# US 7,466,502 B2 · Optical wavelength division coupler and associated methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,466,502 B2 - Document ID: US7466502B2 - Status: Granted - Kind: B2 - Application number: 11/295,720 - Filed: 2005-12-07 - Published: 2008-01-17 - Granted: 2008-12-16 - Earliest claimed: 2005-12-07 - Assignees: Tessera North America, Inc. - Inventors: James E. Morris; Hongtao Han; Adam Fedor; Robert TeKolste; Jay Mathews; Michael R. Feldman - Web page: https://patentgrep.com/patent/US7466502B2 ## CPC - G02B 6/29367: {Zigzag path within a transparent optical block, e.g. filter deposited on an etalon, glass plate, wedge acting as a stable spacer} - G02B 6/2938: {for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM} - G02B 6/4206: {Optical features (G02B6/4207, G02B6/421 take precedence)} - G02B 6/4214: {the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device (G02B6/4246 takes precedence)} - G02B 6/4215: {the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers (G02B6/4246 takes precedence)} - G02B 6/4246: {Bidirectionally operating package structures} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An optical assembly includes a first transparent substrate having first and second surfaces, a second transparent substrate having substantially parallel third and fourth surfaces, a reflective portion on the second transparent substrate, a plurality of filters between the first substrate and the reflective portion, the plurality of filters filtering light beams incident thereon, the plurality of filters and the reflective portion forming a bounce cavity within the second transparent substrate, a collimating lens for collimating light beams to be input to the bounce cavity, a tilt mechanism for introducing tilt to light beams input to the bounce cavity; an input port receiving light beams and an output port transmitting light beams. The tilt mechanism may be between the first and second substrate. ## Claims ### Claim 1 An optical assembly, comprising: a first transparent substrate having first and second surfaces; a second transparent substrate having substantially parallel third and fourth surfaces; a reflective portion on the second transparent substrate; a plurality of filters between the first substrate and the reflective portion, the plurality of filters filtering light beams incident thereon, the plurality of filters and the reflective portion forming a bounce cavity within the second transparent substrate; a mechanism accurately aligning the plurality of filters to a predetermined angle relative to the reflective portion; an input port for receiving light beams on one of the first and second substrates; an output port for transmitting light beams on one of the first and second substrates; and means for introducing tilt to the light beams input to the bounce cavity. ### Claim 2 (depends on 1) The optical assembly of claim 1, wherein the mechanism includes, for each filter of the plurality of filters, a standoff between the filter and a mount surface, the standoff contacting only a portion of the filter. ### Claim 3 (depends on 2) The optical assembly of claim 2, wherein the standoffs include at least two stand-offs formed in position and heights in order to set the alignment of the filter to a pre-determined value. ### Claim 4 (depends on 1) The optical assembly of claim 1, further comprising: a collimating lens for collimating light beams to be input to the bounce cavity. ### Claim 5 (depends on 4) The optical assembly as claimed in claim 4, wherein one of the input port and output port is a transparent portion on the fourth surface. ### Claim 6 (depends on 4) The optical assembly as claimed in claim 4, wherein the means for introducing tilt is between the first surface and the second substrate. ### Claim 7 (depends on 6) The optical assembly as claimed in claim 6, wherein the means for introducing tilt includes a plurality of lithographs. ### Claim 8 (depends on 6) The optical assembly as claimed in claim 6, wherein the means for introducing tilt is a plurality of prisms. ### Claim 9 (depends on 4) The optical assembly as claimed in claim 4, further comprising a diffractive lens on a surface on which the plurality of filters is secured. ### Claim 10 (depends on 9) The optical assembly as claimed in claim 9, further comprising an adhesive material filling the diffractive lens and securing the plurality of filters. ### Claim 11 (depends on 4) The optical assembly as claimed in claim 4, wherein the means for introducing tilt is between the input port and the plurality of filters. ### Claim 12 (depends on 4) The optical assembly as claimed in claim 4, wherein the fourth surface is planar. ### Claim 13 (depends on 11) The optical assembly as claimed in claim 11, wherein the input port and the output port are on the first substrate. ### Claim 14 (depends on 1) The optical assembly as claimed in claim 1, wherein the means for introducing tilt is a plurality of prisms. ### Claim 15 (depends on 1) The optical assembly as claimed in claim 1, wherein the means for introducing tilt is a plurality of diffractive elements. ### Claim 16 (depends on 1) The optical assembly as claimed in claim 1, wherein the means for introducing tilt is a sloped surface. ### Claim 17 A method of making an optical subassembly, comprising: providing a first transparent substrate having first and second surfaces; providing a second transparent substrate having substantially parallel third and fourth surfaces; providing a reflective portion on the second transparent substrate, forming a bounce cavity within the second transparent substrate; providing a plurality of filters between the first substrate and the bounce cavity; providing a mechanism accurately aligning the plurality of filters in a direction that is a predetermined angle relative to the reflective portion; and providing means for introducing tilt to the light beams input to the bounce cavity. ### Claim 18 (depends on 17) The method as claimed in claim 17, further comprising die bonding the plurality of filters to the second substrate and then die bonding the second substrate to the plurality of filters. ### Claim 19 (depends on 17) The method as claimed in claim 17, further comprising securing the fourth surface on a die mount and bonding the plurality of filters to the third surface. ### Claim 20 (depends on 19) The method as claimed in claim 19, further comprising, before bonding, providing stand-offs for aligning the plurality of filters on the third surface. ### Claim 21 (depends on 20) The method as claimed in claim 20, wherein providing the stand-offs includes lithographically forming features. ### Claim 22 (depends on 20) The method as claimed in claims 20, further comprising providing an adhesive material on the third surface, including on the stand-offs. ### Claim 23 (depends on 22) The method as claimed in claim 22, wherein bonding includes contacting the filters to the adhesive material at room temperature and heating the second substrate. ### Claim 24 (depends on 1) The optical assembly as claimed in claim 1, wherein the means for introducing tilt is between the first and second substrates. ### Claim 25 (depends on 1) The optical assembly as claimed in claim 1, wherein the mechanism includes integrating each filter onto a surface of one of the first and second substrates. ### Claim 26 (depends on 2) The optical assembly as claimed in claim 2, wherein the stand-offs are the means for introducing tilt. ### Claim 27 (depends on 1) The optical assembly as claimed in claim 1, wherein the predetermined angle is substantially zero. ### Claim 28 (depends on 1) The optical assembly as claimed in claim 1, wherein the predetermined angle is greater than zero.