Optical waveguide device and module

Patent metadata

Field	Value
Publication number	US-9020307-B2
Application number	US-201013511118-A
Country	US
Kind code	B2
Filing date	Nov 26, 2010
Priority date	Nov 26, 2009
Publication date	Apr 28, 2015
Grant date	Apr 28, 2015

Abstract

In a waveguide device, unnecessary optical power is appropriately terminated. According to an embodiment of the present invention, the waveguide device has a termination structure filled with a light blocking material to terminate light from a waveguide end. In the termination structure, a cladding and a core are removed to form a groove on an optical waveguide. The groove is filled with a material (light blocking material) that attenuates the intensity of light. Thus, light input to the termination structure is attenuated by the light blocking material, suppressing crosstalk which possibly effects on other optical devices. Thus, such a termination structure can restrain crosstalk occurred in optical devices integrated in the same substrate and can also suppress crosstalk which possibly effects on any other optical device connected directly to the substrate.

First claim

The invention claimed is:

1. A waveguide device, comprising:
a termination structure comprised of a light blocking material, the light blocking material bounding a passageway extending longitudinally thereinto to an end face;
a waveguide having a terminal end comprising a taper portion with a waveguide width decreasing toward a terminal point, the terminal end of the waveguide being positioned within the passageway, a gap being formed by the passageway longitudinally between the terminal point of the waveguide and the end face of the passageway, the gap having a transversal width greater at the end face than at the terminal point of the waveguide;
wherein light from the waveguide enters the light blocking material through the end face of the passageway at an oblique incidence angle.

2. The waveguide device according to claim 1 , wherein a taper angle of the taper portion is substantially equal to or smaller than a critical angle at which adiabatic transition occurs.

3. The waveguide device according to claim 1 , wherein the angle of incidence is substantially equal to or larger than a Brewster's angle.

4. The waveguide device according to claim 1 wherein the light blocking material comprises a material that absorbs or scatters light from the terminal end of the waveguide.

5. The waveguide device according to claim 1 , comprising:
at least one of a Mach Zehnder optical switch, a variable attenuator, an optical splitter, and an arrayed waveguide grating.

6. A module obtained by multichip integration using waveguide devices according to claim 1 .

7. The waveguide device recited in claim 1 , wherein the end face is planar.

8. The waveguide device recited in claim 7 , wherein the passageway is bounded by a side face extending from the end face, a curved corner connecting the end face to the side face.

9. The waveguide device recited in claim 8 , wherein the curved corner is positioned such that light from the waveguide cannot be directly incident on the curved corner.

Assignees

• Ishikawa Takanori
• Shibazaki Tomoyo
• Nagano Mitsuru
• Yanagisawa Masahiro
• Terui Hiroshi
• Itoh Mikitaka
• Ntt Electronics Corp
• Nippon Telegraph & Telephone

Inventors

• Ishikawa Takanori
• Shibazaki Tomoyo
• Nagano Mitsuru
• Yanagisawa Masahiro
• Terui Hiroshi
• Itoh Mikitaka

Classifications

• G02B6/2552

  reshaping or reforming of light guides for coupling using thermal heating, e.g. tapering, forming of a lens on light guide ends · CPC title

• G02B6/12019 Primary

  characterised by the optical interconnection to or from the AWG devices, e.g. integration or coupling with lasers or photodiodes (coupling integrated waveguide to fibre G02B6/30, to optoelectronic element G02B6/42; monolithic integration of integrated waveguides with other optical elements G02B6/12004) · CPC title

• G02B6/30 Primary

  for use between fibre and thin-film device · CPC title

• G02B6/305

  and having an integrated mode-size expanding section, e.g. tapered waveguide · CPC title

• G02B6/12

  of the integrated circuit kind (electric integrated circuits H10B, H10D84/00 - H10D89/00, H10F19/00, H10F39/00, H10H29/00, H10K19/00, H10K39/00, H10K59/00, H10N19/00, H10N39/00, H10N59/00, H10N69/00, H10N79/00, H10N89/00) · CPC title