Fig. 1. Schematic of experimental setup

Fig. 2. Spectra of the seeding light at 920 nm (a) before and (b) after amplification

Fig. 3. Relationship between linewidth of amplified laser and TA injection current

Fig. 4. Variation in fluorescent power and output power of TA with the injection current

Fig. 5. Output laser spectra with or without seed injection

Fig. 6. Relationship between the output power of TA and the seeding power

Fig. 7. Relationship between the output power of TA and injection current at different wavelengths