# US 8,571,420 B2 · Apparatus and method for driving wavelength-independent light source

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- Number: US 8,571,420 B2
- Document ID: US8571420B2
- Status: Granted
- Kind: B2
- Application number: 13/334,115
- Filed: 2011-12-22
- Published: 2012-06-28
- Granted: 2013-10-29
- Earliest claimed: 2010-12-23
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Seung-Hyun Cho; Han-Hyub Lee; Jie-Hyun Lee; Jong-Hoon Lee; Eun-Gu Lee; Eui-Suk Jung; Sang-Soo Lee
- Inventors: Seung-Hyun Cho; Han-Hyub Lee; Jie-Hyun Lee; Jong-Hoon Lee; Eun-Gu Lee; Eui-Suk Jung; Sang-Soo Lee
- Web page: https://patentgrep.com/patent/US8571420B2

## CPC

- H04J 14/0279: {WDM point-to-point architectures}
- H04B 10/506: {Multiwavelength transmitters}
- H04J 14/0258: {Wavelength identification or labelling}
- H04J 14/0272: {Transmission of OAMP information}
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04B: TRANSMISSION

## Abstract

An apparatus for driving a wavelength-independent light source is provided. The apparatus includes a seed light signal generation unit configured to generate seed light signals with one or more wavelengths based on a wavelength identification signal, a wavelength light detection unit configured to detect the wavelength identification signal from the seed light signals, an extraction unit configured to extract wavelength information corresponding to the detected wavelength identification signal and extract a driving condition of a wavelength-independent light source corresponding to the extracted wavelength information, and a driving unit configured to drive the wavelength-independent light source according to the extracted driving condition.

## Claims

### Claim 1

An apparatus for driving a wavelength-independent light source, comprising:
a seed light signal generation unit configured to generate seed light signals with one or more wavelengths based on a wavelength identification signal;
a wavelength light detection unit configured to detect the wavelength identification signal from the seed light signals;
an extraction unit configured to extract wavelength information corresponding to the detected wavelength identification signal and extract a driving condition of a wavelength-independent light source corresponding to the extracted wavelength information; and
a driving unit configured to drive the wavelength-independent light source according to the extracted driving condition.

### Claim 2 (depends on 1)

The apparatus of claim 1, further comprising:
a wavelength identification signal generation unit configured to generate the wavelength identification signal.

### Claim 3 (depends on 1)

The apparatus of claim 1, further comprising:
a multiplexing unit configured to generate a multiplexed signal by multiplexing the seed light signals.

### Claim 4 (depends on 3)

The apparatus of claim 3, further comprising:
a demultiplexing unit configured to demultiplex the multiplexed signal.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the wavelength identification signal comprises a low-frequency signal having a pattern that repeats periodically.

### Claim 6 (depends on 1)

The apparatus of claim 1, wherein the extracted driving condition comprises a bias current condition and a modulation condition.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the wavelength-independent light source comprises a reflective semiconductor optical amplifier (RSOA), a reflective electro absorption modulator integrated with SOA (REAM-SOA) or a Fabry-Perot laser diode (FP-LD).

### Claim 8

A method of driving a wavelength-independent light source, comprising:
generating seed light signals with one or more wavelengths based on a wavelength identification signal;
detecting the wavelength identification signal from the seed light signals;
extracting wavelength information corresponding to the detected wavelength identification signal;
extracting a driving condition of a wavelength-independent light source corresponding to the extracted wavelength information; and
driving the wavelength-independent light source according to the extracted driving condition.

### Claim 9 (depends on 8)

The method of claim 8, further comprising:
generating the wavelength identification signal.

### Claim 10 (depends on 8)

The method of claim 8, further comprising:
generating a multiplexed signal by multiplexing the seed light signals.

### Claim 11 (depends on 10)

The method of claim 10, further comprising:
demultiplexing the multiplexed signal.

### Claim 12 (depends on 8)

The method of claim 8, wherein the wavelength identification signal comprises a low-frequency signal having a pattern that repeats periodically.

### Claim 13 (depends on 8)

The method of claim 8, wherein the extracted driving condition comprises a bias current condition and a modulation condition.

### Claim 14 (depends on 8)

The method of claim 8, wherein the wavelength-independent light source comprises an RSOA, a reflective electro absorption modulator integrated with SOA (REAM-SOA) or an FP-LD.