公开(公告)号：EP1306718B1

公开(公告)日：2012-06-06

申请号：EP00963066.6

申请日：2000-10-03

Applicant: Japan Science and Technology Agency

Inventor： YAMASHITA, Shinji ,  TORII, Kenichi

IPC: G02F1/35 ,  H04B10/18

CPC classification number: G02F1/3536 ,  G02F2001/211 ,  G02F2201/02 ,  G02F2203/06

Abstract: A wavelength converter which employs an optical fiber and has high converter efficiency. The polarization planes of a signal light and an exciting light outputted from a laser diode (LD) (103) are respectively controlled by polarization controllers (PC's) (101 and 104) and the phases of the lights are respectively modulated by phase modulators (PM's) (102 and 105) in accordance with modulation signals outputted from an oscillator (110). Then, the output lights from the PM's (102 and 105) are multiplexed by a coupler (106). After the multiplexed signal light and exciting light are amplified by an optical amplifier (EDFA) (107), they are inputted to a dispersion shift fiber (DSP) (108). After wavelength transformation (four light waves mixing (FWM)) is practiced in the DSP, an FWM light is outputted through a band-pass filter (BPF) (109).

公开(公告)号：EP1400819B1

公开(公告)日：2009-05-20

申请号：EP02733242.8

申请日：2002-05-29

Applicant: Japan Science and Technology Agency

Inventor： YAMASHITA, Shinji ,  NASU, Yusuke

IPC: G02B6/02

CPC classification number: G02B6/02138 ,  G02B6/02085 ,  G02B6/02114 ,  G02B6/02152

Abstract: A super−structure/fiber/Bragg/grating is produced independently of a phase mask length. First, a beam is allowed to scan with the relative position between a mask and an optical fiber fixed (step 1). Then, the relative position between the mask and optical fiber is moved in the fiber’s length direction (step 2). And a beam is allowed to scan with the relative position between the mask and optical fiber fixed as in step 1. Next, the mask is removed and a uniform ultraviolet beam is applied to the optical fiber for the purpose of correcting and matching a phase shift to thereby be able to change a reflectance uniformly, whereby the optical length of that portion is chanced to provide a phase shift (step 3). A phase shift−imparting position may be any position except that between the both fixed positions. A phase shift amount is determined by a ultraviolet beam irradiation time (or light pulse number), and whether or not a necessary phase shift amount has been attained is determined while a reflection spectrum is being observed. The repetition of the above steps can produce an SSFBG of a free length.

公开(公告)号：EP1367427B1

公开(公告)日：2007-11-14

申请号：EP02702737.4

申请日：2002-03-05

Applicant: Japan Science and Technology Agency

Inventor： YAMASHITA, Shinji

IPC: G02F1/01 ,  H01S3/07 ,  G02B6/36

CPC classification number: G02B6/274 ,  G02B6/024 ,  G02B6/2713 ,  G02B6/2766 ,  G02B6/29302 ,  G02B6/29395 ,  G02F1/0128 ,  G02F1/0134 ,  G02F1/0136 ,  G02F1/178 ,  G02F2203/15 ,  H01S3/005 ,  H01S3/0064 ,  H01S3/0407 ,  H01S3/042 ,  H01S3/067 ,  H01S3/06704 ,  H01S3/06712 ,  H01S3/06791 ,  H01S3/08086 ,  H01S3/0941 ,  H01S3/1053 ,  H01S3/106 ,  H01S3/1067 ,  H01S3/1068 ,  H01S3/1608

Abstract: Characteristics are rendered variable and high-functional by using the side-pressure inductive polarization mode coupling of a PMF to thereby change the position and magnitude of a side pressure. An input light is incident via a polarizer (2), and an outgoing light is output via the PMF (1) and another polarizer (3). Light may enter and go out in an opposite way. The PMF (1) has two polarization axes orthogonal to each other, and the polarization axis of the polarizer (2) is coupled so as to agree with one end of the polarization axis of the PMF (1). The polarization axis of the polarizer (3) is coupled so as to agree with one end of the polarization axis of the PMF (1). The PMF (1) induces polarization mode coupling when a polarization light tilted a specified angle with respect to the polarization axis is incident to apply a side pressure to the PMF (1). Characteristics/functions can be changed by changing the position and the magnitude of a side pressure by an application unit (5) so that the length of the PMF (1) of a basic structure can be easily set precisely.