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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Multi-span transmission using phase and amplitude regeneration in PPLN-based PSA.

T Umeki¹, M Asobe, H Takara

¹NTT Photonics Labs, NTT Corporation,3-1, Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198 Japan. umeki.takeshi@lab.ntt.co.jp

|August 14, 2013

Summary

This study shows a phase sensitive amplifier (PSA) can regenerate signals, enabling 5400 km transmission of 28-Gb/s binary phase shift keying (BPSK) signals. This technology overcomes impairments from fiber nonlinearity and amplified spontaneous emission (ASE).

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Area of Science:

Optical Communications
Nonlinear Optics
Photonics

Background:

Ultra-long-haul optical transmission systems face signal degradation from fiber nonlinearities and amplifier noise.
Existing amplification techniques struggle to effectively suppress phase noise and regenerate signal amplitude.

Purpose of the Study:

To demonstrate the efficacy of a periodically poled Lithium Niobate (PPLN) based phase sensitive amplifier (PSA) for ultra-long-haul optical data transmission.
To evaluate the PSA's capability for simultaneous phase and amplitude regeneration in a recirculating fiber loop.

Main Methods:

Implementation of an in-line PSA with integrated carrier recovery and phase locking within a recirculating fiber loop.
Utilizing a periodically poled Lithium Niobate (PPLN) device as the core component of the phase sensitive amplifier (PSA).
Transmission of a 28-Gb/s binary phase shift keying (BPSK) signal over extended distances.

Main Results:

Achieved a significant PSA on-chip gain of up to +18 dB and an external black-box gain of +12 dB.
Demonstrated substantial suppression of phase noise induced by fiber nonlinearity and intensity noise from amplified spontaneous emission (ASE).
Successfully transmitted a 28-Gb/s BPSK signal over 5400 km, showcasing the PSA's regeneration capabilities.

Conclusions:

The PPLN-based PSA effectively regenerates both phase and amplitude, mitigating key impairments in optical transmission.
This technology enables robust ultra-long-haul transmission, paving the way for future high-capacity optical networks.
The PSA acts as a crucial repeater, overcoming limitations of traditional optical amplifiers.