WO2018009853A1 - Techniques permettant de réduire la surface d'occupation d'un sous-ensemble optique d'émetteur à canaux multiples (tosa) à l'intérieur d'un boîtier d'émetteur-récepteur optique - Google Patents

Techniques permettant de réduire la surface d'occupation d'un sous-ensemble optique d'émetteur à canaux multiples (tosa) à l'intérieur d'un boîtier d'émetteur-récepteur optique Download PDF

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Publication number
WO2018009853A1
WO2018009853A1 PCT/US2017/041178 US2017041178W WO2018009853A1 WO 2018009853 A1 WO2018009853 A1 WO 2018009853A1 US 2017041178 W US2017041178 W US 2017041178W WO 2018009853 A1 WO2018009853 A1 WO 2018009853A1
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WO
WIPO (PCT)
Prior art keywords
sidewall
tosa
housing
mounting region
recessed mounting
Prior art date
Application number
PCT/US2017/041178
Other languages
English (en)
Inventor
Kaisheng LIN
Hao-Hsiang Liao
Yong-Xuan Liang
Original Assignee
Applied Optoelectronics, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US15/204,174 external-priority patent/US20170063465A1/en
Application filed by Applied Optoelectronics, Inc. filed Critical Applied Optoelectronics, Inc.
Priority to CN201780041882.8A priority Critical patent/CN109477757A/zh
Publication of WO2018009853A1 publication Critical patent/WO2018009853A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40—Transceivers

Definitions

  • the present disclosure relates generally to optical subassemblies, and more particularly, to a transmitter optical subassembly (TOSA) housing having a stepped-profile along one or more sidewalls to provide a recessed mounting region to couple to optical assemblies, such as laser diode assemblies, and limit the overall footprint of the TOSA within an optical transceiver housing.
  • TOSA transmitter optical subassembly
  • Optical transceivers are used to transmit and receive optical signals for various applications including, without limitation, internet data center, cable TV broadband, and fiber to the home (FTTH) applications.
  • Optical transceivers provide higher speeds and bandwidth over longer distances, for example, as compared to transmission over copper cables.
  • the desire to provide higher speeds in smaller optical transceiver modules for a lower cost has presented challenges, for example, with respect to maintaining optical efficiency (power), thermal management, insertion loss, and manufacturing yield.
  • FIG. 1A is a side plan view of one approach to a multi-channel TOSA with multiple TO can laser packages.
  • FIG. IB is a side plan view of another approach to a multi-channel TOSA with multiple opposing TO can laser packages.
  • FIG. 2 schematically illustrates an embodiment of an optical transceiver including a multi-channel TOSA and multi-channel receiver optical subassembly (ROSA).
  • ROSA receiver optical subassembly
  • FIG. 3 is a perspective view of an example small form-factor (SFF) pluggable transceiver with a multi-channel TOSA including TO can laser packages and a multi-channel ROSA, in accordance with an embodiment of the present disclosure.
  • SFF small form-factor
  • FIG. 4A is a cross-sectional view of an example multi-channel TOSA housing shown in FIG. 3, in accordance with an embodiment of the present disclosure.
  • FIG. 4B is an example plan view of the multi-channel TOSA housing shown in FIG. 3, in accordance with an embodiment of the present disclosure.
  • FIG. 4C is side plan view of the multi-channel TOSA of FIG. 3, in accordance with an embodiment of the present disclosure.
  • FIG. 4D is a cross-sectional view of the multi-channel TOSA of FIG. 4C taken along the line A-A, in accordance with an embodiment of the present disclosure.
  • FIG. 5 shows an exploded view of the multi-channel TOSA of FIG. 3, in accordance with an embodiment of the present disclosure.
  • FIG. 6A shows a plan view of a first sidewall of the multi-channel TOSA of FIG. 3, in accordance with an embodiment of the present disclosure.
  • FIG. 6B shows a plan view of a second sidewall of the multi-channel TOSA of FIG. 3, in accordance with an embodiment of the present disclosure DETAILED DESCRIPTION
  • SFF optical transceiver housings such as SFF pluggable (SFFP) transceiver housings
  • SFF pluggable (SFFP) transceiver housings include dimensions in the tens of millimeters or less, for example, and thus provide relatively constrained housings for associated transmitter optical subassemblies (TOSAs) and receiver optical subassemblies (ROSAs).
  • TOSAs transmitter optical subassemblies
  • ROSAs receiver optical subassemblies
  • Subassemblies designed to fit within such constrained housings can complicate manufacturing processes and present non-trivial issues.
  • TOSAs such as the TOSA shown in FIG. 1A, may include a relatively small dimension 106 between adjacent TO can laser packages (or assemblies) 104b and 104c.
  • the multi-channel TOSA 100 includes four (4) TO can laser packages 104a- 104d, three (3) of which are arranged coupled to a first sidewall 120 of the housing 102.
  • post attachment alignment of TO can laser packages 104a-c using, for instance, a laser welding system may be complicated, error-prone, and time-consuming due to the relatively limited range of available approach angles a, which arise from the constraints imposed by the dimension 106. Therefore, in some TOSAs it may be desirable to have one or more optical assemblies coupled to the TOSA housing in an opposing configuration, such as shown in the example embodiment of FIG. IB, which will be discussed in greater detail below.
  • An example TOSA with an opposing TO can laser package configuration is also discussed in detail in co-pending '993 Application.
  • While such an opposing TO can configuration may provide various advantages, e.g., providing additional space for post- attachment alignment of the optical assemblies coupled to the TOSA housing via welding, it may also result in the overall footprint of the TOSA being increased relative to a TOSA having a non-opposing configuration, such as shown in the example TOSA 100 of FIG. 1 A.
  • a transmitter optical subassembly (TOSA) 302 is disposed in a first region of a cavity defined by the SFF housing 202
  • a receiver optical subassembly (ROSA) 230 is disposed in a second region of the cavity defined by the SFF housing 202.
  • the opposing configuration of the TOSA 302, and more particularly, the pins of the TO can laser package 304c extend toward and make contact with a surface of the ROSA 230. Such contact may result in operational interference between the TOSA 302 and the ROSA 230, e.g., resulting in an electrical short or RF interference, and may also further complicate attachment of associated circuitry to the pins of the TO laser package 304c, e.g., a flexible printed circuit board. Even in configurations without an opposing TO can configuration, TOSAs and other subassemblies may include footprints that complicate the design and manufacture of optical transceiver housings.
  • a TOSA having a housing with a stepped-profile along at least one sidewall to reduce the overall footprint of a TOSA includes a housing having a plurality of sidewalls, wherein a first sidewall of the plurality of sidewalls defines first and second step portions, and a first recessed mounting region disposed there between.
  • the first and second step portions may also be described as shoulder portions.
  • the first recessed mounting region includes at least a first and second sidewall opening for receiving and coupling to an optical assembly, such as a TO can laser assembly, a filter assembly, or a mirror assembly, just to name a few.
  • a second sidewall of the plurality of sidewalls of the housing may also define third and fourth step portions and a second recessed mounting region disposed there between.
  • the second sidewall may be disposed opposite the first sidewall and, by extension, the second recessed mounting region may oppose the first recessed mounting region.
  • the second recessed mounting region includes at least a third sidewall opening for receiving an optical assembly.
  • the third sidewall opening is positioned opposite the first and second sidewall openings, and is generally located at a mid-point between the first and second sidewall openings.
  • the optical assemblies are positioned within a respective recessed mounting region in a staggered and opposing configuration.
  • the TOSA housing can include a reduced footprint along at least one dimension measured from an outer surface of the first recessed region to an outer surface of the second recessed region.
  • various aspects and embodiments discussed herein include a TOSA housing having recessed regions disposed in an opposing fashion, this disclosure is not necessarily limited in this regard.
  • the TOSA housing may include recessed regions on any number of sidewalls including a single sidewall, multiple sidewalls, and multiple opposing sidewalls, depending on a desired configuration.
  • the inclusion of one or more recessed mounting regions in the TOSA housing advantageously allows for the overall footprint of the TOSA to be reduced relative to the extent of the recess.
  • step portions associated with the one or more recessed mounting regions may also provide a suitable mounting point for optical assemblies to mount to sidewalls that adjoin the one or more sidewalls that provide recessed mounting regions.
  • the step portions 450 and 454 adjacent the recessed mounting regions 406 and 407, respectively may advantageously allow for the fourth TO can laser assembly 304d to couple to the housing 301 of the TOSA 302.
  • the staggered and opposing configuration may increase the overall footprint of the TOSA, e.g., by virtue of pins from TO can laser assemblies extending out from multiple sidewalls, the inclusion of one or more recessed mounting regions minimizes or otherwise reduces the magnitude of the increase in the overall footprint of the TOSA.
  • a TOSA housing having one or more recessed mounting regions allows the same to have any number of TO can placement configurations, e.g., an opposing placement as shown in FIG. IB, a non-opposing placement as shown in FIG. 1A, and so on, while comporting with the physical constraints of a particular optical transceiver housing.
  • a TO can laser package represents one suitable type of optical assembly that can be used herein and other optical assemblies including, for example, one or more, filters, mirrors, laser diodes, lenses, diffusers, polarizers, prisms, beam splitters, diffraction gratings, and other similar assemblies that may undesirably increase the footprint of an optical subassembly when coupled thereto may also be used.
  • optical assemblies including, for example, one or more, filters, mirrors, laser diodes, lenses, diffusers, polarizers, prisms, beam splitters, diffraction gratings, and other similar assemblies that may undesirably increase the footprint of an optical subassembly when coupled thereto may also be used.
  • ROSA receiver optical subassembly
  • channel wavelengths refer to the wavelengths associated with optical channels and may include a specified wavelength band around a center wavelength.
  • the channel wavelengths may be defined by an International Telecommunication (ITU) standard such as the ITU-T dense wavelength division multiplexing (DWDM) grid.
  • ITU International Telecommunication
  • DWDM dense wavelength division multiplexing
  • Coupled refers to any connection, coupling, link or the like and “optically coupled” refers to coupling such that light from one element is imparted to another element. Such “coupled” devices are not necessarily directly connected to one another and may be separated by intermediate components or devices that may manipulate or modify such signals.
  • the optical transceiver 200 transmits and receives four (4) channels using four different channel wavelengths ( ⁇ , ⁇ 2 , ⁇ 3 , ⁇ 4 ) and may be capable of transmission rates of at least about 10 Gbps per channel.
  • the channel wavelengths ⁇ , ⁇ 2 , ⁇ 3 , ⁇ 4 may be 1270 nm, 1290 nm, 1080 nm, and 1330 nm, respectively.
  • the optical transceiver 200 may also be capable of transmission distances of 2 km to at least about 10 km.
  • the optical transceiver 200 may be used, for example, in internet data center applications or fiber to the home (FTTH) applications.
  • the optical transceiver 200 implements the specification SFF-8436 titled "QSFP+ 10 Gbs 4X PLUGGABLE TRANSCEIVER Rev 4.8" (hereinafter QSFP+), published on October 31, 2013, by the Electronic Industries Alliance (EIA).
  • This embodiment of the optical transceiver 200 includes a multi-channel TOSA 302 for transmitting optical signals on different channel wavelengths and a multi-channel receiver optical subassembly (ROSA) 230 for receiving optical signals on different channel wavelengths.
  • the multi-channel TOSA 302 and the multi-channel ROSA 230 are located in a transceiver housing 202.
  • a transmit connecting circuit 204 and a receive connecting circuit 208 provide electrical connections to the multi-channel TOSA 302 and the multi-channel ROSA 230, respectively, within the housing 202 and communicate with external systems via data bus 203.
  • data bus 203 is a 38-pin connector that comports with physical connector QSFP standards and data communication protocols.
  • the transmit connecting circuit 204 is electrically connected to the electronic components (e.g., TO can laser packages) in the multi-channel TOSA 302, and the receive connecting circuit 208 is electrically connected to the electronic components (e.g., the photodiode packages) in the multi-channel ROSA 230.
  • the transmit connecting circuit 204 and the receive connecting circuit 208 include at least conductive paths to provide electrical connections and may also include additional circuitry.
  • the multi-channel TOSA 302 transmits and multiplexes multiple channel wavelengths and is coupled to an optical interface port 212.
  • the optical interface port 212 may comprise an LC connector receptacle, although other connector types are also within the scope of this disclosure.
  • the optical interface port 212 may comprise a multi-fiber push on (MPO) connector receptacle.
  • MPO multi-fiber push on
  • the LC connector receptacle provides optical connections to the multi-channel TOSA 302, and provides optical connections to the multi-channel ROSA 230.
  • the LC connector receptacle may be configured to receive and be coupled to a mating LC connector 214 such that the transmit optical fiber 222 of the external fibers 224 optically couples to the multi-channel TOSA 302, and the receive optical fiber 217 of the external fibers 224 optically couples to the multi-channel ROSA 230.
  • the multi-channel TOSA 302 includes multiple TO can laser packages, discussed in greater detail below, and optics for producing assigned channel wavelengths and coupling the same into the transmit optical fiber 222.
  • the lasers in the multi-channel TOSA 302 convert electrical data signals (TX_D1 to TX_D4) received via the transmit connecting circuit 204 into modulated optical signals transmitted over the transmit optical fiber 222.
  • the lasers may include, for example, distributed feedback (DFB) lasers with diffraction gratings.
  • the multi-channel TOSA 302 may also include monitor photodiodes for monitoring the light emitted by the lasers.
  • the multi-channel TOSA 302 may further include one or more temperature control devices, such as a resistive heater and/or a thermoelectric cooler (TEC), for controlling a temperature of the lasers, for example, to control or stabilize the laser wavelengths.
  • TEC thermoelectric cooler
  • the multi-channel ROSA 230 includes, for example, photodiodes, mirrors and filters that can de-multiplex different channel wavelengths in a received optical signal.
  • the multichannel ROSA 230 can detect, amplify, and convert such optical signals received from the external optical fibers 224, and can provide the converted optical signals as electrical data signals (RX_D1 to RX_D4) that are output via the receive connecting circuit 208.
  • This embodiment of the optical transceiver 200 includes 4 channels and may be configured for coarse wavelength division multiplexing (CWDM), although other numbers of channels are within the scope of this disclosure.
  • CWDM coarse wavelength division multiplexing
  • an example small form-factor (SFF) pluggable optical transceiver 300 with a multi-channel TOSA including TO can laser packages and multi-channel ROSA is described and shown in greater detail.
  • the embodiment shown in FIG. 3 is one example of the optical transceiver 200 of FIG. 2 implemented in a small form-factor.
  • the optical transceiver 300 may implement the QSFP+ specification.
  • the optical transceiver 300 includes the transceiver housing 202, a multi-channel TOSA 302 in one region of the housing 202, and a multi-channel ROSA 230 located in another region of the housing 202.
  • the TO can laser package 304c of the multi-channel TOSA 302 directly contacts a surface of the ROSA 230.
  • the multi-channel TOSA 302 is electrically connected to transmit flexible printed circuits (FPCs) 311 and optically coupled to the LC connector port 212 at an end of the housing 202.
  • the multi-channel ROSA 230 is electrically connected to a receive flexible printed circuit (FPC) 309 and optically coupled to the LC connector port 212 at the end of the housing 202.
  • the multi-channel TOSA 302 includes TO can laser packages 304a, 304b, 304c, and 304d, with each containing optical components (or optical component assemblies) such as a laser diode.
  • the TO can laser packages 304a-304d can provide, for example, output power from 1.85mW to 2W, although other output power is within the scope of this disclosure.
  • the TO can laser packages 304a-304d may provide a broad spectrum of channel wavelengths, or configured to provide a relatively narrow spectrum of channel wavelengths such as a single channel wavelength. In some cases, the TO can laser packages 304a-304d provide center wavelengths 375 nm to 1650 nm, for example.
  • the TO can laser packages 304a-304d are 03.8 mm, 05.6 mm, or 09 mm TO cans, although other configurations are also within the scope of this disclosure.
  • the TO can laser packages 304a-304d can include 09.5 mm and TO-46 cans.
  • the multi-channel TOSA 302 includes TO can laser packages 304a-304d within a recessed mounting region and coupled in a staggered manner, with TO can laser package 304c being disposed on an opposing sidewall to that of TO can laser packages 304a and 304b, as discussed in greater detail below.
  • the multi-channel TOSA 302 may further include one or more recessed mounting regions, as discussed in greater detail below, that allow the multi-channel TOSA 302 to have a relatively reduced overall footprint within an optical transceiver housing.
  • FIG. 4A a cross-sectional view of an example housing 301 for the multi-channel TOSA 302 of FIG. 3 is shown in accordance with an embodiment of the present disclosure.
  • the housing 301 includes first and second sidewalls 308 and 310, respectively, positioned on opposite sides of the housing 301 and extending generally in parallel along a longitudinal axis 303 from a first end 326 to a second end 327.
  • the housing 301 further provides a cavity (or compartment) 316.
  • the first sidewall 308 includes at least first and second sidewall openings 404a and 404b
  • the second sidewall 310 includes at least a third sidewall opening 404c being positioned generally at a midpoint axis 307 of the housing 301.
  • the midpoint axis 307 may extend from the first sidewall 308 to the second sidewall 310 and between the first and second sidewall openings 404a and 404b of the first sidewall 308. In some instances, the midpoint axis 307 may be located at a center of the housing 301.
  • the first and second sidewall openings 404a and 404b transition from an external surface 408 of the first sidewall 308 and into the cavity 316.
  • the third sidewall opening 404c transitions from an external surface 409 of the second sidewall 310 and into the cavity 316.
  • a side plan view of the housing 301 of FIG. 4A includes hidden lines generally illustrating various internal structural features of the housing 301, in accordance with an embodiment of the present disclosure.
  • a first recessed mounting region 406 is defined by the external surface 408 of the first sidewall 308 and extends between the first end 326 and second end 327 of the housing 301.
  • the first end 326 may define a first step portion 450 and the second end 327 may define a second step portion 452.
  • the first and second step portion 450 and 452 include a respective external surface 414 and 416 coupled to a respective one or more sidewalls 423 and 424 extending in an upward direction away from the external surface 408 of the first sidewall 308.
  • the respective one or more sidewalls 423 and 424 may be adjacent to a portion of the external surface 408 that defines the first recessed mounting region 406. Accordingly, the first recessed region 406 extends between the first step portion 450 and the second step portion 452 and may include the first and second sidewall openings 404a and 404b.
  • the housing 301 may comprise a metal, an alloy, a plastic, or any other suitably rigid material.
  • the housing 301 may comprise multiple segments or be formed from a single segment.
  • the step portions such as the step portions 450, 452, 454, and 456, are integrally formed with the housing 301.
  • the step portions 450 and 452 may be formed by casting, milling, or other similar approaches.
  • the step portions 450, 452, 454, and 456 may be separate segments added to the housing 301 using, for example, press-fitting, welding, adhesives, or other approaches to fixation.
  • the external surface (or surface) 414 of the first step portion 450 is offset from the external surface 408 of the first recessed mounting region 406 by a first offset distance 412.
  • the external surface (or surface) 416 of the second step portion 452 is offset from the external surface 408 of the first recessed mounting region by a second offset distance 418.
  • the first offset distance 412 and the second offset distance 418 may measure substantially the same distance, or may measure different distances depending on a desired configuration.
  • the first offset distance 412 and/or the second offset distance 418 may measure 0.15 millimeters (mm), 0.3mm, 0.45mm, 0.6mm, 1.0mm, 1.5mm, any range of measurements there between, or any other desired measurement.
  • the first and second offset distances 412 and 418 of the first recessed mounting region 406 may result in a recessed mounting region thickness 420 being less than an overall step thickness 422. Stated differently, the reduction in thickness measured at 420 may be directly proportional to the offset distances 412 and 418 that, in a general sense, counter-sink the first recessed mounting region 406 into the housing 301.
  • the first recessed mounting region 406 may be configured to couple optical components such as TO can laser assemblies to the first and second openings 404a and 404b.
  • the first recessed mounting region 406 may be further configured to couple to other optical components by way of additional openings, such as the opening 460 of FIG. 4A, for example.
  • the housing 301 may define the third and fourth step portions (or step regions) 454 and 456 and a second recessed mounting region 407 extending there between.
  • the second recessed mounting region 407 may be defined by the external surface 409 of the second sidewall 310 that is offset from at least one of an external surface 442 or an external surface 444 of the third and fourth step regions 454 and 456 by a third offset distance 441 and/or fourth offset distance 443, respectively.
  • the second recessed mounting region 407 may include the third sidewall opening 404c.
  • the step portions 454 and 456 and second recessed mounting region 407 may be configured to be substantially similar to the step portions 450 and 452 and the first recessed region 406.
  • the third and fourth offset distances 441 and 443 may measure substantially the same as offset distances 412 and 418, although other embodiments are within the scope of this disclosure.
  • the third and fourth offset distances 441 and 443 may measure substantially equal to each other, but may also measure less than or greater than the offset distances 412 and 418.
  • each of the first and second recessed mounting regions 406 and 407 may include substantially the same configuration such that the housing 301 is substantially symmetric about the longitudinal axis 303 and/or about the midpoint axis 307.
  • a symmetrical recessed mounting configuration is not necessarily required and each recessed mounting region 406 and 407 may include different configurations. Further, as shown collectively in the example embodiments of FIGs.
  • the first offset distance 412, the second offset distance 418, the third offset distance 441, and/or the fourth offset distance 443 may measure equal to a thickness of the one or more welding rings 402a-402d.
  • the first and second recessed mounting regions 406 and 407 are shown with a generally planar (or flat) configuration. However, the first and second recessed mounting regions 406 and 407 may be configured with non-planar surfaces and this disclosure should not be limited in this regard.
  • first and second TO can laser packages 304a and 304b are shown coupled to the first and second sidewall openings 404a and 404b of the first sidewall 308, respectively, and a third TO can laser package 304c is coupled to the third sidewall opening 404c, with the third sidewall opening 404c opposing the first and second TO can laser packages 304a and 304b.
  • the first recessed mounting region 406 allows the TO can laser packages 304a and 304b to couple to the housing 301 at a position below the surfaces 414 and 416 of the first and second step portions 450 and 452, respectively.
  • the second recessed mounting region 407 allows the third TO can laser assembly 304c to couple to the housing 301 in a similar fashion, e.g., below surfaces defining the third and fourth step portions 454 and 456.
  • the overall width 434 of the TOSA 302 relative to, for example, the overall width 108 of the TOSA 110 of FIG. IB, may be reduced.
  • the resulting overall width 434 of the TOSA 302 may advantageously reduce the overall footprint of the same within a transceiver housing, such as the SFFP transceiver housing 202 of FIG. 3.
  • the first recessed mounting region 406 may have a length 432 measured between the first and second step portions 450 and 452.
  • the length 432 of the first recessed mounting region 406 may be such that the first and second openings 404a and 404b of the first sidewall 308 can receive TO can laser packages 304a and 304b.
  • the length 432 of the first recessed mounting region 406 may be based, at least in part, on a dimension 306 between adjacent TO can laser packages 304a and 304b.
  • the dimension 306 is at least about 3 mm, although other embodiments are within the scope of this disclosure. In other cases, dimension 306 is between 2 mm and 5 mm, for example.
  • the dimension 306 provides component spacing greater than that of other approaches to TOSAs, such as the TOSA 100 shown in FIG. 1A.
  • This increased dimension 306 advantageously allows laser welds to be formed without the cost and complexity normally associated with having tight tolerances between laser packages.
  • an approach angle ⁇ for the laser welding system may be within the range of 30° to 36°.
  • the range of the approach angles ⁇ may include angles less than 30°. Therefore, the range of the approach angles ⁇ may be greater for the TOSA 302 than for other approaches, such as the TOSA 100 of FIG. 1A.
  • FIG. 4C shows the second recessed mounting region 407 having a length substantially equal to the length 432 of the first recessed mounting region 406, other embodiments are within the scope of this disclosure.
  • the length of the second recessed mounting region 407 may be greater than or less than the length 432.
  • the fourth TO can laser package 304d can be coupled to the housing 301 at a third sidewall 312, with the third sidewall 312 adjoining the first and second sidewalls 308 and 310.
  • the third sidewall 312 includes a fourth sidewall opening 404d.
  • the housing 301 may further include an optical coupling receptacle 324 coupled to a fourth sidewall 313 by way of a fifth sidewall opening 404e, the fifth sidewall opening 404e being opposite the fourth sidewall opening 404d.
  • the first and third step portions 450 and 454 advantageously provide structural support for the purposes of coupling to the fourth TO can laser package 304d.
  • the overall step thickness 422 (FIG. 4B) may be of sufficient size such that the fourth TO can laser package 304d can be coupled to the housing 301 by way of the fourth sidewall opening 404d.
  • the second and fourth step portions 452 and 456 may provide the housing 301 with a thickness sufficient to support the coupling of the optical coupling receptacle 324 to the housing 301 by way of the fifth sidewall opening 404e.
  • step portions 450, 452, 454, and 456 of the housing 301 may be sized with dimensions that support attachment of laser packages/optical components at ends of the housing 301. To this end, the dimensions of a particular optical component/assembly may determine the particular overall step thickness 422 of the optical housing.
  • FIG. 4D there is a cross-sectional view of the multi-channel TOSA 302 of FIG. 3 in accordance with an embodiment.
  • the housing 301 also forms the cavity 316, or compartment, that defines a light path 322 that extends through filters 318a, 318b, and 318c, respectively, before encountering a focusing lens 320.
  • the filters 318a-318c are positioned on filter holders 319a, 319b, and 319c, respectively.
  • the optical coupling receptacle 324 extends from the second end 327 for optically coupling the light of TO can laser packages 304a-304d to the transmit optical fiber 222.
  • the filters 318a-318c, the lens 320, and the optical coupling receptacle 324 are generally aligned or positioned along a longitudinal axis provided by the light path 322.
  • This combination of filters may be accurately described as multiplexing optics and can provide coarse wavelength division multiplexing (CWDM) in an optical signal. Multiplexing different channel wavelengths using this configuration will now be discussed in the context of a four (4) channel TOSA configuration, such as shown in Figure 4C.
  • Each of the TO can laser packages 304a-304d can be associated with different channel wavelengths.
  • the channel wavelengths ( ⁇ , ⁇ 2, ⁇ 3, ⁇ 4) associated with TO can laser packages 304a-304d may be 1290 nm, 1330 nm, 1310 nm, and 1270 nm, respectively.
  • the housing includes TO can laser package 304d configured to direct light coaxially along light path 322 into the cavity (or compartment) 316.
  • the filter 318a positioned adjacent the TO can laser package 304d can provide wavelength-dependent transmission such that only the channel wavelength ⁇ , associated with the TO can laser package 304d, passes through filter 318a.
  • the filter 318a may also provide wavelength-dependent reflectivity such that only channel wavelength ⁇ 2 is reflected therefrom.
  • the light along light path 322 includes, essentially, channel wavelengths ⁇ and ⁇ 2.
  • the filter 318c After those channel wavelengths pass through filter 318c, they converge with wavelength ⁇ 3, which is provided by the filter 318c reflecting only channel wavelength ⁇ 3 from the light directed by TO laser package 304c.
  • the light along light path 322 now includes, essentially, channel wavelengths ⁇ , ⁇ 2, and ⁇ 3.
  • channel wavelength ⁇ 4 which is provided by the filter 318b reflecting only channel wavelength ⁇ 4 from the light directed by TO laser package 304b.
  • collimating lenses 305a-305d collimate light emitted by each TO can laser package.
  • the resulting optical signal includes multiple different multiplexed channel wavelengths (e.g., ⁇ , ⁇ 2, ⁇ 3, ⁇ 4) and is optically coupled to the transmit optical fiber 222.
  • the multi-channel TOSA 302 may include additional channels and is not necessarily limited to the four (4) shown in FIG. 4D. That is, additional TO can laser packages may be disposed along the sidewalls of housing 301.
  • the first sidewall 308 may include 3 or more TO can laser packages. Each of those TO can laser packages may be disposed with spacing similar to the embodiment shown in FIG. 4D.
  • TO can laser packages may be coupled such that they are disposed generally coextensive or otherwise overlapping with the area between each of the TO can laser packages of the first sidewall 308. This staggered/opposing arrangement may be repeated for N number of optical channels, depending on a desired configuration.
  • each of the TO can laser packages 304a-304d include an associated welding ring 402a-402d, respectively. These welding rings 402a-402d allow the TO can laser packages 304a-304d to be placed over and coupled to sidewall openings 404a-404d, respectively.
  • laser welding is one approach that is particularly well suited for ensuring optical efficiency (power) and reliable operation over a lifetime of the multi-channel TOSA 302.
  • an outer surface of the filter holder 319b is substantially flat and co-planar with an outer surface of the first sidewall 308. This advantageously provides a generally flat area that does not otherwise obstruct access when attaching TO can laser packages 304a and 304b during manufacturing.
  • FIG. 6A further illustrates how the filter holder 319c is positioned between the first and second step portions 450 and 452 and is substantially coplanar with at least a portion of the external surface 408 of the first sidewall 308 that defines the first recessed mounting region 406.
  • the filter hold 319c resides between TO can laser packages 304a and 304b.
  • FIG. 6B illustrates how filter holders 319a and 319b are between the third and fourth step portions 454 and 456, are generally flat, and generally do not obstruct access to the area around TO can laser package 304c along at least a portion of the external surface 409 of the second sidewall 310 that defines the second recessed region 407.
  • the multi-channel TOSA 302 may have a relatively small size.
  • the long axis of the housing may be 15 mm, or less.
  • the multi-channel TOSA 302 may be formed as one piece or as multiple pieces attached together. Although the illustrated embodiment shows the multi-channel TOSA 302 with a particular shape, other shapes and configurations are also possible. In other embodiments, for example, the housing 301 may be generally cylindrical.
  • a transmitter optical subassembly including a housing including at least a first sidewall and a second sidewall disposed on opposite sides of the housing relative to each other, the first and second sidewalls extending along a longitudinal axis from a first end to a second end of the housing, wherein the housing further includes a first step portion defined by the first sidewall and disposed adjacent the first end of the housing, a first recessed mounting region disposed adjacent the first step portion, the first recessed mounting region defined by an external surface of the first sidewall that extends along the longitudinal axis towards the second end of the housing, the external surface defining the first recessed mounting region being offset from a surface defining the first step portion by a first offset distance, and wherein the first recessed mounting region includes at least a first sidewall opening, the first sidewall opening configured to couple to an optical component assembly.
  • an optical transceiver comprising a transceiver housing, a transmitter optical subassembly (TOSA) having a plurality of transistor outline (TO) can laser packages coupled thereto and located in the transceiver housing for transmitting optical signals at different channel wavelengths, the TOSA comprising a TOSA housing including at least a first sidewall and a second sidewall disposed on opposite sides of the TOSA housing relative to each other, the first and second sidewalls extending along a longitudinal axis from a first end to a second end of the TOSA housing, wherein the TOSA housing further includes first and second step portions defined by the first sidewall and a first recessed mounting region extending there between, the first recessed mounting region being defined by an external surface of the first sidewall that is offset from a surface defining the first step portion by a first offset distance, wherein the first recessed mounting region includes at least a first sidewall opening and a second sidewall opening,
  • an optical transceiver including a housing including at least a first sidewall and a second sidewall disposed on opposite sides of the housing relative to each other, the first and second sidewalls extending along a longitudinal axis from a first end to a second end of the housing and providing a cavity therebetween, wherein the housing comprises a first and second step portion defined by the first sidewall and a first recessed mounting region disposed there between, the first recessed mounting region being defined by an external surface of the first sidewall that is offset from a surface defining the first step portion by a first offset distance, wherein the first recessed mounting region includes at least a first sidewall opening and a second sidewall opening to couple to respective TO can laser packages, a third and fourth step portion defined by the second sidewall and a second recessed mounting region disposed there between, the second recessed mounting region being defined by an external surface of the second sidewall that is offset from a surface defining the third step portion

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

Un mode de réalisation de l'invention concerne un sous-ensemble optique d'émetteur (TOSA) possédant une ou plusieurs régions de montage en creux afin de diminuer la surface d'occupation totale du sous-ensemble optique d'émetteur à l'intérieur d'un boîtier d'émetteur-récepteur optique. Le sous-ensemble optique d'émetteur comprend un boîtier possédant au moins une première paroi latérale et une seconde paroi latérale agencées sur des côtés opposés du boîtier l'une par rapport à l'autre. Le boîtier comprend en outre une première partie étagée définie par la première paroi latérale et une première région de montage en creux s'étendant à peu près à partir de la première partie étagée le long de l'axe longitudinal vers la seconde extrémité. La première région de montage en creux est définie par une surface externe de la première paroi latérale qui est décalée d'une première distance de décalage par rapport à une surface définissant la première partie étagée. La première région de montage en creux comprend au moins une ouverture de paroi latérale servant à un couplage avec des ensembles de composants optiques.
PCT/US2017/041178 2016-07-07 2017-07-07 Techniques permettant de réduire la surface d'occupation d'un sous-ensemble optique d'émetteur à canaux multiples (tosa) à l'intérieur d'un boîtier d'émetteur-récepteur optique WO2018009853A1 (fr)

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CN201780041882.8A CN109477757A (zh) 2016-07-07 2017-07-07 一种用于减少光学收发器内光发射次组件占用空间的装置

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US15/204,174 2016-07-07
US15/204,174 US20170063465A1 (en) 2015-08-27 2016-07-07 Techniques for reducing the footprint of a multi-channel transmitter optical subassembly (tosa) within an optical transceiver housing

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090034915A1 (en) * 2007-07-31 2009-02-05 Sumitomo Electric Industries, Ltd. Optical transceiver with an optical sub-assembly supporter by a holder and a cover
US8622632B2 (en) * 2010-03-19 2014-01-07 Corning Incorporated Small-form-factor fiber optic interface assemblies for electronic devices having a circuit board
US20150256261A1 (en) * 2013-02-06 2015-09-10 Applied Optoelectronics, Inc. Coaxial transmitter optical subassembly (tosa) with cuboid type to laser package and optical transceiver including same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7450858B2 (en) * 2003-12-31 2008-11-11 Intel Corporation Apparatus and method for transmitting and receiving wavelength division multiplexing signals
KR20070050216A (ko) * 2005-11-10 2007-05-15 삼성전자주식회사 양방향 광 송수신기
JP5707600B2 (ja) * 2010-09-22 2015-04-30 住友電工デバイス・イノベーション株式会社 光モジュールおよび光モジュールの製造方法
KR101342097B1 (ko) * 2011-10-26 2013-12-18 한국전자통신연구원 다채널 광모듈
JP5839274B2 (ja) * 2011-11-11 2016-01-06 日立金属株式会社 光モジュール

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090034915A1 (en) * 2007-07-31 2009-02-05 Sumitomo Electric Industries, Ltd. Optical transceiver with an optical sub-assembly supporter by a holder and a cover
US8622632B2 (en) * 2010-03-19 2014-01-07 Corning Incorporated Small-form-factor fiber optic interface assemblies for electronic devices having a circuit board
US20150256261A1 (en) * 2013-02-06 2015-09-10 Applied Optoelectronics, Inc. Coaxial transmitter optical subassembly (tosa) with cuboid type to laser package and optical transceiver including same

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