is operated in direct
modulation for Ku-band. The bandwidth of the laser module is measured up to 18 GHz with highly linear characteristics
and low relative intensity noise. The input points for 1 dB compression and third order interception of the laser have also
been obtained as 23 dBm and 30 dBm respectively, and it can be utilized in analog optical link systems with good
performance.
In this paper, the injection locking technique is investigated by applying the external lightwaves to a Fabry-Perot laser
(FP-LD). The static and dynamic characteristics are studied in detail, which include optical spectrum analysis such as the
output intensity, the side mode suppression ratio (SMSR), and the mode selection characters, as well as the dynamic
linewidth suppression, the wavelength detuning speciality, and the frequency responses. With proper adjustments, the
maximum SMSR of 50 dB is obtained, and the frequency response of the injection-locked FP-LD has been improved
with the proper wavelength detuning. Besides, we concentrate on the applications of the injection locked FP-LD in
wavelength-division-multiplexing passive optical network (WDM-PON) systems, and a protection scheme for WDMPON
transmitters spare function is proposed and demonstrated at the same time. Compared with the conventional
methods, this proposed architecture provides a cost-effective and reliable protection scheme employing a common FPLD.
In the experiment, a 1:36 protection capability was implemented, in the wavelength range from 1537.4 nm to 1565.4
nm.
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