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/usr/share/dia/sheets/Optics.sheet is in dia-shapes 0.6.0-1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<sheet xmlns="http://www.lysator.liu.se/~alla/dia/dia-sheet-ns">
	
	
	
	

	<name>Optics</name>
	<description>Optical Fibre Systems</description>
	<contents>
		
		<object name="Optics - Circulator">
			<description>Circulator</description></object>
		
		<object name="Optics - Polarisation Control">
			<description>Polarisation Controller</description></object>

		<object name="Optics - Polarisation Control (vertical)">
			<description>Polarisation Controller</description></object>
		
		<object name="Optics - Coupler">
			<description>Directional Coupler</description></object>
		
		<object name="Optics - Coupler (vertical)">
			<description>Directional Coupler</description></object>
		
		<object name="Optics - Tuneable Coupler">
			<description>Tuneable Coupler</description></object>
		
		<object name="Optics - DFB Laser">
			<description>DFB Laser</description></object>

			<object name="Optics - DFB Laser (vertical)">
			<description>DFB Laser</description></object>
		
		<object name="Optics - Fibre">
			<description>Long Fibre</description></object>
		
		<object name="Optics - Fibre (vertical)">
			<description>Long Fibre</description></object>

		<object name="Optics - Detector">
			<description>Detector</description></object>
		
		<object name="Optics - Detector (vertical)">
			<description>Detector</description></object>
		
		<object name="Optics - Scope">
			<description>Osilloscope</description></object>
		
		<object name="Optics - Spectrum">
			<description>Spectrum Analyser</description></object>
		
		<object name="Optics - Isolator">
			<description>Optical Isolator</description></object>
		
		<object name="Optics - Isolator (vertical)">
			<description>Optical Isolator</description></object>

		<object name="Optics - EDFA">
			<description>EDFA</description></object>

		<object name="Optics - EDFA (vertical)">
			<description>EDFA</description></object>

		<object name="Optics - Variable Attenuator">
			<description>Variable Attenuator</description></object>
			
		<object name="Optics - MZ Modulator">
			<description>MZ Modulator</description></object>

		<object name="Optics - MZ Modulator (vertical)">
			<description>MZ Modulator</description></object>

		<object name="Optics - Phase Modulator">
			<description>Phase Modulator</description></object>
		<object name="Optics - Phase Modulator (vertical)">
			<description>Phase Modulator</description></object>
			
			<object name="Optics - Sine Wave">
			<description>Sine Wave Source</description></object>
		
		<object name="Optics - Square Wave">
			<description>Square Wave Source</description></object>
		
		<object name="Optics - LPG">
			<description>Long Period Grating</description></object>

		<object name="Optics - LPG (vertical)">
			<description>Long Period Grating</description></object>

			<object name="Optics - Beam">
			<description>Light Beam</description></object>

		<object name="Optics - Wave">
			<description>Wave</description></object>
</contents></sheet>