Laser module, control method of the same, control data of the same, and control data generation method

a semiconductor laser module and control method technology, applied in the direction of electromagnetic transmission, semiconductor lasers, transmission, etc., can solve the problems of inability to achieve the desired optical output intensity, the inability to use beam splitters, and the inability to achieve high-quality optical communication with semiconductor laser modules

Inactive Publication Date: 2011-06-30
SUMITOMO ELECTRIC DEVICE INNOVATIONS
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This solution effectively stabilizes the optical output intensity of semiconductor laser modules, enhancing their performance and reliability in optical communication systems by accurately correcting for temperature-induced distortions in the output optical system.

Problems solved by technology

However, in some cases, the beam splitter may not be used.
The conventional arts, however, have the problem in that the optical output intensity of a desired value is not available. FIG. 3 is a graph showing the afore-mentioned problem.
Under such circumstances, the semiconductor laser module cannot serve as a high-quality one for use in optical communication.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Laser module, control method of the same, control data of the same, and control data generation method
  • Laser module, control method of the same, control data of the same, and control data generation method
  • Laser module, control method of the same, control data of the same, and control data generation method

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0050]A semiconductor module in accordance with a first embodiment of the present invention will be exemplarily described. The semiconductor module in accordance with the first embodiment of the present invention has a wavelength locker that monitors a monitor optical intensity in the rear side (the opposite side of the optical output side) of the semiconductor laser. FIG. 5 is a block diagram of the semiconductor laser in accordance with the first embodiment of the present invention. There are additionally provided a temperature detecting element 22, a first correction table 34, and a transmitting and receiving mechanism between the first correction table 34 and the output controller 20. The temperature detecting element 22 detects the functionality of the output controller 20 and temperature of the output optical system 12. Hereinafter, in the first embodiment, the same components and configurations as those of the conventional art have the same reference numerals. That is to say,...

second embodiment

[0074]A second embodiment of the present invention exemplarily describes an improved one in accordance with the first embodiment of the present invention. In the first embodiment, the optical output intensity has to be corrected due to the change in the temperature, because there exists the problem described below.

[0075]FIG. 9 schematically shows the relationship between the drive current and the wavelength (namely, temperature), obtained in advance before the optical output intensity is corrected by the temperature information (namely, the conventional art). The continuous line indicates the optical output intensity obtained before correction, the long dashed line indicates the drive current before correction, and the short dashed line indicates the desired optical output intensity. Referring now to FIG. 10, when the temperature is changed (as indicated by an arrow in a lateral direction) in order to obtain a desired wavelength, the optical output intensity changes (for example, de...

third embodiment

[0096]A third embodiment of the present invention exemplarily describes a semiconductor laser module having a wavelength locker that monitors the monitor optical intensity on the front side (optical output side) of the semiconductor laser. FIG. 18 is a block diagram of the semiconductor laser module in accordance with a third embodiment of the present invention. The light receiving element 16 receives the light emitted to the front side. Except the light receiving element 16, hereinafter, in the third embodiment, the same components and configurations as those of the first embodiment have the same reference numerals. The beam emitted from the semiconductor laser 10 passes through a beam splitter 14a, and further passes through the output optical system 12, and is externally output as the optical output intensity 50.

[0097]The beam split by the beam splitter 14a passes through another beam splitter 14b and is split into two. One of such split beam reaches the light receiving element 1...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A laser module includes a semiconductor laser, an output optical system provided on an optical output side of the semiconductor laser, a temperature detecting element that detects a temperature of the output optical system; and an output controller that calculates a drive current to set an optical output intensity of the laser module at a desired value on the basis of temperature information obtained by the temperature detecting element, and outputs the drive current to the semiconductor laser.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of U.S. patent application Ser. No. 11 / 392,547, filed Mar. 30, 2006, which claims the benefit of priority from the prior Japanese Patent Application 2005-105488 filed on Mar. 31, 2005, the entire disclosure of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention generally relates to laser modules, control methods of the same, control data, and control data generation methods, and more particularly, to a laser module that keeps an optical output intensity constant, a control method of the same, control data, and a method of generating the control data.[0004]2. Description of the Related Art[0005]In recent years, in the fields of optical communication and home appliances, semiconductor lasers are for use in various products. In particular, with respect to the laser module having a semiconductor laser, there is a need for maintaining a consta...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(United States)
IPC IPC(8): H01S5/0683
CPCH01S5/02216H01S5/02248H01S5/0617H04B10/572H01S5/0683H01S5/0687H01S5/06804H01S5/02325
InventorONO, HARUYOSHIBABA, ISAO
OwnerSUMITOMO ELECTRIC DEVICE INNOVATIONS