US2015063820A1PendingUtilityA1

Cross-talk reduction in a bidirectional optoelectronic device

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Assignee: HOYA CORP USAPriority: Apr 28, 2010Filed: Aug 31, 2014Published: Mar 5, 2015
Est. expiryApr 28, 2030(~3.8 yrs left)· nominal 20-yr term from priority
Inventors:Joel S. Paslaski
H04B 10/43H04B 10/40H04B 10/697H04B 10/541G02B 6/4253G02B 6/4246G02B 6/4277G02B 6/4283H04B 10/501
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Claims

Abstract

A bidirectional optoelectronic device comprises a photodetector, a light source, and a drive circuit for the light source. The light source has first and second electrical leads for receiving an input electrical signal, and the drive circuit can be arranged to apply first and second portions of the input electrical signal to the first and second electrical leads, respectively, wherein the second portion of the input electrical signal is a scaled, inverted substantial replica of the first portion of the input electrical signal. A protective encapsulant can be applied that includes hollow dielectric microspheres to reduce electrical cross-talk, and that can further include an optical absorber to reduce optical cross-talk. A waveguide substrate of the device can include light collector(s) or trap(s) for redirecting and attenuating portions of optical signals propagating in waveguide layers on the substrate but not guided by a waveguide.

Claims

exact text as granted — not AI-modified
1 - 169 . (canceled) 
     
     
         170 . A bidirectional optoelectronic device comprising:
 (a) 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 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 drive circuit arranged to apply a first portion of the input electrical signal to the first electrical lead of the light source and to apply a second portion of the input electrical signal to the second lead of the light source, wherein the second portion of the input electrical signal is a scaled, inverted substantial replica of the first portion of the input electrical signal,   wherein:   (d) the photodetector exhibits a cross-talk penalty less than about 3 dB;   (e) the light source and the photodetector are positioned on a common substrate; and   (f) (i) edge dimensions of the substrate are less than about 10 mm or (ii) the light source and the photodetector are positioned within about 2 mm of each other.   
     
     
         171 . The device of  claim 170  wherein the light source and the photodetector are positioned on the substrate within about 2 mm of each other. 
     
     
         172 . The device of  claim 170  wherein edge dimensions of the substrate are less than about 10 mm. 
     
     
         173 . The device of  claim 170  wherein the light source comprises a laser diode, the first electrical lead comprises a cathode of the laser diode, and the second electrical lead comprises an anode of the laser diode. 
     
     
         174 . The device of  claim 170  wherein the input electrical signal comprises one or more amplitude-modulated RF carrier signals or one or more baseband digital amplitude-modulated signals. 
     
     
         175 . The device of  claim 170  wherein the output electrical signal comprises one or more amplitude-modulated RF carrier signals or one or more baseband digital amplitude-modulated signals. 
     
     
         176 . The device of  claim 170  wherein the photodetector is coupled to a transimpedance amplifier. 
     
     
         177 . The device of  claim 170  wherein the photodetector comprises a p-i-n photodiode or an avalanche photodiode. 
     
     
         178 . The device of  claim 170  wherein a selected scale factor of the second portion of the input electrical signal relative to the first portion of the electrical signal results in a minimal cross-talk penalty exhibited by the photodetector. 
     
     
         179 . The device of  claim 170  wherein a scale factor of the second portion of the input electrical signal relative to the first portion of the electrical signal is about unity. 
     
     
         180 . The device of  claim 170  wherein the first and second portions of the input electrical signal differ from one another by an input electrical signal offset. 
     
     
         181 . The device of  claim 170  wherein the input electrical signal is AC-coupled to the light source. 
     
     
         182 . The device of  claim 170  wherein the input electrical signal is DC-coupled to the light source. 
     
     
         183 . A method comprising:
 (a) receiving at a photodetector an input optical signal modulated to encode first transmitted information and generating with the photodetector, in response to the input optical signal, an output electrical signal modulated to encode the first transmitted information;   (b) receiving at a light source an input electrical signal modulated to encode second transmitted information and generating with the light source, 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) applying with a drive circuit a first portion of the input electrical signal to the first electrical lead of the light source and applying with the drive circuit a second portion of the input electrical signal to the second lead of the light source, wherein the second portion of the input electrical signal is a scaled, inverted substantial replica of the first portion of the input electrical signal,   wherein:   (d) the photodetector exhibits a cross-talk penalty less than about 3 dB;   (e) the light source and the photodetector are positioned on a common substrate; and   (f) (i) edge dimensions of the substrate are less than about 10 mm or (ii) the light source and the photodetector are positioned within about 2 mm of each other.   
     
     
         184 . The method of  claim 183  wherein the light source and the photodetector are positioned on the substrate within about 2 mm of each other. 
     
     
         185 . The method of  claim 183  wherein edge dimensions of the substrate are less than about 10 mm. 
     
     
         186 . The method of  claim 183  wherein the light source comprises a laser diode, the first electrical lead comprises a cathode of the laser diode, and the second electrical lead comprises an anode of the laser diode. 
     
     
         187 . The method of  claim 183  wherein the input electrical signal comprises one or more amplitude-modulated RF carrier signals or one or more baseband digital amplitude-modulated signals. 
     
     
         188 . The method of  claim 183  wherein the output electrical signal comprises one or more amplitude-modulated RF carrier signals or one or more baseband digital amplitude-modulated signals. 
     
     
         189 . The method of  claim 183  wherein the photodetector is coupled to a transimpedance amplifier. 
     
     
         190 . The method of  claim 183  wherein the photodetector comprises a p-i-n photodiode or an avalanche photodiode. 
     
     
         191 . The method of  claim 183  wherein a selected scale factor of the second portion of the input electrical signal relative to the first portion of the electrical signal results in a minimal cross-talk penalty exhibited by the photodetector. 
     
     
         192 . The method of  claim 191  further comprising performing an optimization procedure to determine the selected scale factor. 
     
     
         193 . The method of  claim 183  wherein a scale factor of the second portion of the input electrical signal relative to the first portion of the electrical signal is about unity. 
     
     
         194 . The method of  claim 183  wherein the first and second portions of the input electrical signal differ from one another by an input electrical signal offset. 
     
     
         195 . The method of  claim 183  wherein the input electrical signal is AC-coupled to the light source. 
     
     
         196 . The method of  claim 183  wherein the input electrical signal is DC-coupled to the light source.

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