Coaxial transmitter optical subassembly (TOSA) with an optical fiber coupling receptacle

Patent metadata

Field	Value
Publication number	US-9804352-B2
Application number	US-201615073322-A
Country	US
Kind code	B2
Filing date	Mar 17, 2016
Priority date	Mar 17, 2016
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A coaxial transmitter optical subassembly (TOSA) including an optical fiber coupling receptacle coupled to a laser package may be used in an optical transceiver for transmitting an optical signal at a channel wavelength. The optical fiber coupling receptacle may include a housing having a first open end to receive a ferrule-terminated optical fiber. The receptacle may also include a fiber-coupling ferrule holding an optical fiber segment and secured within the housing to optically couple the optical fiber segment to a laser of the TOSA through a second open end of the housing opposite the first open end. The receptacle may further include a sleeve disposed on an interior surface of the housing to provide a cavity to secure the ferrule-terminated optical fiber and align the optical fiber to the optical fiber segment.

First claim

What is claimed is:

1. A coaxial transmitter optical subassembly (TOSA) comprising:
a laser package having an optical coupling end and an electrical connecting end opposite said optical coupling end, said laser package further comprising a laser submount including conductive paths proximate said electrical connecting end for providing electrical connections, and a laser diode mounted on said laser submount and electrically connected to said conductive paths;
an optical fiber coupling receptacle extending from the laser package, the optical fiber coupling receptacle comprising:
a housing having a first open end to receive a fiber-terminating ferrule at one end of an optical fiber;
a fiber-coupling ferrule holding an optical fiber segment, said fiber-coupling ferrule being secured within said housing to optically couple said optical fiber segment to a laser of said TOSA through a second open end of said housing opposite said first open end; and
a sleeve disposed on an interior surface of said housing to provide a sleeve cavity to secure said fiber-terminating ferrule and align said optical fiber to said optical fiber segment; and

a z-ring coupled to said laser package, said z-ring defining a z-ring cavity, said z-ring cavity receiving at least a portion of said housing.

2. The coaxial TOSA of claim 1 , wherein said housing and said sleeve are configured to provide concentric alignment of said optical fiber and said optical fiber segment to within a tolerance of 0.5 microns or less.

3. The coaxial TOSA of claim 1 , wherein said second open end provides an aperture through which light from said laser diode is focused at a focal point coincident with said optical fiber segment.

4. The coaxial TOSA of claim 1 , wherein an inner diameter of said sleeve is selected to match an outer diameter of said fiber-terminating ferrule, such that said fiber-terminating ferrule may be inserted and secured in said sleeve cavity.

5. The coaxial TOSA of claim 1 , wherein said sleeve is a split sleeve comprising a slot along the longitudinal axis of said sleeve configured to allow flexibility during insertion of said fiber-terminating ferrule in said sleeve cavity.

6. The coaxial TOSA of claim 1 , wherein an end of said optical fiber opposite said ferrule-terminated end is bonded to an arrayed waveguide grating multiplexer.

7. The coaxial TOSA of claim 3 , wherein said laser package further comprises optics mounted proximate to said optical coupling end, said optics including a lens to focus said light from said laser diode to said focal point.

8. The coaxial TOSA of claim 7 , wherein said optics further include an optical isolator.

9. The coaxial TOSA of claim 1 , wherein the laser package is a cuboid type TO laser package having a plurality of substantially flat outer surfaces.

10. An optical transceiver module comprising:
a transceiver housing;
a plurality of coaxial transmitter optical subassemblies (TOSAs) located in said transceiver housing for transmitting optical signals at different channel wavelengths, each of said plurality of coaxial TOSAs comprising:
a laser package having an optical coupling end and an electrical connecting end opposite said optical coupling end, said laser package further comprising a laser submount including conductive paths proximate said electrical connecting end for providing electrical connections, and a laser diode mounted on said laser submount and electrically connected to said conductive paths; and
an optical fiber coupling receptacle extending from the laser package, the optical fiber coupling receptacle comprising:
a housing having a first open end to receive a fiber-terminating ferrule at one end of an optical fiber;
a fiber-coupling ferrule holding an optical fiber segment, said fiber-coupling ferrule being secured within said housing to optically couple said optical fiber segment to a laser of said TOSA through a second open end of said housing opposite said first open end; and
a sleeve disposed on an interior surface of said housing to provide a sleeve cavity for securing said fiber-terminating ferrule and align said optical fiber to said optical fiber segment; and

a z-ring coupled to said laser package, said z-ring defining a z-ring cavity, said z-ring cavity receiving at least a portion of said housing; and

a multi-channel receiver optical subassembly (ROSA) located in said transceiver housing for receiving optical signals at different channel wavelengths.

11. The optical transceiver of claim 10 , wherein said housing and said sleeve are configured to provide concentric alignment of said optical fiber and said optical fiber segment to within a tolerance of 0.5 microns or less.

12. The optical transceiver of claim 10 , wherein said second open end provides an aperture through which light from said laser diode is focused at a focal point coincident with said optical fiber segment.

13. The optical transceiver of claim 10 , wherein an inner diameter of said sleeve is selected to match an outer diameter of said fiber-terminating ferrule, such that said fiber-terminating ferrule may be inserted and secured in said sleeve cavity.

14. The optical transceiver of claim 10 , wherein said sleeve is a split sleeve comprising a slot along the longitudinal axis of said sleeve configured to allow flexibility during insertion of said fiber-terminating ferrule in said sleeve cavity.

15. The optical transceiver of claim 10 , wherein an end of said optical fiber opposite said ferrule-terminated end is bonded to an arrayed waveguide grating multiplexer.

16. The optical transceiver of claim 12 , wherein said laser package further comprises optics mounted proximate to said optical coupling end, said optics including a lens to focus said light from said laser diode to said focal point.

17. The optical transceiver of claim 10 further comprising a transmit connecting circuit electrically connected to said coaxial TOSAs and a receive connecting circuit electrically connected to said ROSA.

18. The optical transceiver of claim 10 further comprising a mux-fiber assembly including an optical multiplexer coupled to a plurality of ferrule-terminated optical fibers, each of said ferrule-terminated optical fibers including a fiber-terminating ferrule at one end for insertion into a respective one of the optical fiber receptacles, and wherein the multiplexer is configured to multiplex said transmitted optical signals into a transmitted multiplexed optical signal.

19. The optical transceiver of claim 18 further comprising an optical demultiplexer coupled to said ROSA for demultiplexing a received multiplexed optical signal into said received optical signals.

20. The optical transceiver of claim 10 wherein said plurality of coaxial TOSAs comprises four coaxial TOSAs configured to transmit at four different channel wavelengths at transmission rates of at least about 10 Gbps per channel and transmission distances of 2 km to at least about 10 km.

Assignees

• Applied Optoelectronics Inc

Inventors

• Yeh Che-Shou
• Luo Jianhong
• Su Li-Chieh
• Sun Weihao
• Liu Hua

Classifications

• G02B6/4204

  the coupling comprising intermediate optical elements, e.g. lenses, holograms (encapsulated active devices H01S5/02208) · CPC title

• G02B6/3877

  Split sleeves · CPC title

• G02B6/4246

  Bidirectionally operating package structures · CPC title

• G02B6/421

  the intermediate optical component consisting of a short length of fibre, e.g. fibre stub · CPC title

• G02B6/4208

  using non-reciprocal elements or birefringent plates, i.e. quasi-isolators (optical isolators per se G02F1/093, G02F1/0955) · CPC title