Control Systems & PLC's

Channel Multiplexer

Coarse Wavelength Division Multiplexer (1×2) Packed with Rich Features

Toronto, Canada – GAO Tek Inc. (www.GAOTek.com) has rolled out its coarse wavelength division multiplexer (CWDM) appropriate for use in WDM networks, telecommunications, cellular applications, fiber optic amplifiers and access networks. The multiplexer utilizes thin film coating technology and is characterized by low insertion loss, high channel isolation, wide passband, low sensitivity to temperature and an epoxy free optical path.

This coarse wavelength division multiplexer maximizes existing fiber optic infrastructure by transmitting multiple wavelength signals through the same fiber optic cable. It operates over a wavelength range of 1510 to 1610nm with 20nm channel spacing. The CWDM enables a dual fiber strand to support multiple network topologies and data rates to exponentially increase bandwidth capacity. It also enables immediate flexibility by increasing the capacity of existing fiber infrastructure, eliminating the need to lay new fiber at full capacity locations. This coarse wavelength division multiplexer is encapsulated within a non-flux metal bonding micro optic packaging and offers highly stable performance even in demanding environments.

Visit http://www.GAOTek.com for more information or to purchase this product online.

For any sales inquires please contact:

1-877 585-9555 ext. 601 – Toll Free (USA & Canada)

1-416 292-0038 ext. 601 – All Other Areas

sales@gaotek.com

About GAO Tek Inc.

GAO Tek Inc. (www.GAOTek.com) is a global leader in research, development and manufacturing of high performance telecommunication testers, electronic measurement instruments, embedded development tools and other electronic products that serve the needs of electronic professionals internationally.

 

Toronto, Canada – GAO Tek Inc. (www.GAOTek.com) has rolled out its coarse wavelength division multiplexer (CWDM) appropriate for use in WDM networks, telecommunications, cellular applications, fiber optic amplifiers and access networks. The multiplexer utilizes thin film coating technology and is characterized by low insertion loss, high channel isolation, wide passband, low sensitivity to temperature and an epoxy free optical path.

This coarse wavelength division multiplexer maximizes existing fiber optic infrastructure by transmitting multiple wavelength signals through the same fiber optic cable. It operates over a wavelength range of 1510 to 1610nm with 20nm channel spacing. The CWDM enables a dual fiber strand to support multiple network topologies and data rates to exponentially increase bandwidth capacity. It also enables immediate flexibility by increasing the capacity of existing fiber infrastructure, eliminating the need to lay new fiber at full capacity locations. This coarse wavelength division multiplexer is encapsulated within a non-flux metal bonding micro optic packaging and offers highly stable performance even in demanding environments.

Visit http://www.GAOTek.com for more information or to purchase this product online.

For any sales inquires please contact:

1-877 585-9555 ext. 601 – Toll Free (USA & Canada)

1-416 292-0038 ext. 601 – All Other Areas

sales@gaotek.com

About GAO Tek Inc.

GAO Tek Inc. (www.GAOTek.com) is a global leader in research, development and manufacturing of high performance telecommunication testers, electronic measurement instruments, embedded development tools and other electronic products that serve the needs of electronic professionals internationally.

About the Author

About GAO Tek Inc.

GAO Tek Inc. (www.GAOTek.com) is a global leader in research, development and manufacturing of high performance telecommunication testers, electronic measurement instruments, embedded development tools and other electronic products that serve the needs of electronic professionals internationally.

How to build a 8 bit wide data channel that only uses 4 data wires with counter, multiplexer and demultplexer?

i.e. the value on 8 switches are to appear on 8 LEDS but only 4 wires are to connect the two halves of the circuit (apart from power). The output may have less than 100% duty cycle. How to draw the circuit diagram?
By using:
74HC/HCT151 8-input multiplexer
74HC/HCT138 3-to-8 line decoder/demultiplexer; inverting
74HC/HCT161 Presettable synchronous 4-bit binary counter; asynchronous reset
Use a Mux-demux combination. The 4 wires are the select lines driven by a counter and a single data line. The output will have a very low duty cycle but it demonstrates the idea. Should have FF’s to ‘capture and hold’ the outputs between updates but this is a bit complicated and not required.

Do anyone knows how to draw a circuit diagram with the above details provided?

This needs some sort of clock to synchronise the multiplexer and demultiplexer. One approach is to use the serial data approach as in a UART which can transmit 8 bits of data. In this case the send and receive clocks are not transmitted, rather a start condition is used to synchronise the clocks during the data transfer, so this is called "asynchronous".

You say 4 data wires, but also only 4 wires. For parallel multiplexing, there needs to be additional control wires, like read nibble 1, read nibble 2 etc. I think it needs 6 wires, 4 data, one A/B (changeover switch select)and one common. As the control takes up one or two wires, there is only one left for data and one left for a common, so I think serial multiplexing is the way to go, which needs two wires (for one direction, and 3 wires for 2 directions).

You could use two uart chips, but these tend to have a microprocessor interface.

The basic concept of a UART is shown in the link below. A serial to parallel shift register can load received serial data until it is "full" by clocking in the center of the serial data bits. Then the data is read from the parallel outputs. The transmit end uses a parallel to serial shift register. An extra bit is used for start, and this restarts the receive clock so it is synchronised to the start bit. The clock has to have a counter for the number of bits.

As you have extra wires you can simplify it (compared to a UART) like the diagram "Outputs to LEDs from microprocessor" in the link. This needs 4 wires - serial data, serial clock, latch data and common. It is the receive side of your circuit. You need to work out the send side, using a parallel to serial shift register, a counter, a clock, and some logic to provide the latch pulse. It could just continuously cycle, or only when a start button is pressed or when data changes.. The next pages have more information including a bidirectional device (send or receive) using a universal shift register. This should get you started.

Edit later:
With those chips the method is still the same. The multiplexers and the counter and decoder chips serialise/deserialise the data. The 4 wires are still serial clock, serial data, latch pulse and common. The receive end needs to delay the clock and latch slightly in both cases.

Video Mux 16 Channel CCTV Multiplexer