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Frequency-Tunable Parity-Time-Symmetric Optoelectronic Oscillator Using a Polarization-Dependent Sagnac Loop

A widely frequency-tunable parity-time (PT) symmetric optoelectronic oscillator (OEO) implemented based on a single polarization-dependent Sagnac loop is proposed and experimentally demonstrated. Two mutually coupled feedback loops having an identical geometry with balanced gain and loss are implemented to achieve PT-symmetry, which is essential for single-mode selection without using an ultra-narrow passband microwave filter. In the implementation, a Sagnac loop consisting of a polarization beam splitter (PBS) and two polarization controllers (PCs) is employed which functions equivalently as two mutually coupled feedback loops, with the gain, loss and coupling coefficient being independently controllable. Since only a single physical loop is used, the implementation is greatly simplified and the stability is highly improved. The operation of the proposed OEO is experimentally verified. Stable single-mode oscillation with a wide frequency tunable range from 2 to 12 GHz is achieved. The phase noise is -128 dBc/Hz at an offset frequency of 10 kHz.

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Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.38 No.19 October 1 2020

No. Panggil

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Penerbit

: .,

Deskripsi Fisik

p. 5327 - 5332

Bahasa

English

ISBN/ISSN

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Klasifikasi

-

Tipe Isi

-

Tipe Media

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Tipe Pembawa

-

Edisi

-

Subjek

SAGNAC LOOP
OPTOELECTRONIC OSCILLATOR
PARITY-TIME SYMMETRY
FREQUENCY TUNABILITY

Info Detail Spesifik

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Pernyataan Tanggungjawab

Zheng Dai, Zhiqiang Fan, Peng Li, Jianping Yao

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