Burst optical signal transmission device and burst optical signal transmission method

Patent metadata

Field	Value
Publication number	US-2017237232-A1
Application number	US-201515519170-A
Country	US
Kind code	A1
Filing date	Oct 26, 2015
Priority date	Oct 29, 2014
Publication date	Aug 17, 2017
Grant date	—

Abstract

A burst optical signal transmission device which includes a light source for generating and outputting burst signal light, a light source driving circuit for outputting, to the light source, a driving signal for switching between an output time and a stop time of the burst signal light, based on a burst control signal, and a pre-emphasis circuit for outputting a pre-emphasis control signal for superimposing an additional signal for charging a capacitor included in the light source, onto the driving signal, at a timing in the vicinity of the beginning of the burst control signal.

First claim

What is claimed is:

1 . A burst optical signal transmission device comprising:
a light source for generating and outputting burst signal light; a light source driving circuit for outputting, to the light source, a driving signal for switching between an output time and a stop time of the burst signal light, based on a burst control signal; and a pre-emphasis circuit for outputting a pre-emphasis control signal for superimposing an additional signal for charging a capacitor included in the light source, onto a vicinity of a beginning of the driving signal.

2 . The burst optical signal transmission device according to claim 1 , wherein the vicinity of the beginning of the driving signal is a predetermined timing earlier than the beginning of the driving signal.

3 . The burst optical signal transmission device according to claim 2 , wherein the predetermined timing is a timing going back from the beginning of the driving signal, by a time required for charging the capacitor to a first predetermined rate.

4 . The burst optical signal transmission device according to claim 3 , wherein the predetermined timing is defined based on capacity of the capacitor, current to be flown into the capacitor, and voltage to be applied to the light source.

5 . The burst optical signal transmission device according to claim 4 , further comprising a current supplying unit for supplying, to the light source, such current as to cause charging of the capacitor to fall within a range being smaller than a second predetermined rate being lower than the first predetermined rate.

6 . The burst optical signal transmission device according to claim 4 , wherein the capacitor includes a bypass capacitor arranged in parallel with the light source or a parasitic capacitor underlying in the light source, or the bypass capacitor and the parasitic capacitor.

7 . A burst optical signal transmission method executed by a burst optical signal transmission device for generating and outputting burst signal light using a light source, the method comprising:
a pre-emphasis circuit outputting, when a light source driving circuit outputs, to the light source, a driving signal for switching between an output time and a stop time of the burst signal light, based on a burst control signal, a pre-emphasis control signal for superimposing an additional signal for charging a capacitor included in the light source, onto a vicinity of a beginning of the driving signal.

8 . The burst optical signal transmission device according to claim 1 , further comprising a current supplying unit for supplying, to the light source, such current as to cause charging of the capacitor to fall within a range being smaller than a second predetermined rate being lower than the first predetermined rate.

9 . The burst optical signal transmission device according to claim 1 , wherein the capacitor includes a bypass capacitor arranged in parallel with the light source or a parasitic capacitor underlying in the light source, or the bypass capacitor and the parasitic capacitor.

10 . The burst optical signal transmission device according to claim 2 , further comprising a current supplying unit for supplying, to the light source, such current as to cause charging of the capacitor to fall within a range being smaller than a second predetermined rate being lower than the first predetermined rate.

11 . The burst optical signal transmission device according to claim 2 , wherein the capacitor includes a bypass capacitor arranged in parallel with the light source or a parasitic capacitor underlying in the light source, or the bypass capacitor and the parasitic capacitor.

12 . The burst optical signal transmission device according to claim 3 , further comprising a current supplying unit for supplying, to the light source, such current as to cause charging of the capacitor to fall within a range being smaller than a second predetermined rate being lower than the first predetermined rate.

13 . The burst optical signal transmission device according to claim 3 , wherein the capacitor includes a bypass capacitor arranged in parallel with the light source or a parasitic capacitor underlying in the light source, or the bypass capacitor and the parasitic capacitor.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Asaka Kota
• Taguchi Katsuhisa

Classifications

• H01S5/042 Primary

  Electrical excitation {; Circuits therefor (monolithically integrated laser drive components H01S5/0261)} · CPC title

• H04B10/503

  Laser transmitters · CPC title

• H01S5/06213 Primary

  Amplitude modulation · CPC title

• H04B10/541

  Digital intensity or amplitude modulation · CPC title

• H01S5/06216

  Pulse modulation or generation · CPC title