(7) LD drive LED / ATT Mode (Option)
1. This LED indicates that current is injected into LD.
2. When this LED ickers, it shows that LD drive is in the mode not to feed back the uctua-
tion of optical output power. This is used when to tune low frequency modulation.
*Note : While this LED is lit, when the unit is operating in the ACC mode (refer to Section 16.
ACC mode key / RS-232C Delimiter Adjustment) the ATT mode (option) will be operated in
manual mode.
(8) LD drive key
This toggles ON/OFF the current to LD. When the power is supplied, current is not injected to
LD. Prior to shutting off the power source, be sure to shut off the injection current to LD. If the
power is shut off while current is supplied to LD, the LD may be damaged.
(9) Coherence control LED
This LED indicates that coherence control is carried out.
(10) Coherence control key
This toggles ON/OFF the coherence control to widen spectrum linewidth. When the coherence
control is ON, spectrum linewidth is widened.
(11) Shift LED
Pressing other key while this LED is lit changes wavelength calibration or GPIB address, and
switches the minimum digit setting and LD drive mode.
(12) Shift key
Pressing an optional key while the SHIFT LED is turned ON executes some other commands
as follows:
SHIFT + mW/dBm Key = wavelength calibration
SHIFT + WAVELENGTH/POWER Key = minimum digit setting
SHIFT + LOCAL Key = GP-IB address setting
(13) Fine tuning / Frequency Locking (Option) LED
1. This LED indicates that ne tuning control is being processed.
2. Illumination of the LED indicates that the frequency locking function has been activated.
(14) Fine tuning control key / RS-232C delimiter change
1. This toggles ON/OFF the ne tuning control to nely tune the wavelength. By setting con-
trol amount by the rotary encoder, ne tuning of wavelength in the range about ±0.02nm is
available.
2. When this key is pressed during power on, the delimiter of RS-232C may be changed.
(Refer to 9-2-A. Turning ON./Setting RS-232C Delimiter.)
(15) ACC mode LED
This LED lighting shows that this device is in ACC mode.
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