DOUBLE PASS S-BAND EDFA

A double-pass erbium-doped fiber amplifier (EDFA) based on a depressed cladding erbium-doped fiber, which operates in the short wavelength (S-band) region is proposed and demonstrated. This amplifier provides a small signal gain as high as 30 dB at 1500 nm, using only 15 m depressed cladding erbium-doped fiber (EDF) and 130 mW of 980 nm pump power. Compared to the single-pass configuration, this amplifier shows a gain enhancement of about 14 dB for pump powers above 120 mW. However, noise figures penalties of less than 0.9 dB are obtained for these pump powers. The proposed double-pass amplifier will play an important role in the development of a practical S-band EDFA from the perspective of economical usage of EDF and pump power.

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L-BAND EDFA WITH INJECTION OF C-BAND ASE

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863504001888 ◽

2004 ◽

Vol 13 (02) ◽

pp. 315-319

Author(s):

S. W. HARUN ◽

H. AHMAD

Keyword(s):

Noise Figure ◽

Fiber Amplifier ◽

Injection Technique ◽

Small Signal Gain ◽

Small Signal ◽

Erbium Doped Fiber Amplifier ◽

Gain Variation ◽

Erbium Doped ◽

Gain Clamping ◽

L Band

The effect of injecting of C-band amplified spontaneous emission (ASE) from C-band erbium-doped fiber amplifier (EDFA) on the performance of L-band EDFA is demonstrated using a circulator and broadband fiber Bragg grating (FBG). Injecting a large amount of ASE (VOA=0 dB) clamps the gain at 15.2 dB from -40 to -10 dBm with a gain variation of less than 0.3 dB. Injecting a small amount of ASE (attenuation of 20 dB and above) improves the small signal gain with a negligible noise figure penalty compared to that of an amplifier without the ASE injection. A maximum gain improvement of 3.5 dB is obtained at an attenuation of 20 dB. These results show that the ASE injection technique can be used either for gain improvement or gain clamping in L-band EDFA.

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Effect of Er+3 Concentration on the Small Signal Gain Coefficient and the Gain in the Erbium Doped Fiber Amplifier

Research Journal of Applied Sciences Engineering and Technology ◽

10.19026/rjaset.7.656 ◽

2014 ◽

Vol 7 (15) ◽

pp. 3164-3170 ◽

Cited By ~ 1

Author(s):

O. Mahran ◽

Mohammed S. Helmi ◽

Gamal D. Roston ◽

Naglaa El. Sayed ◽

Engy M. Gerges

Keyword(s):

Fiber Amplifier ◽

Gain Coefficient ◽

Small Signal Gain ◽

Small Signal ◽

Erbium Doped Fiber Amplifier ◽

Signal Gain ◽

Erbium Doped

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Gain Enhancement in L–Band EDFA by Splitting EDF into Two Stages

Jurnal Teknologi ◽

10.11113/jt.v39.463 ◽

2012 ◽

Author(s):

Sulaiman Wadi Harun ◽

Harith Ahmad

Keyword(s):

Pump Power ◽

Noise Figure ◽

Fiber Amplifier ◽

Optical Amplifier ◽

Erbium Doped Fiber Amplifier ◽

Gain Enhancement ◽

Erbium Doped ◽

Dual Stage ◽

L Band ◽

Two Stages

Sebuah esperimen bagi menambah daya pembesaran untuk jalur gelombang panjang (jalur–L) pembesar terdop erbium (PTE) telah didemonstrasi menggunakan reka bentuk yang berbadan dua. Jika dibandingkan dengan pembesar yang berbadan satu, pembesar ini dapat menambah pembesaran untuk isyarat 1580 nm sebanyak 5.5 dB dengan sedikit sahaja penambahan nilai bisingan. Nilai bisingan bertambah sebanyak 0.3 dB kerana kemasukan isolator dalam reka bentuk. Kadar kuasa pam pertama mestilah 33% daripada jumlah keseluruhan kuasa pam untuk nilai optima. Pembesaran maksimum sebanyak 8.3 dB telah diperolehi oleh isyarat 1568 nm semasa kuasa isyarat dan kuasa pam, masing–masing ditetapkan pada 30 dBm dan 92 mW. Keputusan esperimen menunjukkan penggunaan pembesar berbadan dua dapat menjimatkan kos kerana ia menggunakan kuasa pam yang lebih rendah. Kata kunci: Gentian terdop erbium, pembesar optik, pembesar terdop erbium, jalus LPTE An experiment on gain enhancement in the long–wavelength band erbium–doped fiber amplifier (L–band EDFA) is demonstrated using a dual stage configuration. Compared to a conventional single–stage amplifier, the small signal gain for a 1580 nm signal can be improved by 5.5 dB without paying much noise figure penalty. The corresponding noise figure penalty was 0.3 dB due to the insertion loss of the optical isolator. The optimum pump power ratio for the first pump was experimentally determined to be 33%. The maximum gain improvement of 8.3 dB was obtained at a signal wavelength of 1568 nm while signal and total pump powers were fixed at –30 dBm and 92 mW, respectively. These results show that the employment of the dual–stage amplifier system will play an important role in the development of a practical L–band EDFA from the perspective of economical usage of pump power. Key words: Erbium doped fiber, optical amplifier, L-band EDFA, dual-stage EDFA, amlified spontaneous emission

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Gain Enhancement in Double-pass Erbium-doped Fiber Amplifier

Optical Communications and Networks ◽

10.1142/9789812776280_0019 ◽

2002 ◽

Author(s):

K. F. Chang ◽

P. Poopalan ◽

T. C. Teyo ◽

T. Subramaniam ◽

H. Ahmad

Keyword(s):

Fiber Amplifier ◽

Double Pass ◽

Erbium Doped Fiber Amplifier ◽

Gain Enhancement ◽

Erbium Doped

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EDFA and EDFL Review

Cases on ICT Utilization, Practice and Solutions ◽

10.4018/978-1-60960-015-0.ch015 ◽

2011 ◽

pp. 253-266

Author(s):

Belloui Bouzid

Keyword(s):

Output Power ◽

Noise Figure ◽

Fiber Amplifier ◽

High Gain ◽

Theoretical Background ◽

Double Pass ◽

Erbium Doped Fiber Amplifier ◽

Single Pass ◽

Erbium Doped ◽

A New Technique

In this chapter, I propose a comprehensive study of erbium-doped fiber amplifier (EDFA) and erbium doped fiber laser (EDFL). The chapter is based on three principal levels: the first is at the atomic level, where it is evident and meaningful to give general and deep studies on erbium spectra at theoretical background angle. The important part that needs to be understood in the erbium is its energy level splitting and lasing. The second level is based on the EDFA and EDFL critical, where many research papers have been reviewed to show and clarify their strong and weak side at different views. To specify the weakness of the classical EDFA and EDFL, and to describe the future generations and its characteristics, it is very important to review the recent published papers and books. At the experimental level a full investigation is given. Vast and new designs were invented showing high-gain and low-noise-figure (NF) utilizing a new technique called double pass with filter. An efficient amplification occurs at the signal wavelength of 1550 nm when it travels along the design quadruple pass double stages with filter amplifier (QPDSF). The highest gain of 62.56 dB with a low NF of 3.98 dB was achieved for an input signal power of -50 dBm and pump powers of 10 and 165 mW in the second and first stage amplifiers respectively. This important result shows also, a large difference of 40 dB gain between the QPDSF and the single stage single pass (SPSS) EDFA configuration. This design is used to show high gain of 62.56 dB compared to SPSS which records only 20 dB. A higher power and wider spectrum of ASE is observed for the double pass compared with single pass. A comparative investigation is presented and analyzed for various configurations. At the end, a high output power EDFL configuration is reported. It incorporates a double stages linear cavity with fiber loopback and a tunable bandpass filter TBF. The configuration increases the output power by suppressing the amplified spontaneous emission and achieves a highly stable output power of more than 18 dBm at 1560 nm. A standard spectrum is attained with TBF adjustment.

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Efficient and Compact Optical Amplifier Using EYDF

IIUM Engineering Journal ◽

10.31436/iiumej.v8i2.89 ◽

2010 ◽

Vol 8 (2) ◽

pp. 17-23

Author(s):

Sulaiman Wadi Harun ◽

K. Dimyati ◽

M. R. Tamjis ◽

S. Z. Muhd-Yassin ◽

M. K. Abd-Rahman ◽

...

Keyword(s):

Energy Transfer ◽

Doping Concentration ◽

Noise Figure ◽

Fiber Amplifier ◽

Optical Amplifier ◽

Concentration Quenching ◽

Small Signal Gain ◽

Small Signal ◽

Double Pass ◽

Erbium Doped

An efficient Erbium/Ytterbium doped fiber amplifier (EYDFA) is demonstrated using a 1058nm pumping wavelength, where the amplification is assisted by energy transfer between Yb and Er ions. The energy transfer increases the limit of erbium doping concentration that is imposed by concentration quenching in Erbium-doped fiber (EDF). Therefore, the gain and noise figure are severely degraded with 1480 nm pumping, where the energy transfer cannot be achieved. The use of optical isolator improves the small signal gain and noise figure by about 4.8 dB and 1.6 dB, respectively. By employing a double-pass configuration, a higher gain can be obtained with an expense of a noise figure penalty. The gain improvement of 17.0 dB is obtained at 20 mW and -50 dBm of pump and input signal powers. This shows that the double-pass configuration is an important aspect to consider when designing an efficient EYDFA.

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