Tracking injection seeding power based on back facet monitoring (BFM) of an injection seeded laser
a laser and back facet technology, applied in the direction of laser details, semiconductor lasers, electrical apparatus, etc., can solve the problems of inability to control injection seeded lasers using conventional bfm techniques, changing rapidly, and unknown power level of injection seed light b>24/b>
Inactive Publication Date: 2011-05-19
LG ERICSSON +1
View PDF0 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
"The present invention provides a method for estimating the power of light injected into a transmitter. This is done by measuring the response of the transmitter to the injected light and storing it in a memory. During operation, the temperature of the laser and the current of the injected light are detected, and the stored response data is used to estimate the power of the injected light. This method allows for more accurate control of the injection power, which can improve the performance and reliability of the transmitter."
Problems solved by technology
This raises a difficulty in that the power level of the injection seed light 24 is unknown, and may change rapidly with time.
As a result, conventional BFM techniques cannot be used to control injection seeded lasers.
RSOAs suffer the same limitation, and thus cannot be controlled using conventional BFM techniques.
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0017]The present invention provides techniques for tracking injection seeding power based on Back Facet Monitoring (BFM) of an injection seeded transmitter. A representative embodiment is described below with reference to FIGS. 2-5.
[0018]In very general terms, the injection seed light power by can be tracked (monitored) by first characterising the BFM response of the injection seeded transmitter. This information can be used, during run-time, to determine the respective instantaneous power levels of the injection seed light and the laser output light. This, in turn enables the laser output to be controlled by adjusting the laser bias current. In the following description, two alternative techniques are described. In the first technique described below, the slope of the BFM response is used to estimate the injection seed power level. In the second technique described below, the injection seed power level is estimated from the difference between the BFM response curve for the case of...
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
Login to View More Abstract
A method of estimating an injection power of seed light injected into an injection-seeded transmitter. A back face monitoring (BFM) response of the injection-seeded transmitter is determined, and data representative of the BFM response stored in a memory. During run-time, a controller of the injection-seeded transmitter, detects a temperature of the injection-seeded transmitter and an instantaneous BFM current. BFM response data is obtained from the memory based on the detected temperature, and the seed light injection power estimated based on the obtained data and the detected instantaneous BFM current.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is the first application filed in respect of the present inventionFIELD OF THE INVENTION[0002]The present application relates generally to controlling injection seeded lasers and, more specifically, to tracking injection seeding power based on Back Facet Monitoring (BFM) of an injection seeded transmitter.BACKGROUND OF THE INVENTION[0003]In the field of optical communications, it is well known to use semi-conductor laser diodes to generate a narrowband optical signal onto which data is modulated for transmission through an optical medium such as an optical fibre link. In order to obtain desired characteristics of the optical signal (such as center wavelength, line width, signal reach, for example) the output power of the laser diode must be maintained within narrow tolerances. Because different laser diodes have different output power characteristics in response to a given driving current, it is desirable to monitor the output power ...
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
Login to View More Patent Type & Authority Applications(United States)
IPC IPC(8): H01S3/13H01S3/00
CPCH01S5/0683H01S5/06804
Inventor CAO, BINBECKETT, DOUGLAS JAMESLUK, TOMCHEN, RONG
Owner LG ERICSSON