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Modulated single-longitudinal mode semiconductor laser and fiber transmission characteristics at 1.55 µm

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4 Author(s)
Yamada, Jun-Ichi ; NTT Public Corp., Tokyo, Japan ; Kobayashi, S. ; Nagai, Haruo ; Kimura, Tatsuya

A laser light injection technique was studied to realize a semiconductor laser transmitter oscillating in a 1.55 μm single-longitudinal mode. When -15 dBm optical power was injected into the directly modulated laser, no dispersion degradation was observed in the error rate characteristics after transmitting through 44.3 km single-mode fibers at 100 Mbits/s. Effective gain coefficient g-\alpha , measured by the light injection method, was 45 cm-1near threshold. As this gain was sufficiently saturated at the -15 dBm injection power, undesired longitudinal modes in the modulated laser were suppressed.

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Quantum Electronics, IEEE Journal of  (Volume:17 ,  Issue: 6 )