N-Bit, Lossless Variable Photonic Time Delay Module

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This N-bit (N ≥ 10) Photonic Time Delay Module selectively routes optical signals through N fiber segments with the different lengths. Each fiber segment is defined to have the delay as

Where dT is the increment of time delay.

Therefore, the module provides N-bit of digitally variable time delay, having the total time delay as

N and dT can be defined by customer.

The EDFAs is used in the module to compensate the optical loss through optic fiber segments and switches. The optical loss between the optic fiber segment and the bypassing path is balanced internally to get the excellent uniformity of optical power between different time delays in long time delay ranges.

High Resolution
High Speed
Large Time Delay Range
High Reliability
Low Insertion Loss
Low Power Consumption

True time delay evaluation
Instrumentation

N-bit Photonic Delay Module		Min	Typical	Max	Unit
Wavelength band		1535	1550	1565	nm
Insertion Loss ^[1]			0	0.5	dB
Cross Talk		25	30	40	dB
Switching Time	CL type		50	100	µs
Switching Time	NS type		150	300	ns
Repetition Rate ^[2]	CL type			2	kHz
Repetition Rate ^[2]	NS type			100	kHz
Delay Time Range ^[3]		0.05		TBD^[4]	ns
Polarization Dependent Loss			0.25	0.5	dB
IL Uniformity ^[5]			1.0	1.5	dB
Return Loss		50			dB
Operating Temperature		0		60	^oC
Optical Power Handling			0		dBm
Storage Temperature		-40		85	^oC
Fiber Type		SMF-28
Package Dimension ^[6]		19” mount rack

[1]: Defined at the input power from -10dBm to 0dBm [2]: Defined in each switch. [3]: The minimum delay can be as short as 0.01ns if needed, please contact us. [4]: The maximum delay is defined by the bit number and delay increment. [5]: Between the different time delays [6]: The height of 19” mount rack will be determined by the total time delay.