| | 1. Scope The specification covers basic requirements for the structure and optical performances of BH-4001.
 2. Structure
 Table 1
 
	
		3. Performances
			| Item | Specification |  
			| Unit | Min. | Typ. | Max. |  
			| Optical Fiber | Core Material | - | Polymethyl-Methacrylate Resin |  
			| Cladding Material | - | Fluorinated Polymer |  
			| Core Refractive Index | - | 1.49 |  
			| Refractive Index Profile | - | Step Index |  
			| Numerical Aperture | - | 0.58 |  
			| Core Diameter | um | 920 | 980 | 1,040 |  
			| Cladding Diameter | um | 940 | 1,000 | 1,060 |  
			| Jacket | Material | - | Crosslinked Polyethylene |  
			| Color | - | Black |  
			| Diameter | Mm | 2.13 | 2.18 | 2.23 |  
			| Approximate Weight | g/m | 4 |  
			| Indication on the Product | - | None |  Table 2
 
	
		All test are carried out under temperature of 25℃ unless otherwise specified
			| Item | Acceptance Criterion and/or
 [Test Condition]
 | Specification |  
			| Unit | Min. | Typ. | Max. |  
			| Maximum Rating
 | Storage Temperature
 | No Physical Deterioration [in a Dry Atmosphere]
 | ℃ | -55 | - | +105 |  
			| Operation Temperature
 | No Deterioration In Optical Properties*
 [in a Dry Atmosphere]
 | ℃ | -55 | - | +105 |  
			| No Deterioration in Optical Properties**
 [under 95%RH condition]
 | ℃ | - | - | +85 |  
			| Optical Properties
 | Transmission Loss [650nm Collimated Light]
 | [25℃ 50%RH] | dB/km | - | - | 200 |  
			| [Operation Temperature] | dB/km | - | - | 250 |  
			| Mechanical Characteristics | Minimum Bend Radius | Loss Increment ≦0.5dB [A Quarter Bend]
 | mm | 15 | - | - |  
			| Repeated Bending Endurance | Loss Increment≦1dB [in Conformity to the
 JIS C 6861]***
 | Times | 1,000 | - | - |  
			| Tensile Strength | Tensile Force at 5% Elongation; [in Conformity to the JIS C 6861] | N | 70 | - | - |  
			| Twisting Endurance | Loss Increment≦1dB [Sample Length : 1m
 Tensile Force : 4.9N]
 | Times | 5 | - | - |  
			| Impact Endurance | Loss Increment≦1dB [in Conformity to the
 JIS C 6861]
 | Nm | 0.4 | - | - |  *      Attenuation change shall be within +/- 10% after 1,000 hours.
 **    Attenuation change shall be within +/- 10% after 1,000 hours, except that due to absorbed water.
 ***  Bend Angle +/-90。,Bend Radius 15mm, Tension 500g.
 
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