Abstract
In this paper, a complete system analysis of photonic local carrier generation technique has been investigated. The generated carrier is potentially suitable to replace the existing microwave/RF Local Carrier (LC) used in commercial Low Noise Blocks (LNBs) for the Phased Array (PA) receiver system. The optical LC generated from heterodyning of two commercialized lasers is being stabilized with an Optical Frequency Lock Loop (OFLL). This approach resulted in a generated carrier at the Ku-band (10.7GHz to 12.75GHz) signal received from a PA receiver. Various loop parameters of the OFLL have been investigated to comply with the requirements of the commercial LNBs The proposed OFLL shows a 2400 fold improvement in the frequency stability at 1000s averaging time compared to its free running condition. It is also demonstrated that with an optimized loop gain of 30dB, the loop response time of the proposed OFLL becomes 11μs.
Highlights
Stabilization of laser frequency differences is essential in many modern experimental schemes
The main difference among the various frequency locking schemes which have been developed in the last decade, is the method used to generate and process the error signal employed for locking the slave laser [10]
The long term frequency stability of the presented work shows the superior performance of Allan deviation of 1×10-10 for an averaging time of 103s compared to Optical Phase Lock Loop (OPLL) setups involving integrated Phase-Frequency Detectors (PFD) [30]
Summary
Stabilization of laser frequency differences is essential in many modern experimental schemes. When the OPLL is designed to ensure only the stabilization of the frequency drift and not the consistency of the phase, it is called Optical Frequency Locked Loop (OFLL). The voltage is compared to a reference voltage, which sets the beat frequency [12] This approach is limited to the maximum operating frequency of the commercial FVC and can be improved by using a hybrid analog-digital locking scheme using high performance FVCs [13]. Generating the error signal from the amplitude response of an RF filter to realize a sensitive analog FVC is proposed [8, 15] An alternative of these modulation-free error conversion techniques is the use of electrical filters [16] or frequency multipliers [17]. A simple OFLL technique based on the concept presented in [11] is proposed in this paper and its performance is improved with the use of a variable delay line in the frequency discriminator to facilitate beat frequency tuning
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