We fabricated a narrow linewidth 1.55μm directly-modulated distributed-feedback (DFB) laser. The laser exhibits an
output power of 14mW at 100mA, flat frequency response with -3 dB bandwidth of 18 GHz, the third-order
intermodulation distortion (IMD3) with 39.8dBm, narrow optical linewidth with 181kHz, and RIN below -135.7dB/Hz
in the 0.1-10GHz range along with the high side-mode suppression ratio (<52dB). We also experimentally verified the
modulation bandwidth, linearity, and linewidth is related to the bias current. The characteristics of the laser, namely
sufficient modulation bandwidth, high linearity, low relative intensity noise (RIN) and narrow linewidth, make it the
perfect candidates for high dynamic directly modulated analog optical link.
An ultra wideband optical frequency comb (OFC) generator based on semiconductor Quantum dot F-P cavity is packaged by our group. The free spectral rage (FSR) of the OFC can be tunable from 97GHz to 100GHz and the pulse width of the 100GHz OFC is 1.2ps.The full span of the OFC spectra is 80nm with a Gaussian shaped, and in span of 10nm, the flatness of the OFC can be limited to 1.7dB. The OFC has the advantages of small volume, simple and compact structure, low power dissipation, and has an ultra-wide bandwidth and flat spectrum, which can be used in the field of arbitrary waveform generation, channel information processing, and optical frequency division multiplexing.