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

Journals >Photonics Research >Volume 2 >Issue 4 >Page B11 > Article

Photonics Research
Vol. 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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DOI: 10.1364/PRJ.2.000B11 Cite this Article Set citation alerts

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[J]. Photonics Research, 2014, 2(4): B11 Copy Citation Text

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

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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.

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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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 1. Values of the DFB Parameters Used for Numerical Simulation

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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