20 nm wavelengty tunable singlemode picosecond pulse generation at 1.3 μm by self-seeded gain-switched semiconductor laser

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20 nm wavelengty tunable singlemode picosecond pulse generation at 1.3 μm by self-seeded gain-switched semiconductor laser

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© The Institution of Electrical Engineers
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A back reflection of less than 0.25% of the monochromatised emitted power of a gain switched laser diode is shown to switch the laser from longitudinal multimode to singlemode pulsed operation. The pulse shape (FWHM = 45 ps) is not affected by the feedback. A wavelength detuning of 20 nm with a sidemode suppression ratio better than 13 dB and a peak value of 22 dB were found from a simple experimental setup using a 9:1 fibre coupler and an external grating.

Inspec keywords: laser transitions; laser tuning; semiconductor lasers; laser modes

Other keywords: 1.3 micron; semiconductor laser; feedback; self-seeded; LD; laser diode; external grating; sidemode suppression; wavelength tunable; singlemode pulsed operation; gain-switched; wavelength detuning; fibre coupler; picosecond pulse generation; longitudinal multimode

Subjects: Laser beam modulation, pulsing and switching; mode locking and tuning; Semiconductor lasers; Lasing action in semiconductors

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