Title:
LASER, OPTICAL AMPLIFIER AND OPTICAL AMPLIFICATION METHOD
Document Type and Number:
Japanese Patent JP3296195
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To ensure a high and flat gain while suppressing noise by an arrangement wherein a pumping light source comprises first and second light sources of different wavelength and the first light source has a wavelength corresponding to the difference between a specific energy level of Er and a higher energy level.
SOLUTION: The laser comprises photocouples 3, 4, an amplifier optical fiber 5 added with Er, an optical isolator 6, and a pumping light source comprising first and second light sources 1, 2 having a different wavelength. The first light source 1 has a wavelength corresponding to the difference between the 4I13/2 energy level of Er and a higher energy level. Consequently, even when an infrared ray transmitting fiber, e.g. a fluoride fiber, is employed as a host of Er, low noise amplification can be realized in a 1.55μm band through so-called 0.98μm excitation. This arrangement realizes an optical amplifier having a flat gain in high band and low noise characteristics.
Inventors:
Yasutake Oishi
Makoto Yamada
Teruhisa Kanamori
Shoichi Sudo
Makoto Yamada
Teruhisa Kanamori
Shoichi Sudo
Application Number:
JP19070596A
Publication Date:
June 24, 2002
Filing Date:
July 19, 1996
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H01S3/10; H01S3/06; H01S3/067; H01S3/16; H04B10/00; H04B10/2507; H04B10/293; (IPC1-7): H01S3/10; H01S3/16; H04B10/00
Domestic Patent References:
| JP8116117A | ||||
| JP5129683A | ||||
| JP6318754A | ||||
| JP5181176A | ||||
| JP6508961A |
Other References:
電子情報通信学会春季大会講演論文集 Ｐｔ．４（１９９３）ｐ．４−７３「Ｂ−９３５ Ｅｒドープ光
Attorney, Agent or Firm:
Yoshikazu Tani (1 person outside)