mode suppression
1.At a bias of 53mA,the peak output power of two modes is 0.5mW with a side-mode suppression ration of 27dB.
2.Single mode emission of an external cavity laser was obtained experimentally at 1 GHz modulation with side mode suppression ratio better than 40 dB, 3 dB dynamic line width about 0.1 nm, and 20 dB dynamic line width about 0.3 nm.
3.Single mode emission with a side mode suppression ratio greater than 20dB for uncoated lasers is realized. Record low threshold currents of 50 and 80mA and record short cavity lengths of 145 and 170μm are achieved for λ≈5.4μm and λ≈7.84μm devices,respectively,in pulsed mode.
4.Good single mode operation of the external cavity laser over wide injected current range is obta ined with threshold current about 25 mA, side mode suppression ratio (SMSR) bett er than 40 dB. And the oscillation frequency of the laser can be emitted precise ly according to the ITU-T wavelength nominal value.
5.The threshold current of the device uncoated with length of 300μm is 11.5mA. The maximum output power is 14mW at 100mA. A side mode suppression ratio of 35.5dB is obtained.
6.In the tuning range, the EML output power variation is less than 3 dB, the extinction ratio variation is very little and the side mode suppression is maintained more than 30 dB. A wavelength fast tunable EML by using phase tuning is also proposed.
7.Laser emission with side mode suppression ratio more than 25 dB, spectrum linewidth narrower than 60 kHz is realized at 1.55 μm wavelength region experimentally by coupling a conventional multimode semiconductor laser with a fiber Bragg reflective (FBR) filter fabricated by ourselves.
8.High attenuation to low frequency,excellent perform ance of common mode and differential mode interfere nce suppression.
9.Introduces a system based on AT91RM9200(ARM9 Processor) which is applied in the new resonant grounding mode through the arc suppression coil.
