WO2018170714A1 - Émetteur-récepteur à perte d'insertion de filtre réduite et procédés de fabrication et d'utilisation de celui-ci - Google Patents

Émetteur-récepteur à perte d'insertion de filtre réduite et procédés de fabrication et d'utilisation de celui-ci Download PDF

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Publication number
WO2018170714A1
WO2018170714A1 PCT/CN2017/077427 CN2017077427W WO2018170714A1 WO 2018170714 A1 WO2018170714 A1 WO 2018170714A1 CN 2017077427 W CN2017077427 W CN 2017077427W WO 2018170714 A1 WO2018170714 A1 WO 2018170714A1
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WO
WIPO (PCT)
Prior art keywords
optical signal
optical
outgoing
filter
incoming
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Application number
PCT/CN2017/077427
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English (en)
Inventor
Xiaohui Tang
Jian Yang
Yong Zhang
Original Assignee
Source Photonics (Chengdu) Company Limited
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.)
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Application filed by Source Photonics (Chengdu) Company Limited filed Critical Source Photonics (Chengdu) Company Limited
Priority to CN201780000356.7A priority Critical patent/CN107223214A/zh
Priority to PCT/CN2017/077427 priority patent/WO2018170714A1/fr
Publication of WO2018170714A1 publication Critical patent/WO2018170714A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/26—Reflecting filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4286—Optical modules with optical power monitoring
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/381—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres
    • G02B6/3818—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres of a low-reflection-loss type

Definitions

  • the present invention relates to the field of optical communications, especially to optical subassemblies for optical and/or optoelectronic transceivers and methods of making and using the same. More specifically, embodiments of the present invention pertain to methods and apparatuses for reducing power loss due to one or more filters in the optical path of an optical signal.
  • optical signals carry information.
  • a transmitter e.g., alaser or laser diode
  • a receiver e.g., a photodiode
  • One objective of optical communication research and development is to increase and/or maximize bandwidth (e.g., the amount of information transmitted) to the greatest extent possible.
  • Another objective is to communicate the information with as few errors or losses as possible.
  • the optics in an optical or optoelectronic transceiver includes a filter at a 45° angle relative to the incoming optical signal and a photodetector at a 90° angle relative to the incoming optical signal.
  • the filter reflects the incoming optical signal towards the photodetector.
  • FIG. 1 shows such a conventional optical receiver 100, including a lens 110, a mirror 120, a filter 130, and a receiver 140.
  • lens 110 receives an optical signal IN (e.g., from an optical fiber) and provides a focused optical signal 150 to the mirror 120.
  • the mirror 120 then reflects the optical signal 150 to the receiver 140 in the form of a reflected optical signal 155 for further processing.
  • the reflected optical signal 155 may pass through the filter 130 before being received in the receiver 140.
  • the reflected optical signal 155 may be partially or fully polarized (e.g., having electric field vectors in planes at certain angles with reduced amplitudes) .
  • the mirror 120 is replaced with a filter (e.g., awavelength selective filter) .
  • the filter in the path of the optical signal may cause a significant loss in received signal power (e.g., filter insertion loss) .
  • Increasing the power of the received optical signal 150 at the source can exceed the specifications of other components in an optical system (such as an optical network) including the bidirectional optical transceiver.
  • the present invention is intended to overcome one or more deficiencies in the prior art, and provide a bidirectional optical subassembly (BOSA) for an optical and/or optoelectronic transceiver and methods of making and using the same.
  • BOSA bidirectional optical subassembly
  • the present optical subassembly changes the positions and angles of certain components to reduce or minimize filter insertion loss.
  • the optical subassembly includes a photodetector configured convert an incoming optical signal to an incoming electrical signal, a laser diode configured to convert an outgoing electrical signal to an outgoing optical signal, and a passive optical signal processing unit.
  • the passive optical signal processing unit comprises a filter and a mirror.
  • the filter is at a first predetermined angle relative to an optical path of the outgoing optical signal, and is configured to (i) reflect one of the outgoing optical signal and the incoming optical signal and (ii) allow the other of the outgoing optical signal and the incoming optical signal to pass through.
  • the first predetermined angle is adapted to reduce or minimize filter insertion loss relative to the first filter being at an angle of 45° relative to the outgoing optical signal.
  • the mirror is configured to reflect the one of the outgoing optical signal and the incoming optical signal at a second predetermined angle.
  • the mirror may be a total reflectance mirror.
  • the filter and the mirror reflect the incoming optical signal, and the second predetermined angle is from 100° to 160° with respect to the reflected incoming optical signal.
  • the optical subassembly further comprises a fiber adapter or connector configured to receive an optical fiber, and a first fiber stub in the fiber adapter or connector configured to receive or hold the optical fiber or an end thereof.
  • the optical fiber carries both the incoming optical signal and the outgoing optical signal.
  • the fiber adapter may include an angled physical contact (APC) fiber stub configured to receive or hold the optical fiber or an end thereof.
  • the optical subassembly may further comprise (i) an optical isolator between the laser diode and the passive optical signal processing unit, configured to rotate the outgoing optical signal by a predetermined amount in a predetermined direction, (ii) one or more amplifiers (e.g., atransimpedance amplifier and/or a limiting amplifier) configured to amplify the electrical signal from the photodiode, (iii) a first lens between the laser diode and the passive optical signal processing unit configured to focus the outgoing optical signal onto an optical signal transmission medium, (iv) a second lens between the photodetector and the passive optical signal processing unit configured to focus the incoming optical signal onto the photodetector, and/or (v) a second filter between the passive optical signal processing unit and the photodetector configured to filter the incoming optical signal.
  • amplifiers e.g., atransimpedance amplifier and/or a limiting amplifier
  • the first predetermined angle may be from 10° to 30° (e.g., 14° to 25°, or any angle or range of angles therein) with respect to a plane that is orthogonal to the optical axis of the outgoing optical signal
  • the second predetermined angle may be from 10° to 40° (e.g., 23° to 33°, or any angle or range of angles therein) with respect to the optical axis of the outgoing optical signal or the plane that is orthogonal to the optical axis of the outgoing optical signal.
  • Another aspect of the present invention relates to a method of processing optical signals, comprising reflecting one of an incoming optical signal and an outgoing optical signal using a first filter at a first angle adapted to reduce or minimize filter insertion loss relative to the first filter at an angle of 45°, reflecting the one of the incoming optical signal and an outgoing optical signal using a mirror at a second angle, passing the other of the incoming optical signal and the outgoing optical signal through the first filter, converting the incoming optical signal to an incoming electrical signal using a photodetector in an optical path of the incoming optical signal from the first filter or the mirror, and converting an outgoing electrical signal to the outgoing optical signal and emitting the outgoing optical signal toward the first filter or the mirror using a laser diode.
  • the mirror may be a total reflectance mirror.
  • the method of processing optical signals comprises reflecting the incoming optical signal with the first filter, then reflecting the incoming optical signal with the mirror.
  • the second angle may be from 100° to 160° with respect to the reflected incoming optical signal.
  • the method of processing optical signals comprises receiving the incoming optical signal from an optical fiber in a fiber adapter or connector, and transmitting the outgoing optical signal through the optical fiber.
  • the optical fiber or an end thereof may be held or secured with a fiber stub (which may be an APC fiber stub) in the fiber adapter.
  • the fiber adapter may be cylindrical.
  • the method of processing optical signals may further comprise (i) passing the outgoing optical signal through an optical isolator between the laser diode and the passive optical signal processing unit, the optical isolator being configured to rotate the outgoing optical signal by a predetermined amount in a predetermined direction, (ii) focusing the outgoing optical signal onto an optical signal transmission medium using a first lens, (iii) focusing the incoming optical signal onto the photodetector using a second lens, and/or (iv) filtering the incoming optical signal with a second filter between the passive optical signal processing unit and the photodetector.
  • the first angle may be from 10° to 30° (e.g., 14° to 25°, or any angle or range of angles therein) with respect to a plane that is orthogonal to the optical axis of the outgoing optical signal and the second angle may be from 10° to 40° (e.g., 23° to 33°, or any angle or range of angles therein) with respect to the optical axis of the outgoing optical signal or the plane that is orthogonal to the optical axis of the outgoing optical signal.
  • Yet another aspect of the present invention relates to a method of making an optical subassembly, comprising placing a photodetector in a first location in or on an optical housing, placing a laser diode in a second location in or on the optical housing, and forming a passive optical signal processing unit in the optical housing by a process comprising mounting or affixing a first filter on a first surface of the optical housing at a first predetermined angle relative to an optical path of the outgoing optical signal, and mounting or affixing a mirror on a second surface of the optical housing.
  • the photodetector is configured to receive an incoming optical signal
  • the laser diode is configured to emit an outgoing optical signal.
  • the first filter is configured to (i) reflect one of the outgoing optical signal and the incoming optical signal and (ii) allow the other of the outgoing optical signal and the incoming optical signal to pass through, and the first predetermined angle is adapted to reduce or minimize filter insertion loss relative to the first filter at an angle of 45° relative to the outgoing optical signal.
  • the mirror is configured to reflect the one of the outgoing optical signal and the incoming optical signal at a second predetermined angle.
  • the first filter reflects the incoming optical signal
  • the mirror reflects the reflected incoming optical signal.
  • the second predetermined angle may be from 100° to 160° with respect to the incoming optical signal.
  • the method of making an optical subassembly may further comprise connecting, attaching or securing a fiber adapter or connector on or to the optical housing, placing a first fiber stub in the fiber adapter, and placing or securing an optical fiber (or an end thereof) in the first fiber stub.
  • the method may further comprise placing an angled physical contact (APC) fiber stub in the fiber adapter, and placing or securing the optical fiber (or an end thereof) in the APC fiber stub.
  • APC physical contact
  • the method of making an optical subassembly may further comprise (i) mounting or affixing an optical isolator on a third surface of the optical housing between the laser diode and the passive optical signal processing unit configured to rotate the outgoing optical signal by a predetermined amount in a predetermined direction, (ii) mounting or affixing a first lens on the optical housing between the laser diode and the passive optical signal processing unit configured to focus the outgoing optical signal onto an optical signal transmission medium, (iii) mounting or affixing a second lens on the optical housing between the passive optical signal processing unit and the photodetector configured to focus the incoming optical signal onto the photodetector, and/or (iv) mounting or affixing a second filter on a fourth surface of the optical housing between the photodiode and the passive optical signal processing unit, the second filter being configured to filter the incoming optical signal.
  • the first predetermined angle may be from 10° to 30° (e.g., 14° to 25°, or any angle or range of angles therein) with respect to a plane that is orthogonal to the optical axis of the outgoing optical signal
  • the second predetermined angle may be from 10° to 40° (e.g., 23° to 33°, or any angle or range of angles therein) with respect to the optical axis of the outgoing optical signal or the plane that is orthogonal to the optical axis of the outgoing optical signal.
  • the present optical subassembly reduces filter insertion loss in an optical or optoelectronic transceiver relative to the same filter in the same transceiver at an angle of 45° (e.g., as shown in the receiver of FIG. 1) .
  • FIG. 1 is a diagram showing a conventional optical subassembly for an optical receiver.
  • FIG. 2 is a graph depicting insertion loss as a function of wavelength for different filter angles and different light beam characteristics.
  • FIG. 3 shows a first exemplary arrangement of components for an optical subassembly in accordance with one or more embodiments of the present invention.
  • FIG. 4 shows a second exemplary arrangement of components for an optical subassembly in accordance with one or more embodiments of the present invention.
  • FIGS. 5A-B are diagrams showing exemplary optoelectronic transceivers and/or modules in accordance with embodiments of the present invention.
  • FIG. 6 is a diagram showing an exemplary fiber connector in accordance with one or more embodiments of the present invention.
  • the terms “signal” and “optical signal” refer to any known structure, construction, arrangement, technique, method and/or process for physically transferring data or information from one point to another. Also, unless indicated otherwise from the context of its use herein, the terms “fixed, ” “given, ” “certain” and “predetermined” generally refer to a value, quantity, parameter, constraint, condition, state, process, procedure, method, practice, or combination thereof that is, in theory, variable, but is typically set in advance and not varied thereafter when in use.
  • the terms “optical” and “optoelectronic” are generally used interchangeably herein, and use of either of these terms also includes the other, unless the context clearly indicates otherwise, but these terms are generally given their art-recognized meanings herein.
  • the term “transceiver” refers to a device having at least one receiver and at least one transmitter, and use of the term “transceiver” also includes the individual terms “receiver” and/or “transmitter, ” unless the context clearly indicates otherwise.
  • the present invention advantageously reduces filter insertion loss in an optical transceiver or a bidirectional optical assembly (BOSA) . Placing the filter at an angle less than 45° (e.g., 10°-25°) with respect to a plane orthogonal to the outgoing optical signal may decrease filter insertion loss.
  • BOSA bidirectional optical assembly
  • FIG. 2 shows a graph depicting insertion loss as a function of wavelength for different angles of an optical filter and different light beam characteristics.
  • the filter is configured to transmit light having a wavelength of 1610 nm or greater and block light having a wavelength less than or equal to 1550 nm.
  • Line 201 is a spectral curve for light having a halfbeam angle of 8°, with the filter at an angle of incidence of 45°. As is shown by line 201, an appreciable amount of light at or below 1550 nm passes through the filter, and the filter is not completely transparent to light at 1610 nm or higher.
  • Line 202 is a spectral curve for light having a half beam angle of 8°, with the filter at an angle of incidence of 17°.
  • the filter When placed at an angle of 17°, the filter is completely transparent to light at 1610 nm or longer, and substantially completely opaque to light at 1550 nm or shorter. In fact, if a light source providing light at 1610 nm or 1550 nm drifts slightly (e.g., by up to about 10 nm) , the filter at 17° retains its transparency and opaqueness properties with respect to such light.
  • the 17° filter shows better performance and less insertion losses than the 45° filter.
  • Line 203 is a spectral curve for light having a parallel beam with the filter at an angle of incidence of 17°.
  • Line 204 is a spectral curve for light having a parallel beam with the filter at an angle of incidence of 45°.
  • line 204 shows that the filter at an angle of 45° has acceptable performance for a parallel light beam
  • the line 203 shows that the filter at an angle of 17° is transparent over a greater range of wavelengths and opaque over a greater range of wavelengths than the 45° filter.
  • the 17° filter shows better performance and less insertion losses than the filter at 45°.
  • the filter angles represented by lines 202 and 203 have less insertion losses over the wavelength range of 1540–1630 nm than the same filter at an angle of incidence of 45°.
  • the results in FIG. 2 also show that a filter at an angle of incidence in the range of 10°-25° may provide beneficial results, and that filters having other light-filtering (e.g., transparency and opaqueness) properties can benefit from a change in the angle from the conventional 45°.
  • FIG. 3 is a diagram illustrating a first exemplary optical subassembly 300-A (e.g., within an optical transceiver) according to one or more embodiments of the present invention.
  • optical subassembly 300-A comprises an optical transmitter 310, a lens holder 314, a first lens 316, an isolator 320, a first filter 328, a mirror 332, a second filter 336, a second lens 340, and an optical receiver 344.
  • the optical transmitter 310 may comprise a laser or laser diode, such as a heterostructure lasers (e.g., a double heterostructure laser, a separate confinement heterostructure laser, etc.
  • the optical receiver 344 may comprise a photodetector, such as a photodiode (e.g., a PN junction photodiode, a PIN junction photodiode, an avalanche photodiode, etc. ) or other device that converts light into an electric current.
  • the filter 328 and mirror 332 may constitute a passive optical signal processing unit, optionally along with one or more of the filter 336, the isolator 320, the lens 316 and the lens 340.
  • the lens 316 focuses an outgoing optical signal 312 (which may be collimated) from the transmitter 310 onto an optical signal medium transmission 324.
  • the outgoing optical signal 312 is a diffuse beam, and the lens 316 may partially or completely collimate the outgoing optical signal 312.
  • the lens 316 is integral with the lens holder 314.
  • the lens 316 may be a separate unit, held in place by the lens holder 314.
  • the focused outgoing optical signal 318 passes through the isolator 320 to rotate the focused outgoing optical signal 318 by a predetermined amount in a predetermined direction.
  • the isolator 320 may be configured to rotate the focused outgoing optical signal 318 by 45°, in either a clockwise or counterclockwise direction.
  • Isolator 320 may also be positioned at an angle of from 5° to 15° with respect to a plane 350 that is orthogonal to the axis of the focused optical signal 318.
  • the isolated outgoing optical signal 322 then passes through the filter 328 and enters the optical signal transmission medium 324 for transmission to a network.
  • a separate incoming optical signal 326 is received from an optical signal medium transmission 324 (e.g., a fiber optic cable or other optical fiber) .
  • the incoming optical signal 326 has a wavelength or wavelength band that can be received and processed by the receiver 344.
  • the first filter 328 has a surface that reflects the incoming optical signal 326 towards the mirror 332. In the example 300-A shown in FIG. 3, the first filter 328 reflects all or substantially all of the incoming optical signal 326.
  • the first filter 328 is a dichroic mirror or other beam splitter (e.g., along wave pass [LWP] dichroic mirror, short wave pass [SWP] dichroic mirror, etc. ) .
  • the first filter 328 is a wavelength selective filter (e.g., made of or coated with a material that reflects or is transparent to light having a certain wavelength or wavelength band) , a polarization filter (e.g., configured to increase the degree of polarization of the optical signal) , an amplitude modulation mask, a phase modulation mask, a hologram and/or a grating.
  • a wavelength selective filter e.g., made of or coated with a material that reflects or is transparent to light having a certain wavelength or wavelength band
  • a polarization filter e.g., configured to increase the degree of polarization of the optical signal
  • an amplitude modulation mask e.g., a phase modulation mask
  • a hologram e.g., a grating.
  • the first filter 328 is positioned at a first predetermined angle ⁇ with respect to the plane 350 (i.e., that is orthogonal to the axis of the outgoing optical signal 312) .
  • the isolated outgoing optical signal 322 and the incoming optical signal 326 may have an angle of incidence of about 17° on the first filter 328.
  • the first filter 328 is at an angle ⁇ of exactly 17° with respect to the plane 350.
  • the reflected incoming optical signal 330 is further reflected by the mirror 332 toward the receiver 344 or the second filter 336.
  • the mirror 332 is configured to reflect all or substantially all of the reflected incoming optical signal 330.
  • the mirror 332 is positioned at a second predetermined angle ⁇ (e.g., from about 15° to about 60°) with respect to a plane 352 that is parallel with the axis of outgoing optical signal 312.
  • the second angle ⁇ is exactly 28°.
  • the reflected incoming optical signal Prior to impinging on the receiver 344, the reflected incoming optical signal passes through the filter 336 (e.g., a bandpass filter) and the lens 340.
  • the filter 336 is generally configured to narrow or reduce a wavelength band of the reflected incoming optical signal 334 (e.g., allow wavelengths of light within a relatively narrow band to pass through, while blocking other wavelengths of light) .
  • the filter 336 can be placed elsewhere along the optical path of the incoming optical signal (e.g., between the first filter 328 and the mirror 332, between the second lens 340 and the receiver 344, etc. ) .
  • the lens 340 focuses the filtered incoming optical signal 338 onto the receiver 344.
  • the lens 340 as shown is a ball lens, but may also comprise a half-ball lens, a concave lens, a convex lens and/or a combination of concave and convex lenses.
  • the optical receiver 344 can comprise a photodiode (e.g., a PN junction photodiode, a PIN junction photodiode, or an avalanche photodiode, etc. ) or any other device configured to convert an optical signal into an electrical signal.
  • the optical receiver 344 comprises (i) a photodiode configured to receive an optical signal and convert the optical signal into an electrical signal, and (ii) circuitry in electrical communication with the photodiode (e.g., a transimpedence amplifier and/or a limiting amplifier) configured to process (e.g., amplify) the converted electrical signal.
  • the paths of the optical signals from the transmitter 310 and the receiver 344 may be effectively exchanged.
  • the outgoing optical signal 312 may be emitted by transmitter 310 toward the mirror 322, and the incoming optical signal 342 may pass though the filter 328 prior to being focused by the lens 340 and impinging on the receiver 344.
  • the positions of the lens 316 with lens holder 314 and the lens 340 may be effectively exchanged, so that the lens 316 and the lens holder 314 are between the transmitter 310 and the mirror 332, and the lens 340 is between the receiver 344 and the first filter 328.
  • the isolator 320 may be placed between the transmitter 310 and the mirror 332, and the second filter 336 may be placed between the first filter 328 and the receiver 344.
  • the exemplary optical assembly 300-A advantageously reduces or minimizes the filter insertion loss of optical signals (e.g., the reflected incoming optical signal 330 and/or the isolated outgoing optical signal 322) , thereby maximizing the intensity or power of the optical signal.
  • a filter e.g., first filter 328
  • the optical signal can be provided to an optoelectronic receiver and/or transceiver with minimal filter insertion loss, thereby maximizing the power and/or intensity of the optical signal.
  • FIG. 4 illustrates a second exemplary optical subassembly 300-B (e.g., within an optical transceiver) according to one or more embodiments of the present invention.
  • the optical subassembly 300-B contains the same components as the optical subassembly 300-A of FIG. 3, but with different positions and/or angles of the filter 328 and the mirror 332.
  • the filter 328 may be rotated in the opposite direction from that shown in FIG. 3 with respect to the plane 350.
  • the mirror 332 may be placed between the optical path of the incoming optical signal (and/or the isolated outgoing optical signal) 326 and the receiver 344.
  • the angle of the mirror 332 may be 100° to 160° with respect to the reflected incoming optical signal 330.
  • the mirror 332 may be at an angle ⁇ ' with respect to a plane 354 that is parallel with the plane 350.
  • the angle ⁇ ′ is adapted to direct or reflect the reflected incoming optical signal 330 towards the receiver 344 (e.g., through the lens 340) .
  • the exemplary optical assembly 300-B advantageously reduces or minimizes the insertion loss of the filter 328 on the optical signals (e.g., the incoming optical signal 326 and/or the isolated outgoing optical signal 322) , thereby maximizing the intensity or power of the optical signals.
  • the optical signals can be provided (e.g., the incoming optical signal 326 to an optoelectronic receiver and/or the outgoing optical signal 322 to the optical signal transmission medium 324) with minimal filter insertion loss, thereby maximizing the power and/or intensity of the optical signals.
  • a filter e.g., the first filter 328
  • the optical signals can be provided (e.g., the incoming optical signal 326 to an optoelectronic receiver and/or the outgoing optical signal 322 to the optical signal transmission medium 324) with minimal filter insertion loss, thereby maximizing the power and/or intensity of the optical signals.
  • FIG. 5A is a diagram of an optical transceiver 400-A that includes components similar to or the same as those of the optical assembly 300-A in FIG. 3, where the passive optical signal processing unit (e.g., filter 442 and mirror 444) is oriented similarly to the passive optical signal processing unit of optical assembly 300-A of FIG. 3.
  • the passive optical signal processing unit e.g., filter 442 and mirror 444.
  • the optical transceiver 400-A includes a transmitter optical subassembly (TOSA) 410 with a transmitter (e.g., laser diode) 414 and a first lens 416 secured therein, a receiver optical subassembly (ROSA) 420 with a receiver (including a photodetector such as a photodiode) 422 and a second lens 424 secured therein, and a housing 430 including a TOSA sleeve or connector 432, a ROSA sleeve or connector 434, an optical cavity or cavities 436 and a fiber adapter or sleeve 438 including a fiber stub 440 therein.
  • TOSA transmitter optical subassembly
  • ROSA receiver optical subassembly
  • optical cavity or cavities 436 provide surfaces on which components of the passive optical signal processing unit, including a first filter 442, a mirror 444, and a second filter 446, are secured or mounted.
  • Optical transceiver 400-A further comprises a plurality of electrical leads 412a, 412b and 412c to transmitter circuitry within TOSA 410 and one or more sleeves (not shown) to adjust a position of the TOSA 410 or ROSA 420.
  • TOSA 410 may further comprise a window in the wall between the lens 416 and the first filter 442, and an adapter or sleeve (not shown) enabling adjustment of the distance between the transmitter 414 and the lens 416 (e.g., to optimize the focal length of the lens 416) .
  • the optical housing 430 is further configured to house and protect the passive optical signal processing unit.
  • the ROSA 420 is adapted to hold the lens 424 and shield and/or protect the photodetector 422.
  • the ROSA 420 may further include one or more electrical leads 426 to and/or from the circuitry in the ROSA 420.
  • the optical transceiver 400-A may further comprise an optical isolator (not shown) with magnets on opposed sides thereof, between the TOSA 410 and the first filter 442.
  • the fiber adapter or sleeve 438 may include a fiber connector (not shown) configured to secure an optical fiber to the optical transceiver 400-A.
  • the fiber stub 440 holds an end of the optical fiber from the fiber connector in place in the optical cavity 436.
  • the fiber stub 440 comprises an angled physical contact (APC) fiber stub (see, e.g., FIG. 6) .
  • APC physical contact
  • the lens 416 is secured in an opening in the TOSA 410 and focuses light (e.g., an outgoing optical signal) from the transmitter 414.
  • the outgoing optical signal may be focused onto the end of the optical fiber adjusting the distance between the transmitter 414 and the lens 416.
  • the incoming optical signal from the optical fiber may be focused onto the photodetector 422 by adjusting a position of (e.g., sliding) the ROSA 420 in the ROSA sleeve or connector 434.
  • the passive optical signal processing unit (e.g., the filter 442, the mirror 444, and the second filter 446) of the optical transceiver 400-A are mounted onto or affixed to surfaces on or in the optical cavity 436 before the optical fiber (including fiber stub 440) , the TOSA 410 and the ROSA 420 are connected.
  • the first filter 442, the mirror 444 and the second (e.g., bandpass) filter 446 may be mounted or affixed to surfaces of the optical cavity 436 (or on surfaces in separate cavities in the optical housing 430 that opens to a sleeve or connector 432, 434 or 438) by applying a thin adhesive layer to each of the filter 442, mirror 444 and filter 446 (or a peripheral region thereof) and inserting the filter 442, mirror 444 and filter 446 into optical cavity 436 (e.g., through one of the sleeves or connectors 432, 434 or 438) .
  • the optical transceiver 400-A comprises a cavity open to the surface or wall of the housing 430 opposite from the ROSA 420 (e.g., the bottom surface or wall of the housing 430) through which one or more of the passive optical components can be inserted and mounted in the housing 430, and a cap (not shown) configured to seal the cavity in the optical housing 420.
  • FIG. 5B is a diagram of an optical transceiver 400-B that includes the same or similar components as the optical transceiver 400-A in FIG. 5A, but where the passive optical signal processing unit (e.g., filter 442 and mirror 444) is oriented similarly to optical assembly 300-B ofFIG. 4.
  • the optical cavity 436 can have a form or design similar to that in the optical transceiver 400-A in FIG.
  • 5A e.g., separate cavities with an opening to the outside of the optical housing and/or to an adapter or connector for the transmitter, receiver or optical fiber; one central cavity with an opening to the outside of the optical housing or to the optical fiber adapter or connector into which the filter 442, the mirror 444, and second filter 446 are insertedprior to mounting or affixing; etc.
  • FIG. 6 is a diagram showing an exemplary fiber adapter assembly 500.
  • the fiber adapter assembly 500 includes an APC fiber stub 502 in a connector 504, and an optical transmission medium (e.g., an optical fiber) in a fiber adapter 506.
  • the optical transmission medium provides an incoming optical signal 505 to an optical subassembly (not shown) , and receives an outgoing optical signal 501. Since the refractive index of air is different from the refractive index of the optical fiber (e.g., silica glass) , the path of the outgoing optical signal 501 leaving the optical subassembly (which may include air) and entering the optical fiber may be undesirably refracted in the optical fiber.
  • the fiber adapter assembly 500 of FIG. 6 may facilitate straightening the optical path of the outgoing optical signal 501 without adversely affecting the incoming optical signal 505 by orienting the central axis of the APC fiber stub 502 at an angle ⁇ relative to a plane 510 normal to the outgoing optical signal 501.
  • the incoming optical signal 505 is originally aligned with a horizontal optical axis when passing through the fiber in the fiber adapter 506. Without the angled APC fiber stub 502, the outgoing optical signal 501 may be undesirably aligned with the slanted optical axis 508 (e.g., as a result of the outgoing optical signal 501 passing through elements of the optical subassembly) .
  • the surface of APC fiber stub 502 facing the optical subassembly may be at an additional angle ⁇ relative to the plane 510 to advantageously increase the characteristic return loss of any incoming optical signal that reflects back into the optical fiber medium.
  • the APC fiber has an end face without a filter coating, for any incoming optical signal 505, if the angle ⁇ increases, the optical signal return loss will also increase.
  • the plane 512 between the angles ⁇ and ⁇ is normal (i.e., perpendicular) to the axis of the optical transmission medium in the APC fiber stub 502.
  • the outgoing optical signal 501 is aligned with a horizontal optical axis (e.g., the axis of the optical fiber in the fiber adapter 506) when the following equation [1] is satisfied:
  • Embodiments of the present invention advantageously provide an optical subassembly, an optical receiver, transceiver and module including the same, and methods for making and using such an optical subassembly.
  • the present optical subassembly reduces filter insertion losses in the optical signals in an optical or optoelectronic transceiver relative to the prior art.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

L'invention concerne un sous-ensemble optique bidirectionnel, un émetteur-récepteur optique le comprenant, et des procédés de fabrication et d'utilisation de celui-ci. Le sous-ensemble optique comprend une photodiode configurée pour recevoir un signal optique entrant, un émetteur configuré pour émettre un signal optique sortant, et une unité de traitement de signal optique passif comprenant un filtre et un miroir. Le filtre est à un premier angle prédéterminé par rapport à un trajet optique du signal optique sortant et est configuré pour (i) réfléchir l'un du signal optique sortant et du signal optique entrant et (ii) permettre à l'autre signal optique sortant et au signal optique entrant de passer à travers. Le miroir est configuré pour réfléchir le signal optique sortant et le signal optique entrant à un second angle prédéterminé. Le premier angle prédéterminé est conçu pour réduire les pertes d'insertion de filtre.
PCT/CN2017/077427 2017-03-21 2017-03-21 Émetteur-récepteur à perte d'insertion de filtre réduite et procédés de fabrication et d'utilisation de celui-ci WO2018170714A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201780000356.7A CN107223214A (zh) 2017-03-21 2017-03-21 低滤波器插入损耗收发器及其制造和使用方法
PCT/CN2017/077427 WO2018170714A1 (fr) 2017-03-21 2017-03-21 Émetteur-récepteur à perte d'insertion de filtre réduite et procédés de fabrication et d'utilisation de celui-ci

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PCT/CN2017/077427 WO2018170714A1 (fr) 2017-03-21 2017-03-21 Émetteur-récepteur à perte d'insertion de filtre réduite et procédés de fabrication et d'utilisation de celui-ci

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CN109541763B (zh) * 2019-01-23 2020-11-10 江苏奥雷光电有限公司 一种同波长收发光器件

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US20050019037A1 (en) * 2003-07-25 2005-01-27 Luo Xin Simon To can laser package with front monitoring photodetector and turning mirror
JP2005116867A (ja) * 2003-10-09 2005-04-28 Fuji Xerox Co Ltd 光信号伝送装置
CN201449502U (zh) * 2009-07-23 2010-05-05 光库通讯(珠海)有限公司 光学可调谐滤波器
CN102854580A (zh) * 2011-07-28 2013-01-02 索尔思光电（成都）有限公司 适用于降低光信号偏振敏感度的装置及其制造和适用方法
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US20050019037A1 (en) * 2003-07-25 2005-01-27 Luo Xin Simon To can laser package with front monitoring photodetector and turning mirror
JP2005116867A (ja) * 2003-10-09 2005-04-28 Fuji Xerox Co Ltd 光信号伝送装置
CN201449502U (zh) * 2009-07-23 2010-05-05 光库通讯(珠海)有限公司 光学可调谐滤波器
CN102854580A (zh) * 2011-07-28 2013-01-02 索尔思光电（成都）有限公司 适用于降低光信号偏振敏感度的装置及其制造和适用方法
CN105993140A (zh) * 2016-03-23 2016-10-05 索尔思光电（成都）有限公司 包括微机电(mems)反射镜的可调接收器，及其收发器或模块，和其制造和使用方法

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