OPTICAL TRANSMISSION DEVICE

• US 20110058819A1
• Filed: 09/03/2010
• Published: 03/10/2011
• Est. Priority Date: 03/05/2008
• Status: Abandoned Application

• Current Assignee: Fujikura Limited
• Original Assignee: Fujikura Limited
• Inventors: KANNO, Yoshiaki, KIMURA, Naoki, FUKUDA, Takeshi, OTAKE, Mamoru, AZEGAMI, Koji, SHIMIZU, Hiroki
• Application Number:
  US12/875,696
• Publication Number:
  US 20110058819A1
• Time in Patent Office: Days
• US Class Current: 398/135
• CPC Class Codes: H04B 10/50 Transmitters
• CPC Class Codes: H04B 10/66 Non-coherent receivers, e.g. using direct detection

Abstract

Provided is an optical transmission device which includes: an optical transmission unit including a light-emitting element; an optical reception unit including a static current source generating bias current for driving the light-emitting element; a light-transmitting medium optically connecting the light-emitting element and a light-receiving element to each other; and an electricity-transmitting medium transmitting the bias current from the static current source to the light-emitting element.

Claims

1. An optical transmission device comprising:

an optical transmission unit including a light-emitting element;

an optical reception unit including a static current source generating bias current for driving the light-emitting element;

a light-transmitting medium optically connecting the light-emitting element and a light-receiving element to each other; and

an electricity-transmitting medium transmitting the bias current from the static current source to the light-emitting element.

7. The optical transmission device according to claim 1, wherein the optical transmission unit further includes an impedance-matching element.

8. The optical transmission device according to claim 1, wherein the optical reception unit further includes an impedance-matching element.

9. The optical transmission device according to claim 1, wherein the optical transmission unit further includes a low-pass filter disposed between the electricity-transmitting medium and the light-emitting element.

10. The optical transmission device according to claim 1, wherein the optical transmission unit receives a differential input signal as an input signal from an outside.

11. The optical transmission device according to claim 1, wherein the optical transmission unit further includes a protection circuit disposed between the electricity-transmitting medium and the light-emitting element.

12. The optical transmission device according to claim 1, wherein one of a photoelectric composite cable in which the light-transmitting medium and the electricity-transmitting medium are combined in a body, a photoelectric composite wiring board in which a light waveguide and the electricity-transmitting medium are disposed on a substrate, and a light waveguide coated with metal is disposed as the light-transmitting medium and the electricity-transmitting medium.

13. The optical transmission device according to claim 1, wherein the optical transmission unit and the optical reception unit are each air-tightly sealed by a conductive package, and

wherein the electricity-transmitting medium is electrically connected between the package air-tightly sealing the optical transmission unit and the package air-tightly sealing the optical reception unit.

14. The optical transmission device according to claim 1, wherein the electricity-transmitting medium transmits current wirelessly.

2. An optical transmission device comprising:

an optical transmission unit including a light-emitting element;

an optical reception unit including a light-receiving element and a current source generating bias current for adjusting an optical power of the light-emitting element based on an electrical signal into which light received by the light-receiving element is converted;

a light-transmitting medium optically connecting the light-emitting element and the light-receiving element to each other; and

an electricity-transmitting medium transmitting the bias current from the current source to the light-emitting element.

3. The optical transmission device according to claim 2, wherein the optical reception unit further includes an error detector measuring an intensity of the light received by the light-receiving element and controlling a magnitude of the bias current generated by the current source based on a measured value.

4. The optical transmission device according to claim 3, wherein the optical reception unit further includes a low-pass filter disposed between the error detector and the current source.

5. The optical transmission device according to claim 3, wherein the optical reception unit further includes a trans-impedance amplifier and a low-pass filter, and

wherein the light-receiving element, the trans-impedance amplifier, the low-pass filter, and the error detector are disposed in this order.

6. The optical transmission device according to claim 2, wherein the optical reception unit further includes an average calculator calculating an average value of the intensity of the light received by the light-receiving element.

15. The optical transmission device according to claim 2, wherein the optical transmission unit further includes an impedance-matching element.

16. The optical transmission device according to claim 2, wherein the optical reception unit further includes an impedance-matching element.

17. The optical transmission device according to claim 2, wherein the optical transmission unit further includes a low-pass filter disposed between the electricity-transmitting medium and the light-emitting element.

18. The optical transmission device according to claim 2, wherein the optical transmission unit receives a differential input signal as an input signal from an outside.

19. The optical transmission device according to claim 2, wherein the optical transmission unit further includes a protection circuit disposed between the electricity-transmitting medium and the light-emitting element.

20. The optical transmission device according to claim 2, wherein one of a photoelectric composite cable in which the light-transmitting medium and the electricity-transmitting medium are combined in a body, a photoelectric composite wiring board in which a light waveguide and the electricity-transmitting medium are disposed on a substrate, and a light waveguide coated with metal is disposed as the light-transmitting medium and the electricity-transmitting medium.

21. The optical transmission device according to claim 2, wherein the optical transmission unit and the optical reception unit are each air-tightly sealed by a conductive package, and

wherein the electricity-transmitting medium is electrically connected between the package air-tightly sealing the optical transmission unit and the package air-tightly sealing the optical reception unit.

22. The optical transmission device according to claim 2, wherein the electricity-transmitting medium transmits current wirelessly.