Free-space angle-multiplexed optical interconnect network

• US 5,781,671 A
• Filed: 10/04/1995
• Issued: 07/14/1998
• Est. Priority Date: 10/04/1995
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Research Institute, Inc. (NEC Corporation)
• Inventors: Wang, Ting, Li, Yao, Linke, Richard A.
• Primary Examiner(s): Bovernick, Rodney B.
• Assistant Examiner(s): Song, Yisun
• Application Number:
  US08/539,154
• Time in Patent Office: 1,014 Days
• Field of Search: 385/17, 250/208.2, 250/208.4, 359/117, 359/115, 359/139, 359/561, 359/569, 359/35, 372/50, 365/127
• US Class Current: 385/17
• CPC Class Codes: H04B 10/803 Free space interconnects, e.g. between circuit boards or chips

Abstract

A point-to-point optical network for interconnecting processing elements uses a two-dimensional array of chips, each of which includes a two-dimensional array of lasers that are used to target a two-dimensional array of photodetectors. A two-dimensional array of lenslets together with a spherical lens are used to focus light from a laser in the j, k position in any one of the laser arrays in any one of the chips on the particular photodetector in the j,k position in the photodetector array.

Claims

1. A point-to-point optical interconnection network for coupling a predetermined transmitting element contained within an array of arrays of transmitting elements with a predetermined receiving element contained within an array of receiving elements, said interconnection network comprising:

a two-dimensional coplanar chip array (12) of coplanar two-dimensional arrays (13) of vertical cavity surface emitting lasers (14);

a coplanar two-dimensional array of photodetectors (18);

said photodetectors (18) being positionally associated with said lasers such that a laser at the j, k position in any of said arrays (13) corresponds with a photodetector at the j, k position in said array of photodetectors (18); and

a holographic imager, disposed between said coplanar two-dimensional chip array and said two-dimensional coplanar array of photodetectors such that light emitted from the laser at the j, k position in any of said two-dimensional arrays (13) of vertical cavity surface emitting lasers (14) is received only at the photodetector in the j, k positions of said array of photodetectors.

2. A point-to-point optical interconnection network as set forth in claim 1, further comprising transmitting processing elements, each transmitting processing element being associated with a different chip in said chip array for causing a laser at a predetermined position or positions in a predetermined array of lasers to transmit light through said holographic imager to a corresponding one or ones of said photodetectors in said array of photodetectors either individually or in parallel.

3. A point-to-point optical interconnection network for coupling a predetermined transmitting element contained within an array of arrays of transmitting elements with a predetermined receiving element contained within an array of receiving elements, said interconnection network comprising:

a two-dimensional coplanar chip array (12) of coplanar two-dimensional arrays (13) of vertical cavity surface emitting lasers (14);

a coplanar two-dimensional array of photodetectors (18);

said photodetectors (18) being positionally associated with said lasers such that a laser at the j, k position in any of said two-dimensional arrays (13) corresponds with a photodetector at the j, k position in said array of photodetectors (18); and

an imager, disposed between said two-dimensional coplanar chip array and said two-dimensional array of photodetectors, said imager including a two-dimensional array of lenslets disposed between said chip array and said array of photodetectors and a macrolens disposed between said two-dimensional array of lenslets and said array of photodetectors such that light emitted from the vertical cavity surface emitting laser in the j, k position in any of said two-dimensional arrays (13) of vertical cavity surface emitting lasers (14) is first collimated by the lenslet in the array of lenslets corresponding to said any of said two-dimensional arrays (13) and then focused into a two-dimensional beam of light by said macrolens such the light emitted is received only at the photodetector in the j, k position of said array of photodetectors.

4. A point-to-point optical interconnect network as set forth in claim 3, where said macrolens is a spherical lens.

5. A point-to-point optical interconnection network as set forth in claim 3, further comprising transmitting processing elements, each transmitting processing element being associated with a different chip in said chip array for causing a laser at a predetermined position or positions in a predetermined array of lasers to transmit light through said imager to a corresponding one or ones of said photodetectors in said array of photodetectors either individually or in parallel.