Frequency microcomb distillation for optical superchannel transmission

Frequency comb distillation for optical superchannel transmission

10.31219/osf.io/gfamh ◽

2021 ◽

Author(s):

David Moss

Keyword(s):

Frequency Comb ◽

Signal To Noise Ratio ◽

Local Oscillator ◽

Optical Signal ◽

Microring Resonator ◽

Optical Systems ◽

Light Sources ◽

Optical Noise ◽

Multi Wavelength ◽

Wavelength Light

Microcombs provide a potential compact and efficient light source for multi-Terabit-per-second optical superchannels. However, as the bandwidth of these multi-wavelength light sources is increased, this can result in low per-line power. Optical amplifiers can be used to overcome power limitations, but the accompanying spontaneous optical noise can degrade performance in optical systems. To overcome this issue, we propose wideband noise reduction for comb lines using a high-Q microring resonator, whose resonances align with comb lines. When applying the proposed distillation to a superchannel system with 18 Gbaud, 64-QAM sub-channels in a > 10 Tb/s optical superchannel, we find that noise-corrupted comb lines can reduce the optical signal-to-noise ratio required for the comb by ~ 9 dB when used as optical carriers at the transmitter side, and by ~ 12 dB when used as a local oscillator at the receiver side.

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Optical frequency microcomb distillation for super channel data transmission

10.36227/techrxiv.14073860.v1 ◽

2021 ◽

Author(s):

David Moss

Keyword(s):

Signal To Noise Ratio ◽

Local Oscillator ◽

Optical Signal ◽

Microring Resonator ◽

Optical Systems ◽

Light Sources ◽

Optical Noise ◽

High Q ◽

Multi Wavelength ◽

Wavelength Light

Microcombs provide a potential compact and efficient light source for multi-Terabit-per-second optical superchannels. However, as the bandwidth of these multi-wavelength light sources is increased, this can result in low per-line power. Optical amplifiers can be used to overcome power limitations, but the accompanying spontaneous optical noise can degrade performance in optical systems. To overcome this issue, we propose wideband noise reduction for comb lines using a high-Q microring resonator, whose resonances align with comb lines. When applying the proposed distillation to a superchannel system with 18 Gbaud, 64-QAM sub-channels in a > 10 Tb/s optical superchannel, we find that noise-corrupted comb lines can reduce the optical signal-to-noise ratio required for the comb by ~ 9 dB when used as optical carriers at the transmitter side, and by ~ 12 dB when used as a local oscillator at the receiver side.

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Optical Frequency Microcomb Distillation for Super Channel Data Transmission

10.20944/preprints202102.0507.v1 ◽

2021 ◽

Author(s):

Chawaphon Prayoonyong ◽

Andreas Boes ◽

Xingyuan Xu ◽

Mengxi Tan ◽

Sai T. Chu ◽

...

Keyword(s):

Signal To Noise Ratio ◽

Local Oscillator ◽

Optical Signal ◽

Microring Resonator ◽

Optical Systems ◽

Light Sources ◽

Optical Noise ◽

High Q ◽

Multi Wavelength ◽

Wavelength Light

Microcombs provide a potential compact and efficient light source for multi-Terabit-per-second optical superchannels. However, as the bandwidth of these multi-wavelength light sources is increased, this can result in low per-line power. Optical amplifiers can be used to overcome power limitations, but the accompanying spontaneous optical noise can degrade performance in optical systems. To overcome this issue, we propose wideband noise reduction for comb lines using a high-Q microring resonator, whose resonances align with comb lines. When applying the proposed distillation to a superchannel system with 18 Gbaud, 64-QAM sub-channels in a > 10 Tb/s optical superchannel, we find that noise-corrupted comb lines can reduce the optical signal-to-noise ratio required for the comb by ~ 9 dB when used as optical carriers at the transmitter side, and by ~ 12 dB when used as a local oscillator at the receiver side.

Download Full-text

Optical frequency microcomb distillation for super channel data transmission

10.36227/techrxiv.14073860 ◽

2021 ◽

Author(s):

David Moss

Keyword(s):

Signal To Noise Ratio ◽

Local Oscillator ◽

Optical Signal ◽

Microring Resonator ◽

Optical Systems ◽

Light Sources ◽

Optical Noise ◽

High Q ◽

Multi Wavelength ◽

Wavelength Light

Microcombs provide a potential compact and efficient light source for multi-Terabit-per-second optical superchannels. However, as the bandwidth of these multi-wavelength light sources is increased, this can result in low per-line power. Optical amplifiers can be used to overcome power limitations, but the accompanying spontaneous optical noise can degrade performance in optical systems. To overcome this issue, we propose wideband noise reduction for comb lines using a high-Q microring resonator, whose resonances align with comb lines. When applying the proposed distillation to a superchannel system with 18 Gbaud, 64-QAM sub-channels in a > 10 Tb/s optical superchannel, we find that noise-corrupted comb lines can reduce the optical signal-to-noise ratio required for the comb by ~ 9 dB when used as optical carriers at the transmitter side, and by ~ 12 dB when used as a local oscillator at the receiver side.

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Active Optical Signal Conditioning and Monitoring System

10.21203/rs.3.rs-1134446/v1 ◽

2021 ◽

Author(s):

Kalipada Chatterjee ◽

Subrat Sahu ◽

Venugopal Arumuru ◽

Rajan jha

Keyword(s):

Real Time ◽

Signal To Noise Ratio ◽

Optical Signal ◽

Wide Frequency Range ◽

Optical Systems ◽

Signal Conditioning ◽

Time Modulation ◽

Response Enhancement ◽

Signal Monitoring ◽

External Stimuli

Abstract An optical signal conditioning technique for dynamic modulation of signals and real-time monitoring of events is pivotal for developing various optical systems at micro/nano dimensions. The utilities of such technique include controllable signal enhancement and distinctive response towards external stimuli, with reconfigurable operational range. Here, we propose and demonstrate an optical technique based on the parallel integration of fiber modal interferometers for optical response enhancement and multi-signal monitoring. Overlap of the interferometers’ characteristic spectra facilitates controllable signal filtering, attenuation, and amplification of interferometer’s response towards dynamic field over wide frequency range of 1 Hz – 1 kHz. Signal to noise ratio (SNR) enhancement of 9 dB is achieved by applying 1 volt about the reference interferometer. The system enables real-time modulation of optical signals and multipoint signal monitoring using machine learning for various applications such as mechanical vibrations, acoustic fields, biological samples, fluid movement, and other similar dynamic fields.

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Coherent optical signal processing using optical frequency combs

IEEE Avionics, Fiber-Optics and Photonics Digest CD ◽

10.1109/avfop.2012.6344059 ◽

2012 ◽

Author(s):

Peter J. Delfyett ◽

M. Bagnell ◽

S. Bhooplapur ◽

J. Davila-Rodriguez ◽

N. Hoghooghi ◽

...

Keyword(s):

Signal Processing ◽

Optical Signal Processing ◽

Optical Signal ◽

Optical Frequency ◽

Optical Frequency Combs ◽

Frequency Combs

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Carrier-Assisted Phase Retrieval

10.36227/techrxiv.17170814 ◽

2021 ◽

Author(s):

Qi Wu

Keyword(s):

Phase Retrieval ◽

Forward Error Correction ◽

Signal To Noise Ratio ◽

Single Mode ◽

Local Oscillator ◽

Optical Signal ◽

Single Mode Fiber ◽

Critical Parameters ◽

Hardware Complexity ◽

Full Field

Phase-retrieval (PR) schemes based on the modified Gerchberg-Saxton (GS) algorithm capture the full-field employing a dispersive element and intensity-only measurements to eliminate the use of a local oscillator. In this work, we propose two carrier-assisted PR schemes, namely central carrier-assisted PR (CCA-PR) and edge carrier-assisted PR (ECA-PR), to improve the comprehensive performance of PR receiver in terms of convergence speed, redundancy, and computational complexity. The proposed CCA-PR recovers the electrical field employing a reference carrier at 0 GHz with several iterations between two projection planes. It avoids pilot symbols and digital backpropagation to the transmitter and offers a flexible electrical bandwidth requirement compared with conventional PR schemes. To lower the carrier-to-signal power ratio (CSPR) requirement and enable faster convergence for the carrier-assisted PR schemes, the ECA-PR is proposed to obtain the initial phase for the GS algorithm. We numerically characterize the performance of the two schemes and experimentally demonstrate them for 30 GBaud 16-quadrature amplitude modulation (16-QAM) transmission over 80 km single-mode fiber with a bit error rate (BER) below the threshold of 7% hard-decision forward error correction (HD-FEC). Several critical parameters are analyzed, including the applied dispersion value, CSPR, and electrical bandwidth. Moreover, we compare the hardware complexity and optical signal-to-noise ratio (OSNR) sensitivity of proposed PR schemes with mainstream field recovery schemes.

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