Applied Optoelectronics, Inc.

Jianhong Luo

Che-Shou Yeh

I-Lung Ho

Chong Wang

Peng Nie

Hua Liu

Li-Chieh Su

Weihao Sun

Haohui Mao

A coaxial transmitter optical subassembly (TOSA) including a ball lens may be used in an optical transceiver for transmitting an optical signal at a channel wavelength. The coaxial TOSA includes a laser package with a ball lens holder section defining a lens holder cavity that receives the ball lens. The lens holder cavity is dimensioned such that the ball lens is positioned in substantial alignment with the laser diode for optically coupling a laser output from the laser diode into an optical waveguide at an optical coupling end of the TOSA. The coaxial TOSA is thus configured to allow the less expensive ball lens to be used in a relatively small package when a lower coupling efficiency and power is desired and without substantial redesign of the TOSA.

Coaxial transmitter optical subassembly (TOSA) including ball lens

A coaxial transmitter optical subassembly (TOSA) with optical isolator alignment correction may be used in an optical transceiver for transmitting an optical signal at a channel wavelength. The coaxial TOSA includes an optical fiber coupling receptacle extending from a laser package. The laser package may include a laser diode and a lens to focus laser light emitted from the laser diode onto an optical fiber. The laser diode and lens are aligned along a first longitudinal axis of the laser package parallel to a transmission path of the laser light. An optical isolator located in the transmission path is aligned along a second longitudinal axis of the laser package. The second longitudinal axis is coincident with a centerline of the laser package, and the first longitudinal axis is offset from the second longitudinal axis by a predetermined offset distance to compensate for light shifting characteristics of the isolator.

Alignment correction for optical isolator in a coaxial transmitter optical subassembly (TOSA)

Layered coaxial transmitter optical subassemblies (TOSAs) with a support bridge therebetween may be used in an optical transmitter or transceiver for transmitting optical signals at multiple channel wavelengths. The coaxial TOSAs may include cuboid type TO laser packages having substantially flat outer surfaces that may be mounted on substantially flat outer surfaces on a transmitter or transceiver housing or on the support bridge. The support bridge supports and isolates one layer of the TOSAs mounted over another layer of the TOSAs such that the TOSAs may be stacked to fit within a small space without sacrificing optical coupling efficiency.

Layered coaxial transmitter optical subassemblies with support bridge therebetween

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.

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Ningbo, China

Jianhong Luo