Multiple-cavity semiconductor laser capable of generating ultras

Details Multiple-cavity semiconductor laser capable of generating ultras Multiple-cavity semiconductor laser capable of generating ultras

1995-04-06

1996-12-17

Davie, James W.

Coherent light generators

Particular resonant cavity

Plural cavities

372 18, 372 25, 372 26, 372 28, 372 50, 372 96, H01S 3082, H01S 310, H01S 319

Patent

active

055861385

ABSTRACT:
A semiconductor laser is provided which is capable of generating a train of ultrashort light pulses with an ultrahigh repetition frequency and which is useful in optical communications and optical information processing. The semiconductor laser is a mode-locked semiconductor laser which has two resonator cavities which are formed by two facets and a distributed feedback structure between these two facets. The length of the resonator cavity formed between one facet and the distributed feedback structure is 1/m (where m is an integer) of the length of the resonator cavity formed by the other facet and the distributed feedback structure. A saturable absorption region and a high-frequency modulation region are provided within the longer of the resonator cavities. By making the high-frequency modulation frequency be equal to the round trip frequency of the light within the longer resonator cavity, mode-locked operation is achieved. Because of the linking of the shorter resonator cavity, a train of light pulses having a repetition frequency of m times the mode-locked pulse train frequency is obtained.

REFERENCES:
patent: 5455836 (1995-10-01), Li et al.
"Monolithic Colliding-Pulse Mode-Locked Quantum-Well Lasers" by Young-Kai Chen and Ming C. Wu; IEEE Journal of Quantum Electronics, vol. 28, No. 10; Oct. 1992.

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