| 摘要 |
PROBLEM TO BE SOLVED: To minimize the manufacturing cost of a passively modelocked fiber laser of high reliability by employing saturable absorber together with a highly- birefringent erbium doped optical fiber. SOLUTION: A WDM coupler 22 is arranged in a pig tail 18 between a laser diode 16 and an annular splice 20. A signal light entering the pig tail 18 through a dichroic mirror 14 from a fiber 12 is isolated from a pump by the WDM coupler 22, and directed toward an output part. A semiconductor saturable absorber mirror 24 is arranged on the other end of a highly- birefringent fiber 12. The fiber is made to abut against the mirror 24 and bonded to it. Low power reflectivity larger than 80% and carrier life of 10 psec can be obtained. That is, when a pumping laser is switched on several times, a modelocked operation along either of two polarization axes can be observed while being accompanied by random distribution between the two axes. |
