公开(公告)号：JP2000214420A

公开(公告)日：2000-08-04

申请号：JP2000009595

申请日：2000-01-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LI YUAN P ,  WANG YAN

IPC: G02F1/01 ,  G02F1/21 ,  G02F1/225 ,  H04B10/08 ,  H04J14/00 ,  H04J14/02

Abstract: PROBLEM TO BE SOLVED: To obtain a system for monitoring light in plural channels in a wavelength division multiplex communication system by allowing an optical filter to have prescribed transfer functions whose scanning peaks are preliminarily determined and allowing cascaded Mach-Zehnder circuits to be provided with one pair of one light input and one light output. SOLUTION: An optical filter 300 has prescribed transfer functions whose scanning peaks are preliminarily determined and wide cyclic peaks of these transfer functions can shift frequency spectrums up and down by operating a heater 216. Moreover, the optical filter 300 includes the prescribed number N of pieces of cascaded Mach-Zehnder circuits 200 and the circuits 200 to which labels MZ1 to MZN are affixed are connected in series by using an independent port connection. Then, an optical signal 303 enters into a first Mach-Zehnder circuit MZ1 being at the side of one side of the filter 300 and goes out from the last Mach-Zehnder circuit MZN.

公开(公告)号：JPH1073735A

公开(公告)日：1998-03-17

申请号：JP18565297

申请日：1997-06-09

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LI YUAN P ,  WANG YAN

IPC: G02B6/126 ,  G02B6/12 ,  G02B6/122 ,  G02B6/125

Abstract: PROBLEM TO BE SOLVED: To enable a Y-shaped splitter excellently formed by optical lithography and only using a processing step compatible with a waveguide having the large difference of a specific refractive index. SOLUTION: An optical power splitter is composed of an input waveguide area capable of propagating optical energy of a basic mode E1 and having a prescribed width W and at least two output waveguide areas arranged so as to receive at least a part of the optical energy from the input waveguide area. The respective output waveguide areas have the prescribed widths W, capable of propagating optical energy of a basic mode E2 , the output waveguide areas are separated by a prescribed gap of width (d) and the basic modes E1 and E2 are almost equal at the beginning of the output waveguide areas. The physical dimensions of the widths and the width of gap 108 of the input waveguide area and the output waveguide area are determined based on the evaluation of the transfer characteristic of the splitter by a mode matching principle.