Coherent optical spectrum analyzer

Baney, D.M.; Szafraniec, Bogdan; Motamedi, Ali

doi:10.1109/68.986811

Cited by 79 publications

(34 citation statements)

References 3 publications

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“…RBW filter filtering wideband coherent signals can be equivalent to an OENF whose center is located at the wavelength of LO. The transfer function of RBW filter in frequency domain and envelop function of OENF in time domain keeps the same shape when LO linearly sweeps and the bandwidth of RBW filter is wide enough to contain a few ten periods of coherent signal [16,17]. Figure 1 (b) also indicates LO wavelength and corresponding OENF of six points in time domain during sweep.…”

Section: Principle Of Oenfmentioning

confidence: 89%

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An optoelectronic equivalent narrowband filter for high resolution optical spectrum analysis

Feng

Dang

et al. 2017

Preprint

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To achieve a narrow bandwidth optical filter with a wide swept range for new generation optical spectrum analysis (OSA) of high performance optical sensors, an optoelectronic equivalent narrowband filter (OENF) is investigated and a swept optical filter with bandwidth of several MHz and swept range of several ten nanometers is built using electric filters and a swept laser as local oscillator (LO). The principle of OENF is introduced and analysis of OENF system is presented. Two electric filters are optimized to be RBW filters for high and medium spectral resolution application. Both simulations and experiments are conducted to verify OENF principle and results show that power uncertainty is less than 1.2% and spectral resolution can reach 6 MHz. Then, a real-time wavelength calibration system consisting of HCN gas cell and Fabry-Pérot etalon is proposed to guarantee a wavelength accuracy of ±0.4 pm at C-band and to reduce the influence of phase noise and nonlinear velocity of swept LO. Finally, experiments on OSA of actual spectra of various optical sensors using OENF system are conducted. Experimental results indicate that OENF system has an excellent capacity in analysis of fine spectrum structures.

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Section: Principle Of Oenfmentioning

confidence: 89%

“…[16][17][18][19][20]. LO sweeps past SUT and forms chirp coherent signal in both frequency and time domain.…”

Section: Principle Of Oenfmentioning

confidence: 99%

An optoelectronic equivalent narrowband filter for high resolution optical spectrum analysis

Feng

Dang

et al. 2017

Preprint

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“…A low-speed photodetector is used to measure the amplitude response directly for comparison to the SSB results. Single-sideband modulation was confirmed using a coherent optical spectrum analyzer setup [9]. The modulation frequency was tweaked to be an integer multiple of the MZI free spectral range.…”

Section: Ofc/nfoec 2008mentioning

confidence: 99%

High Resolution Optical Phase Response Measurement Using Single Sideband Modulation

Adams

Madsen

2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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“…The measurement principle is to construct an ultra-narrowband optical filter with the narrow-linewidth output of the tunable laser, which sweeps across the wavelength of interest. Coherent optical spectrum analysis was first proposed based on swept-tuned optical local oscillator and coherent detection [3], based on which the best resolution of 40 fm (5MHz) commercial product has been available. Highresolution optical spectrometry based on stimulated Brillouin scattering (SBS) and a swept-tuned laser was also demonstrated [4], and its 80-fm (20 MHz) high spectral resolution comes from the narrowband Brillouin amplification, which however limits further improving the spectral resolution.…”

Section: Introduction and Measurement Principlementioning

confidence: 99%

“…High-resolution optical spectroscopy [1][2][3][4] has always attracted considerable interests due to its extensive applications including high-accuracy optical sensing [5], diagnostic and monitoring of signals in optical communication systems [6], characterizing and evaluating optical frequency comb sources [7], characterizing narrow linewidth laser sources [8], and etc. The best spectral resolution of the traditional grating-based optical spectrum analyzer (OSA) can only reach a few pm, which is limited by the groove-line densities of the grating and the maximum optical beam diameter.…”

Section: Introduction and Measurement Principlementioning

confidence: 99%

Ultrahigh resolution optical spectrometry based on Brillouin dynamic grating

et al. 2014

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We demonstrate an ultrahigh resolution optical spectrometry based on Brillouin dynamic grating (BDG). Taking advantage of creating a long grating in an optical fiber, an ultra-narrow bandwidth optical filter is realized by operating a BDG in a long single-mode fiber (SMF), and the optical spectrometry is performed by sweeping the center wavelength of the filter through swept-tuned laser. In experiment, a 4-fm (0.5 MHz) spectral resolution is achieved by operating a BDG in a 400-m SMF, and the wavelength coverage can be readily extended to C+L band with a commercial tunable laser.

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Coherent optical spectrum analyzer

Cited by 79 publications

References 3 publications

An optoelectronic equivalent narrowband filter for high resolution optical spectrum analysis

An optoelectronic equivalent narrowband filter for high resolution optical spectrum analysis

High Resolution Optical Phase Response Measurement Using Single Sideband Modulation

Ultrahigh resolution optical spectrometry based on Brillouin dynamic grating

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