• Title/Summary/Keyword: RSOA

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Theoretical Analysis of the Optical Filtering Effect on a Directly Modulated Reflective Semiconductor Optical Amplifier

  • Shin, Beomsoo;Oh, Sangyeol;Lee, Jaehoon
    • IEIE Transactions on Smart Processing and Computing
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    • v.5 no.1
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    • pp.5-9
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    • 2016
  • The modulation bandwidth of a reflective semiconductor optical amplifier (RSOA) is limited by carrier lifetime. Therefore, it is hard to directly modulate an RSOA with high-speed electrical signals. We theorize that an optical filter can act as an optical equalizer, compensating for the narrow bandwidth limitation imposed by the RSOA. By modeling a time-varying RSOA with a modified transfer matrix method (TMM), we simulated 25 Gbps operation of an RSOA with optical filtering effects. We investigated the impact of detuning the center wavelength of the optical filter on the modulation of an RSOA. The numerical results show that it is possible to modulate an RSOA with an optical filtering effect at 25 Gbps without electronic equalization or digital signal processing.

Tunable Photonic Microwave Band-pass Filter with High-resolution Using XGM Effect of an RSOA

  • Kwon, Won-Bae;Lee, Chung Ghiu;Seo, Dongjun;Park, Chang-Soo
    • Current Optics and Photonics
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    • v.2 no.6
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    • pp.563-567
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    • 2018
  • We propose and experimentally demonstrate a simple tunable photonic microwave band-pass filter with high resolution using a reflective semiconductor optical amplifier (RSOA) and an optical time-delay line. The RSOA is used as a gain medium for generating cross-gain modulation (XGM) effect as well as an optical source. The optical source provides narrow spectral width by self-injection locking the RSOA in conjunction with a partial reflection filter with specific center wavelength. Then, when the RSOA is operated in the saturation region and the modulated recursive signal is injected into the RSOA, the recursive signal is inversely copied to the injection locked optical source due to the XGM effect. Also, the tunability of the passband of the proposed microwave filter is shown by controlling an optical time-delay line in a recursive loop.

RSOA-Based Wavelength-Reuse Gigabit WDM-PON

  • Kim, Byoung-Whi
    • Journal of the Optical Society of Korea
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    • v.12 no.4
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    • pp.337-345
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    • 2008
  • This article presents the RSOA-based re-modulation schemes for practical application to the WDM-PON link. Emphasis is put on the three methods for reducing the residual downstream signal in the upstream transmission; the simplest one is to use the RSOA gain-saturation property, the second uses selective filtering of the adiabatic-chirped DFB-LD output spectrum, and the last uses a dynamic RSOA gain control by varying its driving current according to the incident binary signal. The reflection sensitivity in the proposed re-modulation link is also qualitatively presented in the cases of using two different types of seed light: coherent light from DFB-LD array and spectrum-sliced incoherent ASE light. We show experimental results of an error-free bidirectional gigabit transmission over 20 km at -30 dB reflection with the spectrum-sliced ASE seed light.

Demonstration of RSOA based Bidirectional WDM-POM by using Suppressed Optical Carrier Modulation (RSOA기반 반송파 억제된 광변조를 이용한 양방향 WDM-PON 구현)

  • Kim, Dong-Hyeon;Lee, Dae-Won;Won, Young-Wuk;Park, Soo-Jin;Han, Sang-Kook
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.12B
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    • pp.809-814
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    • 2007
  • In this paper, we proposed new method of a bidirectional WDM-PON transmission using suppressed optical carreir(SOC) and reflective semi-conductor optical amplifier(RSOA) based on WDM-PON. while LiNbO3 mach zehnder modulator(LN-MZM) generates 5GHz modulated SOC for uplink at central office(CO), RSOA at CO modulates the downstream data. At optical network units(ONUs), Another RSOA modulates the SOC light source for uplink at ONU and uplink data are up-converted to the 5 GHz already modulated SOC using LN-MZM.

The performance analysis of Reflective Semiconductor Optical Amplifier Modulator in WDM-PON system (파장분할다중 광가입자망을 위한 반사형 반도체 광증폭기 변조 성능 분석)

  • Shim Woo-Jin;Shin Yong-Sik;Park Yong-Gil
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • v.4 no.1
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    • pp.15-21
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    • 2005
  • One of the core technology in WDM-PON system is a generation and modulation technique of the optical source in Optical Network Unit (ONU). In this paper, we propose a reflective semiconductor optical amplifier (RSOA) as a modulator in WDM-PON system. Its performance is analyzed by simulation and actual experimentation. Using RSOA in WDM-PON system as a modulator, it obtains higher gain compared to the conventional SOA due to the double pass gain effect. Furthermore RSOA can provide high gain with comparatively low input power. This is very helpful when we set up the actually system because using lower input power, it can reduce the load of the driving circuit which makes very economical module structure. Therefore, when RSOA is used as a modulator, not only it gives noise suppression effect, but also provides certain amount of gain as well. In addition, comparing with conventional SOA which gives fairly large insertion loss, RSOA can provides more important merits.

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Photonic Microwave Notch Filter with Negative Coefficient Using Reflective Semiconductor Optical Amplifier (반사형 반도체 광 증폭기를 이용한 음계수를 가지는 광 마이크로파 노치 필터)

  • Kwon, Won-Bae;Choi, Yong-Kyu;Kim, Junsu;Kim, Kyung-Ho;Jeong, Min-A;Lee, Seong Ro;Park, Chang-Soo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39C no.5
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    • pp.418-424
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    • 2014
  • We propose and experimentally demonstrate a photonic microwave notch filter with a negative coefficient. The negative coefficient is obtained by using cross gain modulation (XGM) in a reflective semiconductor optical amplifier (RSOA). When the RSOA is operated in saturated region, the signal carried on the pump wavelength is inversely copied to the probe wavelength by the XGM effect, showing a negative coefficient. Time delay between pump signal and probe signal is provided by single mode fiber (SMF) with wavelength dependent time delay. The proposed microwave notch filter shows notch dips of more than 35.1 dB and free spectral range (FSR) of about 380.6 MHz.

Broadcast Signal Transmission on a WDM-PON System Using a Polarization Independent RSOA and a Broadband ASE Light Source (광대역 ASE 광원과 PI-RSOA를 이용한 WDM-PON 시스템에서의 방송 신호 전송)

  • Oh, Yeong Guk;Lee, Hyuek Jae
    • Korean Journal of Optics and Photonics
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    • v.23 no.6
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    • pp.264-268
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    • 2012
  • In this paper, we propose a new method for broadcasting in a WDM-PON system which has the merits of a simple and cost effective structure. It can be constructed using only an ASE (Amplified Spontaneous Emission) light source and a PI-RSOA (Polarization Independent - Reflective Semiconductor Optical Amplifier). Error-free broadcast signal transmission over 30 Km for 24 channels at 1.25 Gb/s has been successfully demonstrated.

Tunable Photonic Microwave Delay Line Filter Based on Fabry-Perot Laser Diode

  • Heo, Sang-Hu;Kim, Junsu;Lee, Chung Ghiu;Park, Chang-Soo
    • Current Optics and Photonics
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    • v.2 no.1
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    • pp.27-33
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    • 2018
  • We report the physical implementation of a tunable photonic microwave delay line filter based on injection locking of a single Fabry-Perot laser diode (FP-LD) to a reflective semiconductor optical amplifier (RSOA). The laser generates equally spaced multiple wavelengths and a single tapped-delay line can be obtained with a dispersive single mode fiber. The filter frequency response depends on the wavelength spacing and can be tuned by the temperature of the FP-LD varying lasing wavelength. For amplitude control of the wavelengths, we use gain saturation of the RSOA and the offset between the peak wavelengths of the FP-LD and the RSOA to decrease the amplitude difference in the wavelengths. From the temperature change of total $15^{\circ}C$, the filter, consisting of four flat wavelengths and two wavelengths with slightly lower amplitudes on both sides, has shown tunability of about 390 MHz.

2.5 Gbps Hybrid PON link Using RSOA Based WDM-PON and a Reach Extender (RSOA기반 WDM-PON 링크와 Reach Extender를 이용한 2.5 Gbps 하이브리드 PON 링크 기술)

  • Kim, Kwang-Ok;Lee, Jie-Hyun;Lee, Sang-Soo;Jang, Youn-Seon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.6B
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    • pp.583-591
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    • 2011
  • We presents the architecture of the 2.5 Gbps hybrid PON link which can increase of the transmission distance and link capability, and split ratio by using a colorless DWDM-PON and O/E/O based reach extender into an existing G-PON link. A RSOA based DWDM-PON to apply the feeder fiber can provide a link capacity of 32 larger that of a legacy G-PON. The reach extender converts the wavelength of DWDM-PON to G-PON through GTC frame regeneration at the remote node, and can provide a burst reset signal in order to extract upstream burst signal, simultaneously. The proposed hybrid PON enable a legacy G-PON to operate over the maximum 60 km distance with a 128-way split per WDM wavelength.

1Gbps x 16ch WDM-PON Field trial Based on RSOA Remodulation (RSOA 재변조 방식 기반의 1Gbpsx16 채널 WDM-PON 필드 테스트)

  • Kim, Geun-Yeong;Park, Hyeong-Jin;Park, Geun-Yeol;Park, Jae-Hyeong;Yun, Ho-Seong;Kim, Jong-An;Kim, Jin-Hui
    • Proceedings of the Optical Society of Korea Conference
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    • 2008.07a
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    • pp.421-422
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    • 2008
  • In this paper, we will present the results of 1Gbps x 16 channels RSOA remodulation based WMD-PON field trial test. We have confirmed the system reliability, also verified the system could reliably deliver the service such as internet, VoD through the system during the field trial test.

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