Efficient coupling for bidirectional pumping in EDFA with two mutually-pumped phase-conjugate mirrors

Shugo Kano; Atsushi Okamoto; Yoshihisa Takayama; Kunihiro Sato

doi:10.1117/12.722961

8 May 2007 Efficient coupling for bidirectional pumping in EDFA with two mutually-pumped phase-conjugate mirrors

Shugo Kano, Atsushi Okamoto, Yoshihisa Takayama, Kunihiro Sato

Proceedings Volume 6582, Nonlinear Optics and Applications II; 65821U (2007) https://doi.org/10.1117/12.722961
Event: International Congress on Optics and Optoelectronics, 2007, Prague, Czech Republic

Abstract

We propose a new LD-fiber-coupling-method for bidirectionally-pumped erbium-doped fiber amplifier (EDFA) using two mutually-pumped phase-conjugate mirrors (MPPCMs). MPPCM is formed by two mutually incoherent beams in photorefractive crystal (PRC) and can convert each incident beam into each phase-conjugate beam of them. Owing to mode conversion by phase-conjugate characteristics, the coupling loss due to mode mismatching between a pump beam and a fiber is improved. Therefore, precision lens and lensed fiber for mode matching are not required. Additionally, because photorefractive index gratings that compose a MPPCM are rewritable in real time, MPPCM can dynamically adapt to a variety of system error factors, such as misalignment of components, mode conversion generated by LDs or fibers with defects. In our system, the overall coupling efficiency of pump beams is mainly determined by diffraction efficiency of MPPCMs that depends on the photorefractive coupling strength and the intensity ratio of two incident beams. However, achievable diffraction efficiency in this system is restricted by optical loss between two MPPCMs. This is because the transmitted pump beams passing through the EDF are reused for forming the opposite MPPCM. To achieve a high signal amplification gain, absorption loss of pump beam powers in the EDF is unavoidable. Therefore, we analytically and experimentally evaluate the acceptable loss between two PRCs to form both MPPCMs.

Citation Download Citation

Shugo Kano, Atsushi Okamoto, Yoshihisa Takayama, and Kunihiro Sato "Efficient coupling for bidirectional pumping in EDFA with two mutually-pumped phase-conjugate mirrors", Proc. SPIE 6582, Nonlinear Optics and Applications II, 65821U (8 May 2007); https://doi.org/10.1117/12.722961

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