公开(公告)号：JPH08162697A

公开(公告)日：1996-06-21

申请号：JP31539194

申请日：1994-12-19

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIN KEIKEN ,  RI GAKUKEI ,  BOKU SHIYOEN ,  RI KAZUTSUNE

IPC: H01S3/07 ,  H01S3/06 ,  H01S3/067 ,  H01S3/08 ,  H01S3/083 ,  H01S3/10 ,  H01S3/102 ,  H01S3/106 ,  H01S3/23 ,  H04B10/00 ,  H04B10/25 ,  H04B10/12 ,  H04B10/13 ,  H04B10/135 ,  H04B10/14

Abstract: PURPOSE: To provide a variable wavelength multiwavelength optical fiber laser composition by the use of a single pump light source. CONSTITUTION: The output of a single pump light source (LD) is inputted into a wavelength division multicoupler(WDM-C), and optical fibers (EDF) containing erbium (Er) being in a large number of optical paths branched by a multibranch optical fiber coupler (1×N coupler) are pumped, and a variable wavelength optical filter (TF) is inserted into each optical path. In each optical path an optical isolator (ISO) is used, and an optical attenuator (Atu) is used so as to make multiwavelength laser oscillation possible by adjusting the mode beating between modes of each wavelength. A variable optical fiber coupler (VC) performs a function of adjusting the coupling ratio of a laser resonator so as to make the output of the optical fiber laser maximum, and plays a role of an output terminal. To make an optical attenuator unnecessary in a one-side optical path (Path 1), the length of the erbium (Er) optical fiber (EDF1) is changed composed of those of other optical paths.

公开(公告)号：JPH07287262A

公开(公告)日：1995-10-31

申请号：JP31730594

申请日：1994-12-20

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： RI GAKUKEI ,  KIN KEIKEN ,  BOKU SHIYOEN ,  RI KAZUTSUNE

IPC: G02B6/00 ,  G02B26/02 ,  G02B26/08 ,  G02F1/313 ,  G02F1/35 ,  H04Q11/00

Abstract: PURPOSE: To eliminate the speed limitation of switching, due to the work-off effects of control light and signal light by additionally introducing the another control light, having suitable time delay for the existent control light. CONSTITUTION: This device is provided with a beam splitter 6 for splitting the control light provided from a control light source 3 into two control beams Ic1 and Ic2 in the ratio of 50:50, delayer 7 and mirror 8 for making one of two control beams incident to a 2nd wavelength divided optical fiber coupler 5, after delaying it for prescribed time in order to keep the difference between the transmission time of one of two control beams and the transmission time of the other signal beam. Thus, the other control beam Ic2 having the same intensity as one control beam, while keeping a suitable delay time for the control beam Ic1 to be used, is added from the conventional non-linear loop mirror structure, and a switching window having the same width as that time delay period is opened. Namely, the size of the switching window is unrelated to the work-off between control light and signal light.