Gain‐clamping in L‐band zirconium–erbium co‐doped fiber amplifier with FBG based lasing control

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.

Download Full-text

Gain and Noise Figure Performances of L–Band EDFA with an Injection of C–Band ASE

Jurnal Teknologi ◽

10.11113/jt.v40.411 ◽

2012 ◽

Author(s):

Sulaiman Wadi Harun ◽

T. Subramaniam ◽

Nizam Tamchek ◽

Harith Ahmad

Keyword(s):

Spontaneous Emission ◽

Noise Figure ◽

Amplified Spontaneous Emission ◽

Fiber Amplifier ◽

Optical Amplifier ◽

Injection Technique ◽

Erbium Doped Fiber Amplifier ◽

Gain Enhancement ◽

Gain Clamping ◽

L Band

Kesan suntikan pancaran spontan terkuat (ASE) jalur–C terhadap prestasi jalur–L penguat gentian terdop–erbium (EDFA) ditunjukkan. Sebuah pekeliling dan parutan gentian Bragg lebar jalur luas digunakan untuk menyalurkan ASE jalur–C ke dalam sistem penguat. Dengan penyuntikan sejumlah kecil ASE (20 dB pelemahan dan lebih), gandaan isyarat kecil ditingkatkan tanpa peningkatan nilai hingar berbanding penguat tanpa suntikan ASE. Peningkatan gandaan maksimum adalah sebanyak 3.5 dB dan dicapai semasa pelemahan 20 dB untuk isyarat 1580 nm. Walau bagaimanapun, jika penguat disuntik dengan jumlah ASE yang besar (VOA=0 dB), gandaan penguat didapati mendatar pada 15.2 dB dari –40 hingga –10 dBm dengan variasi gandaan kurang daripada 0.3 dB. Kuasa tepu juga bertambah dari –8 dBm (semasa tiada ASE) kepada 2 dBm (VOA=0 dB) dengan sedikit peningkatan nilai hingar. Keputusan ini menunjukkan bahawa teknik menyuntik ASE boleh digunakan sama ada untuk meningkatkan gandaan atau untuk menetapkan nilai gandaan dalam EDFA jalur–L. Kata kunci: Penetapan gandaan, penguat optik, EDFA jalur-L, penambahan gandaan, pancaran spontan terkuat The effect of injecting conventional band amplified spontaneous emission (C–band ASE) on the performance of long wavelength band erbium–doped fiber amplifier (L–band EDFA) is demonstrated. A circulator and a broadband fiber Bragg grating (FBG) were used to route a C–band ASE into amplifier system. Injection of 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 for signal wavelength of 1580 nm. At very large amount of ASE injection (VOA=0 dB), the gain of the amplifier is clamped at 15.2 dB from –40 to –10 dBm with a gain variation of less than 0.3 dB. The saturation power is also increased from –8 dBm (for without ASE injection) to 2 dBm (VOA=0 dB) with a slight noise figure penalty. These results show that the ASE injection technique can be used either for gain improvement or gain clamping in L–band EDFA. Keywords: Gain clamping, optical amplifier, L-band EDFA, gain enhancement, amplified spontaneous emission

Download Full-text