NDLI: Stable 100 GHz pulses generated by injection locking of multiple lasers to an optical frequency comb

Content Provider	IEEE Xplore Digital Library
Author	Wu, D.S. Richardson, D.J. Slavik, R.
Copyright Year	2013
Description	Author affiliation: Optoelectron. Res. Centre, Univ. of Southampton, Southampton, UK (Wu, D.S.; Richardson, D.J.; Slavik, R.)
Abstract	Summary form only given. Optical frequency combs (OFCs) can generate a wide bandwidth of regularly spaced modes with high frequency stability. Besides frequency and time metrology, OFCs can also have applications in arbitrary waveform generation and telecommunications by manipulating individual comb modes. We have previously demonstrated using optical injection locking to selectively amplify individual comb modes which are closely spaced (250 MHz) [1]. Over 50 dB of gain was achieved with low phase noise associated with the locking process [2]. The injection locking process maintains the coherence properties of the master laser and therefore by combining multiple lasers locked to different frequencies of a common OFC, pulses can be generated.In the work presented here, we have locked three semiconductor lasers 100 GHz apart to a 250 MHz spaced OFC using the technique presented in [1]. The lasers were subsequently combined using an arrayed waveguide grating. The relative phases of the signals from each laser prior to combination were controlled using piezoelectric fibre stretchers which were locked using low-bandwidth feedback loops (<; 10 Hz). The optical spectrum of the combined signal is shown in Fig. 1a. The weak side-modes are due to the injection locking process and their powers were at least -44 dB below that of the main laser modes; they can be further suppressed by reducing the injected power. 100 GHz repetition rate pulses were observed using an optical sampling oscilloscope as shown in Fig. 1b. A root mean square (rms) timing jitter of 193 ± 6 fs was measured for 64,000 sample traces (measured over 6.4 ms). The rms jitter for 20 combined traces (1,280,000 samples), taken over 3 minutes, only increased to 223 ± 6 fs. This increase in jitter can be accounted for by the performance of the feedback system used to control the relative phase of the lasers, which has yet to be fully optimised. This technique can also be used to generate higher repetition rate signals. One of the key advantages of this technique is that the timing jitter scales down with increasing repetition rate since the phase variance associated with the injection locking process is independent of the spectral spacing between the locked lasers.We plan to increase the number of lasers locked to the same OFC. By controlling both the amplitude and phase of each laser we will be able to generate shorter pulses. We will also be able to manipulate the shape of the pulses via line-by-line pulse shaping [3]. This will allow us to generate various shaped waveforms such as square-like and triangular-like pulses.
Sponsorship	Eur. Phys. Soc.
Starting Page	1
Ending Page	1
File Size	342993
Page Count	1
File Format	PDF
e-ISBN	9781479905942
DOI	10.1109/CLEOE-IQEC.2013.6801272
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-12
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fibers Optical pulse shaping Injection-locked oscillators Optical feedback Optical noise Semiconductor laser arrays
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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