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公开(公告)号：JPH11174251A
公开(公告)日：1999-07-02
申请号：JP28149098
申请日：1998-10-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SCOTT D DAVIS , DAREN RI , LI YUAN P , NARAYANAN CHELLAPPAN , KEVIN G SULLIVAN , JANRUO ZANG
Abstract: PROBLEM TO BE SOLVED: To provide an optical transmission device provided with an optical planar waveguide provided with transmission characteristics independent of a temperature without using a temperature control device for preventing the shift of the center frequency of the waveguide and the optical transmission device by passive control to the thermal effect of the planar optical waveguide. SOLUTION: A substrate 16 supports a base material 13 and an optical core part 14, a control material 22 is adhered to the lower part of the substrate and the thermal expansion coefficients of the control material 22 and the substrate 16 are different. Corresponding to the rise and decline of an ambient temperature, the control material 22 is thermally expanded and contracted by a rate different from the substrate 16, non-planar substrate distortion transmitted to the optical core part 14 is generated and thus, the temperature dependency of an optical path length inside the optical core part 14 is opposed. In this case, the control material 22 is provided with the thermal expansion coefficient larger than the one of the substrate 16, compression force to the optical core part 14 is generated and the thermal expansion of the optical core part 14 is opposed.
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公开(公告)号：JPH11202152A
公开(公告)日：1999-07-30
申请号：JP30435598
申请日：1998-10-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI YUAN P
Abstract: PROBLEM TO BE SOLVED: To further improve the transmission characteristics of an individual pass band when the cascade connection of a DWDM is performed in the constitution of an ADM by generating a synthetic pass band having a band width wider than the band width of a narrow pass band, in which the wide band width has transmission characteristics to cooperate with the transmission characteristics of the narrow pass band. SOLUTION: A splitter 102 has a pair of waveguides, the width of that waveguide is w1, these widths are separated for a distance c1 and both of the waveguides enter a boundary 1a of a star coupler 1. On the other hand, a splitter 402 has a pair of waveguides, the width of that waveguide is w2, these widths are separated for a distance c2 and both of the waveguides enter a boundary 4b of a star coupler 4. Then, the wide pass band has characteristics combined with the transmission characteristics of a narrow pass band. Thus, a synthetic pass band having the band width wider than the band width of the narrow pass band can be generated.
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公开(公告)号：JPH11160559A
公开(公告)日：1999-06-18
申请号：JP27511598
申请日：1998-09-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HENRY CHARLES H , LI YUAN P
Abstract: PROBLEM TO BE SOLVED: To provide the optical device which has temperature-compensated optical waveguides. SOLUTION: This device has a core area having a 1st part 14 and a 2nd part 20 which is provided with plural optical waveguides and at least one of them is connected in series, and the core area is surrounded with a clad layer 16; and the 1st part 14 of the core area has 1st length formed from a material whose refractive index increases as temperature rises and the 2nd part 20 of the core area has 2nd length formed from a material whose refractive index decreases as temperature rises.
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公开(公告)号：JPH10274719A
公开(公告)日：1998-10-13
申请号：JP2165498
申请日：1998-02-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI YUAN P
Abstract: PROBLEM TO BE SOLVED: To provide the technology capable of decreasing insertion loss in an optical device. SOLUTION: This optical device having one or more input waveguides coupled with one side of a slab optical waveguide 20 and an array 26 of an output waveguide coupled with the other side of the slab optical waveguide is provided with a conversion area 22 directly adjacent to the slab. This slab operates to decrease insertion loss between the waveguide arrays 25, 26 and the slab waveguide 20. The conversion area 22 has a lot of silica paths crossing the waveguide array. The silica paths are gradually decreased in the width with parting from the slab waveguide. In an embodiment in accordance with this invention, the silica paths are parallel with each other and perpendicular to the waveguide arrays 25, 26. The silica paths have the same bending rate as that of the slab waveguide 20 and waveguide arrays 25, 26.
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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
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.
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Patent Agency Ranking
公开(公告)号：JPH11311814A
公开(公告)日：1999-11-09
申请号：JP6871099
申请日：1999-03-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DOERR CHRISTOPHER RICHARD , LI YUAN P
Abstract: PROBLEM TO BE SOLVED: To provide an optical add-drop multiplexer(ADM) which avoids crossing of waveguides by having Mach-Zehnder interferometer constitution having demultiplexer/multiplexer couples at respective shunts. SOLUTION: In ADM 60, the respective multiplexer/demultiplexer couples (300-1, 400-1) (300-2, 400-2) are interconnected by coherent connection waveguides 70 and 80 having heating elements 65 and 66 for increasing the path length of a selected connection waveguide. Waveguide optical couplers 61 and having an asymmetrical transfer function are used for the input port and output port of the ADM 60. Those couplers add and drop selected optical channels for an optical transmission line by cooperating with heating elements in active states.
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公开(公告)号：JPH10307224A
公开(公告)日：1998-11-17
申请号：JP12047798
申请日：1998-04-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI YUAN P
Abstract: PROBLEM TO BE SOLVED: To provide a wavelength dividing multiplexer(WDM) having a pass band being flatter than a Gauss type pass band without using a Y branch splitter and in which variation at the time of manufacturing are suppressed to a minimum. SOLUTION: A WDM 500 has a pair of star couplers 1 which are mutually connected by gratings having the array of waveguides with different lengths. By selecting the lengths of waveguides 50 of the gratings, the pass band of the WDM is made flatter than a conventional Gauss type pass band corresponding to such the WDM. The waveguides are divided into at least two groups 501 and 502 according to the lengths 1i . The first group has the lengths different from the respective other groups by a multiple of a certain length.
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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
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.
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公开(公告)号：JPH1073730A
公开(公告)日：1998-03-17
申请号：JP19165997
申请日：1997-07-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI YUAN P
Abstract: PROBLEM TO BE SOLVED: To provide a wavelength routing device without narrowing a channel even when many routing devices are connected in cascade. SOLUTION: A wavelength routing device 500 has a pair of dielectric slabs 10, 20 mutually connected by an optical grating 30. A power splitter connected to the dielectric slabs 10, 20 is a Y-shaped branch splitter 70 having one input waveguide and two output waveguides. A splitter 70-1 connected to a first dielectric slab 10 has a pair of adjacent waveguides whose widths w1 are nearly equal and a distance between centers is c1 . A splitter 70-2 connected to a second dielectric slab 20 has a pair of adjacent waveguides whose widths w2 are nearly equal and a distance between centers is c2 . In an embodiment, 4w2 >w1 >1.5w2 and 4c2 >c1 >1.5c2 .
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公开(公告)号：DE69800019T2
公开(公告)日：2000-05-25
申请号：DE69800019
申请日：1998-02-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI YUAN P
Abstract: The optical device (201) includes a transition region (22) which is immediately adjacent to the slab waveguide (20) and which has n silica paths that intersect an output waveguide array where n>10. The silica paths progressively narrow as they become further away from the slab waveguide. The slab waveguide and the output waveguide array each comprise a light-carrying (core) material whose index of refraction is equal to the index of refraction of the silica paths. The separation between each pair of silica paths has a lower index of refraction than the silica paths. The widths of the separation gaps increases as they become further away from the slab waveguide. The silica paths are parallel to each other. The silica paths are perpendicular to the output waveguide array. The optical device comprises a star coupler with several input waveguides (25) and several output waveguides (26) or a branch power splitter with a single input waveguide and several output waveguides.
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