Benchmark has designed a new Optical Fibre System laboratory configuration - OFS System A. Launched in April, 2003, the new configuration extends the OFS Series II & III systems for training students on different devices used in fibre optic communication systems. The OFS System A facilitates the training of students in the workings of optic fibres, LEDs, photo diodes, LASER diodes and APDs. Users can also construct a student OTDR with the building blocks available as part of the OFS System A.

Complete in itself, this full laboratory configuration comprehensively covers the fibre optic lab work as per the syllabi of Anna University, JNTU and UP Technical University.

Topics covered by the OFS System A

• I. Characteristics of LED and PIN photo diodes
  • LED Characteristics
    • – P - I
    • – V - I
  • PD Characteristics
    • – Reverse Bias (responsivity, quantum efficiency)
    • – Forward Bias
    • – Zero Bias
    • – Leakage characteristics

• II. Characteristics of LASER diodes
  • LASER diode characteristics
    • – P - I (knee current)
    • – V - I
    • – Setting up of a LoS (Line of Sight) Link - Free space optical link
      •  With live data - using the Benchmark OFT
      •  Jamming of signal

• III. Characteristics of APD
  • APD characteristics
    • – Reverse Bias (multiplying effect)

• IV. Characteristics of multimode and single mode Fibres
  • Multimode plastic fibre
    • – Numerical aperture of plastic fibre
    • – Attenuation in plastic fibre
    • – Bending loss in plastic fibre
    • – Electromagnetic interference
    • – Pulse broadening in fibre optic communication
  • Multimode glass fibre
    • – Attenuation in multimode glass fibre
    • – Bending loss
    • – Clad-mode stripping study
  • Single mode Glass Fibre (Optional)
    • – Attenuation in glass fibre
    • – Bending loss
    • – Modes observation

• V. Fibre fault analysis using OTDR
  • Building blocks of OTDR - allows building an OTDR with essential components and studying its basic operations
  • Study of optical fibre events using the constructed OTDR and standard OTDR available in laboratories

• VI. Digital communication concepts used in serial transmissions
  • Study of 64Kbps transmission concept that is common in serial transmissions like ISDN/E1/T1 systems
  • Time division multiplexing concepts
  • Line coding methods (Manchester)
  • False marker generation and the role of ITU (CCITT) standard
  • PCM voice coding
  • Asynchronous data transfer

• VII. Fibre optic link design and analysis
  • Fibre Optic link design - analog and digital (plastic fibre)
  • Fibre Optic digital link
    • – Multimode fibre link - sensitivity and power budget
    • – Single mode fibre link - sensitivity and power budget (optional)
    • – Bit rate measurement and study of AC coupled link
  • Fibre optic analog link
    • – System study
    • – Bandwidth

Component List of the OFS System A

	Description/Component		Qty/Size
	OFT - Optical Fibre Trainer		1
	FOPS 101 (850nm) - Light Source		1
	FOPM 101 (Si) – Power Meter		1
	FOTR110 – 2MHz Plastic Fiber Analog Link		1
	FOTR300 – 2Mbps Multimode Glass Fibre Digital Link		1
	Fibre Events (Total 500m length)		1 set
	LED Module		1
	PD Module		1
	LD (Laser) Module		1
	APD Module		1
	OTDR Building Block		1 set
	FORX200 – 5Mbps Digital Receiver		1
	Loose Jacketed Multimode Glass Fibre		500m
	Special PCBs		18
	– Assembled		1 set
	– Unassembled		5 sets
	Manuals		1 set
	Accessories		1 set
	– ST-ST Patch Cords - multimode		1m x 3
	– ST-ST Reference Patch Cords Multimode		1m x 1
	– ST-ST 900micron Patch Cords Multimode		1m x 1
	– ST-ST Adaptors		2
	– LD Pointer		1
	– Microscope		1
	– Mandrels		1 set
	Optional Items:
	– 1550nm, LD Module		1
	– 1300nm, LED Module		1
	– FOPM 102 / PM2002 is required for the above options
	*Specifications subject to change without notice

Download the PDF

Download the OFS-A Power Point presentation