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Fabrication and lasing characteristics of λ = 1.56 μm tunable twin-guide (TTG) DFB lasers

Fabrication and lasing characteristics of λ = 1.56 μm tunable twin-guide (TTG) DFB lasers

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© The Institution of Electrical Engineers
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The operation principle and fabrication process of the tunable twin-guide (TTG) DFB laser diode are presented. The TTG-DFB laser is a novel single-frequency tunable laser which needs only a single control current for a wide continuous tuning range. Very low cw threshold currents of 12–18 mA at room temperature, spectral line-widths as low as 20–30 MHz, and a continuous tuning range of 1.5 nm at a tuning current of 60 mA are obtained with first, still non-optimised devices. The threshold current and spectral line-width vary only slightly over the entire tuning range.

Inspec keywords: gallium compounds; semiconductor junction lasers; III-V semiconductors; indium compounds; distributed feedback lasers; gallium arsenide; laser tuning

Other keywords: operation principle; wide continuous tuning range; tunable twin guide DFB laser; 60 mA; fabrication; single-frequency tunable laser; single control current; CW threshold currents; spectral linewidths; semiconductor laser; 1.56 micron; 12 to 18 mA; tuning current; lasing characteristics; InGaAsP-InP

Subjects: Laser beam modulation, pulsing and switching; mode locking and tuning; Design of specific laser systems; Lasing action in semiconductors; Semiconductor lasers

References

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