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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 9 — May. 5, 2014
  • pp: 11129–11139
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Optical length change measurement via RF frequency shift analysis of incoherent light source based optoelectronic oscillator

Xihua Zou, Ming Li, Wei Pan, Bin Luo, Lianshan Yan, and Liyang Shao  »View Author Affiliations


Optics Express, Vol. 22, Issue 9, pp. 11129-11139 (2014)
http://dx.doi.org/10.1364/OE.22.011129


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Abstract

Radio-frequency (RF) frequency shift of incoherent light source based optoelectronic oscillator (OEO) is employed to measure the optical length change. In the proposed OEO using an incoherent light source, the optical length under test is inserted in the optoelectronic hybrid loop. The frequency shift of RF oscillation modes at the output of the OEO reflects the optical length change, with the change being measured via frequency shift analysis. Two OEO configurations are theoretically designed and experimentally performed, while an amplified spontaneous emission (ASE) source serves as the incoherent light source. A linear relationship between the frequency shift and the optical length change has been confirmed for measurement, and a reconfigurable measurement sensitivity is available by selecting different oscillation modes. Moreover, the use of ASE greatly reduces the complexity and the cost for stabilization control on light source, while the derived results are consistent with that obtained in a laser source based OEO both in the measured optical length changes and the phase noise performance. A sensitivity of −28 KHz/cm, −480 KHz/cm or higher, and a resolution of nano-meter scale are obtained, which can be used to monitor the displacement, the changes in refractive index, temperature.

© 2014 Optical Society of America

1. Introduction

Since optical length change is usually determined by the variation in refractive index, temperature, strain, displacement or distance, it is one of the essential parameters to be measured in the sensing field and other applications. Therefore, a large variety of sensors or systems for optical length change measurement have been designed and implemented, including for instance Mach-Zehnder/Michelson/Sagnac interferometers, fiber gratings, optical rings or micro-rings, and Fabry-Perot cavities [1

1. K. T. V. Grattan and B. T. Meggitt, Optical Fiber Sensors Technology: Devices and Technology (London, UK: Chapman & Hall, 1998).

5

5. H. Z. Tang, W. L. Zhang, Y. J. Rao, Y. Y. Zhu, and Z. N. Wang, “Spectrum-adjustable random lasing in single-mode fiber controlled by a FBG,” Opt. Laser Technol. 57, 100–103 (2014). [CrossRef]

].

Recently, the optoelectronic oscillator (OEO) is regarded as one promising solution for the measurement of optical length change. An OEO is an optoelectronic hybrid oscillating loop consisting of optical and electrical links, where the optical energy is converted into radio-frequency (RF) or microwave oscillation signals. At the very beginning, the OEO is proposed for generating high-frequency microwave signals which are characterized by low phase noise [6

6. X. S. Yao and L. Maleki, “High frequency optical subcarrier generator,” Electron. Lett. 30(18), 1525–1526 (1994). [CrossRef]

,7

7. X. S. Yao and L. Maleki, “Optoelectronic microwave oscillator,” J. Opt. Soc. Am. B 13(8), 1725–1735 (1996). [CrossRef]

]. Then a series of reports regarding enhanced OEOs have been released. In [8

8. W. Zhou and G. Blasche, “Injection-locked dual opto-electronic oscillator with ultra-low phase noise and ultra-low spurious level,” IEEE Trans. Microw. Theory Tech. 53(3), 929–933 (2005). [CrossRef]

10

10. I. Ozdur, M. Akbulut, N. Hoghooghi, D. Mandridis, M. U. Piracha, and P. J. Delfyett, “Optoelectronic loop design with 1000 finesse Fabry-Perot etalon,” Opt. Lett. 35(6), 799–801 (2010). [CrossRef] [PubMed]

], by using the injection locking or an intra-loop Fabry-Perot etalon, the frequency stability of OEOs has been improved. While in a coupled OEO [11

11. A. B. Matsko, D. Eliyahu, and L. Maleki, “Theory of coupled optoelectronic microwave oscillator II: phase noise,” J. Opt. Soc. Am. B 30(12), 3316–3323 (2013). [CrossRef]

], the phase noise of generated microwave signals can be reduced to be extremely low, approaching −160 dBc/Hz at 10 KHz offset. With the help of tunable microwave photonics filters, OEOs having continuously tunable oscillation frequency are designed to enlarge the frequency coverage [12

12. W. Li and J. Yao, “An optically tunable optoelectronic oscillator,” J. Lightwave Technol. 28(18), 2640–2645 (2010). [CrossRef]

14

14. F. Jiang, J. H. Wong, H. Q. Lam, J. Zhou, S. Aditya, P. H. Lim, K. E. K. Lee, P. P. Shum, and X. Zhang, “An optically tunable wideband optoelectronic oscillator based on a bandpass microwave photonic filter,” Opt. Express 21(14), 16381–16389 (2013). [CrossRef] [PubMed]

]. Especially, in [15

15. M. Li, W. Li, and J. Yao, “Tunable optoelectronic oscillator incorporating a high-Q spectrum sliced photonic microwave transversal filter,” IEEE Photon. Technol. Lett. 24(14), 1251–1253 (2012). [CrossRef]

] a sliced broadband light source was employed to generate microwave signals with high spectral purity, while the derived phase noise was lower than −120 dBc/Hz at 10 KHz offset. Frequency-doubling or frequency-quadrupling are also implemented [16

16. M. Shin and P. Kumar, “Optical microwave frequency up-conversion via a frequency-doubling optoelectronic oscillator,” IEEE Photon. Technol. Lett. 19(21), 1726–1728 (2007). [CrossRef]

19

19. X. Liu, W. Pan, X. Zou, D. Zheng, B. Luo, and L. Yan, “Frequency-doubling optoelectronic oscillator using DSB-SC modulation and carrier recovery based on stimulated Brillouin scattering,” IEEE Photon. J. 5(2), 6600606 (2013). [CrossRef]

], with the limit on high-frequency narrow electrical filters relieved. In addition, OEOs have already found applications in new fields. In [20

20. H. Tsuchida and M. Suzuki, “40-Gb/s clock recovery using an injection-locked optoelectronic oscillator,” IEEE Photon. Technol. Lett. 17(1), 211–213 (2005). [CrossRef]

25

25. W. Li, W. T. Wang, W. H. Sun, L. X. Wang, J. G. Liu, and N. H. Zhu, “Generation of flat optical frequency comb using a single polarization modulator and a Brillouin-assisted power equalizer,” IEEE Photon. J. 6(2), 790908 (2014). [CrossRef]

], the optical clock recovery and the generation of optical pulses or optical frequency comb have been realized using the OEO structures. Microwave or optical measurement can be performed as well, such as RF signal channelization [26

26. V. J. Urick, P. S. Devgan, J. D. McKinney, F. Bucholtz, and K. J. Williams, “Channelisation of radio-frequency signals using optoelectronic oscillator,” Electron. Lett. 45(24), 1242–1243 (2009). [CrossRef]

28

28. P. S. Devgan, V. J. Urick, and K. J. Williams, “Detection of low-power signals using a two laser multimode optoelectronic oscillator,” IEEE Photon. Technol. Lett. 24(10), 857–859 (2012).

], optical frequency stability measurement [29

29. I. Ozdur, D. Mandridis, M. U. Piracha, M. Akbulut, N. Hoghooghi, and P. J. Delfyett, “Optical frequency stability measurement using an etalon-based optoelectronic oscillator,” IEEE Photon. Technol. Lett. 23(4), 263–265 (2011). [CrossRef]

], and refractive index measurement [30

30. L. D. Nguyen, K. Nakatani, and B. Journet, “Refractive index measurement by using an optoelectronic oscillator,” IEEE Photon. Technol. Lett. 22(12), 1726–1728 (2010). [CrossRef]

]. After reviewing these new applications of OEOs, it is known that there would be a large space for significant parameters measurement, such as the measurement of optical length change.

2. Measurement principle

Equation (3) reveals a linear relationship under the perturbation condition when the optical length change is regarded as a perturbation. Thus the optical length change can be derived by measuring the frequency shift of the RF signals and the measurement sensitivity can be flexibly adjusted by choosing a customized oscillation mode of the RF signals. Here the optical length change might be induced by one or several parameters, such as temperature, strain, or displacement.

In both OEOs above, the optical length change is monitored via the frequency shift or frequency coding of RF oscillation signals. Firstly, owing to the available high-resolution frequency analysis in electrical domain, high sensing resolution for optical length change would be resulted in a cost-effective way by using the proposed OEOs, compared with the use of optical frequency analysis in the optical domain. The use of frequency shift or frequency coding also makes the measurement immune to the loss variation or the amplitude change in the OEO configurations. Secondly, from Eqs. (3), (6), (7), different oscillation modes can be selected as target for optical length change measurement, such that multiple different sensitivities are available, providing reconfigurable sensing sensitivity for different application requirements. Moreover, in comparison with the use of a laser in a regular OEO, the use of incoherent light source in the measurement system also cuts the cost on the light source, while the sensing sensitivity and the phase noise performance are good enough for measurement applications.

3. Experiments

As we tune the OVDL step by step, it is known from Eq. (3) that all RF oscillation modes will experience frequency shift and each mode has a unique frequency shift slope or sensing sensitivity. For instance, the first oscillation mode around 29 MHz is chosen for measurement demonstration and the results are shown in Fig. 4(a)
Fig. 4 Relationship between the frequency shift and the optical length change for the oscillation modes around (a) 29MHz and (b) 490MHz.
, wherein k=1 according to Eq. (3). The spectrum of the selected mode is plotted in the left inset of Fig. 4(a) when the optical length change is 3 cm, from which the RF frequency is derived as 29.056 MHz. By tuning the OVDL, we can derive a number of RF frequencies that reflect different optical length changes. Consequently, an excellent linear relationship between the frequency shift and the optical length change within the range of 0~10 cm is observed and the sensing sensitivity of is derived as −28 KHz/cm. For more details, in the right inset of Fig. 4(a), a zoom-in view for the range of 0~2 cm is present and the local linear relationship agrees well with the total linear relationship. From the mode spacing close to 30 MHz shown in Fig. 3, a measurement range up to 100 cm can be achieved. To keep an excellent linear relationship, the perturbation condition is fulfilled in the measurement range of 10 cm.

Then we move to another oscillation mode. As k=17, the corresponding spectrum of the selected mode at 490.6411 MHz is present in the inset of Fig. 4(b) while the optical length change is set as 2.8 cm. After obtaining a number of such RF frequencies, a linear relationship between the frequency shift and the optical length change is achieved as well and plotted in Fig. 4(b). Here the sensitivity is increases to −480 KHz/cm. It is noted that, although linear relationships are observed for the two selected modes, the sensitivity of −480 KHz/cm at the mode around 490 MHz is about 17 times greater than the one of −28 KHz/cm at the mode around 29 MHz. This indicates that a reconfigurable sensitivity will be available for many measurement/sensing scenarios by setting different oscillation modes, which has been already predicted in Eq. (3).

For a purpose of comparison, the ASE in the Fig. 2 is replaced by a tunable single-frequency laser source. At the output of the OEO, the RF oscillation signals are tested and shown in Fig. 5
Fig. 5 Spectrum of oscillation signals measured in the case of using a laser source.
. The derived frequency shifts versus the optical length changes are then illustrated in Fig. 6
Fig. 6 Relationship between the frequency shift and the optical length change with the use of a laser source.
and a zoom-in view is shown in the inset, indicating a total measurement range of 0~10 cm and a local range of 0~2 cm. It is clear that a linear relationship with a slope of −28 KHz/cm is obtained, which corresponds to a sensing sensitivity of −28 KHz/cm. Thus, compared with the use of a laser source, the use of an ASE is also able to realize the same measurement performance and an identical measurement sensitivity.

Also, the phase noise spectra of the two cases using ASE and using laser source are measured for the purpose of comparison. A similar reduction trend in the two phase noise spectra is observed for the same oscillation mode. At the 10-KHz and the 100-KHz offsets, the phase noise obtained using ASE is 5 dB higher than that achieved using laser source. Such a small phase noise difference between two cases exerts little influence on the optical length change measurement using frequency shift analysis. In addition, it is noted that the measured phase noise performances in the two cases are not as good as those in the microwave signal generation approaches [8

8. W. Zhou and G. Blasche, “Injection-locked dual opto-electronic oscillator with ultra-low phase noise and ultra-low spurious level,” IEEE Trans. Microw. Theory Tech. 53(3), 929–933 (2005). [CrossRef]

14

14. F. Jiang, J. H. Wong, H. Q. Lam, J. Zhou, S. Aditya, P. H. Lim, K. E. K. Lee, P. P. Shum, and X. Zhang, “An optically tunable wideband optoelectronic oscillator based on a bandpass microwave photonic filter,” Opt. Express 21(14), 16381–16389 (2013). [CrossRef] [PubMed]

,16

16. M. Shin and P. Kumar, “Optical microwave frequency up-conversion via a frequency-doubling optoelectronic oscillator,” IEEE Photon. Technol. Lett. 19(21), 1726–1728 (2007). [CrossRef]

18

18. D. Zhu, S. Pan, and D. Ben, “Tunable frequency-quadrupling dual-loop optoelectronic oscillator,” IEEE Photon. Technol. Lett. 24(3), 194–196 (2012). [CrossRef]

] which were designed for high-spectral-purity microwave signal generation.

Next, the experimental setups for the second OEO shown in Fig. 1(b) are illustrated in Fig. 7
Fig. 7 Experimental setups for the second OEO shown in Fig. 1(b) with optical length change in (a) L1 and (b) L2. (ASE, amplified spontaneous emission; MZM, Mach-Zehnder modulator; EDFA, Er-doped fiber amplifier; OVDL, optical variable delay line; PD, photo-detector; C, electrical coupler; Am: electrical amplifier)
. From Eqs. (4) and (5), the introduction of the fiber loop into the optoelectronic hybrid loop could enlarge the mode spacing of the RF oscillation signals. Subsequently, a larger measurement range will be offered. The spectrum of the RF signals is recorded and illustrated in Fig. 8
Fig. 8 Spectrum of the oscillation signals obtained from the experimental setup in Fig. 7(a).
, where an increased mode spacing of 84.2 MHz is formed. Meanwhile, according to Eq. (6), the linear relationship between the frequency shift and the optical length change still holds under the perturbation condition.

As we adjust the OVDL to emulate the optical length change in L1, the first oscillation mode around 67 MHz is selected for demonstration and the corresponding spectrum is shown in Fig. 9
Fig. 9 Relationship between the frequency shift and the optical length change in L1.
and its inset. The distribution of the frequency shift versus the optical length change is then given and a linear relationship with a sensitivity of −13 KHz/cm is achieved. Meanwhile, the corresponding phase noise spectrum is also measured, and a value of −80 dBc/Hz is achieved at 10 KHz offset. This phase noise is much close to that achieved using laser source, indicating that excellent phase noise performance for measurement applications can be obtained in the second OEO shown in Fig. 1(b) as well.

Further, the OVDL is moved into the fiber loop to emulate the optical length change in L2. Likewise, when the oscillation mode around 57 MHz is chosen, the obtained frequency shifts are illustrated in Fig. 10
Fig. 10 Relationship between the frequency shift and the optical length change in L2.
and a sensitivity of −14 KHz/cm is achieved, showing a linear relationship in line with the prediction of Eq. (7).

Up to now, using the proposed OEOs, the optical length change measurement has been experimentally performed via the frequency shift analysis of the RF signals, owing to the linear relationship between the optical length change and the frequency shift. Moreover, the use of an incoherent source yields identical measurement results and sensing sensitivities, and similar phase noise performances, compared with that achieved by using a laser source. For instance, an identical measurement sensitivity of −28 KHz/cm was derived for OEOs using ASE and laser source. Similar phase noise spectra were observed, with only a 5-dB degradation to the phase noises at the 10-KHz and the 100-KHz offset frequencies in the ASE-based OEO. The phase noise performance also can be verified from the results in [31

31. X. Liu, W. Pan, X. Zou, B. Luo, L. Yan, and B. Lu, “A reconfigurable optoelectronic oscillator based on cascaded coherence-controllable recirculating delay lines,” Opt. Express 20(12), 13296–13301 (2012). [CrossRef] [PubMed]

] where an OEO configuration using ASE and fiber loops was implemented. Therefore, the use of an ASE not only provides similar measurement specificaitons, but also relieves the complexity and the cost for stabilization control of optical source for measurement applications.

Additionally, the measurement experiments would suffer from the environmental instabilities, such as temperature and vibration. As the experiments were performed under a relative stable room temperature, the selected oscillation mode experiences little frequency shift as the loop length is fixed. This operation stability can be indirectly confirmed from the linear variation between the frequency shift and the optical length change in Fig. 4.

4. Discussions

In addition, in our experiments, a spectrum analyzer (R&S FSV) with a frequency resolution of 0.01 Hz is used. Therefore, in theory, a resolution to displacement measurement is estimated to be 3.57 nm in the first OEO configuration, 7.69 and 7.14 nm in the second one. If a spectrum analyzer with a finer resolution bandwidth (RBW) is used, higher measurement resolutions can be achieved.

5. Conclusion

Incoherent light source based OEOs were proposed for the optical length change measurement. Two configurations for the OEOs were established, one with a single hybrid loop and the other having a fiber loop and a hybrid loop. In both OEOs, a linear relationship between the frequency shift and the optical length change was theoretically predicted. By analyzing the frequency shift of the selected oscillation mode, the optical length change was estimated. In the first OEO without fiber loop, the predicted linear relationship was experimentally confirmed via the frequency shift analysis of two oscillation modes at 490 and 29 MHz. Measurement sensitivities of −28 and −480 KHz/cm were observed respectively, indicating a reconfigurable sensitivity. For the second OEO with a fiber loop, linear relationships with a sensitivity of −13 and −14 KHz/cm were obtained. Compared with the use of a laser source, the use of ASE source enabled identical linear measurement relationship, sensing sensitivity, and similar phase noise performance for measurement applications. More importantly, the proposed measurement approach using incoherent source based OEOs has the advantages of low cost, high resolution, reconfigurable sensitivity, and immunity to power variation in electrical and optical links.

Acknowledgment

The work was supported in part by the National Natural Science Foundation of China (61378008), the 973 Project (2012CB315704), the Research Fund for the Doctoral Program of Higher Education of China (20110184130003), and the Program for New Century Excellent Talents in University of China (NCET-12-0940).

References and links

1.

K. T. V. Grattan and B. T. Meggitt, Optical Fiber Sensors Technology: Devices and Technology (London, UK: Chapman & Hall, 1998).

2.

B. Culshaw and A. Kersey, “Fiber-optic sensing: a historical perspective,” J. Lightwave Technol. 26(9), 1064–1078 (2008). [CrossRef]

3.

C. Wang and J. Yao, “Ultrafast and ultrahigh-resolution interrogation of a fiber Bragg grating sensor based on interferometric temporal spectroscopy,” J. Lightwave Technol. 29(19), 2927–2933 (2011). [CrossRef]

4.

X. Zou, M. Li, W. Pan, L. Yan, J. Azaña, and J. Yao, “All-fiber optical filter with an ultranarrow and rectangular spectral response,” Opt. Lett. 38(16), 3096–3098 (2013). [CrossRef] [PubMed]

5.

H. Z. Tang, W. L. Zhang, Y. J. Rao, Y. Y. Zhu, and Z. N. Wang, “Spectrum-adjustable random lasing in single-mode fiber controlled by a FBG,” Opt. Laser Technol. 57, 100–103 (2014). [CrossRef]

6.

X. S. Yao and L. Maleki, “High frequency optical subcarrier generator,” Electron. Lett. 30(18), 1525–1526 (1994). [CrossRef]

7.

X. S. Yao and L. Maleki, “Optoelectronic microwave oscillator,” J. Opt. Soc. Am. B 13(8), 1725–1735 (1996). [CrossRef]

8.

W. Zhou and G. Blasche, “Injection-locked dual opto-electronic oscillator with ultra-low phase noise and ultra-low spurious level,” IEEE Trans. Microw. Theory Tech. 53(3), 929–933 (2005). [CrossRef]

9.

J. M. Kim and D. Cho, “Optoelectronic oscillator stabilized to an intra-loop Fabry-Perot cavity by a dual servo system,” Opt. Express 18(14), 14905–14912 (2010). [CrossRef] [PubMed]

10.

I. Ozdur, M. Akbulut, N. Hoghooghi, D. Mandridis, M. U. Piracha, and P. J. Delfyett, “Optoelectronic loop design with 1000 finesse Fabry-Perot etalon,” Opt. Lett. 35(6), 799–801 (2010). [CrossRef] [PubMed]

11.

A. B. Matsko, D. Eliyahu, and L. Maleki, “Theory of coupled optoelectronic microwave oscillator II: phase noise,” J. Opt. Soc. Am. B 30(12), 3316–3323 (2013). [CrossRef]

12.

W. Li and J. Yao, “An optically tunable optoelectronic oscillator,” J. Lightwave Technol. 28(18), 2640–2645 (2010). [CrossRef]

13.

W. Li and J. Yao, “A wideband frequency tunable optoelectronic oscillator incorporating a tunable microwave photonic filter based on phase-modulation to intensity-modulation conversion using a phase-shifted fiber Bragg grating,” IEEE Trans. Microw. Theory Tech. 60(6), 1735–1742 (2012). [CrossRef]

14.

F. Jiang, J. H. Wong, H. Q. Lam, J. Zhou, S. Aditya, P. H. Lim, K. E. K. Lee, P. P. Shum, and X. Zhang, “An optically tunable wideband optoelectronic oscillator based on a bandpass microwave photonic filter,” Opt. Express 21(14), 16381–16389 (2013). [CrossRef] [PubMed]

15.

M. Li, W. Li, and J. Yao, “Tunable optoelectronic oscillator incorporating a high-Q spectrum sliced photonic microwave transversal filter,” IEEE Photon. Technol. Lett. 24(14), 1251–1253 (2012). [CrossRef]

16.

M. Shin and P. Kumar, “Optical microwave frequency up-conversion via a frequency-doubling optoelectronic oscillator,” IEEE Photon. Technol. Lett. 19(21), 1726–1728 (2007). [CrossRef]

17.

L. X. Wang, N. H. Zhu, W. Li, and J. G. Liu, “A frequency-doubling optoelectronic oscillator based on a dual-parallel Mach–Zehnder modulator and a chirped fiber Bragg grating,” IEEE Photon. Technol. Lett. 23(22), 1688–1690 (2011). [CrossRef]

18.

D. Zhu, S. Pan, and D. Ben, “Tunable frequency-quadrupling dual-loop optoelectronic oscillator,” IEEE Photon. Technol. Lett. 24(3), 194–196 (2012). [CrossRef]

19.

X. Liu, W. Pan, X. Zou, D. Zheng, B. Luo, and L. Yan, “Frequency-doubling optoelectronic oscillator using DSB-SC modulation and carrier recovery based on stimulated Brillouin scattering,” IEEE Photon. J. 5(2), 6600606 (2013). [CrossRef]

20.

H. Tsuchida and M. Suzuki, “40-Gb/s clock recovery using an injection-locked optoelectronic oscillator,” IEEE Photon. Technol. Lett. 17(1), 211–213 (2005). [CrossRef]

21.

S. L. Pan and J. P. Yao, “Optical clock recovery using a polarization-modulator-based frequency-doubling optoelectronic oscillator,” J. Lightwave Technol. 27(16), 3531–3539 (2009). [CrossRef]

22.

Y.-C. Chi and G.-R. Lin, “A self-started laser diode pulsation based synthesizer-free optical return-to-zero on–off-keying data generator,” IEEE Trans. Microw. Theory Tech. 58(8), 2292–2298 (2010). [CrossRef]

23.

A. Sherman and M. Horowitz, “Ultralow-repetition-rate pulses with ultralow jitter generation by passive mode-locking of an optoelectronic oscillator,” J. Opt. Soc. Am. B 30(11), 2980–2983 (2013). [CrossRef]

24.

X. Liu, W. Pan, X. Zou, L. Yan, B. Luo, and B. Lu, “Investigation on tunable modulation index in the polarization-modulator-based optoelectronic oscillator,” IEEE J. Quantum Electron. 50(2), 68–73 (2014). [CrossRef]

25.

W. Li, W. T. Wang, W. H. Sun, L. X. Wang, J. G. Liu, and N. H. Zhu, “Generation of flat optical frequency comb using a single polarization modulator and a Brillouin-assisted power equalizer,” IEEE Photon. J. 6(2), 790908 (2014). [CrossRef]

26.

V. J. Urick, P. S. Devgan, J. D. McKinney, F. Bucholtz, and K. J. Williams, “Channelisation of radio-frequency signals using optoelectronic oscillator,” Electron. Lett. 45(24), 1242–1243 (2009). [CrossRef]

27.

X. Zou, W. Li, W. Pan, L. Yan, and J. Yao, “Photonic-assisted microwave channelizer with improved channel characteristics based on spectrum-controlled stimulated Brillouin scattering,” IEEE Trans. Microw. Theory Tech. 61(9), 3470–3478 (2013). [CrossRef]

28.

P. S. Devgan, V. J. Urick, and K. J. Williams, “Detection of low-power signals using a two laser multimode optoelectronic oscillator,” IEEE Photon. Technol. Lett. 24(10), 857–859 (2012).

29.

I. Ozdur, D. Mandridis, M. U. Piracha, M. Akbulut, N. Hoghooghi, and P. J. Delfyett, “Optical frequency stability measurement using an etalon-based optoelectronic oscillator,” IEEE Photon. Technol. Lett. 23(4), 263–265 (2011). [CrossRef]

30.

L. D. Nguyen, K. Nakatani, and B. Journet, “Refractive index measurement by using an optoelectronic oscillator,” IEEE Photon. Technol. Lett. 22(12), 1726–1728 (2010). [CrossRef]

31.

X. Liu, W. Pan, X. Zou, B. Luo, L. Yan, and B. Lu, “A reconfigurable optoelectronic oscillator based on cascaded coherence-controllable recirculating delay lines,” Opt. Express 20(12), 13296–13301 (2012). [CrossRef] [PubMed]

OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.0250) Optical devices : Optoelectronics
(230.4910) Optical devices : Oscillators
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(060.5625) Fiber optics and optical communications : Radio frequency photonics

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: February 25, 2014
Revised Manuscript: April 2, 2014
Manuscript Accepted: April 2, 2014
Published: May 1, 2014

Citation
Xihua Zou, Ming Li, Wei Pan, Bin Luo, Lianshan Yan, and Liyang Shao, "Optical length change measurement via RF frequency shift analysis of incoherent light source based optoelectronic oscillator," Opt. Express 22, 11129-11139 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-9-11129


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References

  1. K. T. V. Grattan and B. T. Meggitt, Optical Fiber Sensors Technology: Devices and Technology (London, UK: Chapman & Hall, 1998).
  2. B. Culshaw, A. Kersey, “Fiber-optic sensing: a historical perspective,” J. Lightwave Technol. 26(9), 1064–1078 (2008). [CrossRef]
  3. C. Wang, J. Yao, “Ultrafast and ultrahigh-resolution interrogation of a fiber Bragg grating sensor based on interferometric temporal spectroscopy,” J. Lightwave Technol. 29(19), 2927–2933 (2011). [CrossRef]
  4. X. Zou, M. Li, W. Pan, L. Yan, J. Azaña, J. Yao, “All-fiber optical filter with an ultranarrow and rectangular spectral response,” Opt. Lett. 38(16), 3096–3098 (2013). [CrossRef] [PubMed]
  5. H. Z. Tang, W. L. Zhang, Y. J. Rao, Y. Y. Zhu, Z. N. Wang, “Spectrum-adjustable random lasing in single-mode fiber controlled by a FBG,” Opt. Laser Technol. 57, 100–103 (2014). [CrossRef]
  6. X. S. Yao, L. Maleki, “High frequency optical subcarrier generator,” Electron. Lett. 30(18), 1525–1526 (1994). [CrossRef]
  7. X. S. Yao, L. Maleki, “Optoelectronic microwave oscillator,” J. Opt. Soc. Am. B 13(8), 1725–1735 (1996). [CrossRef]
  8. W. Zhou, G. Blasche, “Injection-locked dual opto-electronic oscillator with ultra-low phase noise and ultra-low spurious level,” IEEE Trans. Microw. Theory Tech. 53(3), 929–933 (2005). [CrossRef]
  9. J. M. Kim, D. Cho, “Optoelectronic oscillator stabilized to an intra-loop Fabry-Perot cavity by a dual servo system,” Opt. Express 18(14), 14905–14912 (2010). [CrossRef] [PubMed]
  10. I. Ozdur, M. Akbulut, N. Hoghooghi, D. Mandridis, M. U. Piracha, P. J. Delfyett, “Optoelectronic loop design with 1000 finesse Fabry-Perot etalon,” Opt. Lett. 35(6), 799–801 (2010). [CrossRef] [PubMed]
  11. A. B. Matsko, D. Eliyahu, L. Maleki, “Theory of coupled optoelectronic microwave oscillator II: phase noise,” J. Opt. Soc. Am. B 30(12), 3316–3323 (2013). [CrossRef]
  12. W. Li, J. Yao, “An optically tunable optoelectronic oscillator,” J. Lightwave Technol. 28(18), 2640–2645 (2010). [CrossRef]
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