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US 2012/0057880 A1Published application
Cross-talk reduction in a bidirectional optoelectronic device
AssigneeHOYA Corporation USA
InventorsAraceli Ruiz, Peter C. Sercel, Joel S. Paslaski, Rolf A. Wyss
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Abstract
A multi-channel or bidirectional optoelectronic device comprises a two or more optoelectronic components, e.g., a photodetector and a light source. A protective encapsulant can be applied to the optoelectronic device that includes hollow dielectric microspheres to reduce electrical cross-talk, and that can further include an optical absorber to reduce optical cross-talk.
Claims24
A multi-channel optoelectronic device comprising:
- two or more optoelectronic components;
- and
- a protective encapsulant arranged to encapsulate the optoelectronic components, wherein:
- each optoelectronic component comprises:
- (a) a photodetector arranged (i) to receive a corresponding input optical signal modulated to encode corresponding transmitted information and (ii) to generate in response to the corresponding input optical signal a corresponding output electrical signal modulated to encode the corresponding transmitted information;
- or (b) a light source arranged (i) to receive a corresponding input electrical signal modulated to encode corresponding transmitted information and (ii) to generate in response to the corresponding input electrical signal a corresponding output optical signal modulated to encode the corresponding transmitted information;
- and
- the encapsulant includes hollow dielectric microspheres dispersed within its volume so as to reduce a cross-talk penalty arising from unwanted electrical signals present in the encapsulant to a level below that exhibited by the multi-channel device without the microspheres in the encapsulant.
5 more elements
A bidirectional optoelectronic device comprising:
- (a) a first optoelectronic component comprising a photodetector arranged (i) to receive an input optical signal modulated to encode first transmitted information and (ii) to generate in response to the input optical signal an output electrical signal modulated to encode the first transmitted information;
- (b) a second optoelectronic component comprising a light source arranged (i) to receive an input electrical signal modulated to encode second transmitted information and (ii) to generate in response to the input electrical signal an output optical signal modulated to encode the second transmitted information, which light source has first and second electrical leads for receiving the input electrical signal;
- and
- (c) a protective encapsulant arranged to encapsulate the photodetector and the light source, which encapsulant includes hollow dielectric microspheres dispersed within its volume so as to reduce a cross-talk penalty arising from unwanted electrical signals present in the encapsulant to a level below that exhibited by the bidirectional device without the microspheres in the encapsulant.
1 more element
A bidirectional optoelectronic device comprising:
- (a) a first optoelectronic component comprising a photodetector arranged (i) to receive an input optical signal modulated to encode first transmitted information and (ii) to generate in response to the input optical signal an output electrical signal modulated to encode the first transmitted information;
- (b) a second optoelectronic component comprising a light source arranged (i) to receive an input electrical signal modulated to encode second transmitted information and (ii) to generate in response to the input electrical signal an output optical signal modulated to encode the second transmitted information, which light source has first and second electrical leads for receiving the input electrical signal;
- and
- (c) a protective encapsulant arranged to encapsulate the photodetector and the light source,
- wherein:
- the encapsulant comprises a silicone, epoxy, or polyurethane polymer and includes hollow silica microspheres and carbon particles dispersed within its volume;
- the encapsulant comprises between about 25% and about 50% by volume of the silica microspheres and between about 0.1% and about 2% by weight of the carbon particles;
- the dielectric microspheres have a median diameter between about 40 μm and about 70 μm;
- the optoelectronic components are positioned on a common substrate with edge dimensions less than about 10 mm;
- and
- the photodetector exhibits a cross-talk penalty less than about 3 dB.
8 more elements
Dependencies are inferred from the claim text.