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

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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DOUBLE PASS S-BAND EDFA

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863506003347 ◽

2006 ◽

Vol 15 (03) ◽

pp. 303-307

Author(s):

HARITH AHMAD ◽

SULAIMAN WADI HARUN

Keyword(s):

Pump Power ◽

Short Wavelength ◽

Fiber Amplifier ◽

Small Signal Gain ◽

Small Signal ◽

Double Pass ◽

Erbium Doped Fiber Amplifier ◽

Single Pass ◽

Gain Enhancement ◽

Erbium Doped

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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Single Stage C-Band Erbium-Doped Fiber Amplifier (EDFA) Development and Performance Evaluation

International Journal on Measurement Technologies and Instrumentation Engineering ◽

10.4018/ijmtie.2018070103 ◽

2018 ◽

Vol 7 (2) ◽

pp. 41-49

Author(s):

Sami D. Alaruri

Keyword(s):

Conversion Efficiency ◽

Noise Figure ◽

Fiber Amplifier ◽

Single Stage ◽

Erbium Doped Fiber Amplifier ◽

Signal Gain ◽

Laser Pump ◽

Mathematical Expressions ◽

Erbium Doped ◽

And Performance

In this work, a single-stage C-band erbium-doped fiber amplifier (EDFA) has been constructed and characterized. Gain (G) and noise figure (NF) measurements collected for the C-band EDFA as a function of wavelength (1528.8 to 1562.3 nm) and laser pump powers are discussed. Further, the EDFA conversion efficiency (CE) as a function of laser pump powers is presented. Simplified mathematical expressions for the EDFA gain, NF, and CE are provided. The C-band EDFA signal gain remained flat in the spectral region 1539 to 1562 nm. Moreover, the C-band EDFA NF increased with wavelength and decreased with the 1480 nm laser pump powers. Additionally, the C-band EDFA maximum achieved conversion efficiency and signal gain is 22.64% at P1=19.49 mW and 22.6 dB at 1531.1 nm, respectively.

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