Optical generation of tunable and narrow linewidth radio frequency signal based on mutual locking between integrated semiconductor lasers

Ning Zhang; Xinlun Cai; and Siyuan Yu

doi:10.1364/PRJ.2.000B11

Photonics Research, Volume. 2, Issue 4, B11(2014)

Optical generation of tunable and narrow linewidth radio frequency signal based on mutual locking between integrated semiconductor lasers

Ning Zhang^1,2, Xinlun Cai², and and Siyuan Yu^1,2、*

Author Affiliations

¹Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1UB, UK

²State Key Laboratory of Optoelectronic Materials and Technology, School of Physical Science and Engineering Technologies, Sun Yat-sen University, Guangzhou 510 275, China

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Figures & Tables(9)

Fig. 1. Schematic diagram of RF signal generation circuit based on mutual locking among two DFB lasers and one SRL.

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Fig. 2. Spectra of (a) dual DFB injection-locked SRL modes in the CCW and CW directions, and (b) generated RF signal by beating the two lasing modes in the CCW direction. Pdfb1,2=0.23 dBm, Psrl−fr=−20.3 dBm, and Δω=0.

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Fig. 3. FN curves of DFB lasers, SRL, and the generated RF signals.

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Fig. 4. Linewidth of the generated RF signal as a function of tuning frequency.

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Fig. 5. Influence of backscattering coefficient and feedback phase change on the linewidth of the generated RF signal. (a) General evolution, with linewidth expressed in log, (b) results of two special k values. Pdfb1,2=0.23 dBm, Psrl=−20.3 dBm, and Δω=0.

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Fig. 6. Linewidth of the generated RF signal (in log) as a function of (a) power ratio (Pdfb/Psrl), where Pdfb=Pdfb1=Pdfb2 and Δω=0, and (b) power ratio (Pdfb2/Pdfb1), where Pdfb1=0.23 dBm and Δω=0.

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Fig. 7. Linewidth of the generated RF signal (in log) as a function of the injection frequency detuning of the two DFB lasers.

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Table 1. Values of the DFB Parameters Used for Numerical Simulation

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Table 1. Values of the DFB Parameters Used for Numerical Simulation

Parameter	Description	Value	Unit
$V$	Volume of the active region	150	${μm}^{- 3}$
$L_{dfb}$	Length of DFB laser	300	μm
$n_{dfb}$	Refractive index of the active region	3.525	—
$α_{dfb}$	Linewidth enhancement factor	5	—
$G_{t h 0}$	Threshold gain level	$2.44 \times 10^{11}$	$s^{- 1}$
$N_{g}$	Electron number at transparency	$1.328 \times 10^{8}$	—
$R_{f}$	Power reflectivity of the front facet	0.2	—
$R_{b}$	Power reflectivity of the back facet	0.9	—
$k_{dfb}$	Coupling ratio into DFB laser cavity	0.3	—

Table 2. Values of the SRL Parameters Used for Numerical Simulation

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Table 2. Values of the SRL Parameters Used for Numerical Simulation

Parameter	Description	Value	Unit
$L_{srl}$	SRL cavity length	4106	${μm}^{- 3}$
$N_{0}$	Transparency carrier density	$2.2 \times 10^{24}$	$m^{- 3}$
$α_{srl}$	Linewidth enhancement factor	1. 57	—
$a$	Gain-slope coefficient	$6.35 \times 10^{- 20}$	$m^{- 2}$
$n_{srl}$	Group index	3.7	—
$k_{c}$	Conservative coupling	0.0044	$s^{- 1}$
$k_{d}$	Dissipative coupling	0.000327	$s^{- 1}$
$k_{cp}$	Coupling ratio into SRL cavity	0.3	—
$τ_{p}$	Photon lifetime in SRL	10	ps
$λ_{0}$	Central lasing wavelength	$1550$	nm

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Ning Zhang, Xinlun Cai, and Siyuan Yu, "Optical generation of tunable and narrow linewidth radio frequency signal based on mutual locking between integrated semiconductor lasers," Photonics Res. 2, B11 (2014)

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Paper Information

Special Issue: MICROWAVE PHOTONICS

Received: Mar. 28, 2014

Accepted: May. 4, 2014

Published Online: Sep. 15, 2014

The Author Email: and Siyuan Yu (S.Yu@bristol.ac.uk)

DOI:10.1364/PRJ.2.000B11

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology