Journal of Optical Communications and Networking
Vol. 11,
Issue 11,
pp. 559-567
(2019)
•https://doi.org/10.1364/JOCN.11.000559

DRoF-based optical video re-transmission of commercial RF broadcast signals

Ryota Shiina, Toshihito Fujiwara, Tomohiro Taniguchi, and Satoshi Ikeda

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Ryota Shiina, Toshihito Fujiwara, Tomohiro Taniguchi, and Satoshi Ikeda, "DRoF-based optical video re-transmission of commercial RF broadcast signals," J. Opt. Commun. Netw. 11, 559-567 (2019)

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Abstract

We propose a novel digitized radio-over-fiber (DRoF)-based optical video re-transmission system. This system digitally transmits radio frequency (RF) broadcast signals via the communication network (NW) while maintaining the existing RF interface at both ends of the NW by using DRoF technology. Directly digitizing the RF signal makes the required transmission rate of the optical NW impractically large. In order to resolve this issue, we also propose an improved nonlinear quantization (INL) method that combines amplitude clipping and nonlinear quantization. This paper experimentally evaluates the feasibility of optical re-transmission by using a commercial 9-channel multiplexed digital terrestrial television broadcasting signal. The results of the experiment and our theoretical analysis show that it is necessary to re-transmit with 7-bit quantization at the transmitter in order to achieve the required signal quality. However, we show that re-transmission can be realized while satisfying the required quality with just 5 bits by using our proposed INL method. The resulting 2-bit reduction afforded by the INL proposal reduces the transmission rate by 28.6%.

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System Component	SNR	SNR Equation		Abbreviation
Amplifier	${S N R}_{A m p_T x}$ [10]	(1) ${S N R}_{A m p_T x} [d B] = S_{P o w e r_T x} - N F_{T x} - 10 \log_{10} (k_{B} B T)$	$S_{P o w e r_T x}$ :	Input signal power to Tx amp [dBm]
			$S_{P o w e r_R x}$ :	Input signal power to Rx amp [dBm]
			$N F_{T x}$ :	Noise figure of Tx amp [dB]
			$N F_{R x}$ :	Noise figure of Rx amp [dB]
	${S N R}_{A m p_R x}$ [10]	(2) ${S N R}_{A m p_R x} [d B] = S_{P o w e r_R x} - N F_{R x} - 10 \log_{10} (k_{B} B T)$	$k_{B}$ :	Boltzmann constant [ ${J K}^{- 1}$ ]
			$T$ :	Temperature [K]
			$B$ :	Total bandwidth [Hz]
Downconverter	${S N R}_{D C}$ [11]	(3) ${S N R}_{D C} [d B] = - 20 \log_{10} (2 π σ_{D C} f_{L O})$	$σ_{D C_L O}$ :	Jitter of DC LO [s]
			$σ_{U C_L O}$ :	Jitter of UC LO [s]
Upconverter	${S N R}_{U C}$ [11]	(4) ${S N R}_{U C} [d B] = - 20 \log_{10} (2 π σ_{U C} f_{L O})$	$f_{L O}$ :	Frequency of LO [Hz]
Quantization	${S N R}_{Q u a n t i z a t i o n}$ [12,13]	(5) ${S N R}_{Q u a n t i z a t i o n} [d B] = 6.02 n + 10 \log_{10} 3 - P A R$	$n$ :	Quantization bit
			PAR:	Peak-to-average power ratio [dB]
ADC	${S N R}_{A D C_J i t t e r}$ [14]	(6) ${S N R}_{A D C_j i t t e r} [d B] = - 20 \log_{10} (2 π σ_{A D C} f_{c})$	$σ_{A D C}$ :	Jitter of ADC [s]
			$σ_{D A C}$ :	Jitter of ADC [s]
DAC	${S N R}_{D A C_J i t t e r}$ [14]	(7) ${S N R}_{D A C_j i t t e r} [d B] = - 20 \log_{10} (2 π σ_{D A C} f_{c})$	$f_{c}$ :	Carrier frequency [Hz]
Optical link	${S N R}_{O p t i c a l_L i n k}$ [15]	(8) $S i g n a l P o w e r = \frac{V_{m a x}^{2} [{(2^{n})}^{2} - 1]}{3 \cdot {(2^{n})}^{2}}$	$P_{O p t i c a l_L i n k}$ :	BER of optical link
		(9) ${N o i s e P o w e r}_{O p t i c a l_L i n k} = \frac{4 \cdot V_{m a x}^{2} [{(2^{n})}^{2} - 1]}{3 \cdot {(2^{n})}^{2}} P_{O p t i c a l_L i n k}$	$V_{m a x}$ :	Maximum voltage of the sampled signal [V]
		(10) ${S N R}_{O p t i c a l_L i n k} = {\frac{S i g n a l P o w e r}{N o i s e P o w e r}}_{O p t i c a l_L i n k}$

Symbol	Quantity	Value
$S_{P o w e r_T x}$ [dBm]	Input signal power to Tx amp	−18.9
$S_{P o w e r_R x}$ [dBm]	Input signal power to Rx amp	−17.3
$N F_{T x}$ [dB]	Noise figure of Tx amp	6
$N F_{R x}$ [dB]	Noise figure of Rx amp	6
$k_{B}$ [ ${J K}^{- 1}$ ]	Boltzmann constant	$1.38 \times 10^{- 23}$
$T$ [K]	Temperature	300
$B$ [MHz]	Total bandwidth	54
$σ_{D C_L O}$ [ps]	Jitter of DC LO	0.2
$σ_{U C_L O}$ [ps]	Jitter of UC LO	0.2
$f_{L O}$ [MHz]	Frequency of LO	500
$f_{c}$ [MHz]	Carrier frequency	125
$n$	Quantization bit	3–18
PAR [dB]	Peak-to-average power ratio	14.33
$σ_{A D C}$ [ps]	Jitter of ADC	0.2
$σ_{D A C}$ [ps]	Jitter of DAC	0.2
$P_{O p t i c a l_L i n k}$	BER of optical link	$1.0 \times 10^{- 10}$

System Component	SNR	SNR Equation		Abbreviation
Amplifier	${S N R}_{A m p_T x}$ [10]	(1) ${S N R}_{A m p_T x} [d B] = S_{P o w e r_T x} - N F_{T x} - 10 \log_{10} (k_{B} B T)$	$S_{P o w e r_T x}$ :	Input signal power to Tx amp [dBm]
			$S_{P o w e r_R x}$ :	Input signal power to Rx amp [dBm]
			$N F_{T x}$ :	Noise figure of Tx amp [dB]
			$N F_{R x}$ :	Noise figure of Rx amp [dB]
	${S N R}_{A m p_R x}$ [10]	(2) ${S N R}_{A m p_R x} [d B] = S_{P o w e r_R x} - N F_{R x} - 10 \log_{10} (k_{B} B T)$	$k_{B}$ :	Boltzmann constant [ ${J K}^{- 1}$ ]
			$T$ :	Temperature [K]
			$B$ :	Total bandwidth [Hz]
Downconverter	${S N R}_{D C}$ [11]	(3) ${S N R}_{D C} [d B] = - 20 \log_{10} (2 π σ_{D C} f_{L O})$	$σ_{D C_L O}$ :	Jitter of DC LO [s]
			$σ_{U C_L O}$ :	Jitter of UC LO [s]
Upconverter	${S N R}_{U C}$ [11]	(4) ${S N R}_{U C} [d B] = - 20 \log_{10} (2 π σ_{U C} f_{L O})$	$f_{L O}$ :	Frequency of LO [Hz]
Quantization	${S N R}_{Q u a n t i z a t i o n}$ [12,13]	(5) ${S N R}_{Q u a n t i z a t i o n} [d B] = 6.02 n + 10 \log_{10} 3 - P A R$	$n$ :	Quantization bit
			PAR:	Peak-to-average power ratio [dB]
ADC	${S N R}_{A D C_J i t t e r}$ [14]	(6) ${S N R}_{A D C_j i t t e r} [d B] = - 20 \log_{10} (2 π σ_{A D C} f_{c})$	$σ_{A D C}$ :	Jitter of ADC [s]
			$σ_{D A C}$ :	Jitter of ADC [s]
DAC	${S N R}_{D A C_J i t t e r}$ [14]	(7) ${S N R}_{D A C_j i t t e r} [d B] = - 20 \log_{10} (2 π σ_{D A C} f_{c})$	$f_{c}$ :	Carrier frequency [Hz]
Optical link	${S N R}_{O p t i c a l_L i n k}$ [15]	(8) $S i g n a l P o w e r = \frac{V_{m a x}^{2} [{(2^{n})}^{2} - 1]}{3 \cdot {(2^{n})}^{2}}$	$P_{O p t i c a l_L i n k}$ :	BER of optical link
		(9) ${N o i s e P o w e r}_{O p t i c a l_L i n k} = \frac{4 \cdot V_{m a x}^{2} [{(2^{n})}^{2} - 1]}{3 \cdot {(2^{n})}^{2}} P_{O p t i c a l_L i n k}$	$V_{m a x}$ :	Maximum voltage of the sampled signal [V]
		(10) ${S N R}_{O p t i c a l_L i n k} = {\frac{S i g n a l P o w e r}{N o i s e P o w e r}}_{O p t i c a l_L i n k}$

Symbol	Quantity	Value
$S_{P o w e r_T x}$ [dBm]	Input signal power to Tx amp	−18.9
$S_{P o w e r_R x}$ [dBm]	Input signal power to Rx amp	−17.3
$N F_{T x}$ [dB]	Noise figure of Tx amp	6
$N F_{R x}$ [dB]	Noise figure of Rx amp	6
$k_{B}$ [ ${J K}^{- 1}$ ]	Boltzmann constant	$1.38 \times 10^{- 23}$
$T$ [K]	Temperature	300
$B$ [MHz]	Total bandwidth	54
$σ_{D C_L O}$ [ps]	Jitter of DC LO	0.2
$σ_{U C_L O}$ [ps]	Jitter of UC LO	0.2
$f_{L O}$ [MHz]	Frequency of LO	500
$f_{c}$ [MHz]	Carrier frequency	125
$n$	Quantization bit	3–18
PAR [dB]	Peak-to-average power ratio	14.33
$σ_{A D C}$ [ps]	Jitter of ADC	0.2
$σ_{D A C}$ [ps]	Jitter of DAC	0.2
$P_{O p t i c a l_L i n k}$	BER of optical link	$1.0 \times 10^{- 10}$

DRoF-based optical video re-transmission of commercial RF broadcast signals

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Figures (13)

Tables (2)

Equations (22)

Journal of Optical Communications and Networking