 This review study attempts to summarize available energy storage systems in order to accelerate the adoption of renewable energy. Inefficient energy storage systems have been shown to function as a deterrent to the implementation of sustainable development. It is therefore critical to conduct a thorough examination of existing and soon-to-be-developed energy storage technologies. Various scholarly publications in the fields of energy storage systems and renewable energy have been reviewed and summarized. Data and themes have been further highlighted with the use of appropriate figures and tables. Case studies and examples of major projects have also been researched to gain a better understanding of the energy storage technologies evaluated. An insightful analysis of present energy storage technologies and other possible innovations have been discovered with the use of suitable literature review and illustrations. This report also emphasizes the critical necessity for an efficient storage system if renewable energy is to be widely adopted. 

/pdf/development-and-future-scope-of-renewable-energy-and-energy-50pas628.pdf

Development and Future Scope of Renewable Energy and Energy Storage Systems

The narrow linewidth laser which can operate reliably in space environment has important application value. This paper introduces the prototype of a miniaturized narrow linewidth laser for space application based on a self-developed high finesse optical reference cavity. The prototype performs beat frequency comparison measurement with another narrow linewidth laser system in the laboratory. The fractional frequency instability of a single system is 1.6 × 10 - 15 @1s achieved preliminarily, and the linewidth is 0.86 Hz.

A compact sub-hertz linewidth Fabry Perot cavity frequency stabilized laser for space application

Ultra-stable lasers at optical communication wavelengths have important applications in developing optical frequency transfer via optical fibers. We report the recent development of a 1550 nm stable laser system built at National Time Service Center and its preliminary application in optical frequency transfer via laboratory fibers.
In the experiment, the conventional Pound-Drever-Hall(PDH) frequency stabilization technology is implemented to achieve the ultra-stable laser at the wavelength of 1550 nm. The output of a single laser source is split and locked onto the resonant frequency of two independent reference cavities, of 344000 and 296000 respectively. The frequency of the laser source is actively stabilized to the first reference cavity by piezo and external frequency shifters simultaneously and the total control bandwidth is measured to be 50 kHz. Then the laser frequency is shifted and stabilized to the second reference cavity by an acousto-optical modulator. A 5 m long single-mode fiber is used to bring the first laser beam to the second reference cavity which unfortunately induces unexpected phase noise by environmental distortions. The laser linewidth broadened is determined to be 0.27 Hz by the beat note measurement between the input and output beams of the fiber. To evaluate the frequency stability of the laser, the frequency control signal within the control bandwidth of the second stable laser system is analyzed by a spectrum analyzer and a frequency counter. The control signal shows a Lorentz linewidth of 2.7 Hz and a frequency stability of 2.510-14/s, corresponding to a single laser linewidth of 1.9 Hz with a frequency stability of 1.710-14/s if the two stable lasers have similar frequency stability.
Applying this ultra-stable laser system as the laser source for the fiber-based optical frequency transfer, a short-term frequency transfer stability of 7.510-17/s is demonstrated through a 50 km-long fiber spool, while a frequency transfer stability of 2.410-16/s is achieved by a similar setup except that the laser source is a kHz-level linewidth laser. In the experiment an Agilent 53232 A frequency counter is applied to record the beat note signal in the auto mode.
In the end, we discuss the possible improvements of the stable laser system, including the miniaturization of the optical setup, optimization of the control bandwidth and shortening of the response time of control loop.

Development and application of communication band narrow linewidth lasers

Cascaded optical frequency transfer over 500-km fiber link using regenerative amplifier

We demonstrate a coherent phase transfer via a 224 km cascaded fiber link comprising two 112 km links stabilized by two phase-locking loops, respectively. The optical signal is regenerated employing heterodyne optical phase locking (HOPL) after the first 112 km transfer. With a gain of more than 50 dB, the HOPL is capable of tracking the frequency of the incoming carrier with a fluctuation of 0.48 mHz and preserving the instability of the incoming laser to 6×10−20 at 1000 s. The phase noise cancellation of each span is investigated, and the out-loop transfer instability of the 224 km link reaches 7.7×10−19 at 10,000 s. The relation between the transfer instability of each span and that of the whole link is also deduced in the paper, in agreement with experimental results of the 224 km link.

Coherent phase transfer via fiber using heterodyne optical phase locking as optical amplification.

Optical clocks are considered as promising candidates for redefining the second in the International System of Units. Compared with microwave clocks, optical clocks are powerful tools for the fundamental research such as the constancy of the fundamental constants, the validity of Einstein’s theory of general relativity, and the predictions of quantum electrodynamics. Recently two research groups have demonstrated the optical clocks with an unprecedented precision level of 10-18, which is two orders better than the present primary frequency standard. Using two Sr optical clocks and three Cs fountain clocks, SYRTE group has demonstrated the definition of second with optical clocks.#br#For redefining the second with optical clocks in the future, the optical clocks from the remote laboratories should have a high precision and the frequency of the optical clocks need to be transferred over a long distance, with extremely high precision. Unfortunately the conventional means of frequency transfer such as two-way satellite time and frequency transfer can reach a 10-16 level in one day which is far below the requirement for an optical clocks. Various methods have been developed to transfer optical frequency signal via optical fibers. Especially a research group from Germany has achieved a frequency transfer stability of 10-19 level in hundreds of seconds with a fiber length of 1840 km.#br#We demonstrate the recent development of optical frequency transfer over a 70-km fiber spool at National Time Service Center. The measurement shows that the compensation for the fiber noise is close to the limitation induced by the fiber delay for the Fourier frequency from 1 Hz to 250 Hz. The transfer stability (Allan deviation) of the fiber link is 1.2×10-15 in 1 s averaging time, and 1.4×10-18 in 10000 s. A preliminary test of the optical frequency transfer over a 100-km spooled fiber is achieved with a stability of roughly one order worse than the 71 km result, 5×10-15 in 1 s.#br#We demonstrate a new scheme of remote compensation for optical frequency transfer via fibers against conventional local compensation method. This new scheme has the advantage of great simplification of the local site, which can find applications in massive extension of star network. The key feature is that we transfer the mixture of the round-trip signal and local reference to the remote user’s end via an auxiliary fiber. At remote site, the fiber noise is measured and compensated by AOM2 accordingly.#br#Transfer stabilities of 13×10-15 in 1 s averaging time and 4.8×10-18 in 10000 s are achieved with the remote fiber noise compensation via a 25 km fiber spool. The demonstrated transfer stability is comparable to that obtained by the local fiber noise compensation method.#br#The future star fiber network of optical frequency transfer can benefit from this method, because the simpler local setup is required and even can be shared in the central site for multitudinous remote users.

Study of optical frequency transfer via fiber

Self-reliance and independently developed high-finesse spherical ultrastable optical reference cavity

This works demonstrates an improved local two-way optical phase comparison method without the requirement of synchronization. Based on this scheme, we implement a real-time frequency comparison over a bi-directional 50-km fiber spool. The achieved relative frequency stability is 1.2E-16 at 1 s integration time and reaches 1.3E-21 at 40,000 s.

Two-way optical phase comparison at 10 −21 level

We have investigated the vibrational sensitivity of a horizontal-mounted spherical reference cavity, which can be applied to develop an ultra-stable laser. Effects of different magnitudes of height and area as well as acceleration of the cavity support points on the length variation of the cavity are studied. When the cavity support points are totally constrained, the vibration sensitivity can be reduced to below 3.0 x 10(-10)/g. After performing extensive numerical simulations, we can find the optimal support position. According to the obtained results we present the mounting scheme of the spherical cavity. Taking into consideration the machining errors, near-horizontal mounting, and unsymmetrical mounting of the cavity, we can describe quantitatively the length variation of the cavity caused by these three factors. We also discuss the contribution of the second order effect to the length variation of the cavity.

Study of a spherical vibration-insensitive optical reference cavity

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